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TERRA NOSTRAN ÄTRA Schriften derder GeoUnionGeoUnionAIfred-Wegener-Stiftung Alfred-Wegener-Stiftung — – 2019/1 2019/1

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thLATIN- ‘ä\\\\\\_ ”1’434? AMERICAN COLLOQUIUM

HAMBURG . SEPT18—21 - 2019

Celebrating the 250th birthday of Alexander von Humboldt

255thth Latin-AmericanLatin-American ColloquiumColloquium ofof GeosciencesGeosciences Hamburg,Hamburg, GermanyGermany September 1818 -- 21,21,2019 2019

ProgramProgram andand Abstracts

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t n: n Universität Hamburg _ _ _ __ DER FORSCHUNG | DER LEHRE | DER BILDUNG EditedEd|ted by UlrichUlrlCh RillerRlller & PaulPaUI GöllnerGollner 2 PROGRAMPROG RAM

TERRA NOSTRANOSTRA —– Schriften derder GeoUnionGeoUnion Alfred-Wegener-StiftungAlfred-Wegener-Stiftung

PublisherPubﬁsher VerlagVerlag ä ä =

-:-.i Ü 0 . . GeoUnion Alfred—Wegener—Stiftung

GeoUnion Alfred-Wegener-StiftungAlfred-Wegener-Stittung c/o Universität Potsdam,Potsdam, InstitutInstitut fürfür Erd-Erd- undund UmweltwissenschaftenUmweltwissenschaften Karl-Liebknecht-Str. 24-25, Haus 27, 1447614476 Potsdam,Potsdam, Germany Tel.: +49 (0)331-977-5789, Fax: +49 (0)331-977-5700 E-Mail:E-IVIail: [email protected]

EditorialEditorial officeofﬁce Dr. Christof Ellger Schriftleitung GeoUnion Alfred-Wegener-StiftungAlfred-Wegener-Stittung c/o Universität Potsdam,Potsdam, InstitutInstitut fürfür Erd-Erd- undund UmweltwissenschaftenUmweltwissenschaften Karl-Liebknecht-Str. 24-25, Haus 27, 1447614476 Potsdam,Potsdam, Germany Tel.: +49 (0)331-977-5789, Fax: +49 (0)331-977-5700 E-Mail:E-IVIail: [email protected]

Vol.VO|. 2019/1 2525thth Latin-American ColloquiumColloquium ofof GeosciencesGeosciences HeftHEﬂ' 2019/12019/1 Program and Abstracts

EditorsEditors Ulrich Riller & Paul Göllner InstitutInstitut fürfür GeologieGeologie Universität Hamburg Bundesstraße 55 20146 Hamburg,Hamburg, Germany

PrintedPfihtEd byby Universitätsdruckerei Hamburg,Hamburg, Allende-Platz 1, 20146 HamburgHamburg Druck

Copyright and responsibility for the scientificscientiﬁc content contentof ofthe thecontributions contributionsare arewith withthe theauthors. authors. Copyright und VerantwortungVerantwortung fürfür den wissenschaftlichen InhaltInhalt derder BeiträgeBeiträge liegenliegen beibei dendenAutoren. Autoren.

ISSNISSN 0946-8978

GeoUnion Alfred-Wegener-StiftungAlfred-Wegener-Stittung — –Potsdam, Potsdam,September September2019 2019 PROGRAMPROG RAM 3

LACLAC 2019

2525thth Latin-AmericanLatin-American ColloquiumColloquium ofof GeosciencesGeosciences ProgramProgram and Abstracts

UniversitätUniversität Hamburg,Hamburg, Germany September 1818 —– 21,21, 20192019

Abstracts in this volume may be cited as:

Author A. B. (2019) Title of abstract. In 25th Latin-American ColloquiumColloquium ofof Geosciences,Geosciences, RiIIerRiller U.U. && GÖII-Göll- ner, P. (ed.),(ed.)‚ p. XX. TERRA NOSTRA - Schriften derder GeoUnionGeoUnion AIfred-Wegener-Stiftung;Alfred-Wegener-Stiftung;2019,1. 2019,1.ISSN ISSN 0946-8978. 4 PROGRAMPROG RAM PROGRAMPROG RAM 5

ScientificScientiﬁc committee committee

Prof.Prof. Dr.Dr. Jan Behrmann (Geomar Kiel)Kiel)

Prof.Prof. Dr.Dr. Simone KasemannKasemann (Marum Bremen)Bremen)

Prof.Prof. Dr.Dr. Heidrun Kopp (Geomar Kiel)Kiel)

Dr.Dr. DietrichDietrich LangeLange (Geomar Kiel)Kiel)

Prof.Prof. Dr.Dr. Ulrich RillerRilIer (Universität Hamburg)Hamburg)

Dr.Dr. MatthiasMatthias RosenauRosenau (GFZ(GFZ Potsdam)Potsdam)

Prof.Prof. Dr.Dr. Magdalena Scheck-Wenderoth (GFZ Potsdam)Potsdam)

Prof.Prof. Dr.Dr. Gerhard Schmiedl (Universität Hamburg)Hamburg)

Prof.Prof. Dr.Dr. Manfred Strecker (Universität Potsdam)Potsdam)

Prof.Prof. Dr.Dr. BodoBodo Weber (CICESE Ensenada,Ensenada, Mexico)Mexico) 6 PROGRAMPROG RAM

Welcome to the 25th Latin-American Colloquium of Geosciences!

Collaborative researchresearch inin thethe GeosciencesGeosciences betweenbetween GermanGerman andand Latin-AmericanLatin-Americanscientists scientistshas hasa a longIong tradition inin Germany.Germany. BasedBased onon thisthis traditiontraditionand andefforts effortsto todisseminate disseminateresearch researchresults resultsand and to foster collaboration, thethe Latin-AmericanLatin-AmericanColloquium Colloquium(LAC) (LAC)was wasestablished establishedin in1972. 1972.Over Overthe the years, the LACLAC has advanced as an important international venuevenue toto showcaseshowcase projectsprojects supportedsupported by the German Science Foundation, thethe GermanGerman AcademicAcademic ExchangeExchange Service,Service, thethe AlexanderAlexander vonvon HumboldtHumboldt Foundation,Foundation, Germany’sGermany’s FederalFederal IVIinistryMinistry ofof ScienceScience andand Technology,Technology, andand otherother fundingfunding bodies. ManyIVIany of the featured collaborative projectsprojects areare highlyhighly interdisciplinaryinterdisciplinary andand spanspan fromfrom ma-ma- rinerine geology and geophysics, structural geology, paleontology, mineralogy, sedimentology to papa-- leoclimateleoclimate studies, geomorphology and the impactimpact of humankind on erosion and climate change. Given the challenges that geoscientists areare confrontedconfronted withwith today,today, thisthis EarthEarth SystemSystem ScienceScience for-format of the conference is timely andand helpshelps fomentfoment interdisciplinaryinterdisciplinary thinkingthinking andand thethe establishmentestablishment of new alliances.aIIiances. As such, the LAC follows the EarthEarth System Science approach of Alexander von HumboldtHumboldt and his efforts toto communicatecommunicate scientiscientificﬁc results resultsto tothe thepublic. public.

InIn the tradition ofof thethe holisticholisticapproach approachof ofAlexander Alexandervon vonHumboldt Humboldtin inapproaching approachingcomplex complexre- -re search problems, the LACLAC will celebrate transdisciplinary milestones achieved through German- LatinLatin AmericanAmerican cooperationcooperationin inthe thegeosciences. geosciences.It Itwill willalso alsohighlight highlightthe theresults resultsof ofindividual individualre- -re search projects and identify futurefuture avenuesavenues ofof cooperation.cooperation.The Thefollowing followingtopics topicswill willbe becentral centralto to the LAC:

- Ocean-continent transition,transition, - Continental growthgrowth andand modimodification,ﬁcation, - Earth-surfaceEarth-surface processes and their climatic andand tectonictectonic forcings.forcings.

The main topics of the LACLAC will be complemented by contributions regardingregarding methodologicalmethodological andand technical advances, collection-basedcoIlection-based andand paleo-environmentalpaleo-environmental research,research, andand resourceresource formation.formation. The scientificscientiﬁc goal goalof ofthe theLAC LACis isat atthe theheart heartof ofa adeeper deeperunderstanding understandingofthe of theinteractions interactionsbetween between solid earth, atmosphere, hydrosphere, and biosphere with a focus on LatinLatin America.America. TheThe forcingforcing factors governing the Earth’sEarth's systems also involveinvolve the interactioninteraction withwith humankind.humankind. InIn thisthis regard,regard, the modern EarthEarth System Science approach featured at the LACLAC follows von Humboldt’sHumboldt’s approach by substitutingisolated isolatedresearch researchefforts effortswith witha conferencea conferenceformat formatthat thatfosters fostersa systemica systemicanalysis analysis of the Earth’sEarth's systems. Indeed,Indeed, already in the early 18th18th century Alexander von HumboldtHumboldt recogrecog-- nized the importance of understanding the role of different geoprocessesgeoprocesses onon thethe environmentenvironment andand human habitats and vice versa. InIn this context, understanding the behaviour of the System EarthEarth on geological and shorter time scalesscales remainsremains anan everever importantimportant topictopic inin thethe geosciencesgeosciences andand isis the very objective ofof thethe GeosciencesGeosciences atat thethe UniversitätUniversität Hamburg.Hamburg. FollowingFollowing thethe 15th15th LACLAC heldheld atat the Universität HamburgHamburg in 1996,1996, the Universität isis prepared to host the 25th LACLAC from September 1818 —– 21, 2019.

UlrichUlrich RillerRiller & LACLAC 2019 ScientificScientiﬁc Committee Committee PROGRAMPROG RAM 7

Table of Contents

The Venue ...... 8

Presentation formatsformats ...... 10

ScientificScientiﬁc Program Program...... 10

OrOralal sessions ...... 1212

PPosteroster sessions ...... 16

InvitedInvited keynote speakers ...... 20

Travel grant recipients ...... 20

Evening lectureIecture ...... 21

Conference dinner on the Rickmer Rickmers ...... 22

Field trips and guided museum tours ...... 23

Sponsors ...... 27

Abstracts ...... 28

Author index ...... 98

TERRA NOSTRA published volumes ...... 104...... 104 8 PROGRAMPROG RAM

The venue

Gettingto tothe thevenue venue

You may plan your trip using the HamburgHamburg public transport website www.geofox.hvv.de.

From the airport

Take the S-Bahn lineIine S1Sl to the station ”Ohlsdorf”“Ohlsdorf” andand changechange t0to thethe U-BahnU-Bahn Iineline U1U1 towardstowards ”Farm-“Farm- sen”.sen". At the station ”Kellinghusenstraße”,“Kellinghusenstraße”, changechange t0to U-BahnU-Bahn Iineline U3U3 towardstowards ”Hauptbahnhof“Hauptbahnhof SüdSüd —– Wandsbek-Gartenstadt“Wandsbek-Gartenstadt” and exit at station ”Schlump".“Schlump”. Then,Then, followfollow onon footfoot thethe streetsstreets “Beim“Beim Schlump”Schlump" and “Bundesstraße””Bundesstraße" for about 400 m until youyou reachreach thethe Geomatikum.Geomatikum.

By train

After arrivingarriving atat thethe mainmain traintrain stationstation(”Hauptbahnhof"), (“Hauptbahnhof”),you youmay mayuse usethe theU-Bahn U-BahnIine lineU2 U2towards towards “Niendorf”Niendorf Nord”Nord" or the U-BahnU-Bahn lineIine U3 towards “Barmbek”Barmbek —– Wandsbek-Gartenstadt”, and exit at station “Schlump".“Schlump”. Then,Then, followfollow onon footfoot thethe streetsstreets ”Beim“Beim Schlump"Schlump” andand ”Bundesstraße”“Bundesstraße” forfor aboutabout 400 m until youyou reachreach thethe Geomatikum.Geomatikum.

By car

UsingUsing the car is not advisable as there is non0 designated parking area for visitors of the GeomatiGeomati-- kum, and public parking space in the vicinity of the building is rather limited.Iimited.

The conference will be held at the Geomatikum andand thethe GeologicalGeological andand PaleontologicalPaleontological MuseumMuseum of the Universität HamburgHamburg (Bundesstraße 55, 20146 Hamburg,Hamburg, Germany). Oral presentations areare delivered in lectureIecture hallshaIIs H1,H1, H2H2 and H3.H3. The evening lectureIecture on September 1919 will be held in lectureIecture hallhaII H1.H1. PostersPosters are presented inin the MuseumIVIuseum of Geology and Paleontology. LunchLunch isis availavail-- able at the MensaMensa in the Geomatikum (payment(payment inin cashcash only),only), whichwhich offersoffersa avegetarian vegetariandish dishand and a salad bar besides regular meals, or at restaurants on the nearby Grindelallee and BeimBeim Schlump (see(see map).

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Presentation formats

KeynoteKeynote oral presentations areare 3030 minutesminutes Ionglong andand standardstandard talkstalks areare 2020 minutesminutes Iong.long. TheThe dura-dura- tion ofof bothboth shouldshould Ieaveleave 55 minutesminutes forfor questions,questions,discussion discussionand andchange-over change-overto tothe thenext nextspeaker. speaker. PresentersPresenters of oral presentations areare kindlykindly askedasked toto ensureensure thatthat theirtheir presentationspresentationsare areuploaded uploaded on the computer in the front of the respective Iecturelecture haIIhall weIIwell inin advanceadvance toto thethe beginningbeginning ofof thethe respectiverespective sessionsession block,block, whichwhich thethe presentationspresentationsare arescheduled scheduledfor. for.A AIecture lectureroom roomassistant assistantwill will help uploading the presentations. WeWe acceptaccept PowerPointPowerPoint ﬁlesfilesand andPDFs. PDFs.Please Pleaserefrain refrainfrom fromusing using your own laptopIaptop for oral presentations.

InIn order to provide ample roomroom for discussion of poster presentations, thethe postersposters willwill bebe dis-displayed in two groups, one on September 1919 (day 1) and the other on September 20 (day 2). EachEach day, a two-hour longIong poster session will be held in the afternoon. PleasePlease referrefer toto thethe posterposter sessionsession program to identify thethe dayday youryour posterposter shouldshould bebe onon display.display. TheThe programprogram alsoalso indicatesindicates thethe num-numbers of the poster boards the posters are assigned to. PosterPoster format is A0 portrait (vertical). TheThe scientificscientiﬁc and andvisual visualquality qualityof ofyoung youngscientist’s scientist’sposters posterswiII willbe beassessed assessedby bya committeea committeeand andthere there will be three poster awards bestowed at the conference dinner.

Scientific Program

September 18, 2019 05:00 p.m. to 09:00 p.m.: RegistrationRegistration andand icebrakericebraker receptionreceptionat atthe theGeomatikum Geomatikum

September 19, 2019 08:30 a.m. —– 09:15 a.m.: Welcome address 09:20 a.m. —– 10:30 a.m.: Oral sessions in lectureIecture halls H2,H2, H3H3 and H4 10:3010:30 a.m. —– 11:00 a.m.: CoffeeCof'fee breakbreak 11:0011:00 a.m. —– 12:30 p.m.: Oral sessions in lectureIecture halls H2, H3H3 and H4H4 12:3012:30 p.m. —– 01:30 p.m.: Lunch break 01:30 p.m. —– 03:20 p.m.: Oral sessions in lectureIecture halls H2H2 and H4H4 03:20 p.m. —– 05:30 p.m.: Poster session in the Museum 05:30 p.m. —– 06:30 p.m.: Public evening lectureIecture in LectureLecture hallhaII H1H1

September 20, 2019 08:30 a.m. —– 10:00 a.m.: Oral sessions in lectureIecture halls H2,H2, H3H3 and H4 10:0010:00 a.m. —– 10:30 a.m.: CoffeeCof'fee breakbreak 10:3010:30 a.m. —– 12:00 a.m.: Oral sessions in lectureIecture halls H2,H2, H3H3 and H4 12:0012:00 a.m. —01:30– 01:30 p.m.: LunchLunch break 01:30 p.m. —– 03:30 p.m.: Oral sessions in lectureIecture halls H2H2 and H4H4 03:30 p.m. —– 05:30 p.m.: Poster session in the Museum 05:30 p.m. —– 06:00 p.m.: Concluding remarks in lectureIecture hallhaII H2H2 06:00 p.m. —– 07:00 p.m.: BreakBreak and transfer to the St. Pauli LandungsbrückenLandungsbrücken 07:00 p.m. —– 10:0010:00 p.m.: Conference dinner on the Rickmer Rickmers

September 21, 2019 Geological fieldﬁeld tripstrips undund museummuseum tourstours PROGRAMPROG RAM 1111

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Poster sessions day 1, Thursday 19.09.2019, 15:20h - 17:30h

Fester haard Subductinn tone seismntectnnics and earthquake dynamics IP©€ numher 1 FuIl-Waueferm Inversinn fer Seismic Velnciw and Mrament Tenser Selutiens beneath Herth Chile Y. Gan, F. Tilmann, D.-P. van Herwaarden, 5. Thrastarsnn, A. Fichtner

Hupture rzlirer:t'ii.rit\ir and stress drop estimalion at the Nnrthern Chilean su bduttion zone .l. Fuleskv, .I. Rakau, J. Kummemw, S. A. Shapim

Seismic structure and tectonics nf the nnrth Chilean cnnvergent margin hetween 1995 and 2195 using multichannel seisrnir: reflect'inn data F. Gunzalez, E. Contreras, A. Trehu, E. Vera

Electrical structure of the Andean nrngenic crust in Nerthern Chile at 1TB using magnetntelluric data F. Reves Cürdmra, D. Diaz Alvarado, K. Slezak

Seismic Processing Strategv and Crustal Structure ef the April 1, EÜIA Mw 3.2 Rupture Area Üﬁshnre Northern Chile from Seismic Reﬂectien Data B. Ma, D. Kläschen, H. Kapp, A. Trehu

Marine fürearc structure cf the 2014 Mw 3.1 iquique earthquaI-ze reuealed bar hypocemer Incations from offshore observations F. Petersen, D. Lange, l. Grevemeyer, H. Kopp, E. Contreras-Heves, 5. Barrientus

Kinemah‘cs ef subd uction prDCESSE'S during the earthqua ice tyrtle in Central Chile lt. Bataille, L. Aguirre, C. Novaa, C. Pei‘ia, F. Vera

Subduction kinematics in the years before and after the EUIA, Iquique Mw 8.1 Earthquake, Chile from de—noised GPS trajectories and jnint sliph strain models J. Bedford, Z. Deng, M. Moreno, D. Lange, B. Schurr, H. Satt:-

Probing the Northern Chile megathrust with seismicitv —The EDIA MS.1lquique earthquake sequence H. Soto, C. Sippl, B. Schurr. J. Kummerow, G. Asch, F. Tilmann, D. Cnmte, 5. Ruiz, D. Dncken

Crustal euelutien nif ancient crustal terranes

1D P—T-d path of a garnet-hearing metagranite früm the Palenprnterüaüic basement cf theTandilia terrane, Rio de la Plata craton, Argentina M. Angeletti, J. C. Martinez, M. C. Frisicaie, H.—J. Massnnne

11 Thermüchronologv of the Säo Francisco Craton and Araguai-Ribeira Dregenir: System Transition A. D. Chaves, L. G. Knauer, A. W. Romane, B. A. Aleman Manteire, A. L. Kimenes, C. E. Vieira, G. B. Vergas, C. Lana, M. Silva, A. R. Allrirnin

12 The lglesias Complex in the Merida Andes 1ii‘enezr.le|'ar A recerd of Cambrian-Silurian continental arc and Permo-Triassic Pangea amalgamatien in western Gondwana M. D. Tazzo, B. Weber, A. Schmitt, R. GDnIäIeE—Guzma’n, M- 1ilalenrfla, D- Frei, P. Schaaf, L. Solari

Unlcaniem and tectnnics

13 Tortonian trachyrte volcanae in the Alta Sierra de Snmün Cura Maltanic Cnmplex. Northern Extrandean. Patagonia. Argentina M. Remesal, M. E. Cerreclo. J. M. Albite, F. Salani, C. Parica

15i Somün Cura Magmatic Province {Argentina}. Laua—pyrnclastii: sequente snuthern of Ei Cain village: Age and compositiori F. Salani, M. Remesal, M. E. Cerredo, C. Parica

15 2D medelling ni magnetii: anomaly Tona an the Argentina cantinental margin A. C. Pedraxa De Marchi, M. E. Ghidella, J. R. Franzese

15 Geothermal systems exploration in the snuthern Chilean unlcanir: Inne bv magnetotelluric method M. PHVEI, E. Schill, S. Held, D- Diaz, T. Kohl

1? Advances in B isotnpe analysis nf silicate rücks — applications in an: settings [Chile] A. Paul, L. A. Kirstein, I. Saum, C. de Hang, T. Ellintt, 5. J. Turner, 5. Agnstini

13 Investigation nf fractal dimensinns of impact-induced cataclasite er the Chicaulub impact crater based nn an imprnved semi-autnmatic image segmentatien workﬂnw using SAGA GIS 5. Köiln, D. CnnratL Ll. Riller

15 Tracing the vülcanic and tectonic efiects Df t’ne Miecene Andean stage alcing the Fatagnnian retrnarc: an example Df the HiD Negrc: system, Argentina L. D'Elia, A. Eiilmes, M. Lüpez, .i. Elucher, M. Gartia, Fi. Fen,.l. Cuitiﬁü,.l. H. Franzese PROGRAMPROG RAM 1717

Poster sessions day 1, Thursday 19.09.2019, 15:20h - 17:30h

2D Dynamit interach‘on ofthe initial impact melt sheet during peak-ring farrnation of the Chicxulub Impact Crater, mexim F. Schulte, U. Riller

21 Miocene volcaniclastic foreland basin inﬁll next to the exhurned North Patagonien Andean betholith: a record of collapse‘caidera eruptions? M. Lopez, J. Bucher, M. Garcia, L. D‘Elia, A. Biimes, .I. Franzese

22 Holocene ﬂank-eruptions at the Lanin Volcano {Southern ‘u'olcanic Eonel, Patagonia C. Balbis, I. A. Petrinovic, J. A. Brod

23 Geodynamic importance of the spatial distribuh’on of monogenetic uolcanic centers in the Southern Andes between 39°S and 3?°5 'l". Lee, P. Göliner, U. Riller

Ocean, sediment, and climate dynamics

25l A Iate QUBtEI’naI'V paleoecoiogical record frorn Lake Peten ltaa, Guaternala'. eﬁects of abrupt ciimate change on aquatic and terrestrial communities in the lowland northern Neotropics L. Perez, n. Correa-Metrio. 5. Cohuo, L. Macario-Gonaalez, M. Brenner, 5. Hut‘terolf, M. Stockhecke, A. Schwaib

25 Basin evolution, lake establishment and orhital scale clirnatir: uariahiliw: the ca. SÜD ica sedimentaw record of Lake Chalcn, central Maxico B. Ürtege, R. Martinez, L. Romero, D. Auendai‘io, S. Lozano, M. Caballero, E. Brown, B. Valero, M. Stockhecke, P. Fawcett, J. Werne, L. Perez, A. Schwall)

2E Tracking changes in weathering inﬂux into late Ediacaran marine sustems using lithiurn isotopes in carbonate rocks: An example frorn the Corurnha Group, Brazii G. Paula-Santos, S. Kasemann, A. Meixner, 5. Caetanailho, Fl. Trindade, K. Amorim, J. Enzweiler

2? Heconstrucring past climatii: changes using lacustrine sedirnents frorn Laguna Comedero, NW Argentina P.Vignoni, R. Tjaliingii, F. lCc'irizloba, Ei. Plessen, G. Torres, L. Lupo, A. Brauer

2E Palaeoenuironmental changes ouer the last millennia in the subtropical forests of Northwest Argentina inferred from fossil pollen records G. Torres, L. Lupo, P. Vignoni, F. Cördoba, A. Brauer

29 Water table and biotic effects on Precambrian aeolian depositional sustems in Brazil and India G. Basilici, F. R. Abrantes Junior, M. V. Soares Theodoro, A. Cardoso Hibeiro, R. vasconez Garcia

3D Future offshore research activities in Northern Chile using au SONNE H. Kopp, D. Lange

31 Strontium isotope dating of evaporites and the brealrup of the Guif of Mexico and Proto-Caribbean seawavs B. Weber, J. Pindell, S. PadiIIa-Ramire2

Geophusics

32 GPR supported sampling for environmental purposes. Examples from te Rio Säo Francisco marginal lagoons, Minas Gerais, Braail H. A. Horn, P. A. Aranha, w. Trindade, A. Magalhäes

33 Urban micro-gravity: study of irregularities in the hasement of Queretaro ein.r [Maxicol and subsidence risks U. Yutsis, J. A. Arzate Flores, D. A. Veläsquez, A. Dias de Leon, D. E. Torres, M. Espinosa

3d: Towards ViSualizarion Possihie Fluid Pathwaus Using L'Sraiii‘ii,r in the Los Hurneros and AtoCulco Geothermal Fieids N. Corneio, E. Schiil. S. Held, J. Carriilo, M. Pere: 1818 PROGRAMPROG RAM

Poster SESSlOI‘iS day 2, Friday 20.09.2019, 15:30h - 17:30h

Fester n

hna rd Deformation, climate, and ernsinn in the Andes - I iRATEGy im} ‚.«f numher 1 The Peleezeic Claromece Basin {Argentina}: 3D Iithespheric seale density medel 5. E. Vaaquez Lucern. C. Prezti, M. 5check-Wenderoth, J- Bett, M- L. Genie: DacaL H. 1wirren, F. l. Ballestrini

Tectenic and clirnatic eeupled precesses in Nerth Patagonien Andes: Mietene oregraphic harrier upiift and rain shadnw generatien J. Buchen A. Bilmes, L. D'Ella‚ M. Löpez, M. Garcia, A. Varela, J. Franzese

GNSS—based remnte sensing: Innovative Observatinn of key hydrnlngical parameters in the Central Andes N. Antannglou, B. Benkhagen, J. Wickert, A. Güntner, A. de laTerre

The rnle ef mass wasting in glacial ferelands ef the Andes E. Schönfeldt 0. Korup, D. Winnwn T. Panek

Approaching the organic carbon balance: Interactinn of climate, tectonics. Erosion and biota in riverine carbün transpert and respiratinn at the Bermeje Riuer 5. Dosen, N. Hmius, D. Sachse

New insights abeut Seuth American hydreclimate changes during Heinrich Stadials M.E. Campus. C. M. Chiessi. M. Prange, S. Mulitza, H. Kuhnert. A. Paul, I. M. Venanciü. A. L. S. Albuquerque, F. W. Cruz, A. Eahr

The Mincene füreland basins of Northern Patagnnia: sediment transfer systems from the Seuthern Andean t0 the Atlantic shelf A. Bilmes, L. D'Elia‚ J. Cuitir’io, J. Buchen M. Löpez, M. Garcia, R. Feo, J. Franzese

Testing Inng—term controls of sedimentarv basin architecture in the broken foreland II — Modelling the spatial uariabiiityr of the strata M.\.-'allati‚ M. Mutti. G. Winterleitner

insights an the Eate Cenozoic evolution of the Rio Grande foreland basin in South Mendoza province, Argentina R. Feal. M. Ghiglione, Fi. Ündrak, M. Strecken F. Tapia, L. Giambiagi

10' Stratigraphic architecture in earlv stages of intermontane basin: the Miocene Calchaqui foreland, NW Argentina C. E. ﬁel Papa, P. Pawola, F. Hongn, H. Pingel, M. De Campo, A. Lapiana, M. R. Strecker

11 Kineman’callv heterogenenus faulting in the conﬁguration of Neogene Patagonien foreland basins: acrivation nf pre-existing fabrics and strain partitioning M. Garcia, M. Lupe; J. Sucher, L- D'Elia, A. Bilrnes, J. Franzese

12 .üilnng-strike crustal strength gradient accounts for the GPS velocity field in the Southern Andes: euidence frem scaled analügue experiments J. Ü. Eisermann, P. L. Göllner, U. Riller

13 The nature ef the North-Süuth change ef the magnitude of tectonic shertening in Central Andes at Altiplane-Puna latitudes: a therrnernechanical mndeling appmach P. Michaei, 5. Sebalev, S. Liu

14 insights an the lithnspheric densitv structure of the Southern Central Andes and their foreland C. Redrigue: Piceda, M- Seheck—Wenderoth, M. L. Gomez Dacal, J. Bett, C. Prezzi, M. Strecker

15 Late Pleistecene t0 Recent shortening rates in the broken foreland ef NW Argentina: New obseruatiens frern the intermentane Cafayrate Ualleg, 26" 5 Iat. S. Figuema, J. WElES, F. Hengn, L. Elias. L. Escalante, G. Aranda, M. R. Strecker

16 Illuaharnal'llr defermatinn at the Lerma Valley, NDrthwestern Argentina L. i. Elias. E. Montero Lupe; E. J. Criadü 5utti, V. H. Garcia, F. Hengn, F. Krüger, M. Strecker

1? Exhumatien histery ef the Argentine eastern cerdillera at 23"s A. T. Lapiana, E. Sehe-l, C. del Papa, C. MenterewLüpeL S. Zapata

13 Nentectnnics nf the Andean Plateau lPunaJ G. Lauer-Dünlteiherg PROGRAMPROG RAM 1919

Poster sessions day 2,. Friday 20.09.2019, 15:30h — 17:30h

Naturai resources ‘ -=-’

15 Multi-physics Inversion of Gravity and Magnetic Data in Los Humeros Super Hot Geotherrnal System. Niexico J. Earrillo Lopez, M. A. Perez—Fiores, E. Schill

2D Lithium sources in northern Puna salars, Argentina. Evidence from ti and Sr isotope compositions E. Sarchi, A. Meixner, F. Lucassen, P. J. Caffe, R. Becchio. S. A. Kasemann

21 Constraining the magmatic-hydrothermal fluid euolution from proximal to distal settings by ﬂuid inclusion and isotopic analyses of ore and gangue minerals and numerical modelling M. 5teltnow, V. Lüders, P. Weis‚ R. L. Romer

22 Water chemistrv in Somün Cura region, Rio Negro and Chubut Provinces. Argentina C. Parica. M. Hemesal

23 Isotopic {Nd-Sr-Fbi signature of the diamictitic iron formations from the Neoproterozoic Macaubas Group, Araguai orogenr 5E Brazil F. Vilela, A. C. Pedrosa Soares. F. Lucassen. S. Kasemann

2d. Fluid inclusion and stable isotope geochemistry of rare-metal pegmatites, Sierra Grande de San Luis. Argentina A. van den Herkhof, G. Sosa, V. Liiders. T. Montenegro

25 LCT and NYF pegmatites as an indicator for the magrnatic evolution ofthe Las Chacras Bathoiith, central Argentina E. FtibackL U. Altenberger. R. Trumbull. M. Lopea de Luchi

25 First qualitative obseruations and interpretation of ﬁuid and melt inclusions frorn Capoeirana and Nova Era emerald deposits. Minas Gerais, Brazil I. Pintea, H. A. Horn

2? Presence of critical metals {St and REE} in Iaterites from ophiolitic Moa—Baracoa complex. Cuba- An inuesﬁment opportunity for EU? G. ÜrOIEO, A. Carballo, J. N. Muﬁoz

Üther topics 23 Metal accumulation in surface sediment of the urban and industrial coastal area ofthe munitipalitrlr of Moa [Cubak distribu’n‘on and poliution assessment ‘l". Cervantes Guerra, H.-J. GursI-w, A. Rodriguez, A. Pierra

25 Darn Collapse: the case of Brumadinho — 2019 (Brumadinho, Minas Gerais — Brazil] J. DIiueira, P. W. Üliueira

3D The new binational Argentinian-German master's program "Applied Geothermics“ {San JuanfBochum] S. Wohnlich. N. Mendoza, J. Schrauen A. Banning, C. G. Fernande:‚ M. A. Pittaluga

31 Geologic recognition ofthe Eocene Los Corros fossiliferous Ievel {Esmeraldas formation, middle Magdalena valle'yr. Colombia] L. J. Drdoﬁe:‚ G. D. Patarrovo Camargo

32 Analysis of diversiﬁcation histories in extinct carnivorous rnarsupials {Sparassodonta‚ Metatheria} using a Bayesian frarneworic 5. Tarquini, 5. Ladeveaa F. Prevosh' 20 PROGRAMPROG RAM

Invited keynote speakers

Prof.Prof. Dr. Wilson Teixeira (Universidade de SãoSäo Paulo,Paulo, Brazil)Brazil) Prof.Prof. Dr. Gabriel GonzálezGonzalez (Universidad CatólicaCatolica del Norte,Norte, Antofagasta, Chile) Prof.Prof. Dr. Sergio EduardoEduardo BarrientosBarrientos (Universidad de Chile, Santiago, Chile)Chile) Prof.Prof. Dr. Anne TréhuTre’hu (Oregon State University, USA) Prof.Prof. Dr. EduardoEduardo E.E. Contreras-Reyes (Universidad de Chile, Santiago, Chile)Chile) Prof.Prof. Dr. LauraLaura Giambiagi (CONICET, Mendoza,IVIendoza, Argentina) Dr.Dr. Stefanie Tofelde (Institut fürfür Geoökologie,Geoökologie, UniversitätUniversität Potsdam)Potsdam) Prof.Prof. Dr. Giorgio BasiliciBasilici (State University of Campinas, Brazil)Brazil) Prof.Prof. Dr. IvanIvan PetrinovicPetrinovic (CICTERRA Córdoba,Cordoba, Argentina) Prof.Prof. Dr. ErnestoErnesto Cristallini (Universidad de BuenosBuenos Aires, Argentina) Prof.Prof. Dr. RobertoRoberto S. Molina-GarzaIVIoIina-Garza (UNAM,(UNAIVI, MexicoIVIeXico City, Mexico)IVIexico) Prof.Prof. Dr. Cristiano IVIazurMazur ChiessiChiessi (Universidad(Universidad dede SaoSao Paulo,Paulo, Brazil)Brazil) Prof.Prof. Dr. Gregory Hoke (Syracuse University, USA)

Travel grant recipients

BrunoBruno Augusto AlemãoAlemäo MonteiroIVIonteiro (Universidade FederalFederal de MinasIVIinas Gerais, Brazil)Brazil) MarcusMarcus ViníciusVinI'cius Theodoro Soares (State University of Campinas, Brazil)Brazil) MaríliaMarilia C. Campos (Universidade de SãoSäo Paulo, Brazil)Brazil) German DavidDavid PatarroyoPatarroyo (Universidad IndustrialIndustrial de Santander, Colombia) FelipeFelipe Gonzalez RojasRojas (Universidad de Chile, Santiago, Chile)Chile) CristiánCristian EduardoEduardo SiegelSiegel IgnatiewIgnatiew(Universidad (Universidadde deChile, Chile,Santiago, Santiago,Chile) Chile) FelipeFelipe ReyesReyes CórdovaCordova (Universidad de Chile, Santiago, Chile)Chile) Dr.Dr. AndrésAndre’s BilmesBilmes (CENPAT-CONICET, Puerto Madryn,IVIadryn, Argentina) Lic.Lic. Sergio DanielDaniel Tarquini (CONICET, Mendoza,IVIendoza, Argentina) EricEric MarderwaldIVIarderwald (CONICET, National UniversityUniversity ofof LaLa Plata,Plata, Argentina)Argentina) Dr.Dr. MaríaMaria Clara LambertiLamberti (University(University ofof BuenosBuenos Aires,Aires, Argentina)Argentina) Lic.Lic. Carisa Sarchi (INECOA-CONICET, S.S. de Jujuy, Argentina) Dr.Dr. IreneIrene R.R. HernandoHernando (CONICET, NationalNational UniversityUniversity ofof LaLa Plata,Plata, Argentina)Argentina) MatiasMatias RomeroRomero (CICTERRA,(CICTERRA, Cordoba,Cordoba, Argentina)Argentina) ManuelIVIanuel LópezLopez (CONICET, NationalNational UniversityUniversity ofof LaLa Plata,Plata, Argentina)Argentina) Dr.Dr. JoaquínJoaquI'n BucherBucher (CONICET, NationalNational UniversityUniversity ofof LaLa Plata,Plata, Argentina)Argentina) VíctorVictor RuizRuiz GonzálezGonzalez (CONICET, University of BuenosBuenos Aires, Argentina) MicaelaIVIicaela GarcíaGarcia (National UniversityUniversity ofof LaLa Plata,Plata, Argentina)Argentina) Thalia Anaid AvilésAviles EsquivelEsquivel (Ensenada, Mexico)IVIexico) PROGRAMPROG RAM 21

Evening lecture (September 19, 2019 at 5:30 p.m.)

IntoInto Amazonia: the history of the Amazon River and rainforest

Prof.Prof. Dr. Carina HoornHoorn (University of Amsterdam)

InIn this presentation II hopehope t0to taketake youyou withwith meme onon aajourney journey thatthat startedstarted inin 19881988 wentwent II ﬁrstfirstvisited visited the Amazon rainforest.rainforest. MyMy mission was to document the Tertiary atat whicheverwhichever outcropsoutcrops II couldcould findﬁnd andand performperform palynologicalpalynological analysisanalysis ofof samplessamples t0to getanget an insightinsight intointo thethe historyhistory ofof thethe rainfor-rainforest. MyIVIy research started at Araracuara (Caquetá(Caqueta Province,Province, Colombia), which means ‘home’home of the macaws’,macaws', however, this site also had a dark history, as it was a former penal colony for the most dangerous criminals from Colombia. Araracuara is situated along the CaquetáCaqueta River,River, which cuts across PaleozoicPaleozoic and NeogeneNeogene formations. TheThe latterlatterturned turnedout outt0 tobe bea akey keyt0 tothe thepuzzle puzzleof ofhow how the history of the Amazon and itsits rainforestrainforest unfolded. II will also introduce you to some of the rere-- search sites in PeruPeru and Brazil,Brazil, and even extend to the deep waters at the mouth of the Amazon, which forms part of my more recent research. The data collected and the collaboration withwith manymany great colleagues made it possible tot0 lift aa tiptipof ofthe theveil veiland anddiscover discoversome someof ofthe thehistory historyof ofthe the Amazon. This story is still unfoldingunfolding andand futurefuture workwork cancan generategenerate moremore knowledgeknowledge onon thisthis endan-endan- gered ecosystem.

4....; II'J Il' III. wtq-rggwu r- 22 PROGRAMPROG RAM

Conference dinner on the Rickmer Rickmers (September 20, 2019 at 7 p.m.)

The conference dinner of the 25th Latin-AmericanLatin-American ColloquiumColloquium ofof GeoscienceGeoscience isis sponsoredsponsored byby Win-Win- tershall DeaDea DeutschlandDeutschland AG and will be held on the Rickmer RickmersRickmers,, a three-masted cargo sailing ship built in 18961896 and at anchor in the PortPort of Hamburg since 1983 (https://www.rickmer-rickmers. de/). The 97 m longIong and 12.212.2 m wide vessel now serves as a museum ship and conveys the highly eventful historyhistory oftheof theRickmer Rickmers as a freight sailing ship and marine training vessel. ForFor the delegates of the conference it might be of interest to know that the vessel transported nitre from Chile in the early 20th century.

The conference dinner will start with a reception atat 77 p.m.p.m. onon thethe upperupper deckdeck ofof thethe vessel.vessel. TheThe buffet willwill bebe servedserved inin thethe vessels’vessels’ hulk,hulk, whichwhich hashas beenbeen restoredrestored neatlyneatly toto aa restaurantrestaurant includingincluding a bar. DuringDuring their stay on board the Rickmer RickmersRickmers,, delegates will have fullfuII access to the exhiexhi-- bitions onon thethe museummuseum decks.decks.

BecauseBecause of steep staircases, access to the Rickmer Rickmers isis not recommendedrecommended for disabled persons with strongly reduced mobility. There is no wheelchair access. PleasePlease wear name tag for access to the Rickmer RickmersRickmers..

... ‘.' ‘ _- 1 '- 5': -‘ ü - " . ‚'. . ' .__. -. "-.5.-?'.r-.*-- - ‚i'll... .h“.' - - P—- i '. _ . „..i . ' I '. ' l I 2g: ' ‚I II|

_ __ l 3:? E: . . ‚ .4. - . . .-v'‚„-„.‚.;_-_‘A 'wun' _ | E E l-l i '| " A l. m}; 1‘ p-mxfﬂu -i. . ___

| .m | s ' _ - .. ‚5| l. 5-. _ I “i v d „M . . ä. - ’ «um: ‘i’ l' "r 'a__._ i.- ' —..„ .J' |-' ' - PROGRAMPROG RAM 23

Field trips and guided museum tours (September 21, 2019)

FieldField trip 1:1: PalaeoseismicPalaeoseismic and karstkarst structures in Quaternary sediments of HamburgHamburg and Schleswig-Holstein

FieldField trip leaders:Ieaders: Dr.Dr. Alf Grube (State Geological Survey of Hamburg,Hamburg, Germany) Dr.Dr. NilsNils BuurmanBuurman (Wintershall DEADEA DeutscheDeutsche ErdoelErdoel AG)

DelegatesDelegates will meet on September 21 at 9:00 a.m. in front of the Geomatikum andand willwill traveltravel byby bus. DelegatesDelegates will receive a lunchIunch pack. HikingHiking boots and, depending on weather, waterproofwaterpromc and warm clothing is recommended.

The fieldfield triptrip Willwill showcaseshowcase unprecedentedunprecedented structuralstructural evidenceevidence forfor moderate-moderate- toto Iarge-magnitude,large-magnitude, prehistoric seismic events in the metropolitan HamburgHamburg and nearby Schleswig-Holstein regions (Grube(Grube 2018, 2019). The events may be relatedrelated to the activationof ofinherited inheritedregional regionalfaults, faults,inin- cluding graben and horst structures, notably of the central Glückstadt Graben. The events may have been triggered by glacial loading and unloading and associated isostatic adjustmentadjustment ofof upperupper crust. DependingDepending on outcrop conditions, delegatesdelegates willwill witnesswitness faultsfaults intersectingintersectingthe theEarth's Earth’ssur- sur- face, blowout clastic dykes,dykes, ininfillfill structures, structures,seismic seismicSSDS, SSDS,seismoslumps, seismoslumps,and andother othersoft-sediment soft-sediment deformation structuresstructures inin SaalianSaalian glacioglaciofluvialfluvial and andWeichselian Weichselianperiglacial periglacialmaterial. material.Salt Saltstructures structures that have bulged to the earth’searth's surface of North Germany are important for a wide rangerange of asas-- pects of applied geosciences. Sinkholes related to Permian rocks are widespread in HamburgHamburg and surrounding areas (Buurman, 2010). KarstificationKarstification may maycause causesevere severedamage damageto toexisting existinginfrastruc- infrastruc- ture inin a densely populated area as Hamburg.Hamburg. The excursion presents impressiveimpressive sinkholes and introducesintroduces investigationinvestigation methods methodsused usedto tode definefine areas areasmost mostprone proneto toground groundfailure failureand andresulting resulting sinkhole development.

Buurman, N.,N.‚ 2010. Charakterisierung von Zirkularstrukturen im geologischen Untergrund Hamburgs zur Abgrenzung verkarstungsgefährdeter Bereiche. —– Ph.D. thesis, Univ. Hamburg: 224 p.

Grube, A.,A.‚ 2018. Palaeoseismic structures in Quaternary sediments, related to an assumed fault zone north of the Permian Peissen-Gnutz salt structure (NW Germany) —– Neotectonic activity andand earthquakesearthquakes fromfrom thethe SaalianSaalian toto the Holocene. Geomorphology 328, 15–27.15—27.

Grube, A.,A.‚ 2019. Palaeoseismic structures in Quaternary sediments of Hamburg (NW Germany), earthquake evievi-- dence during the younger Weichselian and Holocene. International JournalJournal ofof EarthEarth Sciences,Sciences, 1-17.1-17.

“l 24 PROGRAMPROG RAM

FieldField trip 2: Geology of the southern NorthNorth Sea and HeligolandHeligoland

FieldField trip leader:Ieader: FranzFranz Binot (formerly at LeibnizLeibniz InstituteInstitute forfor AppliedApplied Geophysics,Geophysics, Hannover,Hannover, Germany)Germany)

DelegatesDelegates will meet on September 21 at 8:45 a.m. at St. PauliPauli Landungsbrücken,Landungsbrücken, BrückeBrücke 3/4 at the catamaran (Halunder Jet of Helgolines)Helgolines) in the PortPort of Hamburg.Hamburg. ToT0 get to the St. PauliPauli LandungsLandungs-- brücken from the Geomatikum, taketake thethe SubwaySubway Iineline U3U3 atat stationstation”Schlump" “Schlump”towards towards“Haupt- “Haupt- bahnhof Süd —– Wandsbek-Gartenstadt“ and exit after threethree stopsstops atat thethe stationstation”St. “St.Pauli". Pauli”.From From there, walk for about 500 m down the Helgoländer Allee to the Landungsbrücken and lookIook for the catamaran (Halunder Jet of Helgolines).Helgolines).

DelegatesDelegates will receive a lunchIunch pack and will then traveltraveI with the catamaran to the south port of Heligoland.Heligoland. The trip with the catamaran starts at 9 a.m.,a.m.‚ takes a bit lessIess than 4 hours one way. This will leaveIeave about 4 hours to explore the geology of HeligolandHeligoland on foot. Arrival back in HamburgHamburg is scheduled for 8:15 p.m.. Hiking boots and, depending on weather, water- and windproofWindproof as wellweII as warm clothing is recommended.

MesozoicIVIesozoic rocks of the NorthNorth Sea BasinBasin rise above sea levelIeveI in one place only in the German NorthNorth Sea, which is on the islands of Heligoland.Heligoland. DueDue to uplift causedcaused byby aa IVIioceneMiocene saItsalt pillow,pillow, thethe deeperdeeper levelsIeveIs of the Southern North Sea BasinBasin strata are excellentlyexceIIentIy exposed on Heligoland.Heligoland. Accordingly, the geological program ofofthe the visit willWill focus on the cliffs inin TriassicTriassic rocksrocks displayingdisplaying structural,structural, halo-halo- kinetic, sedimentological,sedimentological, erosionalerosional andand metallogeneticmetallogeneticfeatures. features.IVIoreover, Moreover,ﬁeld fieldtrip tripparticipants participants will witness the outcome of the construction andand dramaticdramaticdestruction destructionofthe of theisland islanddue dueto tohuman human activities,in inparticular particularduring duringWorld WorldWar WarII, II,which whichremodelled remodelledthe thenaturaI naturalshape shapeof ofHeligoland. Heligoland. PROGRAMPROG RAM 25

FieldField trip 3: UNESCOUNESCO World HeritageHeritage Wadden Sea

FieldField trip leaders:Ieaders: Prof.Prof. Dr.Dr. Gerhard Schmiedl (Universität Hamburg)Hamburg) Dr.Dr. UlrichUlrich Kotthoff(Universität (UniversitätHamburg) Hamburg)

DelegatesDelegates willWill meet on September 21 at 6:00 a.m. (!)(l) in front of the Geomatikum andand willwill traveltravel inin a van to the lighthouseIighthouse of Westerhever (1.5 to 2 hours). DelegatesDelegates will receive a lunchIunch pack.

InIn 2009, the unique Wadden Sea was inscribedinscribed on the listlist of the UNESCO World Heritage. This one-day fieldfield triptrip willwill Ieadlead toto thethe WaddenWadden SeaSea NationalNationalPark Parkto toexplore explorethe thesedimentology sedimentologyand and actuo-paleontology of the intertidal zonezone oftheof the southeasternsoutheastern partpart ofof thethe NorthNorth Sea.Sea. AtAt lowlow tidetidewe we will study the sedimentological processes and features of a typical tidal flat,flat,including includingripple ripplemarks, marks, channels, mud areas and sand bars. We will discuss the impact and interaction ofof thethe relevantrelevant environmental parameters, such as climate, hydrology and availability of sediment on sediment dynamics and coastal evolution. InIn addition,addition,we weWill willexplore explorethe theecosystems ecosystemsof ofsaIt saltmarshes marshesand and tidal flatsflatswith witha aparticular particularfocus focuson onactuo-paleontological actuo-paleontologicalaspects aspectsincluding includingIife lifestrategy, strategy,ichnofa- ichnofa- cies, and taphonomy. On our way from HamburgHamburg to Westerhever we pass the typical North GerGer-- man landscapesIandscapes of marshes and moraines, which were formed by Quaternary glacial advances and sea-level fluctuations,fluctuations, and andwhich whichwere weresubsequently subsequentlyreshaped reshapedby byanthropogenic anthropogenicactivities activitieslike likeIand land reclamation.reclamation.

Our firstﬁrst stopstop willwill Ieadlead usus onon aa round-tripround-trip throughthrough thethe polder,polder, saltsalt marshes,marshes, andand tidaltidalﬂats flatsof ofthe the “Westerhever Sand”Sand" in the vicinity of the picturesque lighthouse of Westerhever (built in 1906).1906). On our way back to Hamburg, we will visit the NationalNational ParkPark CenterCenter IVIultimarMultimarWattforum Wattforumin Tön-in Tön- ning where we can learnIearn more about the Wadden Sea and various North Sea ecosystems.

RecommendedRecommended equipment: The fieldfield triptrip willwill includeinclude aa severalseveral kilometerkilometer walkwalk onon thethe tidaltidalflat, flat,inin- cluding muddy and shallow water areas. RainwearRainwear and protection againstagainst Windwind andand sunsun areare recom-recommended. InIn addition, fixablefixablesport sportshoes shoesor orrubber rubberboots bootsare arerecommended recommendedfor forprotection protectionagainst against cuts from bivalve shells. 26 PROGRAMPROG RAM

Guided tour 1:1: HumboldtHumboldt exhibition atat thethe ZoologicalZoological InstituteInstitute

Delegates,Delegates, who registered to this tour, will meet the tour guide, Dr.Dr. MarcMarc Theodor, in the GeologiGeologi-- cal and Paleontological Museum (Geomatikum, BundesstraßeBundesstraße 55).55). AfterAftera abrief briefintroduction introductionto tothis this museum, Dr. Marc Theodor will walk with you to the Zoological Museum.

Tour guide: Dr.Dr. MarcMarc Theodor

Tour start: 1010 a.m.

DurationDuration ofof thethe tour:tour: approximatelyapproximately 1.51.5 hourshours

MaximumMaximum number of participants: 2020

Guided tour 2: LokiLoki Schmidt HausHaus of the BotanicBotanic Garden HamburgHamburg

Delegates,Delegates, who registered for this tour, will meet at the entrance of the BotanicBotanic Garden of the UniUni-- versität Hamburg.Hamburg. To get to the BotanicBotanic Garden from the Geomatikum, walkwalk toto thethe U-BahnU-Bahn stationstation “Schlump”,”Schlump", take the U2U2 to the station ”Jungfernstieg"“Jungfernstieg”(3 (3stops), stops),there theretransfer transferto tothe theS-Bahn S-BahnIine line and take the S1 to the station KleinKlein FlottbekFlottbek(8 (8stops). stops).Meet Meetthe thetour tourguide, guide,Janine JaninePeikert, Peikert,at atthe the entrance of the BotanicBotanic Garden.

Join the German natural scientist AlexanderAlexander vonvon HumboldtHumboldt (1769(1769 -- 1859)1859) onon hishis expeditionexpeditioninto into nature. Take the perspective ofof thethe explorerexplorer andand hishis understandingunderstanding ofof nature,nature, inin whichwhich everythingeverything isis connected. The exhibition „Botany„Botany inin motion”motion“shows showshow howHumboldt’s Humboldt´sway wayof ofcollecting collectingand andreg- -reg isteringistering plants has changed the understanding of our environment.

Tour guide: Janine PeikertPeikert

Tour start: 2 p.m.

DurationDuration ofof thethe tour:tour: approximatelyapproximately 1.51.5 hourshours

MaximumMaximum number of participants: 2020 PROGRAMPROG RAM 27

Sponsors of the 25th Latin-American Colloquium of Geosciences

H Universität Hamburg DER FORSCHUNG I DER LEHRE I DER BILDUNG

DF Deutsche Fürschungsgemeinschaft QM!-

wintershnll den IPCDGJ‘"

„Q; .Ei' 5'. "JE". GeoUnion Alfred -WEgE:r‘|er-Stiftung

{nATEGy 28 ABSTRACTS

The Tandilia Terrane (TT), in central-easterncentraI-eastern Argentina Abstracts and southeastern Uruguay (Pamoukaghlian et al., 2017) isis a Paleoproterozoic igneous-metamorphicigneous-metamorphic complex where the southernmost portions ofof thethe RioRio dede lala PIataPlata craton are exposed. The study area includes small outout-- crops of garnet-bearing metagranite at the La Virgen ImpactsImpacts of climate and humans on vegetation hill,hiIl, western TT. To constrain the P-T-dP-T—d evolution ofof thisthis inin northeastern Brazil during the lateIate rock,rock, we considered microstructures and a P-T pseudopseudo-- Holocene section contouredcontoured withwith chemicalchemical parametersparameters ofof interest.interest. This pseudosection waswas constructedconstructed withwith thethe PERPLE_XPERPLE_X 1 1 C. Alves de MoraesMoraesl,, H. BehlingBehlingl,, M. Accioly Teixeira de software for for a aselected selectedbq-rock bulk-rockcomposition compositionin the in the 1 OliveiraOliveira1 11-component system Si-Ti-Al-Fe-Mn-Mg-Ca-Na-K-O-H.Si-Ti-Al-Fe—IVIn-IVIg-Ca-Na-K-O-H. 1 1Georg-August-UniversitätGeorg-August-Universität Göttingen,Department Departmentof ofPalynology Palynologyand and The analyzed rock is a slightly deformed, peraluminous Climate Dynamics, Goettingen,Germany Germany (ASI=(ASI= 1.07), grey granite composed of (~(N vol.%): K-feldK-feld-- The Holocene is a key period for understanding the roleroIe spar (Kfs, 37), quartz (Qtz, 30), plagioclase (Pl,(PI, 18),18), biobio-- of climate change and the human impacts on the envienvi-- tite (Bt,(Bt, 7),7), garnetgarnet (Grt,(Grt, 5),5), muscovitemuscovite (Ms,(Ms, 2),2), andand zircon,zircon, ronment.ronment. These changes are probably the main drivers apatite, monazite, monazite,ilmenite ilmenite(IIm), (Ilm),and andmagnetite magnetite(Ma) (Ma) of forest-related vicariance and patterns of ofgenetic geneticdi- di- as accessory phases (1). The porphyroclastic texture texture is is versity in the tropics. Vegetation changeschanges areare goodgood indi-indi- characterized by 1515 vol.% of a fine-grainedfine-grained (20-100(20-100 mm)mm) granoblastic matrix. cators of climate change/and or human impacts. InIn this granoblastic matrix. context, a sediment core was collected using the RusRus-- The derived P-T path is based on garnet zoning. The sian Sampler in a swampy area in the CatimbaúCatimbau NationalNational garnet core composition pyr4(gro+andr)125pe510alm74,pyr4(gro+andr)12spes10alm74, which equilibrated with andesine (XAn = 0.37), yielded Park, State of Pernambuco, Northeast Brazil. Although which equilibrated with andesine (XAn = 0.37), yielded the studied regionregion isis locatedIocated inin the semiarid conditions P-T conditions ofof 66 kbarkbar andand 650°C650°C (Fig.(Fig. 1,1, pointpoint A)A) aboveabove of Caatinga, thethe coringcoring sitesite isis inin aa particularparticulararea areaprovid- provid- the solidus (~7(“7 vol.% of melt). The stable assemblage at inging moist conditions inin thethe Holocene.Holocene. TheThe collectedcollected corecore these conditions isis Ms+PI+Kfs+IIm+IVIa+Grt+Bt+Qtz+meIMs+Pl+Kfs+Ilm+Ma+Grt+Bt+Qtz+mel isis 420 cm longIong and a basal age of around 2.800 calcaI yrs B.P. t, as in the natural rock.rock. Garnet recordedrecorded a rimwardrimward dede-- The core was studied by pollen, spores, and sedimentary creased in pyrope from 4 to 3 mol% by slow cation dif-dif- characteristics asas weIlwell asas dateddated byby AMSAMS radiocarbonradiocarbon dat-dat- fusion to itsits stability limitIimit which isis reachedreached at 5.5 kbar and 620°C (Fig. 1, point B). The subsequent path is con- ing.ing. The resultsresults allow distinguishing threethree differentdifferentperi- peri- and 620°C (Fig. 1, point B). The subsequent path is con- ods. The firstfirst periodperiod isis characterizedcharacterized byby thethe dominancedominance strained by metamorphic muscovite with Si contents of of Cecropia, indicative ofof strongstrong disturbances,disturbances, suggest-suggest- 3.09-3.17 Si perperformula formula unit and XAn= 0.36 in plagioclase. 1.0 __ inging relativelyrelatively drydry conditionsconditionsuntil until2.160 2.160cal calyrs yrsB.P. B.P.In Inthe the f ICH IrI G1 "3.:: following period, the site isis representedrepresented mainly by arboarbo-- fl ‚XML: II': €31 I. fl IIII'IIIn In GI realreal vegetation, indicatingindicatinga atransition transitionto towetter wettercondi- condi- ÜBE„„ tions, betweenbetween 2.1602.160 andand 450450 caIcal yrsyrs B.P.B.P. TheThe lastlast periodperiod du - — Ehe-cluutui P-T |:I::Ih isis marked by the presence of more open vegetation asas consequent of a return to drier conditions, afterafter450 450cal cal Ü.E4_q yrs B.P. Along the core is also possible to recognize the presence of Orbignya palm pollen, what also indicates the presence of human“shuman”s disturbance in the area during Üdß__ the latelate Holocene.

0.23.1

P-t-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of i I I I i I TI°CI the Tandilia terrane, Rio de La Plata craton, 450 520 EEÜ EEÜ T30 SÜD Argentina The deciphered P-T path in the studied rock demondemon-- M. AngelettiAngelettil,1, J. C. MartínezIVIartI’ne21,2,1,2, M. C. FrisicaleFrisicale1,2,1,2, H. J. strates the cooling of granitic material materialat atnear nearsolidus solidus MassonneIVIassonne3,43,4 conditions and andthe theexhumation exhumationfrom fromthe middle the middlecrust crust 11UniversidadUniversidad Nacional del Sur, Geología,Geologia, BahíaBahI’a Blanca, Argentina (22(22 km), under an apparent geotherm of ~"’ 30 ºCkm-1,9Ckm-1, 22Conicet,Conicet, Ingeosur, BahíaBahia Blanca, Argentina to upper crustal depths of ~7“7 km. The ductile micro- micro- 3 3UniversitätUniversität Stuttgart, FakultätFakultät Chemie,Chemie, Stuttgart,Stuttgart,Germany Germany structures of deformation inin thethe protomyloniticprotomyloniticgranite granite 44ChinaChina University of Geosciences, School of Earth Sciences, Wuhan, China are consistent with microstructures in feldspars (defor(defor-- mation twins,twins, myrmekites,myrmekites, andand ﬂameflameperthites) perthites)from froma a 1.5 km distant granitic rockrock ofof thethe SiempreSiempre AmigosAmigos areaarea ABSTRACTS 29

| ' 3' which were restricted between 650º6509 and 430º4309 C (Ange(Ange-- . .r .‚t‘‚_T... v.‚'_ ' ä-x-H- .. - _ _ ' ‘b. :_ "E: . e' .31“ -.1T_'.-f - n - ' '-".„1 i. I-IF -. . "'13“- In? ﬁl“ UE lettiIetti et etal., al.,2016). 2016).The Theexhumation exhumationpath pathsuggested suggestedfor forthe the r äp of Salta - I'.’ 'u ? l.- | 'l'l ' . 5_ '.‚5?ﬁ5"alta University GI! ‚ a ; ‚r ‚ _. ‚_ I k :' Ii-Ig- n .‚ ‚in .‚ H 1.. studied metagranite is similar to that of the garnet-beargarnet-bear-- "a .. _ -.' -. -.„__ h. 'n. u." ._ . o asia- inging postcollisional leucograniteIeucogranite of San Veran hill, asigned „. - " ‘v ‘

- ' 'i "b" . 5

to Trans-Amazonian orogeny cycle (Martínez(Martinez etet aI.al. 2017).2017). . i

GNSS-based remote sensing: Innovative observation ofof keykey hydrologicalhydrological parametersparameters inin the Central Andes Reference N. AntonoglouAntonogloul,1, B. BookhagenBookhagenl,1, J. WickertWickert2‚2, A. GüntnerGüntner3,3, Wadge, G.,G.‚ Francis, P.W.,P.W.‚ Ramírez,RamI’rez, C.F. 1995. The Socompa collapse A. de IaTorre44 A. de laTorre and avalanche event. Journal of Volcanology and Geothermal ReRe-- 11PotsdamPotsdam University, Institute ofof Geosciences,Geosciences, Potsdam,Potsdam, GermanyGermany search 66(1): 309-336. 22GFZGFZ Potsdam, Space Geodetic Techniques,Techniques, Potsdam,Potsdam, GermanyGermany 33GFZGFZ Potsdam, Hydrology, Potsdam, Germany 44UniversidadUniversidad Austral, Ingenieria, Buenos Aires, Argentina Mapping marine geothermal resources with The Central Andes are characterized by a steep climatic and environmental gradient with large spatial andand tem-tem- the magnetotelluric method in the northern poral variations of ofassociated associatedhydrological hydrologicalparameters. parameters. Gulf of California In this region, important hydrological components are In this region, important hydrological components are T. A. Avilés-EsquivelAviles-Esquivell,1, C. Flores-LunaFIores-Lunal,1, V. Reyes-OrtegaReyes-Ortegaz,2, integrated water vapor (IWV) and soil moisture. Both integrated water vapor (IWV) and soil moisture. Both E. Gómez-TreviñoGomez-Trevi'riol,1, S. ConstableConstablez,2, G. AntonioAntonio11 parameters can be monitored in parallel by using Global 11CICESE,CICESE, Earth Science, ENSENADA, Mexico Navigation Satellite SatelliteSystem System- -Re Reflectometryflectometry (GNSS-R) (GNSS-R) 22ScrippsScripps Institution of ofOceanography, Oceanography,Earth EarthScience, Science,La LaJolla, Jolla,United United techniques. States As part of the International ResearchResearch TrainingTraining Group-Group- StRATEGy project, this research aims at monitoring IWV Different geological geological and andgeophysical geophysicaldisciplines disciplineshave have and soil moisture with new station datadata inin thethe CentralCentral suggested the Wagner Basin as a promising locationIocation ofof Andes. According to the needs ofofthe the research, four indeinde-- geothermal resources. As a reconnaissance tool MagMag-- pendent GNSS ground stations werewere installedinstalled forfor thethe col-col- netotelluric (MT) data were measured at 10 sites along lectionIection ofof thethe data.data. EachEach stationstationwill willbe beIocated locatedin indiffer- differ- with a profileprofile overover thisthis basinbasin inin thethe northernnorthern GulfGulf ofof Cali-Cali- ent altitude alongalong thethe climaticclimaticgradient gradientand andwill willcontain contain fornia. The subsurface distribution ofof electricalelectrical resistivityresistivity various quality GNSS receivers. Itlt has been shown that was estimated withwith two-dimensionaltwo-dimensional smoothsmooth inversioninversion some high-quality receivers provide precise measuremeasure-- using the apparent resistivities and andphases phasesfrom fromboth both ments, while low-qualityIow-quality receivers have not been widely fieldfield polarizations.polarizations.We Wealso alsofound founda adeep deepconductor conductorun- un- tested for these applications. AA goalgoal ofof thisthis projectproject isis thethe derneath the center of the basin, interpreted as a zone direct comparison of data quality from each site and rere-- of partial meltmelt feedingfeeding thethe accretionaccretionzone zoneof ofthis thisyoung young ceiver type. Additionally, soil soilmoisture moisturesensors sensorswill willbe be crustal spreading zone. From six MT sites with close-by installedinstalled at each site. This set-up will help to evaluate heat flowflow measurements,measurements, wewe alsoalso foundfound aa positivepositivecor- cor- the quality of the GNSS receivers.receivers. Moreover, the GNSS- relationrelation between betweenthe theinterpreted interpretedshallow shallow(first (first100 m) 100 m) based remote sensing approaches will be directly comcom-- resistivitiesresistivities and andhigh highheat heatflows. flows.This Thisshows showsthat thatthe theMT MT pared to traditional Time-Domain Time-DomainRe Reflectometryflectometry (TDR) (TDR) method can be used to map submarine heat sources. We techniques for calibration andand evaluation.evaluation.On-site On-sitemete- mete- also found a deep conductor underneath the center of orological stations willwill bebe usedused forfor studyingstudying thethe relationrelation the basin, interpretedinterpreted as a zone of partial meltmelt feedingfeeding between the magnitude of precipitation eventsevents andand soilsoil the accretion zonezone ofof thisthis youngyoung crustalcrustal spreadingspreading zone.zone. moisture as well as the time neededneeded toto spotspot aa signisignificantficant change in soil moisture after aa precipitationprecipitationevent. event. Holocene flank-eruptionsflank—eruptions at atthe theLanin Lanín Station Altitude (m)(m) Volcano (Southern Volcanic Zone), Patagonia University of Salta 1150 1 1 2 Tolombon 1700 C. BalbisBalbisl,, I.l. A. PetrinovicPetrinovicl,, J. A. BrodBrod2 1 Payogasta 2500 1CONICET,CONICET, CICTERRA, CÓRDOBA,CÖRDOBA, Argentina 22UniversidadeUniversidade Federal de Goiânia,Goiania, Goiania, Germany Pozuelos 3800 The LanínLanin (39° 38.34‘S/71°38.34’5/71° 30.16‘W)30.16’W) is considered an acac-- tive volcanovolcano andand isis Iocatedlocated inin thethe CentralCentral SouthSouth VolcanicVolcanic Zone (CSVZ) being part of the Villarrica-Quetrupillán-Villarrica-Quetrupillan- 30 ABSTRACTS

LanínLanin volcanic chain (VQLVC). The latterIatter comprisescomprises threethree 128 Global Navigation Satellite SatelliteSystems Systems(GNSS) (GNSS)sta- - sta Pleistocene-HolocenePIeistocene-Holocene composite volcanoes, aligned in a tions, 40 40of ofthem themwith withon-line on-linereal time realpositioning time positioningat at NW-SE direction, andand moremore thanthan 2020 monogeneticmonogeneticvolca- volca- the site (RTX),(RTX), and 297 strong motion instrumentsinstruments -de--de- noes of similar age. signed for engineering purposes-purposes— complement the real Five eruptive unitsunits withwith postglacialpostglacial ageage (less(less thanthan ca.ca. time network.network. 14000 years) are recognized on the LanínLanin volcano flanks.flanks. The network was designed to provide fast and acac-- Through a facies analysis, the conduits and nature of curate estimates of ofearthquake earthquakesource sourceparameters parameters-of -of these eruptions areare determined.determined. InIn thisthis way,way, vulcanian/vulcanian/ potentially devastatingdevastatingearthquakes- earthquakes-for foremergency emergencyre- -re subPliniansubPIinian eruptions areare interpretedinterpreted withwith thethe develop-develop- sponse applications, withwith thethe capabilitycapability toto comprehen-comprehen- ment of considerable eruptive columns, columns, followed followed by by sive characterization ofof ChileanChilean seismicity,seismicity, necessarynecessary forfor strombolian eruptions inin thethe mostmost significantsignificantcases. cases.Vul- Vul- long-termlong-term hazard assessment and mitigationactivities. activities.In In canian eruptions producedproduced pyroclasticpyroclasticcurrents currentsand andfall fall real-timereal-time applications, applications,as aswell wellas in asthe innear thefield, nearthe field, the deposits with different transporttransport conditionsconditionsthat thataffected affected GNSS stations becomebecome criticalcriticalfor fordetermination determinationof offault fault the N and SE flanksflanks ofof thethe volcano,volcano, atat ca.ca. 1000010000 years.years. finiteness ofof MM ∼ 77 oror largerlarger earthquakesearthquakes thatthat affectaffectthe the Through chemical analysis of different eruptiveeruptivecycle”s cycle“s coastal part of the country. We will present recent develdevel-- rocks,rocks, the consanguinity of the involvedinvolved magma in the opments in rapid earthquake characterization, includinrg>including eruptive cycle cycleis isdetermined, determined,derived derivedfrom froma singular a singular implementationimplementation of ofW-Phase W-Phasemethodology methodologyto estimate to estimate magmatic systemsystem inin evolution.evolution.The Thecomparison comparisonof ofchemi- chemi- moment magnitude as wellweII as fault geometry using as cal analyses with those available from the QuetrupillánQuetrupillan examples the observations mademade forfor largelarge earthquakesearthquakes and Villarrica volcanoes, similar evolutionary histories histories inin the country: from the M8.2, April 1,1, 2014 event to the are interpreted in the magmatic reservoirsreservoirs ofof eacheach vol-vol- M6.9,IVI6.9, April 24, 2017 earthquake. cano. That is, basaltic magma magmarecharges rechargesin inmagmatic magmatic Additionally, thethe networknetwork presentlypresently coverscovers regionsregions notnot chambers dominated by fractional crystallization.crystallization. monitored previously in a continuous manner mannerat atthis this scale, particularly inin australaustral Chile,Chile, andand cIearclear patternspatternsof of seismicity are emergingemerginrg> after fourfour yearsyears ofof operationsoperationsin in these areas. As for current developments, a prototype of an inteinte-- grated accelerometer device has been designed and tested for its deployment in Central Chile as part of an Earthquake Early Warning System.

Upper Cretaceous palaeosols as basin analysis proxies: Bauru group (SE Brazil) and Los Llanos formation (NW(NW Argentina)Argentina) G. BasiliciBasilicil,1, M. V. Soares Theodoro 11,, F. R. Abrantes JúniorJüniorl,1, A. Cardoso Ribeiro 1 11IG/UNICAIVIP,IG/UNICAMP, CAMPINAS, Brazil Present status and future plans for the Chilean Seismic Network The palaeosols constitute powerfulpowerful palaeoenvironmen-palaeoenvironmen- taltaI and stratigraphic proxies,proxies, becausebecause duringduring theirtheir devel-devel- 1 S. Barrientos ParrasParras1 and the CSN Team opment they record climate, biology, parent material, 11CSNCSN Centro SismológicoSismolögico Nacional Universidad de Chile, Facultad de time, sedimentationsedimentationrate rateand andtopography. topography.In Inthis thisrespect, respect, Ciencias FíscasFiscas y Matemáticas,Matematicas, SantiagoSantiagode deChile, Chile,Chile Chile palaeosols are useful tools to define thethe palaeoenviron-palaeoenvironmental conditions and andto tounravel unravelthe thealternation alternationbe- be- The National SeismologicalSeismological CenterCenter (CSN)(CSN) ofof thethe Univer-Univer- tween sedimentation and andtopographic topographicstability, stability,thus thus sity of Chile is currently operating aa networknetwork ofof overover 8080 giving fruitful informationinformationon ontype typeand andfrequency frequencyof ofthe the real-timereal-time multiparametric multiparametric(BB (BBand andstronxg> strongground groundmo- mo- sedimentary processes. The palaeosols are very common tion) stationsstationsdistributed distributedall allover overthe thecountry, country,including including inin Cretaceous South America continental sedimentary sedimentary two Paciﬁc islands. Of these, 10 stations were installed two Pacific islands. Of these, 10 stations were installed successions. under a program with IRIS within two years after the the Using fieldﬁeld andand laboratoriallaboratorial methodsmethods forfaciesfor facies analysesanalyses 2010 Maule earthquake. The main bulk of station in- -in and palaeopedological studies, this paper demonstrates stallations tooktook placeplace withinwithin fourfour yearsyears afterafter2012. 2012.This This how palaeosols can give useful insights on causes, charchar-- network is complemented by stations ofof thethe IntegratedIntegrated acteristics andand periodicityperiodicity ofof thethe sedimentarysedimentary processesprocesses Plate Observatory Chile (IPOC) in northern Chile, three Plate Observatory Chile (IPOC) in northern Chile, three inin two Upper Cretaceous South America sedimentary Global Seismographic Network (GSN) stations and andtwo two successions: the LosLos Llanos Formation and andthe theBauru Bauru Geoscope stations. Geoscope stations. Group. ABSTRACTS 31

The Los LlanosLIanos Formation isis aa sandstonesandstone unit,unit, depos-depos- bilised by biotic effectseffects(Venkatpur (VenkatpurSandstone SandstoneFormation Formation itedited inin a complex system of bajadas. The succession isis - VSF). constituted for for 69% 69%of ofthe thethickness thicknessof cumulative of cumulativeIn-- In The GdMFGdIVIF (SE Brazil) is a Mesoproterozoic unit 2,500 ceptisols, whichwhich suggestsuggest lowlow developmentdevelopment ofof thethe pedo-pedo- m thick, constituted by by very very finefine-to tomedium-grained medium-grained genesis due to autogenic high and regularly continuous metasandstone. Two vertically and andIateraIly laterallyinterbed- interbed- sedimentary input. ded architectural elements can be described: (i)“cross-(i)”cross- The Bauru Group is a sandstone unit formed by several stratifiedstratified and andplanar planarparallel-laminated parallel-laminatedbeds” beds“and (ii) and (ii) distributive fluvial fluvialsystems. systems.In InSE SEportion portionof the ofBauru the Bauru „flat„flat beds”.beds“. TheThe firstfirstelement elementis isconstituted constitutedof ofsuperim- superim- Group 89% of the thickness is formed of compound InIn-- posed sets of planar- and trough cross-stratifications,cross-stratifications, 1-8 1-8 ceptisols alternatedalternated toto subaqueoussubaqueous sandstonesandstone depositsdeposits m thick, which represent compound or complex dunes generated by sheet floodsfloods inin aa distaldistal portionportionof ofa adistribu- distribu- (draas)(draas) formed of climbingclimbintg> of minor dunes inin dry regime.regime. tive fluvialfluvialsystem. system.Sheet Sheetflood flooddeposits depositsburied buriedprevious previous They are alternated to beds with horizontal or low-angleIow-angle soils and on their deposits developed new pedogenesis. planar-parallel laminations,Iaminations, associatedassociated toto drydry interduneinterdune The development of these palaeosols was controlled by areas. „Flat beds“beds" are composed of horizontal and contincontin-- autogenic periodic and paroxysmal sheet floods,floods, whosewhose uous layers,Iayers, 0.01-0.7 m thick, showingshowintg> climbingclimbinrg> translatransla-- recurringrecurring event was of the order of 103 years. InIn NE porpor-- tent strata, adhesion rippleripple and vortex rippleripple structures, tion of ofthe theBauru BauruGroup Groupthe palaeosol the palaeosol(“60% in (~60%thick- - inthick and isolated simple sets of cross-stratifications.cross—stratifications. „Flat „Flat ness) are constituted ofof AridisolsAridisols andand AlAlfisols,fisols, alternated alternated beds“beds” represent low-lying areas with near-surface water to sheet sand aeolian deposits. These alternations signifysignify table, periodically flooded,flooded, displayingdisplaying isolatedisolated andand smallsmall longIong> periods (of order of 105 years) of topographic stasta-- dunes. „Cross-stratified„Cross-stratified and andplanar planarparallel-Iaminated parallel-laminated bilisation andand pedogenesispedogenesis inin semi-aridsemi-arid oror humidhumid climateclimate beds“beds” probably constituted „isles”„isles“ aboveabove thethe waterwater tabletable alternated to arid conditions, which whichbrought broughtaeolian aeolian where the construction waswas associatedassociated toto climbintg>climbing ofof thethe sedimentation. InIn thisthis case,case, allogenicallogenic factorsfactors controlledcontrolled bedforms. „Flat beds“beds” formed in low-lyinglow-Iying areas, close to the palaeosol/deposit alternations. In Inthe theE portion E portionof of or at the water table, where the construction waswas con-con- the Bauru Group, compound palaeosols are Entisols, trolled by water. InIn both systems, the risingrisinig> of the water InceptisolsInceptisols and andVertisols. Vertisols.Inceptisols Inceptisolsare Iocated are locatedabove above table controlled the accumulation. TheThe GdIVIFGdMF isis anan exam-exam- channel deposits in higher topographic position wherewhere ple where dry and wet aeolian environments coexisted. the sedimentation rate rate was was reduced. reduced. Entisols Entisolsand andVer-- Ver The VSF (SE India) is a Neoproterozoic unit 300 m thick, tisols are arepositioned positionedin interchannel in interchanneldepressed depressedareas areas composed of very fine-fine- to to coarse-grained coarse-grained sandstone. sandstone. where the sedimentation raterate waswas higher.higher. SuddenSudden depo-depo- This is constituted ofthreeof three elements,elements, alternatealternate inin verticalvertical sitional episodesepisodes coveredcovered thethe soilssoils generatinggeneratingcompound compound succession: (i) „cross-stratified„cross-stratified sandstone”, sandstone“,(ii) (ii)„planar- „planar- profiles.profiles. AutogenicAutogenic factorsfactors associatedassociated toto thethe depositionaldepositional laminatedlaminated sandstone“sandstone” and (iii)(iii) „flat„flat beddintg>bedding sandstone”.sandstone“. morphology controlled the type and distribution ofof thethe „Cross-stratified„Cross-stratified sandstone” sandstone“formed formedin a indune a field duneof field of palaeosols. small and isolated transverse dunes. „Planar-laminated„PIanar-Iaminated Comparative studystudy ofof depositsdeposits andand palaeosolspalaeosols aIIowsallows sandstone“sandstone” deposited on a dry sand sheet. „Flat bedding unravellingunravelling> frequency, type and magnitude of the sedisedi-- sandstone“sandstone” is constituted ofof biolaminites,biolaminites, associatedassociated toto mentary processes, which can be integrated into the thethe-- other microbially induced sedimentary structures, and oretical andand applicativeapplicativeanalysis analysisof ofa asedimentary sedimentarybasin. basin. alternated with adhesion and vortex ripples. This eleele-- ment formed on a damp, occasionally wet, sand sheet. Water table controlled the accumulation ofof alIall thethe threethree Water table and biotic effectseffectson onPrecambrian Precambrian elements, but microbial mats contributed to the concon-- aeolian depositional systemssystems inin BrazilBrazil andand struction andand accumulationaccumulationof of„fl at„flatbedding beddingsandstone”. sandstone“. Thus, VSF is an example of Proterozoic aeolian system India India formed with the contribution ofof bioticbioticeffect. effect. G. BasiliciBasilici1‚1, F. R. AbrantesAbrantesJunior1‚ Júnior1, M. V. Soares TheThe-- odoroodorol‚1, A. Cardoso RibeiroRibeirol,1, R. VásconezVäsconez GarciaGarcia11 11IG/UNICAIVIP,IG/UNICAMP, CAMPINAS, Brazil Kinematics ofof subductionsubductionprocesses processesduring during the earthquake cycle in Central Chile Three aeolian depositional systemssystems areare known:known: dry,dry, wetwet and stabilised by vegetation. TheseThese typestypes areare consideredconsidered K. BatailleBataillel,1, L. AguirreAguirre1‚1, C. NovoaNovoaz,2, C. PeñaPe'ria3‚3, F. VeraVera33 end-members because mixing and overlapping are comcom-- 11UniversityUniversity of Concepcion, Earth Sciences, Concepcion, Chile mon in present environments. In the geological record, 2ZGET‚GET, Observatoire Midi-Pyrenees, Toulouse, France 3 mixed dry/wet systems are not commonly recognised 3GFZ,GFZ, Potsdam, Germany Subduction processes processesat atconvergent convergentmargins marginsproduce produce and aeolian systems stabilised by biotic controlcontrol areare re-re- complex temporal and spatial crustalcrustal displacementsdisplacements dur-dur- stricted to the Phanerozoic. inging different periodsperiods oftheof the earthquakeearthquake cycle.cycle. SatelliteSatellite ge-ge- Two atypical water table-controlledtabIe-controlled Proterozoic aeoaeo-- odesy observations provideprovide importantimportant cluesclues toto constrainconstrain lianlian systems are here described: a mixed dry/wet system kinematic models at subduction zones. Here we analyze (Galho(Galho do MiguelIVIiguel Formation -- GdIVIF)GdMF) andand aa systemsystem sta-sta- kinematic models at subduction zones. Here we analyze 32 ABSTRACTS geodetic observationsobservationsin inCentral CentralChile, Chile,where wheretwo twoIarge large Here we will show the results of applying the Greedy earthquakes occurred: Maule in 2010, Mw=8.8, and IllaIIla-- Automatic SignalSignal DecompositionDecomposition(GrAtSiD) (GrAtSiD)algorithm algorithmto to pel in 2015, Mw=8.3. We propose a model that considers the IPOCIPOC continuous GPSGPS stations,stations,along alongwith withthe theassoci- associ- the motion alongalong bothboth interfacesinterfaces ofof thethe brittlebrittlesubduct- subduct- ated kinematic modelsmodels ofof thethe uncouplinguncoupling andand relaxationrelaxation inging slab as the sources responsibleresponsible for the movement processes. With GrAtSiD, we are able to automatically of the crust in the different periodsperiods ofof thethe earthquakeearthquake separate the seismic and aseismic signals in the GPS time cycle. Using standard inversion techniques, we provide series, as well as being able to remove most of the seasea-- a consistent framework of the kinematic displacement displacement sonal oscillation. WeWe willwill firstfirstdescribe describethe thefeatures featuresofthe of the during each period of the earthquake cycle. We show decomposed GPS velocities andand thenthen presentpresent modelsmodels ofof that during the interseismic period prior to Maule and the plate-interface kinematics andand mantlemantle relaxation,relaxation,for for IllapelIIIapel earthquakes, two patches of slip-rate on the lowerIower periods both before and after thethe earthquake.earthquake. ForFor thethe ki-ki- interfaceinterface are determined. These patches are locatedIocated just nematic modelingmodeling wewe willwill showshow ourour progressprogress withwith state-state- below the future hypocenters. Since the interseismic of-theof—the art models that simultaneously solve for strains in period corresponds to the loadingIoading process and the coco-- cuboid volumes and slips on faults. While this modeling seismic to the unloading process, it is interesting toto notenote approach sufferssuf‘fers computationallycomputationallyfrom fromthe theneed needto tosolve solve that the area where loadingIoading isis stronger corresponds to a tremendously large model space, the advantage is that the area where unloading is also strong. Furthermore, itit eliminates the model bias introducedintroduced by the traditional we show that the Maule earthquake causes a signifisignifi- approach of relaxing coseismic stresses in a pre-definedpre—defined cant displacement on the lowerIower interface, just below the arrangement of elastic andand viscoelasticviscoelasticmodel modelblocks. blocks. epicenter of the future Illapel earthquake to the north, a few years later. We speculate that the interaction be-between motion alongalong bothboth interfacesinterfaces areare thethe keykey toto un-un- The Miocene foreland basins of Northern derstand the evolution ofof stressstress andand thethe occurrenceoccurrence ofof Patagonia: sediment transfer systems from earthquakes at subduction zones. zones. This Thisframework frameworkim- - im the Southern Andean to the Atlantic shelf proves the understanding of the observed loading and the Southern Andean to the Atlantic shelf unloading processes, and potential triggering triggeringbetween between A. BilmesBilmesl,1, L.L. D‘EliaD’Eliaz,2, J. CuitiñoCuiti'nol,1, J. BucherBucherz,2, M. LópezLopezz,2, subduction earthquakes.earthquakes. M. GarcíaGarciaz,2, R. FeoFeoz,2, J. R. FranzeseFranzese22 11InstitutoInstituto PatagonicoPatagonico dede GeologiaGeología yy Paleontologia,Paleontología, PuertoPuerto Madryn,Madryn, Argentina 22CentroCentro de Investigaciones Geologicas,Geológicas, LaLa Plata,Plata, ArgentinaArgentina Subduction kinematicskinematicsin inthe theyears yearsbefore before and after thethe 2014,2014, IquiqueIquique MwMw 8.18.1 Unravelling the effects ofof externalexternal controlscontrols onon thethe strati-strati- Earthquake, Chile from de-noised GPS graphic record of a region, as wellweIl as the determination trajectories and joint slip-strain models. of how they impact in the dynamics of a sedimentary system is nowadays a critical gapgap toto solvesolve inin geosciences.geosciences. 1 1 2 3 1 J. BedfordBedfordl,, Z. DengDengl,, M. MorenoMorenoz,, D. LangeLange3‚, B. SchurrSchurrl,, This issue is challenging because it not only involves the 1 H. SotoSoto1 net depositional partsparts ofof thethe systems,systems, butbut also,also, impliesimplies 11HelmholtzHelmholtz Zentrum Potsdam Deutsches GeoForschungsZentrum, the understanding of the dynamic interplayinterplay between Potsdam, Germany erosion, sediment transfer, and deposition as aswell wellas as 22UniversidadUniversidad de Concepción,Concepcion, Departamento de Geofísica,Geofisica, Concepciön,Concepción, Chile temporary storage, and longIong term preservation of ofthe the 33GEOMARGEOMAR Helmholtz Zentrum fuer Ozeanforschung, Kiel, Germany sediments, from source to sink. The Northern Patagonia has an extensive and superbsuperb-- Over 5 years have passed since the April 1stlst 2014 Mw 8.1 lyly exposed Neogene Andean foreland sediment recordrecord IquiqueIquique earthquake inin Northern Chile, during which time extending from the foot of the Southern Andes to the we have captured the relaxation processesprocesses ofof thisthis Iargelarge Atlantic shelf.shelf. ThisThis sedimentsediment transfertransfer systemsystem isis stronglystrongly event with both seismic and geodetic instruments instrumentsof of linkedlinked to the Neogene orogenic growth of the Andes and the IntegratedIntegrated Plate boundary Observatory Chile (IPOC). was synchronously associated with the development of While there exist some Iquique afterslip models modelsthat that profuse magmatism, aa majormajor climateclimate changechange fromfrom wetwet use GPS and InSAR recorded ground motions, wewe havehave to dryer conditions, as asweII wellas asimportant importantrelative relativesea sea not yet explored the spatiotemporal interplayinterplay betweenbetween levelleveI changes. Based on a multidisciplinary approach, approach, afterslip, aftershocks, aftershocks,and andmantle mantlerelaxation. relaxation.Further- Further- which includes new structural, stratigraphic, geomor- geomor- more, several studies that have explored the seismic and phological and geochronological dataset together with geodetic variationsvariationsIeading leadingup upto tothe theevent eventhave havecome come previous surface and subsurface regional surveys, three to different conclusions:conclusions: AtAt thisthis pointpoint itit remainsremains unclearunclear Miocene sediment transfer systems that connected the as to whether the gradual failure of the asperity starts Andes with the Atlantic OceanOcean throughthrough moremore thanthan 600600 acceleratingjust just aa fewfew weeksweeks oror severalseveral monthsmonths beforebefore km were reconstructed. From north to south (45–48°S)(45—48°S) the mainshock. these transfer systems are: CollónCollön Cura–NorthCura—North PatagoPatago-- nian basins system, Ñirihuau–ValdésNirihuau—Valdes basins system and ABSTRACTS 33

Rio Mayo–SanIVIayo—San Jorge basins system (Fig.1). tion of ofthe theCentral CentralAndean Andeandouble doubleseismic seismiczone. zone.The The Stratigraphic correlationscorrelationsalonxg> alongthe thesediment sedimenttransfer transfer ANCORP 96 active sourcesource seismicseismic deepdeep soundingsounding experi-experi- systems indicate a continuous sedimentarysedimentary recordrecord dur-dur- ment allowed correlation of ofdetailed detailedstructural structuralimages images inging the Miocene for the CollónCollön Cura–NorthCura—North Patagonian with seismicity patterns. Here,Here, wewe summarizesummarize ourour recentrecent and the RíoRio Mayo–SanIVIayo—San Jorge basins system. However, for efforts toto characterizecharacterize thethe petrophysicalpetrophysical propertiespropertiesand and the Ñirihuau–ValdésNirihuau—Valdes system, an importantimportant hiatus isis regisregis-- the stress state ofofthe the subducting slabslab fromfrom seismologicalseismological tered inin the distal zone duringdurinig> the middle Miocene (i.e.,(i.e., observations. Rawson-ValdésRawson-Valdes Basin). This stratigraphic gapgap isis interpret-interpret- The plate interface of the Central Andean subduction ed as a consequence of middle-term sediment transient zone becomes activated inin weakweak thrustthrust faulting>faultingevents events storage in the foreland regionregion during the middle MioMio-- down to a depth of 50-km and appears as a sharp reflecreflec-- cene associated with block uplift andand thethe conconfigurationfiguration tor. At 50-km depth the coupling zone ends, the reflectivreflectiv-- of closed-basins. Thus, duringdurinxg> the Miocene sediment ityity pattern ofof thethe plateplate interfaceinterface broadensbroadens characteristi-characteristi- transfer systems functioned asas bothboth fullyfully connectedconnected andand cally and the slab is under tension. The upper seismicity unconnected systems between the Andes and the AtlanAtlan-- plane consists of seismic events that likely activate out-out- tic Ocean.Ocean. Finally,Finally, althoughalthough moremore studiesstudies areare neededneeded toto er-rise bend-faults. It has a homogeneous lateral extent. refinerefine and andimprove improvethe thechronostratigraphic chronostratigraphicframework framework The P-P— to S-wave velocity ratio isis indicativeindicativeof ofmetamor- metamor- of the Miocene sediment transfer systems, early results phosed oceanic crust. of this work show some relevant issues related to the The lower plane of seismicity is laterally heterogeneous origin of environmental signalsSignals and their propagation on a scale of tens of kilometers. Differentialstresses stressesare are through time andand space.space. lowIow inin the updip portion ofof thethe slabslab andand increaseincrease alonrg>along

_.-.1‚.- i . .7” _ d1 J'J' . l! IE'l. . 2|-‚.. “1:“.- the subduction pathwaypathway withwith nono apparentapparent signaturesignature ofof Hiwi-Ü“ reactivation of inherited structures. At the commence - ' cum EM'IH FATAGDHIAN {IGEL-W; _ T; reactivation of inherited structures. At the commence ." F“ _ ._ . 55 MM. of the lower plane of seismicity we findfind aa highhigh P-P- toto S-S- Üun . wave velocity ratio thatthat isis indicativeindicativeof ofthe thepresence presenceof ofa a connected network of fluid-filledfluid-filled vein-like vein-likepores. pores.Alonrg> Along the ANCORP profileprofile thethe placesplaces wherewhere thethe lowerlower planeplane ofof seismicity is present correlate with an increased seismic reflectivityreflectivity above, above,which whichwe weinterpret interpretas asthe thesignature signatureof of fluidsfluids escapinxg>escaping intointo thethe overlyingoverlying slabslab mantle.mantle. At 100-km depth, seismicity and seismic reflectivityreflectivity increaseincrease strongly within the slab. Above, a prominent reflectivityreflectivity structure structureis isvisible visiblewhich whichconnects connectsthe thetop topof of

I-xcca-it-rc Inmc-rnt-acv. “um“ E-C I::- .'-'-.'-.-|II|| r PS. rumä- 111111111 '- -. .1: .. ‚-.--‚-. .- - '- .-.-.-. .' the slab with the magmatic arcarc andand fostersfosters thethe interpre-interpre- g I. . - -- ‚. : ." ".'.. GI "-‘.'-.- '-' . .I . " '.'- :‘. " I ‚_1-.‚-.:.-_ „4.1“ 4 - _u„.;. „.1 |-. -- :---'----.*.' n_.- ;r_-.... -' .'-_--'.-t_-‚ „_„m“ ü- |__: H _ I.' “h“. ._ .______.--.|‚' i |_- -.-| . .‚ . .„J \ “nur.“ .‘HH um... r.“ u ERJ I'r-I-J.Ia.- ”-3-"...- tation thatthat thisthis isis thethe placeplace wherewhere majormajor slabslab de-volatil-de-volatil- Hi'ü” GA |'-.|| 1 r-.u - E5.) I'm-um 5|-' .-.-'‚+ |1“ -'- . - ...... u izationization occurs.occurs.

The Central Andean double seismic zone: seismological constraints on the processes within W. BlochBloch1,2,1,2, T. JohnJohnz,2, J. KummerowKummerowz,2, B. SchurrSchurrl,1, P. SalaSala-- zarzar3,3, P. WiggerWiggerz,2, S. A. ShapiroShapiro22 11GFZGFZ Potsdam, Lithosphere Dynamics, Potsdam, Germany 22FreieFreie Universität, Berlin, Germany 33UniversidadUniversidad CatólicaCatolica del Norte, Antofagasta, Chile

Subduction zones zones worldwide worldwide show showa acommon commonpattern pattern where earthquakes occur in two slab-parallel planar structures, so-called double seismic zones. One plane isis locatedlocated below the plate interface,interface, within the oceanic crust or mantle, the other one, separated by a few to tens of kilometers, insideinside the slab mantle. The processes that cause earthquakes to occur in this particular geom-geometry at intermediate depth are highly debated. Temporary local seismic networks and the permanent regionalregional IPOCIPOC network facilitated the detailed observaobserva-- 34 ABSTRACTS

Tectonic and climatic coupledcoupled processesprocesses inin New insights about South American North Patagonian Andes: Miocene orographic hydroclimate changes during Heinrich barrier uplift andand rainrain shadowshadow generationgeneration Stadials J. BucherBucherl,1, A. BilmesBilmesz,2, L.L. D‘EliaD’Elial,1, M. LópezLopezl,1, M. GarcíaGarcial,1, M. C. CamposCamposl,1, C. ChiessiChiessil,1, M. PrangePrangez,2, S. MulitzaMulitzaz,2, H. A. VarelaVarelal,1, J. R. FranzeseFranzese11 KuhnertKuhnertz,2, A. PaulPaulz,2, I.I. M. VenancioVenancio3,3, A. L. S. AlbuquerAlbuquer-- 11CONICET—UNLP,CONICET-UNLP, Centro de Investigaciones Geologicas,Geológicas, LaLa Plata,Plata, queque“,4, F.F. W. CruzCruzl,1, A. BahrBahr55 Argentina 11UniversityUniversity of SãoSäo Paulo, SãoSäo Paulo, Brazil 2 2CENPAT—CONICE'I',CENPAT-CONICET, IPGP, Puerto Madryn, Argentina 22UniversityUniversity of Bremen, Bremen, Germany 33CenterCenter for Weather Forecasting andand CIimateClimate StudiesStudies (CPTEC),(CPTEC), NationalNational The relationships between betweenclimate climateand andtectonic tectonicpro-- pro InstituteInstitute forfor SpaceSpace ResearchResearch (INPE),(INPE), CachoeiraCachoeira Paulista,Paulista, BrazilBrazil cesses are in the geoscience spotlight during last years. 44FluminenseFluminense Federal University, Niterói,Niteroi, Brazil 5 The uplifting ofof aa mountainmountain rangerange maymay constituteconstitutea atopo- topo- 5HeidelbergHeidelberg University, Heidelberg, Germany graphic barrier to atmospheric circulation, thus produc- graphic barrier to atmospheric circulation, thus produc- Heinrich Stadials (HS) are cold Northern Hemisphere ing the generation of an orographic rain shadow capable ing the generation of an orographic rain shadow capable abrupt millennial-scale events frequently related to dede-- of driving important climatic andand ecologicalecological changes.changes. TheThe creases in the strength of the Atlantic meridionalmeridional over-over- Iink between tectonic and climatic processes has been link between tectonic and climatic processes has been turningturninrg> circulation (AMOC). (AMOC).Model Modelsimulations simulationsand and analysed in several regions of the world. As for the AnAn-- paleoclimate records indicate that the reduction inin oce-oce- dean chain, a main phase of orogenic growth occurred anic heat transport to the Northern Hemisphere duringduring> duringdurinrg> the Miocene, configuringconfiguring several severalAndean Andeanseg- - seg periods of weak AMOC cools down the North Atlantic ments. Some of them were widely analysed, and tectec-- and warms up the South Atlantic. This Thisperturbation perturbationin in tonically controlled climate changes were established. the cross-equatorial heat transport would inin turn affectaf'fect Several works indicate that, in late Miocene times, the Several works indicate that, in late Miocene times, the tropical rainfall.rainfall. Indeed,Indeed, South American hydroclimate orographic uplift ofof thethe CentralCentral AndesAndes triggeredtriggered mean-mean- recordsrecords indicate marked precipitation anomalies anomaliesdur- -dur ingful climatic changes, from wet to dryer conditions. ingful climatic changes, from wet to dryer conditions. inging HS of the lastlast glacial period. However, the scarcity The Southern Andes remain less understood in terms of The Southern Andes remain less understood in terms of of high-resolution marine marinerecords recordsoff offSouth SouthAmerica, America, tectono-climate interactions,interactions, andand onlyonly aa fewfew semi-quan-semi-quan- especially between 7 and 20°S, hampers a mechanismechanis-- titativeapproaches approacheswere wereaddressed addressedfor forthe thepast past20 20Ma. Ma. tic understanding understandingof oftropical tropicalSouth SouthAmerican Americanhydrocli- hydrocli- InIn this work, we analyzed a continuous palaeosolspalaeosols suc-suc- mate responses to HS. Here we investigate pistonpiston corecore cession recorded in a North Patagonian Miocene forefore-- M125-95-3 collected at 10.95°S from a site influencedinfluenced landland basin inin order to understand the moisture regimeregime by the terrigenous discharge of the SãoSäo Francisco River, changes in response to the uplifting ofof thethe PatagonianPatagonian eastern South America, for the last ca. 70,000 years. In Andes. Based on macromorphological, micromorphomicromorpho-- order to reconstruct changes in precipitation over over the the logicallogical and geochemical analysis, supported with a time SãoSäo Francisco River drainage basin we determined the scheme, the palaeosols were characterized with their major elemental composition alonrg>along thethe pistonpiston core.core. ToTo correspondingcorrespondintg> Mean Annual Paleoprecipitation (MAP) (MAP) gain mechanistic insights insightsinto intotropical tropicalSouth SouthAmerican American and Mean Annual Temperature (MAT) values. Alfisol-likeAlfisol-like hydroclimate changes we analyzed a HS-simulation withwith palaeosols were identified at the base of the foreland palaeosols were identified at the base of the foreland a high-resolution versionversion ofof thethe atmosphere—oceanatmosphere-ocean gen-gen- infillinfill (15-14.6(15-14.6 Ma)Ma) withwith MAPMAP ofof 12291229 i± 108108 mm/yr.mm/yr. An-An- eral circulation modelmodel CCSM3.CCSM3. OurOur newnew elementalelemental recordrecord disol-like palaeosols were recognized in the middle secsec-- shows marked increases in SãoSäo Francisco River sediment tion ofof thethe sequencesequence (14.6-12.75(14.6-12.75 Ma)Ma) withwith MAPMAP ofof 10561056 discharge to the eastern South Atlantic duringduring HS.HS. ItIt isis ±i 108 mm/yr, whereas Aridisol-likeAridisoI-like palaeosols localizedIocalized the southernmost marine paleoclimate recordrecord offof‘f east-east- at the top of the infillinfill (12.75-11.5(12.75-11.5 Ma)Ma) presentedpresented MAPMAP ern South America that unequivocally records the HS of of 677 ±i 108 mm/yr. Mean Annual Temperatures has not the lastlast glacial period. Additionally, ourour high-resolutionhigh-resolution meaningfully changed since the Miocene (~11(“11 ±i 2.1°C) model output allows new insights into the drivers of to the present (11°C). These data indicateindicate a continuous changes in South American hydroclimate duringduring> HS. decrease in MAP (>600 mm/yr) and stable MAT between 15-11.5 Ma for the North Patagonian extra Andean rere-- gion. The decrease in the rainfalls may be related to the Multi-physics inversion of gravity and uplift ofof thethe PatagonianPatagonian AndesAndes andand thethe rainrain shadowshadow gen-gen- Multi-physics inversion of gravity and eration. The Theresults resultsindicate indicatethat thatalthough althoughthe Patago- the - Patago magnetic datadata inin LosLos HumerosHumeros SuperSuper HotHot nian Andes started the uplift aroundaround 1919 Ma,Ma, aa time-delaytime-delay Geothermal System, MéxicoMexico of ~4“4 Myr with the rain shadow generation occurred,occurred, andand J. Carrillo LopezLopezl,1, M. A. Perez-FloresPerez-Floresl,1, E. SchillSchill11 the rainrain shadow effects werewere effectivelyeffectivelyrecorded recordedsince since 11CICESE,CICESE, Applied Geophysics, Ensenada, Mexico ∽I14.614.6 Ma. Therefore, between 19-14.6 Ma, the North Patagonian Andes were not high enough to generate a Over the last decades, the worldwide increasing demand rainrain shadow effect. for clean energies has become the geothermal energy an importantimportant alternative resource.resource. TheThe GEMexGEMex projectproject isis aa ABSTRACTS 35 cooperation onon geothermalgeothermal energyenergy researchresearch ofof aa Mexi-Mexi- on quality criteria. The overall range of concentrations can and European consortium focusedfocused onon thethe studystudy andand isis 15.7 - 83.5 mg g-1g—l for aluminum, 1.4-17.9 mg g-1g-l for development of two geothermal zones in Mexico.IVIexico. The chromium, 22.8 - 379.5 mg g-1g-l for iron, 1.5 - 56.2 mg g-1g-l firstfirst placeplace isis aa candidatecandidate forfor EnhancedEnhanced GeothermalGeothermal Sys-Sys- for manganese, 0.9 - 6.2 mg g-1g-l for nickel, 56 —– 1094 μgpg tem (EGS) at Acoculco, within a Pliocene-PleistocenePIiocene-Pleistocene volvol-- g-1g-l for cobalt, 6 -126 μgug g-1g-l for arsenic, 17 to 146 μgpg g-1g-l canic complex with high temperatures found from two for copper, 6 - 66 μgpg g-1g-l for lead,Iead, and 64 - 576 μgug g-1g-l for exploration wellswells butbut Iowlow permeability.permeability. TheThe secondsecond placeplace zinc. The resultsresults obtained from the studied coastal zone isis a Super Hot Geothermal System (SHGS)(SHGS) at Humeros, show a high levelleveI of pollution inin surfacesurface sediments.sediments. TheThe within a Quaternary volcanic complex with super hot spatial distributiondistributionof ofthe theelements elementsvaried variedaccording accordingto to temperatures about 380° C near a conventional systemsystem the analyzed elements: Al,AI, Cr, FeFe and Ni showed high levlev-- that isis currently being exploited. Since geothermal rere-- els of concentration throughoutthroughout thethe studiedstudied zone;zone; |VIn,Mn, sources are locatedIocated beneath the surface of the ground, Co, Cu, As and Zn are in a higher proportion inin IVIoaMoa BayBay non-invasive and large coverage geophysical data play Cay. In the case of As and Pb, higher concentrations werewere a key role for the definitiondefinition of ofdeep deepstructures. structures.In Inthis this locatedIocated at the deltas of MoaIVIoa and Cayo Guam riversrivers and study, we present a 3D regional joint inversion of gravity also in some areas in the west of the bay. and magnetic datadata fromfrom thethe LosLos HumerosHumeros VolcanoVolcano Com-Com- plex (LHVC) that includes the conventional andand supersuper hothot geothermal fields.fields. WeWe developeddeveloped aa versatileversatilealgorithm algorithmto to Thermochronology of the SãoSäo Francisco jointly estimate densitydensity andand magnetizationmagnetization3D 3Dstructures structures Craton and Araçuaí-RibeiraAracuai—Ribeira Orogenic System using gravity and magnetic datadata thatthat takestakes advantageadvantage ofof Transition direct unknown relationships thatthat allowallow preservingpreserving thethe Transition resolutionresolution ofof individualindividual methodsmethods andand rerely moremore onon thethe A. O. ChavesChavesl‚1, L.L. G. KnauerKnauer1‚1, A. W. RomanoRomanol,1, B. A. properties values values themselves themselvesin incontrast contrastto tostructural structural Alemao MonteiroMonteirol,1, A. L. XimenesXimenesl,1, C. E. VieiraVieira1‚1, G. B. minimization approachesapproaches thatthat rerely moremore onon thethe proper-proper- VargasVargasl,1, C. LanaLanaz,2, M. SilvaSiIva2‚2, A. R. AlkiminAlkimin22 ties changes.changes. TheThe resultsresults fromfromjoint joint inversioninversion showedshowed aa 11UniversidadeUniversidade Federal de Minas Gerais, Instituto dede Geociäncias,Geociências, BeloBelo linkIink between lowIow density, lowIow magnetizationand andmajor major Horizonte, Brazil 2 fault zones with high relevancerelevance to geothermal assessassess-- 2UniversidadeUniversidade Federal de Ouro Preto, Geology, Ouro Preto, Brazil ment. In general, a more accurate integrated subsurface The SãoSäo Francisco Craton (SFC) southern portion, mostmost imageimage isis achieved inin ourourjoint joint inversioninversion approach. Finally, known for hosting thethe mineralmineral provinceprovince ofof thethe Quadri-Quadri- the 3D magnetizationand anddensity densitymodels modelsare areexpected expected láterolatero FerríferoFerrifero (Iron(Iron Quadrangle) isis surrounded by BrasiBrasi-- to be used as important constraints in the electrical and linoIino orogenic belts inin allalI sides but the Atlantic coast.coast. TheThe seismic modeling which as a whole will help us to the Araçuaí-RibeiraAracuai-Ribeira orogenic system (AROS), locatedIocated on the construction andand understandingunderstanding ofof thethe geothermalgeothermal con-con- southeastern margins of the SãoSäo Francisco Craton is asas-- ceptual model. sembled by the AraçuaíAracuai orogen to its northern portion and the Ribeira belt to the south. This report presents

monazite and rutile U-PbU-Pb agesages andand thethe applicationapplicationof ofthe the Metal accumulation inin surfacesurface sedimentsediment ofof Zr-in-Rutile-ThermometerZr-in-RutiIe-Thermometer for for the theunderstandintg> understandingther- -ther the urban and industrial coastal area of the mochronology of the SFC and AROS Transition. municipality of Moa (Cuba): distribution andand Two distinct sampIe samplesets setswere wereevaluated. evaluated.One Onerep-- rep pollution assessment.assessment. resentsresents monazite collected on the quartz veins associassoci-- ated with the deformation ofof thethe metapeliticmetapeliticrocks rocksfrom from 1 2 1 Y. Cervantes GuerraGuerral,, H. J. GurskyGurskyz,, A. RodríguezRodrl’guezl,, A. Serra de Santa HelenaHeIena Fm. and other represents rutile 3 PierraPierra3 from metaultramaficmetaultramafic rocks rocks of ofthe theQuebra-Osso Quebra-OssoGroup. Group. 11MoaMoa University, Vice Chancellor for Research, Moa,IVIoa, Cuba Both monazite and rutile compositionscompositionswere weredetermined determined 2 2InstitutInstitut fürfür GeologieGeologie undund Paläontologie/TUPaläontologie/TU Clausthal,Clausthal, Clausthal—Clausthal- with JEOL electron microprobe (EMP)(EIVIP) JXA-8900JXA-89OO through Zellerfeld, Germany 33UniversityUniversity of Computer Science, La Habana, Cuba Wavelength-dispersive X-ray spectroscopy (WDS) and the monazite imaging through backscattered Electrons Electrons The investigation is isto toevaluate evaluatethe theaccumulation accumulationof often ten (BSE).(BSE). The MonaziteIVIonazite age obtained through U-Th-PbT elements (Al,(AI, Cr, Fe, Mn,IVIn, Ni, Co, As, Cu, Pb and Zn) in dating method methodresulted resultedin in538+-23 538+-23Ma for Ma formonazite monazite surface sediments from the urban and industrial coastal crystallization. TheThe U-PbU-Pb datadata ofof thethe rutilerutilecrystals crystalswere were area of Moa.IVIoa. Human activity hashas ininfluencedfluenced the theregion, region, achieved by Sector FieldFieId LA-ICP-MSLA-ICP-IVIS equipped with a CECE-- which has been developing in one of the most imporimpor-- TAC LSX-213 Nm G2 laserIaser ablation system system equipment. equipment. tant miningmining> regionsregions of Cuba since the middle of the past Tera-Wasser burg ages were calculated using Isoplot. The century. Two methods were used to assess the contamicontami-- age obtained was 540.3+-4.4 MaIVIa for rutile recrystalliza-recrystalliza- nation of ofthe thesediments: sediments:the theestimation estimationof metaI ofen- metalen- tion. richmentrichment by calculating the theindex indexof ofgeo-accumulation geo-accumulation For the metamorphism analyses in the studied area, (Igeo)(Igeo) and the interpretationinterpretation ofof thethe datadata obtainedobtained basedbased the Zr-in-Rutile-Thermometer was was adopted. adopted. In Inalpha- alpha- 36 ABSTRACTS quartz stability fieldfield thethe temperaturetemperature maymay bebe obtainedobtained accumulation ofof respiredrespired carbon.carbon. InIn thethe upperupper waterwater col-col- as follows: umn (uppermost ~200“200 m), the shallowest portion ofof thethe T (oC) = [(83.9[(83.9 + 0.410Pkbar)/(0.14280.410Pkbar)/(O.1428 - RlnppmZr)]RInpmr)] —– mixed layer migrated southwards following a shift ofof thethe 273, where R = 0.0083144 kJ K-1 IntertropicalIntertropical Convergence Zone and impactingimpacting thethe distri-distri- The adoption of ofthe theknown knownregional regional7kbar 7kbarpressure pressure bution ofof nutrientsnutrients inin thethe equatorialequatorial AtlanticAtlanticOcean. Ocean.The The resultedresulted inin an average temperature of 571°C with 8°C of southward migration of ofthe theIntertropical IntertropicalConvergence Convergence standard deviation. Zone together with positive sea seasurface surfacetemperature temperature The known regional metamorphic peak around ~570“570 anomalies both in the western tropical Atlantic Ocean Ocean Ma,IVIa, with temperatures over 600 °C would have reset and the eastern equatorial PacificPacific OceanOcean producedproduced posi-posi- the rutilerutile U-PbU-Pb systemsystem duringduring itsits recrystallizationrecrystallizationin inthe the tive precipitationprecipitationanomalies anomaliesaII allthe theway wayfrom fromNE NEBrazil Brazil metaultramaficmetaultramafic rockrock untiluntilthe theclosure closureof ofthe theU-Pb U-Pbsystem system to western Amazonia. The positive precipitationprecipitationanom- anom- at 540 Ma.IVIa. Thermochronology of the SFC and AROS trantran-- aly over Amazonia was, however, divided in two phases sition atat “540~540 MaMa andand “570~570 °C°C suggestssuggests thethe ideaidea ofof aa that distinctly af‘fectedaffectedAmazonian Amazonianhydroclimate hydroclimateand andthe the post-orogenicpost—orogenic collapse and retrograde metamorphism at ARF. The transition from fromthe thefirst firstto the to second the secondphase phase the end of Precambrian. was characterized by: (i) a migration ofof thethe mainmain locuslocus of precipitation fromfrom thethe tropicaltropical AndesAndes toto centralcentral Ama-Ama- zonia; (ii) a southward shift ofof thethe tropicaltropical rainrain beltbelt withwith Tipping elements of the climate system and a marked decrease of precipitation over over northernmostnorthernmost marine sediments: The Western tropical Amazonia;Amazonia,- and (iii) a strong reduction inin westernwestern equa-equatorial Atlantic sea seasurface surfacesalinity salinitydespite despitethe sluggish the sluggish Atlantic and the adjacent South America Atlantic and the adjacent South America AMOC. Finally, the southward migration of ofthe thetropi- tropi- C. ChiessiChiessil,1, S. MulitzaIVIulitzaz,2, S. CrivellariCrivellari3,3, C. HäggiHäggiz,2, N. cal rain belt produced a decrease in the area covered HöppnerHöppnerz,2, S. KasemannKasemannz,2, H. KuhnertKuhnertz,2, R. Portilho- by the ARF, most probably in its northernmost reaches RamosRamosz,2, M. PrangePrangez,2, G. SampaioSampaio“,4, A. SawakuchiSawakuchi3,3, E. where open vegetation typestypes expanded.expanded. Thus,Thus, geologicalgeological SchefußSchefußz,2, I.I. VoigtVoigtz,2, Y. ZhangZhangz,52,5 archives from the tropical Atlantic OceanOcean andand adjacentadjacent 11UniversityUniversity of SãoSäo Paulo, School of Arts, Sciences and Humanities, SäoSão South America allowaIIow exploring the multiple flavorsflavorsof oftwo two Paulo, Brazil tipping elements,elements, namelynamely AMOCAMOC andand ARF.ARF. TheseThese flavorsflavors 2 2UniversityUniversity of Bremen, MARUM - Center for Marine Environmental cannot be otherwise explored in the short instrumental Sciences, Bremen, Germany 33UniversityUniversity of SãoSäo Paulo, Institute ofof Geosciences,Geosciences, SäoSão Paulo,Paulo, BrazilBrazil recordrecord but contribute to an improved understanding of 44NationalNational InstituteInstitutefor forSpace SpaceResearch, Research,Center Centerfor forWeather WeatherForecasting Forecasting the physical mechanisms controlling them. and Climate Studies, Cachoeira Paulista, Brazil 5 5UniversityUniversity of Hong Kong, Department of Earth Sciences, Hong Kong, Hong Kong Structure and geodynamics of the collision The Atlantic meridionalmeridional overturningoverturning Circulationcirculation(AMOC) (AMOC) zones of the Nazca and Juan FernándezFernandez as wellweII as the Amazon rainforest (ARF) have been concon-- Ridges with South America sidered policy-relevantpolicy—relevant tipping elementselements ofof thethe climateclimate 1 system. InIn short, this means that: (i) they may pass a E. Contreras-ReyesContreras-Reyes1 critical thresholdthreshold atat whichwhich aa smallsmall perturbationperturbationmay maysig- sig- 11UniversidadUniversidad de Chile, Geophysics, Santiago, ChileChile nificantlynificantly changechange thethe wayway theythey function;function;and and(ii) (ii)anthro- anthro- The west coast of South America is a major plate bound- pogenic forcing may prompt the critical thresholdthreshold toto bebe The west coast of South America is a major plate boundary where the oceanic Nazca Plate „is forced to subduct“subduct” exceeded. The possible consequences of exceeding this beneath the continental South SouthAmerican AmericanPlate. Plate.This This critical threshold thresholdinclude includea collapse a collapseof the of AMOC the and AMOC and plate boundary generates magnitude 8-9 earthquakes a dieback of the ARF. These two tipping elements elementsare are on a regular basis, such as the historic Peruvian 1868 and particularly relevantrelevant forfor thethe tropicaltropical AtlanticAtlanticOcean Oceanand and Chilean 1960 megathrust earthquakes. The seismogenic adjacent South America. Despite their relevance, largeIarge segments and the structure of the continental margin margin uncertainties areare associatedassociated withwith thesethese tippingtippingelements elements along this subduction zonezone areare ininfluencedfluenced by bytopograph- topograph- and there is an urgent need to improve our understandunderstand-- icic ridgesridges on the oceanic plate that are caused by hotspot inging of the physical mechanisms controlling them. Here tracks, representingrepresenting lineslines ofof volcanoesvolcanoes generatedgenerated byby par-par- we show a selection ofof classic,classic, recentrecent andand unpublishedunpublished tial meltingmeltingdue dueto tohot hotplumes plumesrising risingwithin withinthe theEarth’s Earth‘s studies based on geological archives that recorded the mantle. Examples include the Juan Fernandez Ridge responseresponse of the tropical Atlantic OceanOcean andand thethe adjacentadjacent (JFR),(JFR), which was formed far from the East PacificPacific RiseRise onon South America to a marked slowdown in the AMOC that a off-ridgeoff—ridge setting.setting.and andthe theNazca NazcaRidge Ridge(NR), (NR),which whichwas was occurred between ca. 18.1 and 14.7 cal ka BP (Heinrich formed near the East Pacific Rise. The crustal structure Stadial 1). During the AMOC slowdown, the mid-depth formed near the East Pacific Rise. The crustal structure of these hotspot tracks differs inin thicknessthickness andand composi-composi- (~1000-3000(“1000-3000 m water depth) western tropical Atlantic tion. Ocean experienced a major stagnation (probably (probablythe the largestIargest inin the Atlantic Ocean)Ocean) thatthat allowedallowed forfor aa markedmarked ABSTRACTS 37

Towards visualization possible ﬂuid pathways LLJ Towards visualization possible fluid pathways - 6000 using gravity in the Los Humeros and EÜÜÜ [m] Acoculco Geothermal Fields 400l] N. CornejoCornej01‚1, E. SchillSchilll'z,1,2, S. HeldHeld2‚2, J. Carrillo LopezLopez3‚3, M. EÜÜCI PérezPerez33 1 ü 1KIT,KIT, INE, Karlsruhe, Germany 22KIT,KIT, AGW, Karlsruhe, Germany —EÜÜÜ 33CICESE,CICESE, GeofísicaGeofl’sica Aplicada,Aplicada, Ensenada,Ensenada, MexicoMexico

—4 ÜÜÜ GEMexGEIVIex is a cooperation project projectin ingeothermal geothermalenergy energy "EÜÜCI Bathymeteüpngraphy researchresearch is being carried out between Mexico and the -BÜÜ{I European Union since the end of 2016 for development -‘IÜÜÜÜ of Enhanced Geothermal Systems (EGS) and Superhot Geothermal Systems (SHGS) in two unconventional sitessites inin Mexico, LosLos Humeros and Acoculco. Both geothermal fields areare locatedlocated inin volcanicvolcanic settingssettingswithin withinthe theTrans- Trans- The JFR presents a normal oceanic crust ~7“7 km thick with MexicanIVIexican Volcanic Belt. Los Humeros fieldfield inin currentlycurrently un-un- largelarge extrusive seamounts of up to 4500 m surrounded der exploitation andand thethe areaarea t0to thethe northnorth ofof thethe currentcurrent by a rough topography. In contrast, the NR hosts an over-over— production ifif significantlysignificantlyhotter, hotter,with withmore morethan than380°C. 380°C. thickened oceanic crust of 1717 km thick with largelarge amount The high temperatures and the water chemistry are the of crustal intrusion material. The surrounded seafloorseafloor ofof principal challenges in this part of the reservoir. On the the NR isis smooth and shallow (swell topography 150-200 other hand, in Acoculco, only two exploration wellswells havehave km wide and up tot0 1.51.5 km high). This swell topography been drilled. The temperatures rise tot0 about 300°C at a was formed by the thermal effect ofof reheatingreheatingthe theoce- oce- depth of 2 km. The high temperature gradient and the anic lithosphereIithosphere during its interaction with witha ahotspot hotspot undiscovered resource makes it an interesting targettarget forfor plume and the buoyancy effect ofof thethe anomalouslyanomalously over—over- exploitation andand testingtestingof ofour ourknowledge. knowledge. thickened crust. Flexural models show that the JFR was This study aims at visualize and characterize reservoir fomed onto relativelyrelatively oldold andand rigidrigid oceanicoceanic Iithospherelithosphere condition inin LosLos HumerosHumeros usintg>using gravitygravity byby calibratingcalibratingthe the ~37“37 Ma with an elastic thicknessthickness (Te)(Te) of10-15of 10-15 km.km. InIn con-con- data with data from the geothermal wells. In a second trast, the swellsweII topography of the NR isis consistent with step the transferability of the findings t0 to the thenorthern northern a flexuralflexural modelmodel withwith littlelittleelastic elasticrigidity rigidity(isostatic (isostaticcom- com- part of Los Humeros and in a third step to Acoculco site pensation oror TeTe << 22 km)km) consistentconsistent withwith aa hotspothotspot ridgeridge willwiII be tested. To accomplish this, In Acoculco, a total of formed near an active spreadingspreading center.center. 84 gravity stations werewere acquiredacquired inin anan aboutabout 55 Xx 33 kmkm Landward, the ridge-trench collision zones of the JFR rectangularrectangular grid oriented NE-SW and NW-SE with a typitypi-- and NR are characterized by subsidence and subduction cal station distancedistance ofof 400400 mm toto eacheach other.other. InIn LosLos Humer-Humer- erosion of the continental wedgewedge andand thethe presencepresence ofof aa os, a total of 344 gravity stations werewere measuredmeasured inin twotwo slope trenchward-dipping scarp (1000-1500 m of vertical different surveys.surveys. InIn thethe firstfirstcampaign campaign263 263stations stationswere were offset)Offset) atat thethe slope-shelfslope-shelf transition.transition.The Thecontinental continentalsheIf shelf measured along ten E-W profiles ofof 5.55.5 kmkm Iengthlength withwith isis uplifted andand underlyinrg>underlying byby highhigh seismicseismic activityactivitycorre- corre- typical inter-stationinter-station andand inter-profileinter-profiledistances distancesof of200 200m m latedIated to the subduction ofof thethe NazcaNazca andand JuanJuan Fernan-Fernán- and 500 m, respectively. TheThe surveysurvey waswas completedcompleted byby aa dez Ridges. Linking the earthquake rupture characterischaracteris-- NE-SW oriented and 31 km long profileprofile acrossacross thethe studystudy tics of oflarge largeunderthrusting underthrustingearthquakes earthquakesand the anddeep the deep area. This profile includesincludes 8181 gravitygravity stationstationwith withan anin- in- structure of the NR and JFR suggest that these oceanic ter-station distancedistance ofof aboutabout 375375 m.m. InIn total,total, 341341 stationsstations ridgesridges act as both asperities andand barriersbarriers forfor earthquakeearthquake were used for further evaluation inin LosLos HumerosHumeros field.field. rupturerupture propogation. ThisThis dualdual behaviorbehavior isis complexcomplex andand From Bouguer anomalies, residuals anomalies were can be controlled by a combination ofof factorsfactors includingincluding calculated and analyzed in a pseudo-tomography by ButBut-- the subduction erosionerosion degree,degree, buoyancybuoyancy forcesforces ofof thethe terworth filtering. Caldera Calderastructures structuresas asweII wellas faults as faults subducting ridge,ridge, elasticelasticenergy energyacumulated acumulatedduring duringthe the were identified. In Inorder ordert0 toobtain obtainunconstrained unconstrainedinfor- infor- interseismicinterseismic period, and the hydrological properties of of mation onon thethe ininfluencefluence of ofthe thecaldera calderaand andfault faultstruc- struc- the frictional contactcontact amongamong othersothers factors.factors. tures, inverseinverse modelingmodelinxg> was carried out. Both, residual anomalies and inversion results reveal a high fault control on the gravity and thus the density disdis-- tribution. TheThe alignmentalignment oftheof the majoritymajority oftheof the anomaliesanomalies followsfoIIows NE-SWNE—SW and NW-SE trendingtrendinxg> fault orientations. AtAt reservoirreservoir level,level, in Acoculco, a significant high-density high-density anomaly is observed down to sea level in the area, where the two geothermal wells were drilled. At Los Humeros, 38 ABSTRACTS the N-S trending secondary faults in the northern part of lineslines(Fig.1).The (Fig. 1). The arch isis characterized by multiple rereflecflec-- the geothermal fieldfield alsoalso coincidecoincide withwith relativelyrelativelyhigh- high- tion terminationsterminationsat atits itstop topand andflanks; flanks;the theinterpretation interpretation density anomalies, whereas the NE-SW to E-W trending of onlaps and truncations enablesenables thethe reconstructionreconstructionof of secondary faults are characterized by low-density. itsits tectonic history.

Regional transect across the Quirquincho Deformation andand differentialdifferentialsubsidence subsidencein in Arch (NW Argentina) the NeuquénNeuquen Basin, outlines for hydrocarbon V. CortassaCortassal'z,1,2, E. A. RosselloRosselloz,2, S. BackBack3,3, R. OndrakOndrak“,4, M. exploration 1 StreckerStrecker1 E. CristalliniCristallinil,1, R. TomezzoliTomezzoliz,2, M. MazzoniIVIazzoni3,3, C. GuzmánGuzmän3,3, 11UniversitätUniversität Potsdam, Institute ofof Geosciences,Geosciences, Potsdam-Golm,Potsdam-Golm, N. HernándezHernändez33 Germany 11UniversidadUniversidad de Buenos Aires - LA TE Andes -— CONICET, Geological SciSci-- 22UniversidadUniversidad de Buenos Aires, Ciencias Geologicas, Buenos Aires, ences, Florida, Vicente Lopez, Argentina Argentina 22IGEBA—CONICE'I',IGEBA-CONICET, Paleomagnetism, CiudadCiudad dede BuenosBuenos Aires,Aires, ArgentinaArgentina 33RWTHRWTH Aachen, Geologisches Institut, Aachen,Aachen, GermanyGermany 33IDEAN-CONICET,IDEAN-CONICET, Modelado Geológico,Geolögico, Ciudad de Buenos Aires, 44GFZGFZ Deutsche GeoForschungsZentrum, Potsdam, Germany Argentina The Chaco-Pampean plain of the Argentine AndeanAndean fore-fore- The NeuquénNeuquen basin is one of the main hydrocarbon propro-- landland covers the Chaco-Paranaense intracratonicintracratonic basin ducers in Argentina andand alsoalso hashas oneone ofof mostmost potentialspotentials and the eastern portion of the Cretaceous Salta Ritt ba- and the eastern portion of the Cretaceous Salta Rift -ba inin the world from the capitalization ofof itsits mainmain sourcesource sin. At surface, there is no direct evidence for a complex sin. At surface, there is no direct evidence for a complex rock:rock: the Vaca MuertaIVIuerta Formation. ItsIts historyhistory startedstarted byby tectonic history of this region.region. Subsurface data, howevhowev-- the development of a riftritt systemsystem duringduring LateLate TriassicTriassic —– er, document a geological history of magmatic episodes,episodes, Early Jurassic, subsequently filledfilled with withsag sagfacies facieschar- - char multiple tectonic tectonic events events and andsedimentation sedimentationcontrolled controlled acterized by successive regressions and transgressions by tectonics. Inherited subsurface structures are characcharac-- of eustatic origin. origin.The TheTriassic Triassicextension extensionwas resolved was resolved terized by a preferential NE-SW orientation. This orienta- terized by a preferential NE-SW orientation. This orienta- with normal faults of NO-SE to ONO-ESE orientation andand tion isis alsoalso broadlybroadly rereflectedflected by bythe theoverall overalltrends trendsof ofthe the transfer zones of NE-SWNE—SW orientation. SinceSince Cretaceous,Cretaceous, adjacent Sierras Pampeanas broken-foreland province, itit became a foreland basin linkedIinked to the Andean orogorog-- the Colonia-Aldao High and the LasLas BreñasBrer'ias depocenter. eny, that printed in the western sector, a N-S fault and This study compiles and reviews available subsurface inin-- thrust belt. However, this apparently simple history has formation includingincluding boreholeborehole data,data, 2D2D seismic-reseismic-reflectionflection some particular complexities.complexities.Towards Towardsthe thesouth southof ofthe the lines and topographic data to reconstruct the tectono- lines and topographic data to reconstruct the tectono- basin, a narrow E-W trending fold and thrust belt was sedimentary history along a regional NW-SE transect bebe-- developed during Middle Jusrassic —– Lower Cretaceous. tween Tartagal (Salta province) and Formosa city (For(For-- The inversion of some of the Triassic structures, develdevel-- mosa province); key focus is the analysis of the oped an E-W structural height (Huincul) that controlled multi-episodic activity activityof ofthe theQuirquincho QuirquinchoArch Arch(also (also the facies distribution during duringJurassic Jurassicand andCretaceous. Cretaceous. known as the Rincón-CaburéRincÖn-Cabure High). This structure is an Both the Jurassic and the Cretaceous-Tertiary (Andean)(Andean) extensive and prominent basement ridge that consticonsti-- compressional deformation, invertinvert somesome ofof thethe TriassicTriassic tutes the boundary between the Chaco-Paranaense baba-- structures. However, unlike what was initially assumed,assumed, sin and the Salta Rift depocenters.depocenters. TectonicTectonic activityactivityalong along the inversion effect waswas notnot asas important.important. ThisThis isis mainlymainly the Quirquincho Arch isis interpretedinterpreted to have controlled because, both compression vectors are oblique to the the facies distribution of ofsyntectonic syntectonicsequences sequencesin the in the Triassic structures and therefore only some segments two adjacent basins during the Paleozoic and Mesozoic.IVIesozoic. of some faults were inverted. The Jurassic compression, „w ‚w.- THmSEcr 5E from south, printed a dextral component inin the southsouth--

:‘. -- r A-a ._ S.|ll.|F-':':Ü;nr| I "'""*"'r" "l "l I::.1:|r.rap.1.'.|r--n-::r.-:has-'- ernmost NO-SE Triassic faults, whereas the Cretaceous- - .._-_:ﬁel __ -...-_ _--__ _. _ Tertiary AndeanAndean orogeny,orogeny, printedprinted aa sinistralsinistral componentcomponent 1."._ _. - - .- -- _ -.- - -- _..T. '_ -.—| - 1*! —— - 5.15 - -_--".-"' .' ' ' -

. - ... _ .....-.-_ _ . - '_-_ —_.-_' i . __‚_-__—.-"H_. __‚__---—_—..__'.. ..—-____‘_ over the westernmost NO-SE Triassic faults of the basin. . ._ ._ .. . Ei" - -' _ . —... a-'-' 7’ i'L_-—..--' -.- - To the southwest of the basin, the extensional structures :|-:-' I. _ and both principal compression vectors are overlapped, 4e: s | I developing areas with very complex structures. MakingIVIaking things even more complex, the differentialsubsidence subsidence Figure 1. Seismic transect across the Quirquincho Arch. mechanism is over imposed to all deformation process.process. This is a lessIess spectacular process, however, is very funfun-- The interpretation ofof 2D2D seismic—reseismic-reflectionflection data dataand andweII- well- damental for hydrocarbon distribution inin thethe basin.basin. TheThe loglog informationinformation allowedallowed toto identifyidentifythe theexact exactsubsurface subsurface differentialcompaction compactionbetween betweenbasement basementand andTriassic Triassic position andand shapeshape oftheof the QuirquinchoQuirquincho Arch.Arch. ItsIts presencepresence half grabens infill,infill, controlled controlled a aseries seriesof ofnormal normalfaults faults isis unambiguously reflectedreflected onon variousvarious seismic-reseismic-reflectionflection that grew during early Cretaceous grouped above TriTri-- ABSTRACTS 39 assic shoulders. These structures conditioned the themi- - mi geochronological and magnetostratigraphic analysisanalysis re-re- gration and andaccumulation accumulationof the of hydrocarbon the hydrocarbonin some in some veals that the main infillinfiII ofof thethe basinsbasins hashas aa maximummaximum of the biggest gas and oil fieldsfields ofof thethe basin.basin. TheThe effecteffect depositional time timeprocess processof 128 of Ky 128related Ky relatedto PDC toas PDCas of differentialsubsidence subsidenceis iscontinuous continuousover overtime, time,and and well as resedimented volcaniclastic materials, materials,whereas whereas controls even current basin troughs. ItsIts consequences, along the system their show changes in the infillinfill patternspatterns are more evident and visible in areas of low compressive and in the transference systems occurred during middle- deformation, however,however, therethere areare alsoalso recognizedrecognized inin thethe upper Miocene. These changes are recorded together Jurassic (Huincul)(Huincul) and Cretaceous-Tertiary (Andina)(Andina) foldfold with huge climate change related to the uplift andand ex-ex- and thrust belts. The effect thatthat thisthis mechanismmechanism couldcould humation oftheof the Andes,Andes, connection/disconnectionconnection/disconnectionofthe of the produce a distortion inin thethe presentpresent stressstress fieldfieldof ofthe theba- -ba system with shelf and sea levellevel variations. FutureFuture worksworks sin that is currently being studied. The understanding of will aim to the understanding how the subtle interplayinterplay-- this process isis very important for planning developing of inging of tectonic-volcano-climatic-eustaticforcing forcingcontrols controls non-conventional fieldsfieldsin inVaca VacaMuerta MuertaFormation. Formation. determine the reciprocal stratigraphy and andits itspropaga- propaga- tional effectseffectsfrom fromthe theAndes Andesto tothe theAtlantic Atlanticsea. sea.

Tracing the volcanic and tectonic effects of the Miocene Andean stage along the Stratigraphic architecturearchitecture inin earlyearly stagesstages ofof Patagonian retroarc: an example of the RíoRI’o intermontaneintermontane basin: the Miocene CalchaquíCalchaqui Negro system, Argentina foreland, NW Argentina 1 2 2 3 L. D‘EliaD‘Elial,1, A. BilmesBilmesz,2, M. LópezLopezl,1, J. BucherBucherl,1, M. GarcíaGarcial,1, C. E. del PapaPapal,, P. PayrolaPayrolaz,, F. HongnHongnz,, H. PingelPingel3,, M. Do 4 1 3 R. FeoFeol,1, J. CuitiñoCuitifioz,2, J. R. FranzeseFranzese11 CampoCampo4,, A. LapianaLapianal,, M. R. StreckerStrecker3 1 11CentroCentro de Investigaciones Geologicas,Geológicas, LaLa Plata,Plata, ArgentinaArgentina 1CICTERRA,CICTERRA, CONICET-CórdobaCONICET—Cördoba University, Córdoba,Cördoba, Argentina 2 22Inst.Inst. de Paleontologia y GeologíaGeologia de lala Patagonia, Puerto Madryn, 2IBIGEO,IBIGEO, Salta, Argentina 3 Argentina 3UniversityUniversity of Potsdam, Potsdam, Germany 44INGEIS-UBA,INGEIS-UBA, Buenos Aires, Argentina The RíoRio Negro River system constitutes aa drainagedrainage net-net- Foreland basins are sensitive recordersrecorders ofof spatiotempo-spatiotempo- work locatedIocated at the North Patagonian Region (39°S) that ralral variations ofof tectonictectonic andand climaticclimaticforcing forcingconcerning concerning connected the Andes with the Atlantic Ocean Oceanthrough through to processes associated with an approaching orogenic more than 600 km long. This corridor is one of the syssys-- to processes associated with an approaching orogenic front. The analysis of depositional systems,systems, andand paleo-paleo- tems that control the transference of materials to subsub-- flowsflows coupled coupled with withstratigraphic stratigraphicarrangement arrangementof the of the marine shelf, up to sink position, inin thethe ArgentinaArgentinabasin. basin. foreland deposits allows a fairly accurate assessment of During the Neogene this system was configuredconfigured inin aa sce-sce- foreland deposits allows a fairly accurate assessment of extra and intra basin deformational processes. The Cal- nario of profuse arc-explosive volcanism, contractional extra and intra basin deformational processes. The Cal- chaquíchaqui region, locatedIocated at ~24-26°S“24—26°S in the Eastern CordilCordil-- tilt-blocktiIt-block tectonics, tectonics, the thedevelopment developmentof ofthe theorogenic orogenic leraIera of NW Argentina, waswas onceonce partpart ofof thethe contiguouscontiguous rainrain shadow, as well as relativerelative seasea levellevel changes.changes. SeveralSeveral Andean foreland basin that evolved structurally into a fault-bounded exoreic–closed-basinsexoreic—closed-basins along the retroarcretroarc compartmentalized broken foreland during the Mio-PlioMio-Plio-- present infillinfiII thatthat recordrecord endogenousendogenous andand supersuperficialficial pro- pro- cene. This region is ideal for the study of the variations cesses occurred during the birth of the Andean chain, at inin tectonic, climatic andand sedimentarysedimentary processes,processes, duedue toto this latitude,Iatitude, asas wewe observeobserve itit today.today. EvenEven thoughthough Iarge-large- very well exposed of basin strata that contain a rich rere-- scale stratigraphic schemescheme andand holisticholisticgeological geologicalmod- mod- cord of floraflora andand vertebratevertebrate fossils,fossils, andand radiometricallyradiometrically els were performed to go forward in the understandunderstand-- datable volcanic ashes. We combined traditional sedi-sedi- inging of the system, until nownow areare absentabsent highhigh resolutionresolution mentological methods, U-Pb zircon and K-Ar geochrogeochro-- tectonic-volcano-climatic-eustatictectonic—volcano-climatic-eustatic models modelsthat thatallow allowto to nology, clay mineralogy, and geochemical weathering/ understand the sediment supply/accommodation spacespace climate indices with structural fieldfield datadata andand faultfault mod-mod- relationshiprelationship and andthe thereciprocal reciprocalstratigraphical stratigraphicaleffects effects eling to document the stratigraphic response of the for- along the whole system, in which the propagation of of eling to document the stratigraphic response of the former foreland deposits to basin fragmentation. The 14-9 the environmental signals be consider. Based on a mulmul-- mer foreland deposits to basin fragmentation. The 14-9 Ma Las Flechas Member (upper Angastaco Formation) tidisciplinary approach,approach, whichwhich includesincludes structural,structural, strati-strati- Ma Las Flechas Member (upper Angastaco Formation) and the 9-5 Ma Palo Pintado Formation comprise three graphic, geomorphological and geochronological dataset and the 9-5 Ma Palo Pintado Formation comprise three depositional systems systems and andtransitioned transitionedfrom fromgravelly gravelly together with previous surface and subsurface regionalregional braided, sandy braided to anastomosing-river systems. surveys, the analysis retroarc basin along RíoRI’o Negro syssys-- The slow transition from sandy to gravelly braided and tem isis carrying out. The preliminary resultsresults indicateindicate that The slow transition from sandy to gravelly braided and the rapidrapid transition fromfrom gravellygravelly toto anastomosinganastomosing revealreveal many contractional phasesphases relatedrelated toto outout ofof sequence,sequence, a prograding-retrograding pattern of ofthe thesedimentary sedimentary thick-skinned tectonics, progressed under explosive volvoI-- sequences highlighting an expansion surface. Thus, the canism which affected inin differentdifferentway waythe thesystem, system,acac- sequences highlighting an expansion surface. Thus, the regionalregional sedimentary succession recordingrecording the transitransi-- cording to the frequency order measured and location tion between betweenan anunrestricted unrestrictedto toa compartmentalized a compartmentalized along the system. At the foot of the Andes, preliminary 404o ABSTRACTS foreland isis representedrepresented by the sharp contact between and transport of organic carbon. Therefore, we aim to gravelly braided and the anastomosing that must have quantify thethe riverine-atmosphericriverine-atmospheric carboncarbon feedbackfeedback andand occurred by ca. 9 Ma. The new data suggest that fluvialfluvial how it is influencedinfluenced byby riverriver mobilitymobility andand bioproductivity.bioproductivity. depositional systemssystems changedchanged severalseveral timestimesin interms termsof of InIn order to trace back sources and composition ofof thethe locationlocation andand stylestyle andand werewere associatedassociated withwith pro-pro- andand ret-ret- riverineriverine organic carbon, we combine sampling of organic rogradingrograding gravel wedges, most likelyIikely in responseresponse to mulmul-- carbon bedload transport and riverine CO2C02 evasion with tiple faultfault reactivationsreactivationsof ofthe thebasement basementand andinversion inversionof of isotopicisotopic measurements. We quantify thethe organicorganic carboncarbon normal faults most likelyIikely in response to structural growth budget and constrain the fate of organic carbon in riverriver-- ofofthe the eastern basin-bounding ranges of the Eastern CorCor-- ineine transport to improveimprove our knowledge of the underlyunderly-- dillera. inging processes controlled by climate and tectonics. This work was supported FONCyT-PICT-1274FONCyT—PICT—1274 and CONICET-DFG:SuRfaceCONICET—DFG:SuRface processes, Tectonics & References Georesources:TheGeoresourceszThe Andean foreland basin of Argentina BATTIN, T. J. et al. The boundless carbon cycle. Nature Geoscience, v. (StRaTEGy).(StRaTEGy). 2, n. 9, p. 598-600, 2009. ISSN 1752-0894 1752-0908. CLARK, K. E. et al. Erosion of organic carbon from the Andes and its effects onon ecosystemecosystem carboncarbon dioxidedioxide balance.balance. JournalJournal ofof Geophysi-Geophysi- cal Research: Biogeosciences, v. 122, n. 3, p. 449-469, 2017. ISSN Approaching the organic carbon balance: 21698953. GRACE, J.; MALHI, Y. Carbon dioxide goes with the flow.flow. Nature,Nature, v.v. 416,416, InteractionInteraction ofof climate,climate, tectonics,tectonics, erosionerosion p. 1476-4687, 2002. and biota in riverine carbon transport and HILTON, R. G. Climate regulates the erosional carbon export from the terrestrial biosphere. Geomorphology, v. 277, p. 118-132,118—132, 2017. respiration atat thethe BermejoBermejo RiverRiver ISSNISSN 0169555X. HILTON, R. G.; GALY, A.; HOVIUS, N. Riverine particulate organicorganic car-car- S. DoschDoschl'z,1,2 N. Hoviusl'z,1,2 D. Sachse22 , N. Hovius , D. Sachse bon from an active mountainmountain belt:belt: ImportanceImportance ofof landslides.landslides. GlobalGlobal 1 1UniversityUniversity of Potsdam, Institute ofof EarthEarth andand EnvironmentalEnvironmental Science,Science, Biogeochemical Cycles, v. 22, n. 1, p. n/a-n/a, 2008. ISSN 08866236. Potsdam, Germany 22GermanGerman Research Centre for Geosciences, Geomorphology, Potsdam, Germany Along-strikeAIong-strike crustal strength gradient Riverine transport is now recognized as a major pathway accounts for the GPS velocity fieldfield inin thethe of terrestrial organic carbon (Battinet etal., al.,2009). 2009).This This Southern Andes: evidence from scaled transport can either contribute or consume significantsignificant amounts of atmospheric CO2C02 on geological time scalesscales analogue experiments and therefore impacts on both, the regional and global J. O. EisermannEisermann,, P. L. Göllner, U. Riller carbon budget (Hilton et al., 2008). Geomorphic and Universität Hamburg, Institut fürfür Geologie,Geologie, Hamburg,Hamburg, GermanyGermany climatic processesprocesses determinedetermine ifif organicorganic mattermatterserves servesas as source or sink of atmospheric CO2C02 (Clark et al., 2017). Dextral transpessive deformation inin thethe SouthernSouthern AndesAndes Further, tectonic and climate feedback and their interacinterac-- caused by oblique subduction of ofthe theNazca NazcaPlate Platebe-- be tion withwith geomorphologygeomorphology andand bioproductivitybioproductivitymay mayhave have lowlow the South American Plate isis widely believed to be major impacts on carbon cycling, though these are not focused on the 1200 km longlong Liquiñe-OfquiLiquine-qui Fault Zone yet well constrained (Hilton, 2017). To quantify thethe or-or- (LOFZ).(LOFZ). The GPS vector pattern of ofthe theSouthern SouthernAndes Andes ganic carbon budget, it is essential toto gathergather knowledgeknowledge seems to support this view. West of the LOFZ,LOFZ, GPS sites about the origin, age and relative importance importanceof ofthe the indicateindicate uniform NE-directed velocities co-linear co-linear with with riverineriverine organic carbon (Grace and Malhi,IVIalhi, 2002). Active the obliquity inin plate convergence on the order of sevsev-- mountain belts with high sediment supply may contribcontrib-- eral centimetres perper year,year, indicatingindicatingthat thatthe theplate plateinter- inter- ute to atmospheric composition throughthrough sequestrationsequestration face isis currently locked.locked. East of the LOFZ,LOFZ, GPS velocities of biospheric organic carbon on significantsignificant levellevel (Hilton(Hilton diminish abruptly to a few millimetres per year with a etetaL,2008) al., 2008). west-directed motion. AtAt 36°S,36°S, GPSGPS vectorsvectors changechange fromfrom The Bermejo River originates from the Andes MounMoun-- NE-directed to SE-directed velocities. TheThe observedobserved GPSGPS tains of north-western Argentina and andsouthern southernBolivia Bolivia velocity fieldfield is iswidely widelybelieved believedto be tocaused be causedby post- by post- and crosses significantsignificant elevationelevationand andclimatic climaticgradients. gradients. seismic mantle relaxation following following the the1960 1960Valdivia Valdivia ItsIts tributaries carry distinct loadsloads ofof sedimentsediment andand crosscross earthquake. different climaticclimaticconditions conditionsand andtherefore thereforeare aresupposed supposed We examine the cause for the observed upper-crustal to show different internalinternal dynamicsdynamics ofof in-streamin-stream coarsecoarse kinematics byby comparingcomparing thethe GPSGPS vectorvector fieldfieldwith withthe the organic matter. WeWe aimaim toto understandunderstand thethe rolerole andand con-con- displacement vector fieldsfields obtainedobtained fromfrom 3-D3-D digitaldigital im-im- trol of organic carbon bedload transport of the Bermejo age correlation of ofscaled scaledanalogue analogueexperiments experimentsusing using River. By using bedload sampling techniques, we invesinves-- the MultiBox.IVIultiBox. InIn particular,particular,we weconsider considerthe thein influencefluence of of tigate thethe drivingdriving factorsfactors ofof thisthis transporttransport andand howhow cli-cli- orogen-parallel variations in inthe thestrength strengthof ofthe theupper upper mate and geomorphology govern it. Further, we want to model crustal on the surface displacement vector field.field. constrain which processes occur during the mobilization For this purpose, two-layer models are designed using a ABSTRACTS 41

3 cm thick layerIayer of a silicone-corundum mixturemodelmixturemodel-- (Salta(Salta province). Geological studies inin progress inin the lingIing the viscous lowerIower crust and variable thicknesses of southern part of the valleyvaIIey focused on the Quaternary quartz sand portraying theMohr-Coulomb rheology of morphostructures and its sedimentary infillinfill revealsreveals evi-evi- the brittle upperupper crust.crust. dence (synsedimentary deformation) forfor widespreadwidespread pa-pa- The MultiBoxconsists ofof twotwo halves,halves, eacheach ofwhichof which con-con- leoseismicleoseismic activity duringduring thethe LateLate Pleistocene-Holocene.Pleistocene-Holocene. tain a piston, whereby one halve isis mobile and moves At the same time, thethe recordsrecords ofof aa 13-months-running13-months-running relativerelative toto thethe fixedfixedone oneparallel parallelto tothe thebox boxmidline. midline.Each Each seismic network in the northern part of this valley, rere-- horizontal piston is fittedfitted with witha ashort shortvertical verticalL-shaped L-shaped flectflect the theseismic seismicactivity activityin real-time. in real-time.Combining Combiningboth both baseplate. This piston geometry carries a portion ofof thethe geophysical and geological studies will be suitable for overlaying silicone and sand layers and, thus, avoids unun-- unraveling the most recent deformation history historyin inthis this wanted localization ofof deformationdeformationat atthe thepistons. pistons.A A20 20 part of the Andean deformation frontfront thatthat isis character-character- cm wide area between the L-shaped pistons, in which izedized by irregularlyirregularly distributed evidence of Quaternary to material is detached from the base plate of the box alal-- recentrecent deformation throughoutthroughout thethe EasternEastern Cordillera.Cordillera. InIn lowsIows for evenly distributed deformation andand representsrepresents this context, the Medeiros anticline atat thethe northernnorthern partpart the actual Andean mountain range.range. of the Lerma valley, is interpreted as an active structurestructure that must be deeply investigated due to its closeness to Normal t0 Strang that must be deeply investigated due to its closeness to Riff}; ‚r- ‚ .. . Salta cityCity with more than 700,000 inhabitants. fiflflfiflx ‚.J „ ‚ . This work was supported by PUE IBIGEOIBIGEO (CONICET),(CONICET), _ fifißfiflflx; ‚ _ . .

fififlx’flflx, - ‚ . . StRATEGy program (DFG-CONICET), CIUNSA 2336 and

' flflfjflx'J-I'- _ . _ _ JSteigrti’ PICT—1928 (ANPCyT, Argentina). Owners from the Lerma flx‘ajflw’fifl ‚ . . . _ PICT-1928 (ANPCyT, Argentina). Owners from the Lerma ValleyVaIIey are thanked for the permissions to host the seisseis--

‚fiflßflfifig _ , ‚ . . “H Hßßfläflfi _ _ _ . _ mic stations duringduring thethe 2017-20182017-2018 period.period.

1|]

ﬂxäle'ﬂxr—v,’ _ ‚_ Grädierltl.

KFHP.JH*A_.'_ _ _ l

. fipflßffißg- _ ‚ . 1|

fißflxfif—ra ‚. '\ ‚ßßßflflflß, InsightsInsights on the lateIate Cenozoic evolution ofof thethe . fißfiflfifif- .. 7 fififlflfifiafl _ ‚ Rio Grande foreland basin in South Mendoza - " HffiflßHHJJ _ „ ’I .hlürlnäl.

Hwflflfiflä ._ _ . ’I . province, Argentina

fwfiflfi _. . ‚ J l 1,2 3,4 2 1 ' R. FealFeall'z,, M. GhiglioneGhiglione3'4,, R. OndrakOndrakz,, M. StreckerStreckerl,, F. TapiaTapia3'5,3,5, L.L. GiambiagiGiambiagi66 1 Analogue modelling results suggest that orogen-parorogen-par-- 1PotsdamPotsdam Universität, Erd- und Umweltwissenschaften, Potsdam,Potsdam, Germany allel strike-slip faults do not account for the GPS vector 22DeutscheDeutsche GeoForschungsZentrum, Potsdam, Germany fieldfield inin aa compression-dominatedcompression-dominated transpressivetranspressive setting,setting, 33BuenosBuenos Aires University, Geology, Buenos Aires, Argentina such as in the Southern Andes. The experiments point 44IDEAN—CONICET,IDEAN-CONICET, Buenos Aires, Argentina 5 to the importanceimportance of the development of rhomb-shapedrhomb-shaped 5LAMOGE-CONICET,LAMOGE-CONICET, Buenos Aires, Argentina 66IANIGLAIANIGLA - CONICET, Mendoza, Argentina structural and topographic domains bound by oblique rere-- This study presents firstfirst resultsresults toto reconstructreconstruct deforma-deforma- verse faults in accomplishing orogen-scale transpression. tion andand exhumationexhumationofthe of theAndean Andeanmountain mountainranges rangesbe- be- The orogen-parallel change in upper crustal-strengthcrustal—strength is tween 34°S and 39°S from latelate Cenozoic to the present. conducive for the development of such domains and The evolution ofof thethe AndesAndes cancan bebe deciphereddeciphered throughthrough can explain the regional variation inin thethe GPSGPS vectorvector field.field. the analysis of its adjacent depocenters, where synorosynoro-- Comparison with fieldfield observation, observation,geodetic geodeticdata dataand and genic deposits and growing strata are found. These dede-- the GPS vector fieldfield supportsupport thethe modelmodel observations.observations. posits record phases of rock uplift causedcaused byby shorteningshortening and exhumation oror extension.extension.

We investigateinvestigate thethe RioRío GrandeGrande forelandforeland basin,basin, whichwhich Quaternary deformation atat thethe LermaLerma Valley,Valley, relatesrelates to the generation oftheof the MalargüeMalargüe foldfold andand thrustthrust Northwestern Argentina belt. The basin is located in the northern part of the Neuquina basin. Recently, the area has gained economeconom-- L. I. ElíasEliasl,1, E. J. M. Criado SuttiSuttil,1, C. Montero LopezLopezl,1, V. H. icic interestinterest from the oil industryindustry and the exploration ofof GarcíaGarciaz'3,2,3, F.F. HongnHongnl,1, F. KrügerKrügerz,2, M. StreckerStrecker22 unconventional reservoirs.reservoirs. Primarily,Primarily, thisthis forelandforeland basinbasin 11IBIGEO,IBIGEO, Universidad Nacional de Salta-CONICET,Salta—CONICET, Salta, Argentina 2 was filled with epiclastic, volcaniclastic, and volcanic de- 2InstitutInstitut fürfür Geowissenschaften,Geowissenschaften,Universität UniversitätPotsdam, Potsdam,Potsdam, Potsdam, was filled with epiclastic, volcaniclastic, and volcanic de- Germany posits, as wellweII as fluvialfluvial andand lakelake systemsystem sediments.sediments. Up-Up- 33La.Te.La.Te. ANDES, GeoMap-CONICET,GeoMap—CONICET, Salta, Argentina dated seismic information andand boreholeborehole datadata fromfrom thethe subsurface shows that Pliocene and Quaternary deposits Northwestern Argentina isis aa seismicallyseismically active,active,intraplate intraplate are folded by a series of east-vergent thrusts. This correcorre-- regionregion on the back-arc of the Central Andes. SeveralSeveraI inin-- sponds to the firstfirst evidenceevidence ofof recentrecent deformationdeformationthat that termontane valleys recordrecord paleo- and historical seismic shows the integration of ofthe thelate lateCenozoic Cenozoicdeposits depositsin in events, as is the Lerma ValleyVaIIey in the Eastern Cordillera the accretionary wedgewedge ofof thethe MalargüeMalargüe foldfold andand thrustthrust 42 ABSTRACTS belt construction. emphasis on shortening rates in the Cafayate intermonintermon-- We collected new data during a fieldfield campaigncampaign toto buildbuild tane basin of the Eastern Cordillera and compare them stratigraphic columnscolumns forfor aa regionalregional correlationcorrelationand andcom- com- with the GPS surface velocity field.field. bination with withavailable availableseismic seismicdata. data.We Wetook tooksamples samples

"1.5:; „3&3? A I _. r i5 P I5 '«I I; 5'355? . _ l_ from key places for a better coveragecoverage ofof thethe area.area. InIn ad-ad- - m n

-_r .'- ICI I.‘ .:_’ dition, samplessamples fromfrom boreholeborehole havehave beenbeen acquiredacquired andand —7=-I._.- |"'-' ._ will be analyzed to integrate the outcrop and subsurface :_

‚- / 1'1.

_ F - .‚r' information.information. . ;=I_.| l"r Furthermore, to better constrain constrain the theLate LateCenozoic Cenozoic ..... _‚ " „Ing.'Il I f

tecto-sedimentary evolution of ofthe thearea, area,we will we willuse use {1" three different methodologies. methodologies.First, First,sedimentation sedimentation ratesrates and depositional agesages willwill bebe characterizedcharacterized byby cor-cor- . r. i. . arw‘iils' IHI relatingrelating outcropoutcrop samplessamples toto thethe interpretedinterpreted seismicseismic hori-hori- “l J:- 1: J. D 3 C‘i 11

zons, using U-Pb dating forfor minimumminimum depositionaldepositionalages. ages. [lt Second, this analysis will be complemented with petropetro--

-EIE'».Ia1-lc-n I- nslnr I.:rrr.-|I:.-r.1' graphic studies in sandstone thin sections forfor aa completecomplete Pa-ru'aym Hangar 'IIIIEII EÜD SÜD 4|3|51 EIII provenance study. Third, we started to work on the tectec-- 25mm 2-!-.-1Ibnr.=a r.,..=lv.vrn

tonic reconstructionreconstruction of ofthe thestudy studyarea areausing usingavailable available [mm-w; and newly data to integrate the last deformation phasephase

: with the tectonics and sedimentation knownknown inin thethe area.area. wem-311.-

Finally, we will determine periods of sediment bypass 100 20C! 3.00 düU 500 [100 FÜII F'mjecten from the Andean foreland basin towards the Colorado Dintance I‘rnm Ine Irench [km] h‚|h1.wpho-Qec-!ogit‚.1lp'o'- nce oi Ihe tt-nlral Ein-395 IjEC. r'I SF‘ am: SEIS: E asmrn Corü-i!era. Nonhern Sierras F‘arr'geanas a '1I:I offshore basin basinby bycomparing comparingperiods periodsof sedimentation of sedimentation Siinlil Eßllmru H'‚1:I1:rn_ rlffil.)l'.::|.'.'l'.-l‘:‚':| E'l_I Dlhtrilriitimit n:‘..' Ctiillcrrrmry Multi-i I|1 Ihn ::n::lur-'| fc:re:l;||1|:l‚ Lttrl'uxieed lag I.'.'."|:-'.:| 11|. .'|I _ HEINE. The while square shüwfitl‘fi sind]; area C'I “fühle 'wEw {JEN'PII | ülll'IE Mix-2123156645: liL‘IlIil nfüjettfiü umaendmularml'm and non-deposition or orerosion erosionin inthe thedifferent differentbasins basins elrike üitne rr‘ann EastC-ydlllera slrucmrea. an: an Lot: Swath prolnle L-J'Jhrn winde. The Eure-He shows II'| red the rr'a-n velocity ol nachel:htsfnlnnnsG‘-1"Innüelanzolramthlrlronrh .‘-.'::1.:'.ra'.tr4_r Uülüull'a. ‘ _. ‘ . ‚r. EM: from the source regionregion of sediments inin the mountains to Our new structural data shows that the Quaternary dede-- their sink regionregion inin the Atlantic Ocean.Ocean. InIn thisthis approach,approach, formation inin thethe CafayateCafayate basinbasin isis mainlymainly locatedlocated insideinside we will relate the Central Andes growth to sedimentasedimenta-- the valley ratherrather than along the principal range-boundrange-bound-- tion inin thethe forelandforeland andand offshoreoffshorebasins, basins,in ina a„Source „Sourceto to inging faults that delimit the basin. We inferinfer that faults and Sink“Sink” concept, to elucidate the interaction betweenbetween thethe associated folds are linked with a thin-skinned detachdetach-- Andean uplift, erosion,erosion, sedimentsediment transporttransport andand deposi-deposi- ment horizon in the Quaternary valley fill.fill. TheThe strikestrike andand tion inin thethe ArgentinianArgentinianoffshore. offshore. vergence of the Quaternary faults are very similar to the This project is supported by the International ResearchResearch basin-bounding structures. Shortening rates based on Training Group StRATEGy, funded by the German Science dated lacustrine and alluvial-fanalluviaI-fan sediments range from Foundation.Foundafion. 0.5 to 5.66 mm/yr. The obtained velocity fieldfield proprofilefile for for NW Argentina revealsreveals thatthat velocitiesvelocitiesdecrease decreasegradually gradually from west to east. Taken together, our Quaternary shortshort-- Late Pleistocene to Recent shortening rates ening rates spanning different timetimescales scalessuggest suggestthat that inin the broken foreland of NW Argentina: NewNew deformation inin thethe EasternEastern CordilleraCordillera isis accommodatedaccommodated observations fromfrom thethe intermontaneintermontane CafayateCafayate by widely distributed faults with variable shortening Valley, 26° S lat.Iat. rates,rates, pointing toto strainstrain releaserelease throughthrough numerousnumerous minorminor structures. S. FigueroaFigueroal'z,1,2, J. WeissWeissl,1, F. HongnHongnz,2, L.L. I.I. ElíasEllaSZ‚2, L. EscalanEscalan-- 1,2 1,2 1 tetel'z,, G. ArandaArandal'z,, M. R. StreckerStrecker1 Reference 11PotsdamPotsdam University, Institute ofof earthearth andand enviromentalenviromental sciences,sciences, Strecker, M., et al., 2012. Structural, geomorphic, and depositional Potsdam, Germany characteristics ofof contiguouscontiguousand andbroken brokenforeland forelandbasins: basins:examples examples 22InstitutoInstituto dede BioBio yy geocienciasgeociencias deldel NOA,NOA, Geologia,Geología, Salta,Salta, ArgentinaArgentina from the eastern flanksflanks ofof thethe centralcentral AndesAndes inin BoliviaBolivia andand NWNW Ar—Ar- gentina. TectonicsTectonics ofof sedimentarysedimentary basins:basins: RecentRecent advances,advances, 508—521.508-521. InIn thick-skinned broken forelands, localizedlocalized uplifts typi-typically occur in areas where retroarc convergence is mainly accommodated along re-activated high-anglehigh-angle structures.structures. Rupture directivity andand stressstress dropdrop estimationestimation This reactivation typically typicallyoccurs occursin a inhighly a highlydisparate disparate at the Northern Chilean subduction zone.zone. manner, in time and andin inspace space(Strecker (Streckeret al; et 2012). al; 2012). These features also characterize the foreland of the CenCen-- J. FoleskyFoleskyl,1, J. RakauRakaul,1, J. KummerowKummerowl,1, S. A. ShapiroShapiro11 tral Andes of NW Argentina. InIn thisthis study,study, wewe evaluateevaluate 11FreieFreie Universität Berlin, Geophysik, Berlin, Germany how Quaternary deformation inin thethe brokenbroken forelandforeland isis accommodated on millennial time scales.scales. WeWe assessassess thethe The Northern Chilean subduction zonezone isis aa highlyhighly activeactive latelate Pleistocene to Recent tectonic evolution withwith specialspecial regionregion of intense seismic activity. ForFor manymany yearsyears itit hashas been well monitored by the Integrated Plate Boundary ABSTRACTS 43

Observatory Chile (IPOC) network. In this study we anaana-- on October 30, 2015, which was thoroughly monitored lyzelyze seismicity from a time periodperiod ofof 20082008 toto 20162016 usingusing by cameras, a seismic network, and gas (SO2(502 and CO2)C02) the broadband recordingsrecordings (100Hz(100Hz sampling rate)rate) of the and temperature sensors. IPOCIPOC to inferinfer earthquake rupturerupture directivity and andstress stress Prior to the eruption, we we retrospectively retrospectivelyidenti identifiedfied drops based on an empirical Green“sGreen"s function (EGF)(EGF) ap-ap- unrest manifestingmanifesting> asas aa gradualgradual increaseincrease inin thethe numbernumber proach. of long-period (LP) seismic events in 2014, indicating anan The elegance of using this approach lies in the low augmented level of activity atat thethe volcano.volcano. Additionally,Additionally, number of assumptions necessary necessaryfor forits itsapplication. application. SO2502 fluxflux and andthermal thermalanomalies anomalieswere weredetected detectedbefore before However, the inevitable condition is isthe theavailability availabilityof of the eruption. Then,Then, ourour weatherweather stationstationreported reporteda apre- pre- EGFs for an event of interest. Using a cross correlation cipitation event,event, followedfollowed byby changeschanges inin thethe brightnessbrightness detector to identify highly highlysimilar similarwaveforms waveformsbetween between of the permanent volcanic plume and (10 days later) events we obtain EGFs for over 700 events. Out0ut of these by the sudden volcanic explosion. The multidisciplinary we findfind clear clearunilateral unilateraldirection directionsignatures signaturesfor 293 for 293 data exhibited short-term variations associatedassociated withwith thethe events. The ensemble of directivity solutionssolutionsdisplays displaysa a explosion, including (1) an abrupt eruption onset onsetthat that strong preference of rupture orientations sub-parallelsub-parallel toto was seismically identifiedidentified in inthe the1-10 1-10Hz Hzfrequency frequencyband, band, the convergence vector of the Nazca plate relativerelative toto thethe (2)(2) the detection ofof aa 1.71.7 kmkm highhigh white-greywhite-grey eruptioneruption South-American plate. The preferred rupture direction isis column in camera images, and (3) a pronounced spike in down-dip. sulfur dioxide (SO2)(502) emission rates reachingreachinxg> 55 kg sec- Alongside the rupture directivity estimationestimationwe wecom- com- 1 during the main pulse of the eruption as asmeasured measured pute earthquake stress drops for the same data set using by a mini-DOAS scanner. Continuous C02CO2 gasgas andand tem-tem- the spectral ratioratio methodmethod whichwhich isis alsoalso basedbased onon suitablesuitable perature measurements conducted at a fumarole on the EGFs. We test an integration ofof thethe informationinformationobtained obtained southern rim of the Lascar crater revealedrevealed a pronounced by the directivity analysis analysisinto intothe thestress stressdrop dropestima- -estima change in the trend of the relationship betweenbetween thethe car-car- tion to to reduce reduce uncertainties. uncertainties.The Theresulting resultingstress stressdrop drop bon dioxide (CO2)(C02) mixingmixing> ratio andand thethe gasgas outletoutlet tem-tem- estimates indicateindicate thatthat thethe highhigh slipslip regionsregions ofof thethe 20142014 perature; we believe that this change was associated Mw8.1I\/Iw8.1lquique Iquique megathrust event are dominated by lowlow-- with the prior precipitation event.event. AnAn increasedincreased thermalthermal er than average stress drops, while patches of events at anomaly inside the active cratercrater observedobserved throughthrough Sen-Sen- the outline of the slip contour show higher than average tinel-2 imagesimages andand dronedrone overoverflightsflights performed performedafter afterthe the stress drops. steam-driven explosion revealedrevealed the presence of a fracfrac-- Based on our results we speculate that the reason for ture ~50“'50 metres inin diameter truncatingtruncatinrg> the thedome domeand and the dominatingdominatinxg> rupturerupture directiondirectioncould couldbe beconnected connectedto to locatedlocated deep insideinside the active crater, crater,which whichcoincides coincides the influenceinfluence ofof aa materialmaterial contrastcontrast atat thethe subductionsubductionin- in- well with the location ofof thethe thermalthermal anomaly.anomaly. Altogeth-Altogeth- terface and we hypothesize that the areas of high stress er, these observations leadlead usus toto inferinfer thatthat aa lavalava domedome drop could constitute barriersbarriers whichwhich maymay havehave conconfinedfined was present and subjected to coolingcooling> and inhibited dede-- the megathrust event rupturerupture area. gassing. We conjecture that a precipitation eventevent ledled toto the short-term build-up of pressure inside the shallow dome that eventually triggered a vent-clearingvent-clearing> phreatic Processes culminating inin thethe 20152015 phreaticphreatic explosion. This study shows the chronology of events explosion at Lascar volcano, Chile, monitored culminating inin aa steam-drivensteam-driven explosionexplosion butbut alsoalso dem-demonstrates that phreatic explosions explosions are aredif ficultdifficultto fore- to- fore by multiparametric data by multiparametric data cast, even if the volcano is thoroughly monitored; these A. GaeteGaetel,1, T. WalterWalter1‚1, S. BredemeyerBredemeyerl,1, M. ZimmerZimmerl,1, C. findingsfindings alsoalso emphasizeemphasize whywhy ascendinrg>ascending toto thethe summitssummits KujawaKujawal,1, L. FrancoFrancoz,2, J. San MartinIVIartin3,3, C. Bucarey ParraParra22 of Lascar and similar volcanoes is hazardous, particularly 11GFZGFZ German Research Centre for Geosciences, Potsdam, Germany after considerableconsiderable rainfall.rainfall. 22ServicioServicio Nacional de GeologíaGeologia y MineríaIVIineria (SERNAGEOMIN), ObservatoObservato-- riorio VolcanológicoVolcanologico de LosLos Andes del Sur (OVDAS), Temuco, Chile 33UniversidadUniversidad de la Frontera, Physics Science Department, Temuco, Chile Full-waveformFuII-waveform inversion for seismic velocity and moment tensor solutions beneathbeneath NorthNorth Small steam-driven volcanic explosions are common Chile at volcanoes worldwide but are rarely documented or monitored; therefore, these events still put putresidents residents Y. GaoGaol,1, F. TilmannTilmannl,1, D. P. van HerwaardenHerwaarden2‚2, S. and tourists at risk every year. Steam-driven explosions ThrastarsonThrastarsonz,2, A. FichtnerFichtner22 also occur frequently (once every 2-5 years on average) 11GFZGFZ German Research Centre for Geosciences, 2.4 Seismology, PotsPots-- at Lascar volcano, Chile, where they are often spontane-spontane- dam, Germany 2 ous and lack any identifiableidentifiable precursor precursoractivity. activity.Here, Here,for for 2SwissSwiss Federal Institute ofof TechnologyTechnology (ETH)(ETH) inin Zurich,Zurich, DepartmentDepartment ofof Earth Sciences, Zürich, Switzerland the firstfirst timetimeat atLascar, Lascar,we wedescribe describethe theprocesses processesculmi- culmi- nating inin suchsuch aa suddensudden volcanicvolcanic explosionexplosion thatthat occurredoccurred 44 ABSTRACTS

We present a new seismic tomography model includinclud-- tems defineddefined the thePatagonian PatagonianBroken BrokenForeland, Foreland,characcharac- inging radialradial anisotropy based on Multiscale Full FullSeismic Seismic terized by a series of Neogene basins distributed along Waveform Inversion for the crustal and upper-mantle the reatroarcreatroarc system. Several interpretationsinterpretations aboutabout thethe structure beneath northern Chile, which is a part of the origin of this tectonic scenario have been devised in rere-- Nazca-South America Plate boundary known for frequent cent years. On the one hand, a partitioningof ofdeforma- deforma- megathrust earthquakes and volcanos. The forward tion isis proposedproposed asas thethe mainmain controlcontrol inin thethe conconfigurationfiguration and adjoint simulationSimulation basedbased onon aa 3D3D modelmodel areare accom-accom- of the main cordillera and the foreland zone as a result plished with Salvus, which is a suite of spectral-element of oblique convergence between Nazca y South America method solver of the seismic wave equation andand ofof itsits plates.pIates. Contrarily, reactivation of ofPaleozoic Paleozoicand andIVIesozoic Mesozoic adjoint, working in 2D and 3D tetrahedral, hexahedral, crustal anisotropies was suggested to explain the configconfig-- quadrilateral and triangular meshes. We perform the uration ofof thick-skinned-dominatedthick-skinned-dominated tectonicstectonics duringduring thethe inversioninversion runningrunning on the Piz Daint, hosted by Swiss Na- lastlast contractional AndeanAndean orogenyorogeny phase.phase. Nevertheless,Nevertheless, tional ComputingComputingCentre Centreand andinvert invertwaveforms waveformsfrom from78 78 detailed studies that tested the relationship betweenbetween thethe events which are carefully selected for good coverage of Paleozoic and MesozoicIVIesozoic crustal weaknesses with Andean the study regionregion and depth range,range, yielding in total 6854 structures have not yet been developed. This uncertainty event-station pairs, pairs,74% 74%of ofwhich whichhave haveeffective effectivetime time determines an ambiguous tectonic framework in which windows for full-waveform inversion. In order to mitimiti-- kinematic analysisanalysis isis absent.absent. gate the risk of convergence towards localIocal minima, we The SañicóSanico Massif presents uplifted basementbasement blocksblocks divide the whole inversion procedures into three differdiffer-- with well-exposed fault zones associated with a thin rere-- ent time-period stagesstages (40-80(40-80 s,s, 30-8030-80 ss andand 20-8020-80 s).s). TheThe cord of intermontane basin infill.infill. TheThe workwork waswas carriedcarried starting modelmodel isis retrievedretrieved fromfrom thethe CollaborativeCollaborativeSeis- Seis- out based on morphostructural and microstructural mic Earth Model (Fichtner et al., 2018) and we proceed studies of pre-existing basementbasement fabricsfabrics andand thethe AndeanAndean the inversion from lowerIower to higher frequency bands. We structures. The basement fabrics (regional metamorphic take advantage ofofthe the adjoint methodology coupled with foliation andand ductileductileshear shearzones) zones)present presenta aclose closelocation location conjugate-gradient and L-BFGSL-BFGS optimizationscheme schemeto to and geometric relationship withwith allall extensionalextensional IVIesozoicMesozoic update the seismic velocity model. Through full-wavefull—wave-- and Andean faults. Kinematic resultsresults ofof small-scalesmall-scale faultsfaults form inversion,inversion, we effectivelyimprove improvethe theresolution resolutionof of show heterogeneous patterns duedue toto thethe interactioninteractionof of the current model. The most conspicuous feature is the pre-existing fabrics fabrics reactivation, reactivation,multiple multipledeformations deformations strong radiallyradially anisotropy for S wave velocity: the Vsvs and subgroups of new faults. and Vsh within the subducted slab demonstrate an obviobvi-- The results indicate a three-dimensional deformation ous different strengthstrength andand shape.shape. model in the foreland zone, fundamentally controlled Meanwhile, in order to alleviate the effect ofof inaccura-inaccura- by the activationof ofPaleozoic Paleozoicbasement basementfabrics fabricsand andtec- tec- cy of earthquake source parameters, in particular depth,depth, tonic inversioninversion of MesozoicIVIesozoic extensional faults. InIn turn, on the seismic velocity model inversion and to update the the small-scale structures present a heterogeneous disdis-- moment tensor catalogue, we implementeded a seismic tribution, whichwhich couldcould bebe linkedlinked toto thethe responseresponse ofof con-con- source inversion workflowworkflow basedbased onon Greens”Greens“ FunctionsFunctions vergence direction. AlthoughAlthough thethe resultsresults demonstratedemonstrate aa calculated for 1-D1—D and 3-D seismic velocity models. We strong control of pre-existing weaknesses, weaknesses, mechanical mechanical take a consecutive wayway toto updateupdate ourour Greens”Greens“ functionsfunctions models of deformation that thatreproduce reproducethe theobserved observed based on the updated Seismic velocity model from our kinematic model, model,can canprovide provideinsight insightinto intothe natural the natural adjoint inversion combined with the high-frequency conditions ofof deformation.deformation.Hence, Hence,analogue analoguemodels modelswill will analytic Greens”Greens“ functionsfunctionsbased basedon on1-D 1-Dmodel modelfor forincor- incor- representrepresent a functional tool tool for for testing testingthe thein fluence influenceof of porating moremore bodybody wavewave phases.phases. structural inheritance as well as, the progressive defordefor-- mation undergoneundergone duringduring differentdifferenttectonic tectonicconditions. conditions.

Kinematically heterogeneousheterogeneous faultingfaultingin in the configurationconfiguration of ofNeogene NeogenePatagonian Patagonian Slab hydration: combiningcombining constraintsconstraints foreland basins: activationof ofpre-existing pre-existing from oceanic plate structure and intraslab fabrics and strain partitioning seismicity 1 2 M. GarcíaGarcial,1, M. LopezLopezl,1, J. BucherBucherl,1, L.L. D‘EliaD’Elial,1, A. BilmesBilmesz,2, J. J. GeersenGeersenl,, C. SipplSippI2 R. FranzeseFranzese11 11GEOMARGEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Kiel, Germany 22InstituteInstitute ofof Geophysics,Geophysics, CzechCzech AcademyAcademy ofof Sciences,Sciences, Prague,Prague, CzechCzech 11CentroCentro de Investigaciones Geolögicas,Geológicas, LaLa Plata,Plata, ArgentinaArgentina RepublicRepubHc 22InstitutoInstituto dede PaleontologiaPaleontología yy GeologiaGeología dede lala PatagoniaPatagonia ,, PuertoPuerto Madryn, Argentina Most subduction-zones exhibit exhibit two twobands bandsof ofintraslab intraslab The retroarc of the North Patagonian Andes was configconfig-- seismicity, the lowerIower one situated at 20-40 km below ured by the uplift ofof basementbasement blocksblocks Iimitedlimited byby faultsfaults the plate-interface within the subducting oceanicoceanic man-man- strongly oblique to the Andean chain. These fault syssys-- tle. This band, which isis usually referredreferred to as the lowerIower ABSTRACTS 45 seismicity plane, runs parallel to the plate-interface and insideinside levelslevels of mechanical anisotropies. These orogenic isis characterized by ratherrather lowlow magnitude earthquakes wedges thicken towards the hinterland, reaching depths showing downdip-extensive mechanisms. The intensity locatedlocated inin the brittle-ductiletransition. transition.At Atan anorogenic orogenic of lower-plane seismicity often varies varies greatly greatlyalong alonga a scale, these shear zones are not controlled by frictional single subduction zone,zone, andand cancan bebe completelycompletely absentabsent inin sliding, but rather by temperature, composition, strain strain some areas. To date, there is no single accepted physiphysi-- rate,rate, and the stress field.field. WhileWhile thethe synergiessynergies betweenbetween cal model which explains the mechanism that drives crustal deformation, exhumation exhumationand andsedimentation sedimentation earthquake occurrence within the lower-plane as well processes are well-known to a firstfirst order,order, itit isis challeng-challeng- as observed spatial variationsvariationsover overrelatively relativelyshort shortdis- dis- inging to evaluate the interplayinterplay between constructive deepdeep tances. One hypothesis that has been put forward for exex-- mechanisms and the in-situ stress field.field. TwoTwo outstandingoutstanding planation ofof thethe existenceexistence ofof thethe lowerlower seismicityseismicity planeplane questions inin thethe studystudy ofof orogenicorogenic processesprocesses are:are: HowHow isis that itit resultsresults from serpentinite dehydrationdehydrationalong alongthe the does shallow structures in the foreland fold-and-thrust 600–650600—650IC∘C isotherm in the oceanic mantle. SerpentiniSerpentini-- belt connect with ones in the hinterland under an evolvevolv-- zation possiblypossibly occursoccurs inin thethe outerouter riserise regionregion ofof oceanicoceanic inging and changing stress field?field? How Howlong longcan cana detach- a detach- trenches by water which infiltratesinfiltrates thethe oceanicoceanic crustcrust andand ment remain active duringduring anan orogenicorogenic event?event? mantle along bending-related faults. If this hypothesis To answer these questions, wewe useuse thethe CentralCentral AndesAndes isis correct, the intensityintensity of lower-planelower-plane seismicity should as a natural laboratory and construct kinematic-thermokinematic-thermo-- correlate with the amount and penetration depthdepth ofof wa-wa- mechanical models for the last episode of crustal defordefor-- ter inin the slab, and thus with the intensity and the depth mation andand thickening.thickening. OurOur modelsmodels showshow thatthat aa shallow,shallow, extent of bending-relatedbending—related faulting. ToTo testtest this,this, wewe cor-cor- sub-horizontal megadetachment locatedlocated at the shallowshallow-- relaterelate the occurrence and intensity of lower-planelower-plane seisseis-- est brittle-ductiletransition transitionconcentrates concentratesmost mostof the of the micity in the North Chilean, Japan Trench, and Central horizontal crustal shortening between the fore-arc and American subduction-zones withwith oceanic-plateoceanic-plate faultfault pat-pat- the South American craton. We propose that, locally,locally, terns in the outer riserise and trench regions.regions. To analyze the a threshold in horizontal shortening and crustal thickthick-- intensityintensity of lower-planelower-plane seismicity, we compute the ratioratio ening is achieved when the buoyancy force equals the between event numbers in the rather homogeneously horizontal force, and at this point, the mega-detachment active upper upperseismicity seismicityplane planeand andthe thelower lowerplane planein in deactivates, and andthe thecrustal crustalroot rootwidens widenseastwards, eastwards,in in along-strike distance bins. With this approach, we avoid concert with ductile deformationdeformationin inthe thelower lowercrust crustand and the issueissue of variable earthquake catalog completeness the generation ofof aa newnew mega-detachment.mega-detachment. OurOur work-work- that would complicate the analysis if absolute event inging hypothesis isis that, by studying changes inin the paleo- numbers were used. Fault patterns areare derivedderived fromfrom aa stress fieldsfields alongalong thethe arcarc region,region, togethertogether withwith thethe tim-tim- compilation of ofmore morethan than100 100ship-based ship-basedbathymetric bathymetric inging of uplift and andexhumation exhumationof the of morpho-structural the morpho-structural surveys complemented by published seismic reflectionreflection units across the transects, we can constrain the timing ofof lineslines which runrun perpendicular to the individualindividual margins. activation/deactivationof theof thedetachments detachmentsresponsible responsible First results point towards a higher rate of lower-plane for the Andean deformation. WeWe suggestsuggest thatthat aa changechange seismicity in regions where plate-bending is expressed in inin the stress fieldfield fromfrom compressioncompression toto strike-slipstrike-slip regimeregime well-developed horst-and-graben structures as well as in can be used as a proxy for the deactivationof ofa amega- mega- regionsregions where topographic features on the oceanic-plate detachment. enter the subduction-zone. FutureFuture workwork willwill furtherfurther ex-ex- For this purpose, the temporal and spatial stressstress fieldfield plore this possible correlation. variations isis usedused asas aa parameterparameter crucialcrucial toto understand-understand- inging the relationshiprelationship betweenbetween deepdeep andand shallowshallow crustalcrustal deformation InterplayInterplay between constructive deepdeep mechanisms building the Central Andes and the stress fieldfield InterplayInterplay between salt tectonics and gravitational extensionextension tectonicstectonics inin thethe L. GiambiagiGiambiagil,1, S. SpagnottoSpagnottoz,2, A. TassaraTassara3,3, J. SurianoSurianol,1, J. Sureste Basin, Mexico Mescua|VIescua1,1, A. LossadaLossada4,4, M. BarrionuevoBarrionuevol,1, J. JulveJulve33 1 2 3 11CONICE'I',CONICET, IANIGLA, CCT MENDOZA, Mendoza,IVIendoza, Argentina M. GibaGibal,, M. MohrIVIohrZ,, C. SchneiderSchneider3 2 2UniversidadUniversidad Nacional de San Luis, San Luis, Argentina 11WintershallWintershall Dea Deutschland AG, Exploration Mexico,Mexico, Hamburg,Hamburg, 3 3UniversidadUniversidad de Concepción,Concepciön, Concepción,Concepcion, Chile Germany 4 4UniversidadUniversidad de Buenos Aires, Buenos Aires, Argentina 22WintershallWintershall Dea Deutschland AG, Hamburg, Germany 33WietzeWietze Lab, Wintershall Dea Deutschland AG, Wietze, Germany Both in continental collisioncollision andand subduction-relatedsubduction-relatedoro- oro- gens, different kinds kindsof ofmega-detachments mega-detachmentshave havebeen been The structural evolution of ofsalt saltdiapirs diapirsis a iskey aaspect key aspect proposed to explain the horizontal shortening, crustal which needs to be understood when exploring for hyhy-- thickening and topographic uplift. In Infold-and-thrust fold-and-thrust drocarbons in salt basins. Structural traps often existexist atat belts, these detachments have traditionally beenbeen locatedlocated flanksflanks andand onon toptop ofof saltsalt diapirsdiapirs asas wellwell asas alongalong faultsfaults re-re- 46 ABSTRACTS latedlated to salt diapirs. The development of salt diapirs also faulting. TheThe resultsresults ofof thethe studystudy indicateindicate thatthat NeogeneNeogene has a major influenceinfluence onon sedimentationsedimentationwith withphases phasesof of activity ofof thethe saltsalt diapirdiapir mainlymainly occurredoccurred duringduring EarlyEarly toto vertical saltsalt movementmovement usuallyusually relatedrelated toto non-depositionnon-deposition Late Miocene times. NormalNormal faultingfaultingstarted startedin inthe thePlio- Plio- of sandstone reservoirs on top of salt diapirs but with cene and resulted in the development of a large listricIistric sandstone fairways mainly locatedIocated in mini-basins in bebe-- counterregional normal fault and associated antithetics. tween salt diapirs. The structural evolution ofof saltsalt diapirsdiapirs Normal faulting isis stillstillongoing ongoingand andit itis isassumed assumedthat thatex- -ex has therefore important implications forfor reservoirreservoir depo-depo- tension accommodated by gravitational normalnormal faultsfaults inin sition andand forfor thethe migrationmigrationhistory historyof ofhydrocarbons. hydrocarbons. the Pliocene to Recent section isis balancedbalanced byby wideningwidening InIn this study we investigateinvestigate thethe detaileddetailed tectonictectonic evolu-evolu- of the salt diapir at depth. tion ofof oneone saltsalt diapirdiapir andand aa gravitationalgravitationalextension extensionfault fault locatedIocated inin the Sureste Basin inin the southern Gulf of MexMex-- ico.ico. The analysis isis based on 3D seismic data and wells Multi-chronometer thermochronologicalthermochronological near the salt diapir. Salt interpretation isis donedone onon seismicseismic modelling of the Late Neoproterozoic to data with the top of salt readily identifiable. Flank Flankand and feeder of the salt diapir have lessless reliablereliable interpretationsinterpretations recent t-T-evolution ofof thethe ArgentineArgentinepassive passive due to poor seismic imaging close to the salt diapir. The continental marginmargin interpretedinterpreted salt diapir geometry isis very complex with a U. A. GlasmacherGlasmacherl,1, S. KollenzKollenzl,1, E. A. RosselloRossellol'z,1,2, D. F. deformed diapir shape and normal faults atop (see figure StockliStockli3,3, R. E. PereyraPereyra44 1). A large listricIistric normal fault, which offsets thethe seabed,seabed, 11HeidelbergHeidelberg University, Institute ofof EarthEarth Sciences,Sciences, Heidelberg,Heidelberg, Ger-Ger- passes into the diapir and several active antitheticantitheticfaults faults many also exist above the salt diapir. 22UniversidadUniversidad de Buenos Aires, Departamento de Ciencias Geológicas,Geolögicas, The development of normal faults in the vicinity of the Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina 33UniversityUniversity of Texas, Department of Geological Sciences, Austin, salt diapir was analysed using fault displacement methmeth-- Germany ods. For this purpose, displacements along the fault 44UniversidadUniversidad Nacional de Salta , Salta, Argentina surfaces were measured on latelate Neogene horizons. Backstripping of displacements then allowed the reconrecon-- Passive continental marginsmargins areare geo-archivesgeo-archives thatthat storestore struction ofof thethe faultfault developmentdevelopment throughthrough timetime(Childs (Childs informationinformation from fromthe theinterplay interplayof ofendogeneous endogeneousand and et al. 1993). exogenious forces related to continental rifting, rifting,post- post- breakup history, and climate changes. The recent South

- Atlantic passive passivecontinental continentalmargins(SAPCI\/I”s) margins(SAPCM“s)in Bra- in Bra-

_ .. . .‚ ‚Q.-'. Ä-l zil, Namibia, and South Africa are partly high-elevatedhigh—elevated

"- .._-|. '.'.'- _. -‘.'r.- .27 . .„.,„_ .'.:i|' margins (“2,000 m a.s.l.), and the recent N-S-trending . margins (~2,000 m a.s.l.), and the recent N-S-trending “rät "m

.r SAPCM in Argentine and Uruguay are of low elevation. 'H 1'._-.""-. SAPCM in Argentine and Uruguay are of low elevation. InIn Argentine, anan exceptionexceptionin inelevation elevationis isarising arisingfrom fromthe the higher topography (> 1,000 m a.s.l.) of the two NW-SE- [m5.] trending mountain rangesranges Sierras Septentrionales and

TWTT Sierras Australes. Precambrian metamorphic and intruintru-- sive rocks, and siliciclastic rocksrocks ofof OrdovicianOrdovician toto PermianPermian age represent the geological evolution ofof bothboth areas.areas. TheThe Sierras Australes have been deformed and metamormetamor-- phosed (incipient - greenschist) during the Gondwanides Orogeny. The low-temperature thermochronological (LTT)(LTT) data (<(< 240 °C) indicatedindicated that the Upper Jurassic to Lower Cretaceous opening of the South Atlantic hashas not completely thermally reset the surface rocks. The LTT For the development of the salt diapir, detailed biobio-- not completely thermally reset the surface rocks. The LTT archives apatite and zircon still revealed information on stratigraphic analysis analysisis isused usedto determine to determinethe ages the of ages of archives apatite and zircon still revealed information on the pre- to post orogenetic history of the Gondwanides identifiedidentified hiatuses hiatusesand andcondensed condensedsections. sections.Several Several the pre- to post orogenetic history of the Gondwanides and the IVIesozoic and Cenozoic South Atlantic geological condensed sections observedobserved inin wellswells cancan bebe correlatedcorrelated and the Mesozoic and Cenozoic South Atlantic geological evolution. Upper Carboniferous zircon (U-Th/He)-ages with local unconformities nearnear thethe saltsalt diapirdiapir identifiedidentified evolution. Upper Carboniferous zircon (U-Th/He)-ages (ZHe) indicate the earliest cooling below 180°C/1Ma. on seismic data. Unconformities nearnear thethe saltsalt diapirdiapir areare (ZHe) indicate the earliest cooling below 180°C/1Ma. interpretedinterpreted to reflectreﬂect verticalverticalmovements movementsof ofthe thesalt saltdia- dia- Most of the ZHe-ages are of Upper Triassic to Jurassic age. The apatite ﬁssion—track ages (AFT) of Sierras Sep- pir. Detailed mapping of thickness changes and dating ofof age. The apatite fission-track ages (AFT) of Sierras Sep- tentrionales and the eastern part of Sierras Australes in- unconformities isis thereforetherefore usedused toto reconstructreconstruct thethe tem-tem- tentrionales and the eastern part of Sierras Australes indicate the South Atlantic rifting and, thereafter. poral evolution ofof thethe saltsalt diapir.diapir. dicate the South Atlantic rifting and, thereafter. The combination ofof unconformityunconformity andand faultfault displace-displacement mapping was used to decipher the interplay bebe-- tween salt diapir development and gravitational normalnormal ABSTRACTS 47

Multi—chronometer thermochronological modelling of kinematic groundground truth,truth, thethe LOFZLOFZ isis commonlycommonly regardedregarded the Late Neoproteromic to recent t-T—evoiution as the main or only discontinuity toto accommodateaccommodate de-de- of the 8E coastal region of Braaii formation inin thethe volcanicvolcanic arc.arc. RecentRecent paleomagneticpaleomagneticand and "--|-—— “—.u ‚In... .H.-- kinematic studies, studies, however, however,provide provideindependent independentevi- - evi dence for distributed deformation alongalong aa numbernumber ofof ad-ad-

{3| '.|L'-| um?) ditional first-orderfirst-orderfaults faultsresulting resultingin inheterogeneous heterogeneousver- -ver tical axisaxis rotationrotationof ofrocks. rocks.Following Followingthese thesestudies, studies,we we highlight the complexity of deformation inin thethe SouthernSouthern Andes and discuss the roleroIe of the LOFZ in the tectonic settingby bymeans meansof ofdetailed detailedIineament lineamentanalysis analysisin incom- com- bination withwith aa reassessmentreassessment ofof publishedpublished kinematickinematicand and thermochronological data. Lineaments presented in this study were extracted from shaded reliefrelief models, drainage models and aspect maps derived from ASTER GDEM 2 high-resolution digitaldigital elevation models.models. ApatiteApatitefission fissiontrack trackand andU/Th-He U/Th-Heages ages were used to model exhumation rates, which were sub- i. I .' --_-- -—-.- -. -—_‚.—. were used to model exhumation rates, which were sub- r ._. I-I—IH'S sequently interpolated using an inverse-distance weightweight-- "in. l' ' ...‚_ 1'!“I |IIn... inging method. Between 42° S and 47° S, DEM-analysis rere-- . -.".'i.-'_'! veals a network of interconnected lineaments trending 100km ‘ - 'lfitheIntß-Tlrean- predominantly N-S, NE-SW, and NW-SE, a number of

"ull'r; "|:-:'.-r|'.l'||. 'lI-u' ' ' ..._.‚.‚ - .- ...-.. .-.--... p._|l.'|‘l.!'.-I_:-ll_.'r||: which displaying mutual offsets. Thermochronometry Thermochronometry .. _‚. - - l- .-. |||'|.'-:|:|'| data show enhanced exhumation inin thethe centralcentral cordilleracordillera where drastic changeschanges inin exhumationexhumationrate ratespatially spatiallycoin- coin- | ä | . cide with the intersection ofof Iineaments.lineaments. Here,Here, individualindividual fault-bound blocks display specificspeciﬁc exhumationexhumationrates. rates.

AFT-agesAFT—ages of MiddleIVIiddIe to Upper Triassic on the western side of the Sierras Australes are in contrast, indicating aa Trias-Trias- sic exhumation causedcaused byby thethe eastwardeastward thrustingthrustingalong along the Sauce Grande wrench. The corresponding t-T modmod-- els report a complex subsidence and exhumation historyhistory with variable rates since the Ordovician. Based on the LTT-dataLTT—data and the numerical modelling we assume that the NW-SE-trending mountian rangesranges receivedreceived theirtheir geo-geo- graphic NW-SE orientation duringduring thethe syn-syn- toto postorge-postorge- netic historyhistory ofof thethe Gondwanides.Gondwanides.

Distributed transpressive deformation inin InIn contrast to the common, ratherrather crude perception ofof intra-arcintra-arc deformation inin thethe SouthernSouthern Andes,Andes, resultsresults ofof the Southern Andes: Insights from Iow- the Southern Andes: Insights from low- our work, in lineIine with most recent studies, require rere-- temperature geochronology and DEM- consideration ofof thethe kinematickinematicmodel. model.Most Mostimportantly, importantly, analysis deformation appearsappears toto bebe distributeddistributed acrossacross thethe entireentire width of the Southern Andes, and the fore-arc sliver is P. L. GöllnerGöllnerl,1, J. O. EisermannEisermann1‚1, U. RillerRilIer11 displaced on a network of structural discontinuities, 11InstitutInstitut fürfür Geologie,Geologie, UniversitätUniversität Hamburg,Hamburg, Hamburg,Hamburg, GermanyGermany ratherrather than merely on the LOFZ.LOFZ. Moreover,IVIoreover, variations ModelsIVIodels of intra-arc deformation inin thethe SouthernSouthern AndesAndes inin exhumation ratesrates ofof individualindividual fault-boundfault-bound blocksblocks callcall commonly focus on displacement along the Liquiñe-Liqui'ﬁe- for significantsigniﬁcant vertical verticaldisplacements displacementsduring duringdeforma- deforma- Ofquiqui Fault Zone (LOFZ), which cuts the modern Andean tion. Collectively,Collectively,results resultsof ofthis thisstudy studyindicate indicatea arather rather volcanic arc along-strike for more than 1000 km. In acac-- uniform deformation ofof thethe entireentireSouthern SouthernAndes Andesas asa a cordance with the oblique plate convergence, northward resultresult of oblique convergence. displacement of the ChiloéChiloe Block, apparently a detached forearc sliver, has been interpretedinterpreted as evidence for an overall dextral displacement on the LOFZ. In the context of this tectonic framework, which is poorly supported by 48 ABSTRACTS

Lithospheric temperature and rheology of the 3D density structure of the Caribbean lithoIitho-- North Patagonian Massif plateau, Argentina. sphere derived from Vertical GravityGravity Gra-Gra- M. L. Gomez DacalDacall,1, M. Scheck-WenderothScheck-Wenderothl'z,1,2, M. CaCa-- dients: Implications forfor regionalregional tectonictectonic cacecacel,1, E. AragónAragon3'4,3,4, C. TochoTocho5'65,6 boundaries and the characterisation ofof geo-geo- 11HelmholtzHelmholtz Centre Potsdam. GFZ German Research Centre for GeosciGeosci-- hazards ences, Potsdam, Germany A. M. Gomez Garcia1'2'3,1,2,3 C. Meeßen1'4,1,4 M. Scheck—Wen- 2 A. M. Gomez Garcia , C. Meeßen , M. Scheck-Wen- 2RTWHRTWH Aachen, Fakultät Georessourcen Materialtechnik, Aachen, 1 5 2 1 Germany derothderoth1,TGonzaIez5,, î González , G. MonsalveMonsalvez,, J. BottBottl,, A. BernBern-- 3 2 33CentroCentro de Investigaciones Geologicas.Geológicas. FacultadFacultad dede CienciasCiencias NaturalesNaturales hardthardt3,, G. BernalBernal2 y Museo. Universidad Nacional de LaLa Plata, La Plata, Argentina 11GFZ,GFZ, Potsdam, Germany 4 4ConsejoConsejo Nacional de Investigaciones Cienti’Científicasficas y tecnicas,y técnicas,Buenos Buenos 22UniversidadUniversidad Nacional de Colombia, Medellín,Medelli’n, Colombia Aires, Argentina 33FreieFreie Universität, Berlin, Germany 55FacultadFacultad de Ciencias AstronómicasAstronomicas y Geofísicas.Geofi’sicas. UniversidadUniversidad NacionalNacional 44UniversityUniversity of Potsdam, Institute forfor EarthEarth andand EnvironmentalEnvironmental Sci-Sci- de La Plata, La Plata, Argentina ences, Potsdam, Germany 66Comisic’mComisión de Investigaciones Cienti’Científicas.ficas. Provincia Provinciade deBuenos BuenosAires., Aires., 55CentreCentre de Recerca MatemàticaMatematica —– CRM,CRM, Bellaterra,Bellaterra, SpainSpain LaLa Plata, Argentina The oceanic lithosphereIithosphere is one of the less well-known The North Patagonian Massif (NPM), in central ArgenArgen-- features of the outer Earth. Here, we propose a new tina, includesincludes aa plateauplateau ofof anan averageaverage altitudealtitudeof of1200 1200 method for inferring the density of the crystalline crust m.a.s.l. mostly surrounded by basins that stand between and delimiting itsits tectonictectonic boundariesboundaries atat thethe crustalcrustal level.level. 500 to 700 m below it. Geological observations andand pre-pre- As a novelty, instead of modelling the gravity anomalies vious works indicate that the present-day elevation of of and assuming a flatflat EarthEarth approximation,approximation,we wemodel modelthe the the plateau was reachedreached in the Paleogene by a sudden Vertical GravityGravity GradientsGradients (VGG)(VGG) inin sphericalspherical coordinates.coordinates. uplift that thatdid didnot notinvolve involvenoticeable noticeabledeformation. deformation.To To The methodology is validated in the oceanic domain of gain insight into the causes of the uplift andand thethe geody-geody- the Caribbean region.region. namic development ofofthe the area, it is necessary to characcharac-- First, we defineddefined a aIithospheric lithosphericstarting startingmodel modelcon- con- terize the lithosphereIithosphere in terms of itsits present-day physical strained using up-to-date geophysical datasets, includinclud-- properties. ing:ing: seawater, sediments, crystalline crust and mantle InIn this study, we present models of the three-dimenthree-dimen-- down to a depth of 200 km. After testingtestingseveral severala-priory a-priory sional lithosphericIithospheric distribution of oftemperature temperaturein inthe the density distributions, calculating calculatingtheir theirVGG VGGresponse, response, area, as well as, of the maximum differentialstress stressthat that we selected the model with the minimum RMSE (Root the rocksrocks are able to resistresist without experiencing either Mean Squared Error) with respect to EIGEN-6C4 dataset. brittle oror ductileductiledeformation deformationunder undergiven givenpressure pressureand and InIn this model, the density ofofthe the seawater, sediments and temperature conditions. For For the thethermal thermalcalculation, calculation, mantle was calculated in 3D using existing empiricalempirical for-for- we used the software GOLEM GOLEMand, and,in inthe thecase caseof the of the mulations. Second,Second, wewe inferredinferred thethe densitydensity oftheof the crystal-crystal- strength calculations, aa codecode thatthat resolvesresolves Byerlee”sByerlee“s lawlaw lineline crust by invertinginverting thethe VGGVGG field.field.This Thismethodology methodology for the brittle partpart andand power-Iawpower-law rheologyrheology functionsfunctionsfor for allowed us to obtain a 3D density distribution forfor allall thethe the ductile one.one. WeWe useuse asas aa basebase forfor thethe models,models, anan ex-ex- layerslayers of the Caribbean lithosphere.Iithosphere. istingisting gravitygravity constrainedconstrained 3D3D geologicalgeological modelmodel thatthat waswas Additionally, basedbased onon thethe gradient’sgradient‘s residualsresiduals (EIGEN-(EIGEN- developed in a previous project. It includes all available developed in a previous project. It includes all available 6C4 measurements minus modelled results), we identiidenti-- geological and geophysical information toto constrainconstrain thethe fiedfied crustalcrustal featuresfeatures suchsuch asas high-densityhigh-density bodiesbodies locatedlocated geometries and the lithologiesIithologies of the model units and inin the forearcs of the LesserLesser and Leeward Antilles. Fi- Fi- was compared to the observed gravity to obtain the nally,naIly, we proposed and/or confirmedconfirmed importantimportant tectonictectonic depth ofthe Moho. By using the model configuration, we depth of the Moho. By using the model configuration, we boundaries in regions such as Yucatan, Colombian, VenVen-- assigned to each unit corresponding thermal properties ezuelan and Grenada basins, including the Continental- to calculate the thermal fieldfield andand afterwardsafterwardsalso alsoparam- param- Oceanic Boundary in the study area (Figure 1). eterized the model in terms of mechanical properties toto The South Caribbean is particularly proneprone toto differentdifferent obtain the strength distribution withinwithin thethe Iithosphere.lithosphere. geohazards, including earthquakes and tsunamis. This With this contribution, wewe presentpresent aa comparisoncomparison be-be- margin is characterised by the flat-slabflat—slab subductionsubductionof ofthe the tween the model derived physical properties insideinside thethe Caribbean plate under the continental SouthSouth AmericanAmerican plateau with those obtained for the surrounding areas. plate. The hazard risk assessment in the region has been The predicted present-day temperature and strength difdif-- mainly assessed considering the tectonics and seismicseismic-- fer significantlysignificantly fromfrom oneone regionregion toto thethe other,other, differenti-differenti- ity;ity; however, tsunamis can also be triggered by the dede-- ating thethe NPMNPM plateauplateau inin termsterms ofof thesethese characteristics.characteristics. stabilisation ofof gasgas hydrateshydrates deposits,deposits, especiallyespecially inin river-river- This analysis helps to test hypotheses on the influenceinfluence dominated margins, such as the South Caribbean region. of the temperature and strength distribution inin thethe geo-geo- The knowledge of the thermal distribution inin subduc-subduc- dynamics of the region and brings up for discussion the tion systemssystems cancan bebe usedused asas aa proxyproxy forfor thethe delimitationdelimitation causes of the formation ofof thethe plateauplateau andand itsits present-present- of the width of the seismogenic zone, taking advantage day elevation. of the stick-slip behaviourbehaviour thatthat rocksrocks atat subductionsubductionzones zones ABSTRACTS 49

show, especially between 150°C and 350°C. Meanwhile, there are still somesome featuresfeatures oftheof the structurestructure andand tectonictectonic gas hydrates are stable in low-temperature and high- scheme that remain uncertain or unknown in the regionregion-- pressure environments, normally found in marine sedisedi-- alaI and locallocaI context. ments within continental slopes,slopes, withwith dominantdominant temper-temper- 9'303 I 1303 11330: 1541:1] 13'Ü3'EI “505'03- 21cm atures ranging from 5°C to 10°C, at depths greater than

400 m.

i ﬁ

Currently, we are developing the firstﬁrst 3D3D thermalthermal mod-mod- j ‚. el of the South Caribbean margin, using the obtained 3D TWT lithosphericIithospheric density distribution. TheThe expectedexpected resultsresults in-include an evaluation oftheof the seismogenicseismogenic zones,zones, andand aa pre-pre- liminaryIiminary characterisation oftheof the gasgas hydratehydrate stabilitystability zonezone

(GHSZ)(GHSZ) inin this tectonically active andand complexcomplex region.region.

I |o._-|-|

BEI I I30 Elu'a'dli'cr'i

GÜ IHM] m: 1.51.1 I'IJ EU '31.“ 'IIIU l 1U '21." 13H 'II1I'.l M 15:“ Ü ran-m -_|IEI'|I H ‚I'hcutu'or. 1 J I D in l’u This study is part of the PICTURES (Pisagua/Iquique

Hln This study is part of the PICTURES (Pisagua/Iquique .1. t: Crustal Tomography Improves Understanding of Region -T -.__ .I I. .. l I ‚l 1...... - ._- . ‚ ‚557-11. ﬁoulh Amuriru'?‘ - H Ü of the Earthquake Source) project, which main goal is to 90"“!!! BBÜW 30"".‘J ".I'S"w PD'W‘I 65"“! EGÜW understand the role that features and geologic structure — Tectonlcfterrain büu ruzl aries ithls study:- — LJrII: Iear CDT of the upper plate played on the occurrence of the 2014 Mw 8.2 Pisagua/Iquique earthquake offshore northernnorthern Chile and, in general, the regional seismicity. Seismic w ü C! Chile and, in general, the regional seismicity. Seismic “D 'I1 Kg

u D reﬂection and refraction data were acquired during the an -..r| reflection and refraction data were acquired during the

Flow-3105| IVIGL1610 cruise along a grid of 2D lines and recorded on _uqüü- ‘iIlCIEi MGL1610 cruise along a grid of 2D lines and recorded on '1 HE "REISE? 25'130. ocean bottom seismometers seismometersto togenerate generatea 3D avelocity 3D velocity I."'I h

GEHEN]I LFIJ‘JZäl model. In particular, thethe goaIgoal ofof thisthis workwork isis toto analyzeanalyze

-2T5I} the variability of the margin structure along the north of answggma-H? - .-="-*-'- ' 1. South Amar 4:. ' _ - . _ . I' . _.. . . _ "21'39 Chile between 19 and 2195 and its implications for the ÜÜ'W 35"W 30"W ?5°W 'I'Ü'W [15“."1' E'Ü"W Chile between 19 and 21ºS and its implications for the — 'Fflü_r_l'1|n;'_‚l‘!_|:'!r'a||| büundal'us ITl|.5 *_'.I_I.J|_l:‚-'] tectonic control and the seismicity. For this purpose, four ~150”150 km longIong W-E reflectionreflection lines linesare areprocessed processedfol- fol- Figure 1. a) Residuals of the VGG and the tectonic and terrain boundbound-- lowinglowing a standard reflectionreflection seismic seismicsequence. sequence.P-wave P-wave aries refined,refined, proposedproposed oror conconfirmedfirmed in inthis thisstudy. study.Color Colorscale scalesatu- satu- 2D velocity sections areare alsoalso obtainedobtained followingfollowing aa traveltravel ratedrated at -90 and +90 Eötvös. b) Average crustal densities inferredinferred time tomography tomography inversion inversionprocedure procedureusing usingrefraction refraction from the forward modelling of the VGG. time arrivalsarrivals ofof thethe multichannelmultichanneldataset, dataset,which whichallows allows to give a good spatial resolutionresolutionfor forthe theshallow shallowstructure structure

of the continental slopeslope alongalong thethe margin.margin. SeismicSeismic andand Seismic structure and tectonics of the north Seismic structure and tectonics of the north velocity sections areare thenthen interpretedinterpreted togethertogether toto givegive anan Chilean convergent margin between 19ºS1995 and imageimage of the main features along the margin, especially 21ºS219S using multichannel seismicseismic rereflectionflection for the shallow structure. data F. GonzalezGonzalezl‚1, E. Contreras-ReyesContreras-Reyesl,1, A. TrehuTrehu2‚2, E. VeraVera11 Understanding seismic and tsunami hazards 11UniversidadUniversidad de Chile, Departamento de Geofisica,Geofisica, Santiago,Santiago,Chile Chile 22OregonOregon State University, College of Earth, Ocean, and Atmospheric inin the Chilean subduction zone:zone: Iessonslessons Sciences, Corvallis, United States and perspectives fromfrom thethe frameworkframework ofof The convergent margin of north Chile is widely recogrecog-- interdisciplinaryinterdisciplinary studies nized as an erosive subduction zonezone duedue toto thethe Iacklack ofof G. GonzálezGonzälez L.L.11 sediment contribution fromfrom thethe continentcontinentand andevidenced evidenced 11UniversidadUniversidad CatólicaCatolica del Norte, Departamento de Ciencias GeológiGeologi-- by a landwardIandward migration ofof thethe volcanicvolcanic arcarc duringduring thethe cas, Antofagasta, Chile past 100 Myr,IVIyr, frontal and basal erosion, subsidence, among others. There is also a well-studied seismic gap, The aftermath of ofthe the2010 2010Mw 8.8 Mw IVIaule 8.8 MauleEarthquake Earthquake where no major earthquakes (Mw>8.5)(IVIw>8.5) have occurred and the 2011 Mw 9.1 Great East Japan Earthquake since 1877. Although some studies have been develdeveI-- brought to lightIight a fragmentation thatthat existsexists betweenbetween sci-sci- oped in the past years regarding the geologic and seisseis-- ence, stakeholders and community. New discoveries and mic structure of the margin and its tectonic implications, observational methodologiesmethodologies fromfrom thethe earthquakeearthquake andand 50 ABSTRACTS tsunami sciences were not enough to diminish the imim-- Ma. However, ages of the ElEI Bao pluton overlap at about pact of these two great earthquakes and their coupled 86 Ma, whereas the rocks of ElEI RíoRio and Jumunuco pluton tsunami events. As a consequence of these recentrecent devdev-- display a wider range. In the ElEI RíoRio pluton, the biggest astating tsunamis, tsunamis,Chile Chilecalculated calculated156 156victims victimsand Ja- - andJa and structurally most complex of the three studied intruintru-- pan nearly 13,000. In order to avoid the future impact sions, the measured zircon ages are in agreement with of natural disasters in Chile, in 2011 the National ScienceScience the relativerelative ageage relationsrelationsobserved observedin inthe thefield. field. Foundation ofof ChileChile (CONICYT)(CONICYT) launchedlaunched aa competitivecompetitive call to create the firstfirst centercenter forfor interdisciplinaryinterdisciplinary studiesstudies of disaster risk reduction. This Thiscompetitive competitiveapplication application call was aimed to develop the scientificscientific basis basisfor foran anef- -ef ficientficient andand effectiveeffectivetransference transferenceof ofthe thenew newknowledge knowledge of hazard-risk sciences to the public. After sevenseven yearsyears inin itsits development, CIGIDEN (National(National ResearchResearch CenterCenter for IntegratedIntegrated Natural Disaster Management) has bebe-- come a key component of the disaster mitigationstrat- strat- egy of Chile. CIGIDEN is a consortium formed formed by by four four Chilean Universities in inwhich whichparticipate participategeoscientists, geoscientists, engineers, sociologists, psychologists, urban planners, journalists and anthropologists. InIn the present contribucontribu-- tion wewe presentpresent keykey lessonslessons forfor DisasterDisaster RiskRisk ReductionReduction Strategies learned from studying the most recent earthearth-- quakes, which occurred in Chile, the 2010 Mw 8.8 Maule The main sequence of intrusion is marked by early tonaltonal-- Earthquake, the 2014 Mw 8.1 Iquique earthquake and itesites that are laterlater followed by younger granodiorites and the 2015 Mw 8.3 IllapelIllapel Earthquake. We reviewedreviewed the granites and approximately concurrent dioritic rocks. rocks. most important scientificscientific milestones, milestones,which whichhave havebeen been Besides, the distribution ofof agesages throughoutthroughout thethe ElEl RioRío developed with an interdisciplinary perspective forfor disas-disas- pluton points to an early emplacement of tonalites in ter riskrisk reduction.reduction. KeyKey aspectsaspects revisitedrevisited inin thisthis contri-contri- the northern part and subsequent intrusionintrusion of magmas bution are:are: HowHow toto generategenerate earthquakeearthquake scenariosscenarios usingusing to the south. The ubiquitous occurrence of mixing and the existing observation observationmethodologies methodologiesin subduction in subduction mingling structures between maficmafic andand felsicfelsic rocksrocks andand zones. What are the keykey parameters of earthquake scesce-- the lacklack of a correlation betweenbetween zirconzircon ageage andand differ-differ- narios for substantial tsunamitsunami impactimpact reduction.reduction.What Whatis is entiationindices indicespoint pointto toa acontinuous continuousreplenishment replenishmentof of the rolerole of coastal geomorphology for assessing tsunami magma reservoirs in the studied intrusions. The occuroccur-- impact.impact. What are the still pending pendingaspects aspectsin inreducing reducing rencerence of voluminous plutons of ages between 90 and 80 the number of tsunami victims. HowHow wewe cancan efefficientlyficiently Ma in the Cordillera Central constrains that the main acac-- and effectivelytransfer transferhazard hazardscience scienceto stakeholders to stakeholders tivity ofof magmatismmagmatismin inthe theDominican Dominicansegment segmentof ofthe thearc arc and communities. took place inin this phase. The absence of inheritedinherited zircon older than 100 Ma furthermore indicates its nearly excluexclu-- sive oceanic evolution inin thethe Cretaceous.Cretaceous. TheThe agesages ofof thethe Ages and internal structure of plutons in the Ages and internal structure of plutons in the dated rocks fall into the Upper Cretaceous phase of arc Dominican segment of the Caribbean Island magmatism inin thethe GreatGreat CaribbeanCaribbean ArcArc andand areare compa-compa- Arc rablerable to other intrusionsintrusions along the Greater Antilles. B. HärtelHärtell,1, O. FreiFreiz,2, K. P.P. StanekStanek11

11TUTU Bergakademie Freiberg, Institute ofof Geology,Geology, Freiberg,Freiberg, GermanyGermany 22TUTU Bergakademie Freiberg, Institute ofof Mineralogy,Mineralogy, Freiberg,Freiberg, Ger—Ger- The Quaternary PayúnPayun MatrúMatrü caldera, andean many back-arcback—arc of the Southern Volcanic Zone: One of the main processes governing the crustal evoluevolu-- insightsinsights intointo its caldera-forming eruption tion oftheof the CaribbeanCaribbean isis thethe magmaticmagmaticactivity activityofthe of theGreat Great deposits Caribbean Island Arc. On the Greater Antilles, the Cordil- Caribbean Island Arc. On the Greater Antilles, the Cordil- I.I. HernandoHernandol,1, I.I. PetrinovicPetrinovicz,2, D. GutiérrezGutierrez3,3, J. BucherBucherl,1, T. leralera Central of Dominican Republic isis one of the outcrop FuentesFuentesl,1, E. AragónAragon11 areas for studying the plutonic basement of the CaribCarib-- 11CentroCentro de Investigaciones GeolögicasGeológicas (CONICET—UNLP),(CONICET-UNLP), LaLa Plata,Plata, bean Island Arc. We present zircon U-Pb ages of 18 rock Argentina samples from the ElEl Río,Rio, ElEI Bao and Jumunuco plutons. 22CentroCentro de Investigaciones enen CienciasCiencias dede lala Tierra,Tierra, Cordoba,Córdoba, Argen-Argen- The samples range from diorites to peraluminous grangran-- tina 3 iteite with the majority being tonalites. The resultsresults show a 3UniversityUniversity of La Plata, La Plata, Argentina contemporaneous emplacement of the three intrusions The Quaternary PayúnPayun MatrúIVIatrü caldera is located in the inin the midst of the Cordillera Central between 90 and 80 back-arc of the Southern Volcanic Zone of the Andes, ABSTRACTS 51 western Argentina, andand representsrepresents thethe mainmain volcanicvolcanic edi-edi- inin the lateIate Miocene.IVIiocene. To a firstfirst order,order, thethe geographicgeographic co-co- ficefice oftheof the PayünPayún IVIatrüMatrú VolcanicVolcanic FieldField (PIVIVF).(PMVF). TheThe PIVIVFPMVF incidenceincidence of the Pampean flat-slab,flat-slab, topography, topography, total total isis locatedIocated within Payenia, a volcanic province charactercharacter-- crustal shortening and the west to east sweep of magmamagma-- izedized by alkalic basaltic volcanism. volcanism. The ThePIVIVF PMVFpresents presents tism comescomes togethertogether inin whatwhat appearsappears toto bebe appearsappears toto aIIall the homonym caldera along with the PayúnPayün Liso volcano but a foregone conclusion. Yet, a spate of recent studies and 220 basaltic monogeneticmonogeneticcones. cones.Payün PayúnIVIatrü Matrúhas has includingincluding foreland basin deposits, bedrock and detrital a long-livedIong-Iived pre-calderapre—caldera stage where a shield-likeshieId—Iike edificeedifice thermochronology, cosmogenic nuclide-derived erosion has been built. The syn-caldera stage is represented by ratesrates and other geomorphic observations squarely squarelycaII call the Pleistocene Portezuelo IgnimbriteIgnimbrite and the resultingresulting the simple flat-slabflat—slab Iinked,linked, eastward-steppingeastward-stepping deforma-deforma- caldera depression of 8.5 km in diameter. Afterwards thethe tion modelmodel intointo question.question.Observations Observationsfrom froma seriesa seriesof of caldera event, volcanism continued mostlymostly alongalong thethe cal-cal- previously published studies, combined with new detridetri-- dera rim. tal thermochronology data make the case for spatially We present stratigraphic sections,sections,facies faciesanalysis analysisand and continuous rockrock upliftupliftin inthe theFrontal FrontalCordiIIera Cordilleraand andPre- Pre- mineralogical studies of the Portezuelo Ignimbrite, in oror-- cordillera prior to the onset of the flat-slabflat-slab atat inin thethe LateLate der to determine pre-eruptive conditions,conditions,onset onsetof ofcol- col- Miocene.IVIiocene. Data from cosmogenic nuclide concentrations lapselapse and eruptive historyhistory ofof thethe caldera-formingcaldera-forming erup-erup- of sediment in rivers that drain catchments throughout tion deposits. deposits.The Theextra-caldera extra-calderaPortezuelo PortezueloIgnimbrite Ignimbrite this segment of the Andes show overalloveraII higher erosion shows different facies,facies, beingbeing mostmost ofthemof them massivemassive oror eu-eu- ratesrates on the eastern flanksflanks ofof thethe rangerange despitedespite steepersteeper taxitic andand massivemassive IapiIIilapilli tuf‘ftufffacies, facies,deposited depositedby bydense dense slopes and an order of magnitude increase in precipitaprecipita-- pyroclastic densitydensity currents.currents. FaIIFall depositsdeposits areare foundfound onlyonly tion onon thethe westernwestern sideside ofof thethe range.range. ThisThis resultresult dem-dem- restrainedrestrained to the caldera margin, suggesting thethe Iacklack ofof onstrates that tectonically controlled rock uplift, not not a sustained eruptive column column at at the theonset onsetof oferuption. eruption. climate or vegetation, exertsexerts aa firstfirstorder ordercontrol controlon onmod- mod- Massive tuff facies facies are arefound foundat atthe thetopmost topmostdeposits deposits ern erosion rates in this segment of the Andes. On both south of the caldera, and indicates the development of a sides of the Andes there is a prominent, and symmetric, co-ignimbritic plumeplume asas thethe pyroclasticpyroclasticdensity densitycurrents currents spike peak in erosion ratesrates centered at 33.75°S latitude,Iatitude, wanned. Four distinctjuvenile juvenile clastsclasts werewere recognizedrecognized onon where catchment-wide erosion rates rates exceed 400 the basis of color, shape, size, vesicularity and crystallincrystallin-- m/Ma.m/IVIa. Extremely young, non-volcanic detrital zircon ity.ity. These are: gray fiamme,fiamme, Iightlight graygray pumice,pumice, darkdark graygray (U-Th/He)(U-Th/He) data from the TunuyánTunuyan and Arroyo Grande pumice and black juveniles. Whole-rockWhoIe-rock chemical analyanaly-- catchments, alongang with independently derived estimates ses of gray fiammefiamme andand blackjuvenilesblack juveniles havehave aa similarsimilar tra-tra- of surface uplift stronglystrongly suggestsuggest thisthis isis notnot aa transienttransient chytic composition,composition,while whilethe themineralogical mineralogicalcomposition composition signal confinedconfined toto modernmodern erosionerosion rates.rates. OnOn thethe whole,whole, of juvenile clasts reveals some differences, specially speciallyin in our analysis supports the notion thatthat moremore massmass isis fluxedfluxed feldspars. On the basis of discontinuity surfacessurfaces andand thethe through the eastern flankflank ofof thethe Andes,Andes, eveneven southsouth ofof juvenile clasts population oftheof the ignimbrite,ignimbrite, severalseveral erup-erup- ~33°S“33°S where the orogen narrows and crustal shortening tive unitsunits werewere dedefined.fined. Given Giventhe theabsence absenceof ofIithic lithicbrec- brec- abruptly decreases. cias, the onset of collapse is suggested by a change in the juvenile clasts population inin thethe topmosttopmost eruptiveeruptiveunit, unit, which presents dark gray and lightIight gray pumice together Palynofacies and maturity offshore SurinameSuriname with blackblackjuveniles. juveniles. The sequential appearanceappearance ofof differ-differ- —– implications forfor thethe petroleumpetroleum systemsystem ent juvenile clasts suggests a zoned magma chamber, in terms of crystal content and mineralogical composition. B. HolsteinHolsteinl,1, B. BöckelBöckel11 11WintershallWintershall Dea Wietze Laboratory

Former DEA and their partners drilleddriIIed an offshore ex-ex- Andean exhumation andand erosionerosion acrossacross thethe plorationpIoration weIIwell Iocatedlocated 120km120km offoffthe theSuriname Surinamecoast coastin in Pampean flat-slabflat-slab transitiontransition the Suriname-Guyana Basin. This passive, continental- G. HokeHokel,1, A. LossadaLossadaz,2, P. ValVal3,3, L.L. GiambiagiGiambiagi44 margin-stylemargin—style sedimentary basin is considered to comcom-- 11SyracuseSyracuse University, Dept. of Earth Sciences, Syracuse, NY, United prise allaII elements required for a promising hydrocarbon States province. These Cretaceous to Tertiary agedaged successionssuccessions 22UniversidadUniversidad de Buenos Aires, Instituto dede EstudiosEstudios Andinos,Andinos, BuenosBuenos are characterized by interbedded sands and shales, dede-- Aires, Argentina posited in a variety of marine and non-marine environenviron-- 33UniversidadeUniversidade Federal de Ouro Preto, Department of Geology, Ouro Preto, Brazil ments, and marine carbonates. 44CONICETCONICET Centro CientíficoCienti’fico Technologico TechnológicoMendoza Mendoza, ,IANIGLA, IANIGLA,Men- Men- InIn the present study the presence of an Upper CretaCreta-- doza, Argentina ceous petroleum system is tested with potential sourcesource rocksrocks of Cenomanian to Turonian age and intercalated The temporal and spatial evolutionevolutionof ofAndean Andeanorogeny orogeny turbiditic sandstones. sandstones.Besides Besidesdetailed detailedpalynofacies palynofacies between 30°S and 35°S during the Neogene is tradition- between 30°S and 35°S during the Neogene is tradition- informationinformation in interms termsof ofpalaeoenvironment, palaeoenvironment,the thema-- ma allyaIIy linkedIinked to the development of the Pampean flat-slabflat-slab turity is assessed by means of spore coloration index index 52 ABSTRACTS

(SCI)(SCI) and vitrinite reflectancereflectance (VR). (VR).The Thestudied studiedinter- -inter IntoInto Amazonia: the history of the Amazon val stratigraphically stretches stretches from fromthe thePaleocene Paleoceneto to River and rainforest MiddleIVIiddle Albian. 30 samples are considered for palynopalyno-- 1 facies analysis and 11 samples for vitrinite reflectancereflectance C. HoornHoorn1 measurements. For the kerogen classification,classification, palynopalyno- 1 InstituteInstitute forfor BiodiversityBiodiversity andand EcosystemEcosystem Dynamics,Dynamics, UniversityUniversity ofof facies analysis, and SCI an inhouseinhouse classificationclassification syssys- Amsterdam tem and procedures isis applied. The slides for Vitrinite InIn this presentation II hopehope toto taketake youyou withwith meme onon aajour- jour- reflectancereflectance measurements measurementsare areprocessed processedaccording according ney that started in 1988 went I firstfirst visitedvisited thethe AmazonAmazon to internationalinternational standards standards (ICCP (ICCP& &ASTM ASTMD7708-14). D7708-14). rainforest.rainforest. My mission was to document the Tertiary atat 100% whichever outcrops I could findfind andand performperform palynologi-palynologi- Phyggglasts cal analysis of samples to get an insight into the history of the rainforest. My research started at Araracuara (Ca(Ca-- quetáqueta Province, Colombia), which means ‘home’home of the macaws’, however, this site also had a dark history, as itit was a former penal colony for the most dangerous criminals from Colombia. Araracuara is situated along the CaquetáCaqueta River, which cuts across Paleozoic and NeoNeo-- gene formations. TheThe Iatterlatterturned turnedout outto tobe bea akey keyto tothe the puzzle of how the history of the Amazon and its rainforrainfor-- est unfolded. I will also introduce you to some of the rere-- search sites in Peru and Brazil, and even extend to the deep waters at the mouth of the Amazon, which forms iooüxa 1000;; AOM Palynomorphs part of my more recent research. The data collected and FigureFigure:: Ternary AOM –— phytoclast —– palynomorph diagram. The the collaboration with withmany manygreat greatcolleagues colleaguesmade madeit it diagram allows to characterize kerogen assemblages considering the possible to liftlitt aa tiptipof ofthe theveil veiland anddiscover discoversome someof ofthe the differences inin relativerelativeproximity proximityto toterrestrial terrestrialorganic organicmatter mattersources, sources, history of the Amazon. This story is still unfolding unfoldingand and kerogen transport paths and the redox status of depositional future work can generate more knowledge on this enen-- sub-environments which control AOM preservation. TheThe examinedexamined samples are mainly placed in fieldsfields withwith anoxicanoxic conditions.conditions. dangered ecosystem.

Nearly all samples show high percentages of amoramor-- phous organic matter (AOM).(AOM). TheThe samplessamples mainlymainly belongbelong GPR supported sampling for environmental to kerogen type 2 (marine, liptiniteIiptinite rich)rich) andand partiallypartiallyto to purposes. Examples from te Rio SãoSäo Francisco type 3 (input of terrestrial material). Most ofofthe the samples marginal lagoons, Minas Gerais, Brazil. indicateindicate marine, anoxic conditions withwith goodgood preserva-preservation conditionsconditionsfor fororganic organicmatter matter(Fig. (Fig.#). #).In Ina neighbor-a neighbor- H. A. HornHorn1‚1, P. A. AranhaAranhal,1, W. TrindadeTrindade2‚2, A. MagalhãesI\/Iagalhäes33 inging well, the kerogen was also assessed type IIII and interinter-- 11UFMG,UFMG, Geology, Belo Horizonte-MG,Horizonte—MG, Germany preted as a product of an upwelling system. 22|FNMG,IFNMG, Geography, Pirapora-MG, Brazil 3 The thermal maturity measurement data indicate that 3UFMG,UFMG, Geography, Belo Horizonte-MG,Horizonte—MG, Brazil all samples can be assigned to the oil window. They all The human occupation ofthe San Francisco basin, begin- yield only a small number of spores, resulting inin aa lowlow The human occupation of the San Francisco basin, beginning with the economic wonder initiated by the Vargas e levellevel of confidenceconfidence duedue toto thethe lowlow numbernumber ofof measure-measure- ning with the economic wonder initiated by the Vargas e Kubitschek administrations, resultsresults inin anan increaseincrease ofof thethe ments. The small size of the vitrinite grains hamper the impacts. From the beginning of the 20th century took proper distinctionbetween betweenvitrinite vitriniteand andother othermacerals macerals impacts. From the beginning of the 20th century took place an intense use of the natural resources of the Säo (inertinite(inertinite andand bituminite).bituminite). NearlyNearly allall samplessamples showshow twotwo place an intense use of the natural resources of the São Francisco River, like electricity production, fish creating, populations ofof measuredmeasured VRVR values.values. ItIt cancan bebe assumedassumed Francisco River, like electricity production, fish creating, agriculture and heavy industry. The population multi- that the population withwith lowerlower valuesvalues rereflectsflects measured measured agriculture and heavy industry. The population multi- plied in some years. All this economic important activities values of bituminite. plied in some years. All this economic important activities caused an immense and increasing impact on the river Summing up, thermal maturity parameters and kerokero-- caused an immense and increasing impact on the river system. The natural and anthropogenic induced changes gen composition indicate,indicate, underunder thethe assumptionassumptionthat thatthe the system. The natural and anthropogenic induced changes in the system are reflected in the sediment system of the TOC is high enough, a moderate hydrocarbon generation in the system are reflected in the sediment system of the marginal lagoons. IVIarginal lagoons are filled during the potential. Critical Criticalfor forthe theUpper UpperCretaceous Cretaceouspetroleum petroleum marginal lagoons. Marginal lagoons are filled during the flooding of the river and together with wind transport, system seems reservoirreservoir presence in form of mass transtrans-- flooding of the river and together with wind transport, rain washout and interaction with subsurface water with port deposits. rain washout and interaction with subsurface water with sediment material. Therefore, marginal lagoonslagoons are an importantimportant for the knowledge of the evolution ofof aa riverriver system. To obtain representative pro profilefile sampling samplingit is it is necessary to know the sediment, geological e dynamidynami-- ABSTRACTS 53 cal situation otof thethe lagoons.lagoons. ToTo obtainobtain intormationinformationabout about tion spacespace createdcreated onon thethe upperupper slope.slope. TheThe lowerlower drittdrift sediment distribution andand structures,structures, GPRGPR -- proprofilesfiles on on isis characterized by aggrading strata, which turn upwards lagoonslagoons are an adequate technique fortor rapidrapid and exact intointo seaward prograding clinoforms, similar to those resultsresults and permit to findfind easily easilyappropriate appropriatelocations locations known from the Florida slope. We suggest that the inin-- for drilling and sampling. The structure ofot the obtained ternal reflectionreflection contiguration configurationot the ofin thefilling infillingdritt was drift was cores show a very good correlation withwith GPRGPR resultsresults andand controlled by intensifiedintensified oceanocean currentscurrents inin thethe southernsouthern permit an evaluation ofof thethe historyhistory otof thethe lagoons.lagoons. GoM during the Cenozoic, in particular thethe LoopLoop CurrentCurrent The chemical features, mineralogical and grainsize and its counter flow.flow. Similarly,Similarly, thethe truncationtruncationof oftopset topset distribution correlated correlated with withtime timepermitted permittedto obtain to obtain strata in 300 m water depth are attributed toto thethe inten-inten- informationintormation about aboutclimate climatevariations, variations,Iike likeraintall, rainfall,vent vent sificationsification of ofthe theLoop LoopCurrent. Current.An Anunconformity unconformityup upto to25 25 directions, insolation insolationand andtemperature temperatureevolution, evolution,and and m below sea-floorsea-floor cancan bebe relatedrelated toto thethe Mid-PleistoceneMid-Pleistocene anthropogenic influenceinfluence caused caused by by human humanactivities activitiesin in transition. WeWe concludeconclude thatthat thethe transitiontransitionwas wasaccom- accom- the basin, likeIike installationinstallation ofof powerpower plantsplants andand itsits Iakes,lakes, panied by a time periodperiod ofof signisignificantlyficantly enhanced enhancedcurrent current irrigationirrigation activities, activities,installation installationot industrial of industrialplants plantsand and velocities. changes in land use and water related activities. Observing the evolution ofof thesethese parametersparameters itit isis ableable to see changes from industryindustry to agricultural sources, the increaseincrease ofot wastewater inputinput and changes inin the physical evolution otof thethe riverriver basin.basin.

The sediment archive of the western Campeche Bank: From Chicxulub impact to Figure a) Study area inin the southern Gulf ofot Mexico. CIC: Chicxulub Loop Current evolution impactimpact crater. b) Seasurface temperature and Loop Current (source:(source: Loop Current evolution NOAA).NOAAl C. HübscherHübscherl,1, D. NürnbergNürnberg22 1 Center fortor Earth System researchresearch and Sustainability, University of Hamburg. Email: [email protected]@uni—hamburg.de Deformation andand rheologyrheology ofof thethe CentralCentral 2 GEOMAR Helmholtz Centre fortor Ocean Research Kiel. Email: dnuerndnuern-- [email protected] Andean lithosphereIithosphere F. IbarraIbarral'z,1,2, C. B. PrezzPrezzil,i1, M. L. GómezGomez DacalDacal3,3, M. Scheck- The Cretaceous-Paleogene extinctionevent eventwas wasrespon- respon- WenderothWenderoth3'4,3,4, J. BottBott3,3, M. StreckerStrecker22 sible fortor the extinctionot of“36% ~36%ot ofknown knownmarine marinefaunal faunal 11CONICET—UniversidadCONICET-Universidad de Buenos Aires, Instituto dede GeocienciasGeociencias genera and ~76%“76% ofot known marine invertebrates. The Básicas,Basicas, Aplicadas y Ambientales de Buenos Aires (IGeBA), Buenos Chicxulub asteroid impact on the Yucatan peninsula is Aires, Argentina most likelyIikely the sole cause of rapid global climatic and and 22InstitutInstitut fürfür Erd-Erd- undund Umweltwissenschatten,Umweltwissenschaften,University Universityot ofPotsdam, Potsdam, ecologic crisis. We here suggest that the Campeche Potsdam, Germany 33GFZGFZ - German Research Center fortor Geosciences, Potsdam, Germany Bank (also known as Yucatan Shelf or Yucatan Carbonate 44RWTHRWTH Aachen University, Aachen, Germany Platform) inin thethe southernsouthern GulfGulf ofof MexicoMexico (GoM),(GoM), whichwhich isis a classical carbonate rampramp with no or littlelittle terrestrialterrestrial Deformation processesprocesses inin thethe CentralCentral AndesAndes areare complexcomplex influx,influx, isis atfectedaffectedby bythe theChicxulub Chicxulubevent. event.At AtCampeche Campeche and heterogeneous. The location andand stylestyle otof detorma-deforma- Bank the typical platform typetype withwith aa gentlegentle basinwardbasinward tion inin thethe orogenicorogenic trontfront changechange alongalong strike.strike. NorthNorth ofof dipping surface presumably developed due to the supsup-- 22°S, a thin-skinned foldtold and thrust belt (Subandean pressed formation ofof photozoanphotozoan carbonatescarbonates inin responseresponse Ranges) progressively propagates to the east through a to topographical upwelling. décollementdecollement detached in Paleozoic units; whereas south We studied a prominent infillinginfilling drittdrifton onthe thewestern western of 22°S, thick-skinned systems (Santa Barbara System, Campeche Bank by means of multi-channel re reflectionflection Pampean Ranges) irregularly deformdetorm the foreland. PrePre-- seismics, parametric subbottom echosounding, echosounding,multimulti- vious studies have investigated the thecontrolling controllingfactors factors beam and sediment sampling during RV Meter expediexpedi-- on such heterogeneity; however, most of them have tion M94M94 inin 20132013 (see(see Figure).Figure). TheThe seismicseismic datadata showshow aa focusedtocused either on the uppermost crust (i.e.(i.e. sediments headwall scarp and basal shear surface of a mass transtrans-- and inherited structures) or the nature ofot the subducsubduc-- port complex. We postulate that the shear surface is covcov-- tion zone. zone. In Inthis thiscontribution contributionwe analyze we analyzethe link the be- -link be ered from ca. 100 ms TWT thick breccia resulting tromfrom tween the observed deformationdetormation andand thethe physicalphysical statestate the Chicxulub impact.impact. Iflt this interpretation isis correct,correct, thethe of the lithosphere.Iithosphere. We have previously published a 3D overlying strata comprise almost the entire CenozoicCenozoic suc-suc- data-constrained density model of the region validated cession. The main portion ottheof the massmass transporttransport depositsdeposits through forward modeling ofot the Bouguer anomaly. isis ratherrather locatedlocated at the lowerlower slope and the adjacent baba-- Based on this model and published values ofot thermal sin floor.floor. AA so-calledso-called intillinginfillingdritt drifttilled filledthe theaccommoda- accommoda- conductivity and andradiogenic radiogenicheat heatproduction productionfor ditter- for- differ 54 ABSTRACTS ent rock types, we calculated the conductive thermal thermal Further to the original application of ofthe thework workflowflow to to fieldfield forfor steady-statesteady-state conditions.conditions.Subsequently, Subsequently,using usingthe the sandstone, cataclasite in peak-ring rocksrocks of the crater is obtained temperatures and published mechanical propprop-- classifiedclassified basedbased onon thethe amountamount ofof matrixmatrix inin cataclasitecataclasite erties ofof rocks,rocks, wewe calculatedcalculated thethe maximummaximum differentialdifferential and ultracataclasite. stress for brittle (Byerlee”s(Byerlee“s Iaw)law) andand ductileductile(dislocation (dislocation QuantificationQuantification of ofthe thefractal fractaldimension dimensionwas wasconduct- conduct- creep and dislocation glide)glide) behaviorsbehaviors atat eacheach X-Y—ZX-Y-Z posi-posi- ed by calculating D-valuesD-values ofof cataclasitecataclasite inin thinthin section.section. tion. Analysis ofofthe the fractal dimension required the implemenimplemen-- tation ofof newnew toolstools inin SAGASAGA GISGIS toto thethe regularregular workworkflow.flow. These tools include mathematical techniques, techniques, notably notably 1 5.1} clusterCluster and principal component analyses, in order to EÜ'S 14.13 enhance the precision of results. However, usage of the 14.6 additional tools required higher computing power and, 14;: additional tools required higher computing power and, 22'5 14-2 thus, longerlonger processing times. To To circumvent circumventthese theseis- is- 14.1} Pan-n) sues, we had to reduce the resolutionresolution oftheof the thin—sectionthin-section 13.1% (Ing imagesimages inin SAGA GIS slightly to ensure avoiding lossIoss of sigsig-- 13.6 24'5 13-4 nificantnificant image imagedata dataand, and,as asa consequence, a consequence,preserving preserving arrangth 13.2 the entire geologicalgeological information.information. 1 3 [II

agra:ed The fractal dimension is higher in ultracataclasite than EE'S 12-5 ‘_E 12.5 inin cataclasite (see(see figure).figure). However, However,both bothcataclasite cataclasite 12-11 types show similar sphericity. InIn contrast to cataclasite, 12-2 EE'S the shape-preferred orientation isis wellwell evidentevident inin ultra-ultra- 12.ICII cataclasite in almost half of the samples. Results seem to point to a gradient between the two cataclasite types 1J km 2111-1 km 4ÜÜ km and, thus, a single formation process processof ofcataclasite. cataclasite.In In E Hiatoric earthquakea U Active faults After Üncken et al. {21211216} conclusion, integrating toolstools intointo thethe regularregular workworkflowflow of of SAGA GIS leads to a more efficientefficient and andversatile versatilework- work- Finally, we constructed yield strength envelopes (YSE) flowflow capable capable of ofdetermining determiningthe thefractal fractaldimension dimensionof of and maps of integrated strength. Interestingly, our ourre- - re rocksrocks characterized by fine-grainedfine-grained matrices, matrices,such suchas as sults show a correlation betweenbetween thethe observedobserved deforma-deforma- cataclasite and volcanic rock. tion andand thethe strengthstrength ofof thethe Iithosphere.lithosphere. IVIostMost seismicseismic . 1 _' - .-:'-. '. . events and active faults are clustered in the transition ' ._ ‚ -. ultracataclamte events and active faults are clustered in the transition - ä J— . - _ " 1 „""5.J'._ .‚ „r:- between domains of weak and strong lithosphere.Iithosphere.

InvestigationInvestigation of offractal fractaldimensions dimensionsof ofimpact- impact- inducedinduced cataclasite of the Chicxulub impactimpact crater based on an improved semi-automatic imageimage segmentation workworkflowflow using usingSAGA SAGA GIS S. KöllnKöllnl,1, O. ConradConradz,2, U. RillerRiller11 11UniversitätUniversität Hamburg, Institut fürfür Geologie,Geologie, Hamburg,Hamburg, GermanyGermany -fl. _ _. . - .-.'.-' 11 u .- . _ . :J _ .. 'n.‚ 1 .. _ -.' "I- '|_I' ". —:| 22UniversitätUniversität Hamburg, Institut fürfür Geographie,Geographie, Hamburg,Hamburg, GermanyGermany FafliEI-E SiIE' [IIITI] S 'r-' JÜ D EU - 5C" = l-1-II| - E-El l:l EG - FD = E-EI - 'HCI - III-II- - ECU E 'Jl‘lIIIEI’I'lIfIEI: - IÜ-EÜ I:I 3Ü--7|C I:I EÜ-EÜ I:.l FC-EU figü-IÜÜ l__—.l l‘EÜÜ

A semi-automatic imageimage segmentationsegmentationwork workflowflow is isim- im- plemented in the open-source GeographicGeographie Information System (GIS) software SAGASAGA GISGIS (System(System forfor AutomatedAutomated Future offshore researchresearch activitiesactivitiesin in GeoscientificGeoscientific Analyses). Analyses).Speci Specifically,fically, application applicationof an ofan Northern Chile using RV SONNE automated seeded-region growing algorithm classifiesclassifies 1 1 petrographic thin-sectionthin—section images imagesby bypolygonization polygonizationof of H. KoppKoppl,, D. LangeLange1 the grain fabric. Polygonization isis basedbased onon spectralspectral in-in- 11GEOMARGEOMAR Helmholtz Centre for Ocean Research Kiel, Dynamics of the formation ofof individualindividual mineralmineral phasesphases andand isis usedused forfor as-as- Ocean Floor, Kiel, Germany sessing particle sizesize distributiondistribution(PSD). (PSD).The Thework workflowflow was was The northern Chilean margin has been the target site of developed originally for petrographic characterization ofof numerous previous research cruises to the area, includinclud-- weathered subarkose sandstone (Asmussen et al., 2015). inging the recentrecent 2016 PICTURES cruise (MGL1610)(IVIGL1610) of RV InIn our case, the workflowworkflow is isapplied appliedto toquantitatively quantitatively Langseth. To foster future research activitiesalong alongthe the characterize impact-induced cataclasite in granitoid tartar-- Chilean trench system, we are planning two research get rock of the 66 MaIVIa Chicxulub impact crater (Mexico).(IVIexico). ABSTRACTS 55

cruises on the German RV SONNE, which have been the area of the today“stoday”s South Atlantic passivepassive continen-continen- granted but are not scheduled yet tot0 sail. The PISAGUA tal margin (SAPCM:(SAPCIVI: e.g. between SãoSäo Paulo and Laguna) cruise will target the 2014 Iquique Mw 8.1 earthquake of south-eastern Brazil underwent subduction, followedfollowed rupturerupture area using high-resolution controlled-source controlled-source by the collision of the contemporary plates of South seismic experiments tot0 elucidate the structural controls America and Africa creating a aNeoproterozoic Neoproterozoicorogeny orogeny on the megathrust slip. Although the 2014 Iquique sese-- within the supercontinent Gondwana. Gondwana.During Duringthe thePal- Pal- quence ruptured a well-known seismic gap where sigsig-- aeozoic and Lower MesozoicIVIesozoic (stage 1), the future SAPSAP-- nificantnificant strainstrain hashas accumulatedaccumulated sincesince 1877,1877, thethe gapgap onlyonly CM,CIVI, as an intracratonic area, experienced erosion, denudenu-- broke partially. The Thecruise cruiseworking workingplan planis Iaid is out laidt0 outto dation ofof thethe NeoproterozoicNeoproterozoic mobilemobile beltsbelts (Pan(Pan African/African/ complement the results from the PICTURES cruises. We Brasiliano orogeny), and large basin formation (Parana (Paraná will use 3D and 2D seismic refraction proprofilingfiling in inaddition addition Basin) (stage 2). Possibly plume-driven pre- to syn-rift to passive seismology recordingsrecordings using ocean bottom (embryonic),(embryonic), ocean spreadingspreadintg> (juvenile),(juvenile), and post-break seismometers. The experiment is locatedIocated offshore thethe In-In- up (mature) processes led tot0 the recent evolution ofof thethe tegrated Plate Boundary Observatory (IPOC), where richrich SAPCMSAPCIVI since the Upper MesozoicIVIesozoic (stage 3). geophysical datasets during the interseismic, co-seismic Multi—chronometer thermochronological müdelling nf and post-seismic phases are available. In conjunction the Late Neeproteroaoic t0 recent t-T—evoiution with high-resolution bathymetrybathymetry mapping,mapping, thethe datadata willwill of the SE coastal region of Brazil serve a structural comparison ofofthe the overridingoverridinxg> continencontinen-- "--|-—-— ._J—‘I .m .I'|.|-‘-II tal crust and the oceanic subducting slabslab inin thethe regionregion ofof the 2014 IquiqueIquique event (Pisagua(Pisagua earthquake) between 18.5°S and 22°S. The second cruise (COMBO:(COIVIBO: Conjoint monitoring of the ocean bottom offshoreoffshoreChile) Chile)focuses focuseson onGeoSEA GeoSEAar- -ar rayray deployment sites. InIn 2015 during RV SONNE cruise 244-GeoSEA, three seafloorseafloor geodetic geodeticarrays arrayswere werein- in- stalled offshore northernnorthern ChileChile onon thethe Iowerlower andand middlemiddle continental plateplate asas wellwell asas onon thethe outerouter riserise t0to recordrecord seafloorseafloor deformation.deformation.High-resolution High-resolutionimages imagesof ofthe thear-- ar rayray sites inin conjunction with withOBS OBSrecordings recordingswill willyield yield informationinformation on onthe theIocal localsubsurface subsurfacet0 toidentify identifyactive active faults. Ground-truthing using a remotelyremotely operated veve-- hicle (ROV) and sampling of active faultfault zoneszones comple-comple- —1li'i- ment the seismic studies. Knowledge ofofthe the structures at depth below the seafloorseafloor geodeticgeodetictransponder transponderstations stations

Ü is still lacking. However, this information is crucial t0 dis- is still lacking. However, this information is crucial to dis- Legend tinguish betweenbetween geodeticgeodeticsignals signalsrelated relatedto tothe thedegree degree of interseismic locking or creep, and the distribution ofof

deformation alontg> alongthe theplate plateboundary boundaryand andwithin withinthe the lllll overridingoverridintg> plate. ||1„._|_„.:_„; L:1_'|'-:_:-.':„|::. E .__ ._ .. . I..‚-||..-v.-_--.I_I.'-‚- - '„ ..-.- :„-...-r- -'- |-. -'. du-n._-|-.;‚-||‚ { _ _ IL'IHLI. {I |:'H"-1 l: I. .-- For the firstfirst time,time,this thisresearch researchaims aimst0 toreconstruct reconstructthe the Multi-chronometer thermochronologicalthermochronological syn- tot0 post-orogenic t-T-evolutiont-T—evolution of ofNeoproterozoic Neoproterozoic modelling of the Late Neoproterozoic to basement rocks of the SE coastal region of Brazil covercover-- recent t-T-evolution ofof thethe SESE coastalcoastal regionregion inging the entire geologicalgeological evolutionevolutionsince sincethe theLate LateNeo- Neo- proterozoic. Therefore, this study uses geochronological of Brazil and thermochronological data combined with numerinumeri-- F. KrobKrobl,1, U. A. GlasmacherGlasmacherl,1, M. KarlKarll,1, M. PernerPernerl,1, P. C. cal modelling. This includes published geochronological HackspacherHackspacherz,2, D. F. StockliStockli33 data of Neoproterozoic basement samples such as U-Pb, 11HeidelbergHeidelberg University, Institute ofof EarthEarth Sciences,Sciences, Heidelberg,Heidelberg, Ger-Ger- Sm-Nd and Rb-SrRb—Sr analyses, and low temperature therther-- many mochronology (LTT) data revealed by K/Ar, 40Ar/39Ar 2 2UniversidadeUniversidade Estadual Paulista, , Departamento de Petrologia e MetaMeta—- analyses. To this existing LTTLTT datadata set,set, wewe reportreport newnew ap-ap- logenia,logenia, InstitutoInstituto dede GeoscienciasGeosciências ee CienciasCiências Exatas„Exatas,, RioRio Claro,Claro, BrazilBrazil 33UniversityUniversity of Texas, Department of Geological Sciences, Austin, atite (AFT)(AFT) andand zirconzircon (ZFT)(ZFT) fission-track,fission-track,and and(U-Th-Sm)/ (U-Th-Sm)/ Germany He (AHe, ZHe) data. Numerical modelling ofofthat that LTT data attached toto thethe existingexistinggeochronological geochronologicaldata dataindicates indicates South-eastern Brazil is as an important geological archive the following evolution: for understanding and reconstructingreconstructing variousvarious plateplate tec-tec- • 0 -St-Stageage 1:1: InIn the central part of the future SAPSAP-- tonic stages of the Wilson Cycle. InIn the Neoproterozoic, CM,CIVI, the Pan African/Brasiliano post-orogenic cooling and 56 ABSTRACTS exhumation (uplift(upliftand anderosion erosionof ofNeoproterozoic Neoproterozoicrocks rocks the depression in which the lakesIakes are located,located, and a secsec-- to the surface) history occurs in three phases: (i) rapidrapid ond, seagoing drilling phase of the project will complecomple-- LateLate Neoproterozoic exhumation, (ii)(ii) aa periodperiod ofof relativerelative ment the lakeIake drilling, to understand the evolution ofof thethe thermal stability (temperatures of about 200-300°C)ZOO-300°C) inin entire complexcomplex margin.margin. which rocks reside at upper crust levelsIevels during the Early Drilling of the Nicaraguan lakes,Iakes, under the broad umum-- Cambrian to Devonian, and (iii) a second rapid exhumaexhuma-- brella of Paleoclimate, Paleoenvironment, and PaleoPaleo-- tion phasephase movingmoving thethe NeoproterozoicNeoproterozoic basementbasement rocksrocks ecology will have broad scientificscientific and andsocio-economic socio-economic to the surface during the Devonian. The northern and impactsimpacts andcontribute to three major societal themes southern parts indicate a distinct post—orogenicpost-orogenic exhuma-exhuma- addressed by ICDP: Climate & Ecosystems, Deep BioBio-- tion suggestingsuggestingfaster fastercooling coolingand andexhumation exhumationfrom fromthe the sphere, and Natural Hazards. The workshop will foster LateLate Neoproterozoic to Devonian/Carboniferous than in internationalinternational coIIaborationscollaborationsand andserve serveto tofurther furtherde definefine the central section. and refinerefine thethe scientiscientificfic objectives objectivesand andhypotheses hypothesesout-- out • 0 -St-Stageage 2: A phase of subsidence leadingIeading to the linedIined inin the drilling workshop proposal.Seismic pre-site formation ofof thethe ParanaParaná BasinBasin followedfollowed byby pre-pre- toto syn-riftsyn-rift surveys in the lakesIakes approve the feasibility to drill, and processes and the emplacement of the Paraná-EtendekaParana-Etendeka will be continued. floodflood basalts.basalts. Long, continuous sediment sedimentcores coresfrom frommultiple multiplesites sites • 0 -St-Stageage 3: Post-South Atlantic breakbreak upup process-process- inin LakesLakes Managua and Nicaragua will provide the oldestoIdest es, such as erosion and exhumation. lacustrinelacustrine recordsrecords inin continental Neotropics. Neotropics.They Theywill will enable (a) development of a Neotropical environmental and paleoclimate record, e.g. past moisture availabilavailabil-- Paleoclimate, paleoenvironment, and ity/sourceity/source , (b)(b) determination ofof thethe timestimesand andrates ratesof of paleoecology of Neogene Central America: marine transgressions and regressions, their tectonic and climatic controls controls and andecological ecologicalconsequences, consequences,(c) (c) Bridging continents and oceans (NICA- Bridging continents and oceans (NICA- investigationinvestigation of ofrecurrence recurrencerates ratesand magnitudes and magnitudesof of BRIDGE) natural hazards, e.g. eruptions, Iandslides,landslides, earthquakes,earthquakes, S. KutterolfKutterolfl,1, M. BrennerBrennerz,2, A. FreundtFreundtl,1, J. KallmeyerKallmeyer3,3, S. hurricanes, (d) constraints on the timing andand magmaticmagmatic KrastelKrastel“,4, S. KatsevKatsev5,5, A. MeyerMeyer",6, L.L. PérezPerez7,7, J. RauschRauschs,8, A. compositional changeschanges duringduring shiftsshiftsof ofthe thevolcanic volcanicarc, arc, SaballosSaballosg,9, A. SchwalbSchwalb7,7, W. StrauchStrauch99 (e)(e) linkageslinkages between longtermlongterm terrestrial and marine papa-- 11GEOMAR,GEOMAR, Helmholtz Centre for Ocean Research, Kiel, Dynamics of leoenvironmentalIeoenvironmental records,records, (f)(f) long-termIong-term basin developdevelop-- the Ocean Floor, Kiel, Germany ment, and the deeper structure of western Nicaragua, 22UniversityUniversity of Florida, Gainesville, United States and (g) assessment of climatic, geologicgeologic andand (Holocene)(Holocene) 3 3HelmholtzHelmholtz Centre Potsdam-GFZ,Potsdam—GFZ, Potsdam, Germany anthropogenic influencesinfluences onon biodiversitybiodiversity andand limnologi-limnologi- 44Christian—Albrechts—UniversitätChristian-Albrechts-Universität zuzu Kiel,Kiel, Kiel,Kiel, GermanyGermany 55UniversityUniversity of Minnesota Duluth, Duluth, United States cal variables, e.g. past freshwater/saltwater phases, initiiniti-- 66UniversityUniversity of Konstanz, Konstanz, Germany ated by tectonics, and consequent effects onon micro-micro- andand 77TechnischeTechnische Universität Braunschweig, Braunschweig, Germany macrobiota. 88ParticleParticle Vision,Vision, Fribourg,Fribourg, SwitzerlandSwitzerland 99InstitutoInstituto NicaragüenseNicaragüense dede EstudiosEstudios Territoriales,Territoriales, Nicaragua,Nicaragua, Managua,Managua, Nicaragua Structural control on carbon dioxide diffuse InIn March 2020, we will hold a workshop inin Nicaragua to degassing at the Caviahue —– Copahue Volcanic plan scientificdrilling drillingin inLakes LakesNicaragua Nicaraguaand andManagua. Managua. Complex, Argentina Both are located in a trench-parallel half graben that hosts the volcanic front and that developed during or pripri-- M. C. LambertiLambertil,1, N. VigideVigidel,1, S. VenturiVenturiz,2, M. AgustoAgustol,1, D. or to the Pliocene, as a consequence of subduction-resubduction-re-- YagupskyYagupskyl,1, D. WinocurWinocurl,1, H. BarcelonaBarcelonal,1, M. L. Vélezvelezl,1, F. latedIated tectonic changes. The lakesIakes are uniquely suited for TassiTassi22 multidisciplinary scientiscientificfic investigation investigationof Iong, of long,continucontinu- 11IntitutoIntituto dede EstudiosEstudios AndinosAndinos DonDon PabloPablo Groeber,Groeber, UniversityUniversity ofof BuenosBuenos ous sediment profiles becausebecause ofof their:their: 1)1) Ionglong recordsrecords Aires, Geology, Buenos Aires, Argentina 2 (several(several Myrs) of terrestrial and relatedrelated marine basin dede-- 2UniversityUniversity of Florence, Florence, Italy velopment at the southern Central American margin, 2) The Caviahue — – Copahue Volcanic Complex (CCVC) is alternating lacustrinelacustrine andand marinemarine environments,environments, 3)3) prox-prox- locatedlocated within the Andean Cordillera, inin the NeuquénNeuquen imity to both the oIder and the younger volcanic arcs, imity to both the older and the younger volcanic arcs, province, Argentina. This Thismagmatic magmaticsystem systemlies lieswithin within which were separated by slab roIIback, 4) significance as which were separated by slab rollback, 4) significance as the northern termination of ofthe theLiqui Liquiñefie — qui – Ofquifault fault a hot spot for endemism, 5) strategic Iocation for study a hot spot for endemism, 5) strategic location for study zone, a 1,200-km-long1,200-km-Iong intra-arc strike-slip fault system. of the great American biotic interchange.interchange. TheyThey offerofferthe the Fluid emissions at this active volcanicvolcanic complexcomplex areare fedfed byby opportunity to combine seismological, volcanological, opportunity to combine seismological, volcanological, a hydrothermal reservoir located at 800 m depth, mostly paleoclimatological, paleoecological, and paleoenvironpaleoenviron-- rechargedrecharged by meteoric water. The reservoirreservoir isis heated by mental studies in the ocean and on land. The Sandino a magmatic bodybody locatedlocated atat 55 kmkm depth,depth, whichwhich alsoalso pro-pro- Basin, offshore Nicaragua,Nicaragua, isis thethe oceanicoceanic continuationcontinuationof of vides the system with magmatic gases.gases. FluidFluid emissionsemissions ABSTRACTS 57 at the CCVC release over 200 tons per day of soil diffuse tion. However,However, thethe electromagneticelectromagneticwaves wavesused usedby bythese these CO2.C02. The aim of this study is to evaluate the control that techniques do not penetrate into water and therefore the localIocal structural scenario exerts on CO2C02 flow,flow, fromfrom thethe geodetic informationinformationfor forthe theoffshore offshoredomain domainis issparse. sparse. hydrothermal reservoir to the surface. The GeoSEA (Geodetic Earthquake Earthquake Observatory Observatoryon onthe the The correlation betweenbetween diffusediffusedegassing degassinganomalies anomalies SEAfloor) array arrayuses usesacoustic acousticranging rangingtechniques techniquesbe-- be and geological brittle structuresstructures waswas evaluatedevaluated byby per-per- tween stations onon thethe seaseafloorfloor for forrelative relativepositioning. positioning. forming a spatial analysisanalysis withwith thethe useuse ofof geochemicalgeochemical We use data from 23 autonomous acoustic transponderstransponders and structural data. A total amount of 1,819 measuremeasure-- installedinstalled inin three deployments locatedlocated on the outer riserise ments of CO2C02 fluxflux andand soilsoil temperaturetemperature werewere performed,performed, and on the marine forearc of the northern Chile subducsubduc-- over an area of ~10“'10 km2. CO2C02 fluxflux datadata waswas processedprocessed tion zonezone (“21°S).(~21°S). TheThe networksnetworks areare locatedlocated immediatelyimmediately inin order to map the spatial distributiondistributionof ofdiffuse diffuseemis- emis- south of the IquiqueIquique 2014 Mw 8.1 rupture zone. Stations sions. The localIocal structure was characterized by means of were deployed in December 2015 and were mostly rere-- satellite images and digital elevationeIevation modelsmodels interpreta-interpreta- cording until JuneJune 2018.2018. tion. The geodetic networks networksmonitor monitorcrustal crustaldeformation deformation The geochemical analysis showed well-definedweIl-defined C02 CO2 of the seafloorseafloor withwith thethe targettarget toto quantifyquantifyinterseismic interseismic diffuse degassingdegassing anomaliesanomalies inin fourfour hydrothermalhydrothermal sitessites deformation. Although Althoughwe weachieve achievea mm-scale a mm-scalepreci- - preci within the CCVC. These anomalies follow clear linear sion with our acoustic ranging ranging system, system, we we observe observeno no trends that can be clustered in different domains domainsre- - re significantsignificant deformationdeformationabove aboveour ourresolution resolutionIimits. limits.We We garding their orientations. TheThe principalprincipal domaindomain strikesstrikes compare our observations withwith surfacesurface strainstrain modelsmodels es-es- NE-SW. The analysis of the satellite images and digital eleI-- timated usingusing onshoreonshore cGPScGPS stationsstationsof ofthe thePlate PlateBound- Bound- evation modelsmodels allowedallowed discriminatingthreediscriminating threesets setsofstruc- of struc- ary Observatory Chile (IPOC). The predicted strains are of tures. The main set isis constituted byby NE-SWNE-SW lineaments;lineaments; a similar order of magnitude compared to the strain resres-- the second set is constituted byby NW-SENW-SE lineaments;lineaments; thethe olution ofof thethe network.network. Furthermore,Furthermore, wewe showshow pressurepressure third set isis composed by E-W oriented lineaments.Iineaments. Two data for all three networks. Although the resolution ofof length-weightedIength-weighted roserose diagrams were computed, plotting the pressure sensors is inin the cm-range, the data do not diffuse degassing degassinganomalies anomaliesdirections directionsand andgeological geological revealreveal any sudden vertical movements movementsof ofthe thesea floor, seafloor, brittle structuresstructures directions.directions.The Thesimilarity similarityof ofthese theseplots plots indicatingindicating absenceabsence ofof verticalverticalcrustal crustalmovement. movement. suggests that the main NE-SWNE—SW structures constitute thethe preferential pathwayspathways forfor soilsoil diffusediffuseC02. CO2.This Thisalso alsosug- sug- gests that the two secondary sets act as fluidsfluids pathwayspathways Exhumation historyhistory ofof thethe ArgentineArgentineEastern Eastern as well. Cordillera at 23°S I - r - ' -. .„‚

u 1 2 1 :| -'.I In|11|||fu|j|||i||fu| l||| |‘.'. A. T. LapianaLapianal,, E. SobelSobelz,, C. E. deldeI PapaPapal,, C. Montero-IVIontero- -‘ LópezLopez3,3, S. ZapataZapata2'4'52,4,5 .P. / .‘Hlllig'lIZIJ.lll'-|_'.l12l-._'il| ‚ ..n 11CentroCentro de Investigaciones enen CienciasCiencias dede Iala Tierra-Tierra- CONICET—UNC,CONICET-UNC, . CórdobaCördoba Capital, Argentina 22InstitutInstitut fürfür Geowissenschaften,Geowissenschaften,Universität UniversitätPotsdam, Potsdam,Potsdam, Potsdam, Germany 33IBIGEO,IBIGEO, Universidad Nacional de Salta-CONICET, Salta, Argentina 44SmithsonianSmithsonian Tropical Research Institute, Panama,Panamá, UnitedUnited StatesStates 55DepartmentDepartment of Geology & Geophysics, University of Missouri-Rolla, Missouri-Rolla, United States

The onset of the Andean Orogeny in the Central Andes remainsremains a topic of active research.research. ManyMany studiesstudies investi-investi- SeafloorSeaﬂoor geodesygeodesy toto monitormonitor deformationdeformation gating surfacesurface upliftupliftgave gaveconcentrated concentratedon onthe theregion regionbe- be- offshore NorthernNorthern ChileChile (GeoSEA)(GeoSEA) tween 22° - 26° S (see(see Reiners et al., 2014). They mostly focus on the Cordillera de Domeyko, Coastal Cordillera, D. LangeLangel,1, H. KoppKoppl,1, K. HannemannHannemannz,2, F. PetersenPetersenl,1, J. BedBed-- the southern Puna - Eastern Cordillera and the Sierras fordford3,3, S. BarrientosBarrientos“,4, E. Contreras-ReyesContreras-Reyes55 Pampeanas, while very little information informationis isavailable available 11GEOMARGEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Kiel, Germany 22UniversitätUniversität Leipzig, Institut fürfur Geophysik und Geologie, Leipzig, from the northern Puna to the Eastern Cordillera (Deek(Deek-- Germany en et al., 2005; Haschke et al., 2005; Insel et al., 2012; 33GFZGFZ Helmholtz-Zentrum Potsdam, Potsdam, Germany Reiners et al., 2014). 4 4UniversidadUniversidad de Chile, Santiago dede Chile,Chile, ChileChile The Eastern Cordillera at 23°S consists of a narrow 55UniversidadUniversidad de Chile, Departamento de GeoGeofi’sica,fisica, Santiago dede Chile,Chile, Chile zone up to 100 km wide with more pronounced strucstruc-- tural reliefrelief than the Puna, which lieslies adjacent to the Within the last decade, satellite-basedsatellite—based geodetic tech- tech- west. Itlt is characterized by three main mountain ranges niques such as GPS or InSAR have increased our knowlknowI-- and intermontane valleysvaIIeys with a NNE-SSW orientation edge about tectonic plate motions andand crustalcrustal deforma-deforma- and is delimited by fore- and back-thrust. These thick- 58 ABSTRACTS skinned faults superimpose Precambrian to Ordovician Our aim is to study these younger fault systems with basement rocks onto Mesozoic to Cenozoic sediments. respectrespect to their latestlatest tectonic activity. Therefore,Therefore, wewe col-col- Recent works have studied these major faults, as they lectedIected a dozen samples for U/Pb dating ofof volcanicvolcanic ashesashes representrepresent the recordrecord of compressional activity sincesince thethe and quarzitic gravelgravel samplessamples forfor cosmogeniccosmogenic radionuclideradionuclide Palaeogene (e.g.,(e.g.‚ Coutand et al.,al.‚ 2001; Monaldi et al.,al.‚ dating. AgeAge constraintsconstraints oftheof the tectonicalIy-imprintedtectonically-imprinted geo-geo- 2008; Insel et al.,al.‚ 2012; Montero-LópezIVIontero-Lopez et al., 2018). In morphic features will provide valuable data to enlighten order to investigate thethe temporaltemporal andand spatialspatialexhumation exhumation the past seismogenic deformation. Additional Additionalresearch research pattern ofof thisthis partpart ofof thethe AndesAndes wewe presentpresent ﬁssionfissiontrack track on these structures will include interpretation ofof seismicseismic and (U-Th-Sm)/He analysis of apatites andand zirconszircons fromfrom refractionrefraction lines,lines, analysisanalysis ofof historicalhistorical aerialaerial imagery,imagery, UAV—UAV- the Aguilar, Mal Paso and Aparzo mountain ranges.ranges. based mapping of morphological indicators and fault The distribution of ofcooling coolingages agesand andsimilar similarcooling cooling trenching. The combination oftheseof these techniquestechniques willwill helphelp patterns shownshown byby thethe AHe,AHe, AFT,AFT, andand ZHeZHe chronometerschronometers us to achieve our principal goal to characterize the neoneo-- show a rapid exhumation phasephase betweenbetween 1818 —– 7.57.5 MaMa tectonics behavior of the Puna Plateau region.region. As such which we interpret to be caused by the increase of the the resultsresults will help to decide, where shortening across Andean shortening. Exhumation andand deformationdeformationwere were the Andean orogen is accommodated and how the tectec-- coupled in space and time atat thethe easterneastern borderborder ofof thethe tonic activity hashas evolvedevolved overover time,time,which whichis iscritical criticalfor for northern Puna and throughout the Eastern Cordillera. the development of models of orogenic wedge behavior This work was supported by; FONCyT-PICT-1274FONCyT—PICT—1274 and and therefore, for understanding the growth of mounmoun-- CONICET-DFG:CONICET—DFG: „SuRface processes, TEctonics and GeoGeo-- tain belts. Furthermore, the outcome of this study will resources:resources: The Andean foreland basin of Argentina be inevitable for the assessment of natural geologic and (StRaTEGy)“.(StRaTEGy)”. geophysical hazards in the plateau region.

Neotectonics of the Andean Plateau (Puna) Geodynamic importance of the spatial G. Lauer-DünkelbergLauer-Dünkelberg11 distribution ofof monogeneticmonogeneticvolcanic volcaniccenters centers 11UniversitätUniversität Potsdam, Institut fürfür Geowissenschaften,Geowissenschaften,Potsdam, Potsdam, inin the Southern Andes between 39°S and Germany 37°S The northern Puna of Argentina comprises comprises wide wideareas areas Y. LeeLeel,1, P. L. GöllnerGöllnerl,1, U. RillerRiller11 of the Miocene San Juan del Oro surface, an erosional 11UniversitätUniversität Hamburg, Institut fürfür GeologieGeologie surface that marks the cessation ofof deformationdeformationon onthe the central Andean plateau. This observation is isbased basedon on The interplay between tectonics and volcanism is one of undeformed volcanoclastics atat itsits base,base, dateddated toto 8.88.8 toto the major, and in many aspects, unresolved chicken-and- 12.5 Ma. Some studies suggest that the deformation pro-pro- egg questions atat activeactivecontinental continentalmargins. margins.Speci Specifically,fically, cesses migrated from the Altiplano toto thethe PunaPuna andand fromfrom the influenceinfluence of ofupper uppercrustal crustaldeformation deformationstructures structures the magmatic arcarc inin thethe westwest toto thethe EasternEastern CordilleraCordillera on the development and location ofof volcanicvolcanic centerscenters re-re- and subsequently to the foreland of the eastern Andes. mains to be identified in inmany manyvolcanic volcanicarcs. arcs.Along Alongthe the Crustal seismicity and GPS measurements indicate the Southern Andean volcanic zone, individual stratovolcastratovolca-- foci of stress releaserelease inin the fold and thrust belt and the noes often formform volcanicvolcanic Iineaments,lineaments, manymany ofof whichwhich co-co- broken foreland, respectively. Our Ourpreliminary preliminaryanalysis analysis incideincide with the presence of major crustal discontinuities. of faults within the plateau suggests that this notion ofof InIn contrast to prominent volcanoes, small eruptive cen-cen- tectonic quiescence on the plateau is wrong. Fault scarps ters, polygenetic fieldsfieldsand andmonogenetic monogeneticcones conesare arehow- -how with a throw of several meters to tens of meters cut ever mostly underrepresented in volcano-tectonic studstud-- through alluvial sediments that were probably deposited ies.ies. As the activity ofof suchsuch eruptiveeruptivecenters centersis isin inmany many within the Quaternary; lacustrineIacustrine terraces of formerly cases limitedIimited to a small time window,window, theythey Iendlend them-them- extensive lakesIakes are deformed asymmetrically, and fluvialfluvial selves wellweII with regardregard to correlating individual individualpulses pulses terraces and alluvial fans are tilted. SinceSince thethe recentrecent de-de- of deformation withwith pulsespulses ofof volcanism.volcanism. Thus,Thus, theythey areare formation ofof thethe plateauplateau marginmargin isis proposedproposed toto bebe highlyhighly idealideal targets to study the influenceinfluence of ofdeformation deformationon on influencedinfluenced by by inherited inheritedcrustal crustalstructures, structures,e.g. e.g.reacti- - reacti magma eruption. vated ancient fault systems, gaining a better knowledgeknowledge Widespread Cenozoic volcanic activity inin thethe SouthernSouthern of past deformation featuresfeatures andand aa rigorousrigorous analysisanalysis ofof Andean volcanic zone between 37°S and 39°S leadIead to the recentrecent faults isis critical forfor understandingunderstanding thethe presentpresent andand formation ofof aa varietyvariety ofof volcanicvolcanic centers,centers, suchsuch asas col-col- possible future state of deformation. InIn thisthis contextcontext itit isis lapseIapse calderas, stratovolcanoes, and abundant monogemonoge-- surprising that younger fault systems have not been anaana-- netic cones.cones. AA systematicsystematicand andcomprehensive comprehensiveanalysis analysisof of lyzedIyzed inin this region,region, which, however, isis partly the resultresult of the spatial arrangementarrangement ofof especiallyespecially smallsmall eruptiveeruptivecen- cen- existing modelsmodels thatthat nono activeactivedeformation deformationoccurs occursin inthe the ters with respectrespect to regionalregional structures isis however lacklack-- central sectors of the plateau. ing.ing. InIn this study, we compiled the type and locationlocation ofof ABSTRACTS 59 volcanic centers in the Southern Andean volcanic zone. the relocatedrelocated seismicity isis mostly distributed along the We present preliminary results of a comprehensive GIS- plate interface and allowaIIow us to identify thethe boundariesboundaries based analysis of the alignment of volcanic centers and between the subducting andand overridingoverriding plate.plate. ChangesChanges their correlation withwith upperupper crustalcrustal structures.structures. VolcanicVolcanic consistent with the north-south transition from froman anac- ac- centers used for this purpose were compiled from pubpub-- cretionary toto erosiveerosive regimeregime werewere found.found. ToTo thethe north,north, lishedIished sources and satellite imageryimagery inin combination withwith inin the marine forearc section wewe imageimage areasareas withwith highhigh topographic maps. Our systematic assessmentassessment showsshows aa Vp/Vs contrast where seismicity close to the trench is lolo-- number of linear spatial assemblagesassemblages ofof mostlymostly monoge-monoge- cated. This findingfinding mightmight suggestsuggest thethe presencepresence ofof erodederoded netic conescones ofof basalticbasalticcomposition compositiontrending trendingNE-SW NE-SWin inthe the or fractured wedge capable to trigger seismicity after aa LoncopuéLoncopue trough, a pronounced topographic depression largelarge megathrust earthquake. Also, we observe a lowlow Vp of the back arc. NE-SW-trending volcanic lineamentsIineaments are regionregion which might co-locateco-Iocate to areas where slow slip at variance to the strike of prominent faults observed in events have been identified.identified. The Thesouthern southernsection sectionshows shows the study area, but correspond to the principle shortenshorten-- a wider zone of seismicity suggesting aa thickerthicker crustcrust sub-sub- inging direction inin thethe SouthernSouthern AndesAndes imposedimposed byby obliqueoblique ducting beneathbeneath thethe continentalcontinentalplate platethat thatcan canbe beassoci- associ- plate convergence. This observation suggestssuggests thatthat mono-mono- ated with the influenceinfluence ofof thethe incomingincoming CarnegieCarnegie Ridge.Ridge. genetic volcanicvolcanic centers,centers, whichwhich areare generallygenerally thoughtthought toto The presence of this large bathymetric feature also adds have been fed from the mantle, formed by localIocal NW-SE buoyancy to the incoming oceanic crust and might affectaf‘fect dilation ofof faultedfaulted crustcrust underunder overalloverall NE-SWNE-SW compres-compres- the way how stress isis releasedreleased in this area. InIn the overover-- sion. Consequently, maximum principal compression lyinglying continental crust, crust,we weobserved observedclustered clusteredshallow shallow during basaltic volcanism volcanism in inthe theLoncopue Loncopuétrough troughwas was seismicity in both northern and southern profilesprofiles whichwhich horizontal rather than vertical, asas isis commonlycommonly believed.believed. isis locatedlocated at the limitsIimits of high Vp/Vs bodies. Moreover, This calls into question thethe popularpopular back-arcback-arc extensionextension our results show how the Bahia Caraquez and Manta hypothesis for the Southern Andean volcanic zone. cluster,Cluster, both registered after thethe PedernalesPedernales earthquake,earthquake, surround a body that might correspond to a less concon-- solidated area in the marine forearc. Finally,FinaIIy, we can co- 3D seismic tomography and seismotectonics locatelocate a high Vp/Vs body locatedlocated inin the east part of the of the Ecuadorian margin inferred from the southern section toto areasareas thatthat recordedrecorded highhigh PGAPGA duringduring the Pedernales earthquake. Our resultsresults presented here 2016 Mw 7.8 Pedernales aftershock sequence 2016 Mw 7.8 Pedernales aftershock sequence highlight the heterogeneities oftheof the subductionsubductionzone zonethat that S. Leon-RiosLeon-Riosl,1, A. RietbrockRietbrockl'z,1,2, H. Agurto-DetzelAgurto-Detzel3,3, A. AlAl-- might influenceinfluence different differentstress stressrelease releasebehavior behaviorover over varadovarado“,4, A. MeltzerMeltzer5,5, B. EdwardsEdwardsz,2, C. LynnerLynner6,6, F. RolanRolan-- time andand cancan coexistcoexist andand interactinteract eveneven inin aa Iocallocal toto re-re- donedone7'8,7,8, J. M. NocquetNocquet3'8,3,8, L.L. Soto-CorderoSoto-CorderoS,5, M. RegnierRegnier3,3, gional scale along the central coastal Ecuadorian margin. M. HoskinsHoskins5,5, M. RuizRuiz4,4, P. CharvisCharvis3,3, S. BeckBeckö,6, Y. FontFont33 11KarlsruheKarlsruhe Institute ofof Technology,Technology, GeophysicalGeophysical Institute,Institute,Karlsruhe, Karlsruhe, Germany Miocene volcaniclastic forelandforeland basinbasin ininfillfill 22UniversityUniversity of Liverpool, School of Environmental Sciences, Liverpool, United Kingdom next to the exhumed North Patagonian 33Geoazur,Geoazur, Sofia-Antipolis,Sofia—Antipolis, France France Andean Batholith: a record of collapse- 44InstitutoInstituto GeoGeofisicofisico de deIa laEscuela EscuelaPolitecnica PolitecnicaNacional, Nacional,Quito, Quito,Ecuador Ecuador 55LehighLehigh University, Department of Earth and environmental sciences, caldera eruptions? Bethlehem, United States Bethlehem, United States 1 1 1 1 2 66UniversityUniversity of Arizona, Department of Geosciences, Tucson, United M. LópezLöpezl,, J. BucherBucherl,, M. GarcíaGarcial,, L.L. D‘EliaD’Elial,, A. BilmesBilmesz,, J. States R. FranzeseFranzese11 7 7SorbonneSorbonne UniversitUniversite,e, Paris, France 11CentroCentro de Investigaciones GeolögicasGeológicas (CONICET(CONICET -- UNLP),UNLP), LaLa Plata,Plata, 8 8InstitutInstitut dede PhysiquePhysique dudu GlobeGlobe dede Paris,Paris, Paris,Paris, FranceFrance Argentina 22InstitutoInstituto dede PaleontologiaPaleontología yy GeologiaGeología dede lala PatagoniaPatagonia (IPGP)(IPGP) -- CONI-CONI- Based on seismicity recorded by the permanent EcuaEcua-- CET, Puerto Madryn, Argentina dorian seismic network and our large emergency array installedinstalled shortly afterafterthe the 20162016 MwMw 7.87.8 PedernalesPedernales earth-earth- The nature of Andean magmatism andand theirtheir tectonictectonic re-re- quake, we derived a 3D velocity model of central coastal gimes results from variations inin thethe angleangle ofof subductionsubduction Ecuador using a localIocal earthquake tomography. We manumanu-- of the Nazca and Antartic oceanicoceanic platesplates beneathbeneath SouthSouth allyaIly analysed the seismic waveform recorded on the amam-- American plate. For the North Patagonian Andes, a flatflat phibious array to determine high quality P- and S-wave slab type subduction waswas proposedproposed toto thethe middlemiddle Mio-Mio- arrival times. JoinedJoined inversionsinversions forfor earthquakeearthquake Iocations,locations, cene. At one time, forelandforeland basinsbasins werewere filledfilledwith withtens tens velocity structure and, if applicable, station correction correction of volcaniclastic materialsmaterials thatthat werewere distributeddistributed forfor moremore terms were carried out with increasingincreasing complexity from than 30.000 km2. InIn order to understand the relationrelation-- 1D to 3D. ship between tectonics and magmatic–volcanicmagmatic—volcanic system system From the tomography we imaged the subducting interactions,interactions, wewe analysisanalysis thethe MioceneMiocene volcaniclasticvolcaniclasticin infillfill oceanic Nazca plate down to 50 km depth inferred by succession of a basin locatedlocated next to the exhumed AnAn-- a high Vp feature dipping eastward. The distribution ofof dean Batholith. 60 ABSTRACTS

The CollónCollön Cura basin was configuredconfigured betweenbetween 1616 andand structure and megathrust geometry on the behavior of 14.4 Ma due to the uplift ofof thethe northnorth PatagonianPatagonian An-An- continent-ocean subductionsubductionplate plateboundaries. boundaries.On OnApril April des towards the west and the SañicóSa'nicö Massif towards the 1, 2014, a magnitude Mw 8.2 earthquake ruptured the east, whereas the uplift ofof thethe NorthNorth PatagonianPatagonian AndesAndes marine forearc offshore Iquique Iquiqueand andPisagua Pisaguabetween between continues upup toto 4.8Ma.4.8Ma. AtAt thethe samesame time,time,a avolcaniclastic volcaniclastic 18.5°S to 21°S, covering an area spanning about 20% of succession of tuffstuf‘fs andand Iapillilapilli tuf'fstuffswere weredeposited depositedinto into the regionregion previously referredreferred to as a seismic gap. This the basin with up to 150 m-thick that reachreach an estimated event did not compensate the entire slip slipde deficitficit and and volume of ~1800“1800 km3. The succession is limitedIimited below hence the continuous potentialpotentialfor fora alarge largerupture rupturemakes makes by an angular unconformity and above by a regional a close investigation of ofthe thefault faultslip slipzone zonetimely. timely. erosional unconformity and is characterized by three InIn 2016 RV Marcus G. Langseth set out to acquire sections. The TheIower lowerand andupper uppersections sectionsare composed are composed deep-penetrating,deep—penetrating, high-resolution high-resolutionseismic seismicdata datain the in the of ~50“50 - 70 m-thick of massive to roughly stratifiedstratified and and 2014 rupture area during cruise MGL1610 under the moderate-sorted vitric-rich lapilliIapilli tuffs. TheThe middlemiddle sec-sec- framework of the PICTURES (Pisagua-Iquique(Pisagua-Iquique Crustal ToTo-- tion isis characterizedcharacterized byby 1010 toto 3030 mm thickthick ofof lenticularlenticularbeds beds mography to Understand the Earthquake Source) projproj-- composed of massive, vitric-rich and moderately sorted ect. A grid of seismic reflectionreflection and andrefraction refractionprofiles profiles lapilli-tuffs.lapiIIi-tuffs. GeochronologicalGeochronological andand magnetostratigraphicmagnetostratigraphic were acquired to document the geologic structure of the analysis constrain the volcaniclastic successionsuccession betweenbetween upper and lowerIower plates and the rheological properties ofof 15.160 and 12.049 Ma and reveals that the whole sucsuc-- the boundary zone between them. Here we present firstfirst cession has a normal polarity paleopole dated between resultsresults from processing of lineline MC25, which isis locatedlocated in 15.160 and 15.032 Ma, determining a maximum deposideposi-- the southern part of the 2014 rupturerupture area. Due to the tional timetimeprocess processof of128.000 128.000years. years.Nevertheless, Nevertheless,sedisedi- starved sediment and strong signal, the seafloorseafloor multiplemultiple mentological features of the succession indicate that dede-- isis quite strong inin the shallow part. The shot intervalinterval of posits were probably deposited even in a much shorter the rawraw data isis 125 m, which leadsleads to prominent aliasalias-- time span.span. inging inin the original gather. To dismiss these aliased data, The deposition ofof thethe volcaniclasticvolcaniclasticsuccession successionwas wasin- in- shot interpolation isis appliedapplied inin thethe rawraw data,data, leadingleading thethe terpreted as short-term processes associated with PDC´sPDC’s shot interval from 125m to 15.625m. As the result is not occurred during the main structural configurationconfiguration of ofthe the a multiple forfor thethe receiverreceiver interval,interval, anan irregularirregular interpo-interpo- basin that matches with the contractional flat flatslab slabre- re- latorlator module was used to interpolateinterpolate itit to 12.5 m. After gime. The volcaniclastic successionsuccession oftheof the CollonCollón CuraCura ba-ba- that, the shot gathers have no aliased components asas-- sin would record a huge volcanic eruption depositeddeposited byby sociated with them and meet the standard coordinate catastrophic events in a many or nested collapse-calderacoIIapse-caldera system. Several processing techniques are introduced scenario. The origin of the calderas would be genetically with the aim to increase the signal/noisesignaI/noise ratio. FocusingFocusing associated with Miocene igneous rocks of the North PaPa-- on the multiples, wewe utilizeutilizeenhanced enhancedmultiple multiplesuppres- suppres- tagonian Batholith, that was exhumed in the North PataPata-- sion techniques, e.g., wave equation multiple multipleattenua- attenua- gonian Andean axis after thethe flatflatslab slabregime. regime. tor, deterministic water-Iayerwater-layer demultiple,demultiple,interbed interbedmul- mul- tiple predictor,predictor, anomalousanomalous amplitudeamplitude noisenoise attenuation,attenuation, adaptive filterfilterand andmultichannel multichanneldip dipfilter filterto improveto improvethe the Seismic processing strategy and crustal imagingimaging quality at greater depth. structure of the April 1, 2014 Mw 8.2 rupture area offshore NorthernNorthern ChileChile fromfrom seismicseismic Crustal deformation andand Ioadingloading effectseffectsin in reflectionreflection data data southern Patagonia B. MaMal,1, D. KläschenKläschenl,1, H. KoppKoppl,1, A. TrehuTrehu22 E. MarderwaldMarderwaldl'z,1,2, A. RichterRichter1'3'2,1,3,2, L. MendozaMendozal'z,1,2, J. L.L. 11GEOMAR — Helmholtz—Zentrum für Ozeanforschung Kiel, Kiel, Ger- GEOMAR - Helmholtz-Zentrum für Ozeanforschung Kiel, Kiel, Ger- 4 1 3 3 many HormaecheaHormaechea“,, R. PerdomoPerdomol,, A. GrohGroh3,, M. HorwathHorwath3,, J. 22OregonOregon State University, College of Earth Ocean and Atmospheric M. Aragon PazPazl'z,1,2, P. BuschBusch3,3, M. ScheinertScheinert3,3, M. KappelsKappels-- Sciences, Corvallis, United States bergerberger3,3, R. DietrichDietrich33 11UniversidadUniversidad Nacional de La Plata, Laboratorio MAGGIA, La Plata, The northern Chilean margin has long been recognized Argentina as an erosive margin, which has been active sincesince thethe Ju-Ju- 22NationalNational ScientiScientificfic and andTechnical TechnicalResearch ResearchCouncil Council(CONICET), (CONICET),La La rassic.rassic. Along the Chilean trench system, material transfer Plata, Argentina 3 changes from accretionary southsouth ofof thethe JuanJuan FernandezFernandez 3TechnischeTechnische Universität Dresden, Institut fürfür PlanetarePlanetare Geodäsie,Geodäsie, Dresden, Germany Ridge (~33°S)(“33°S) to erosive in the north offshore Antofa- Antofa- 44Estacio’nEstación AstronómicaAstronömica RíoRio Grande, Rio Grande, Argentina gasta (~23°S)(“23°S) and Iquique (~22°S).(“22°S). Because of its rich earthquake history and the systematic spatialspatialvariation variation GNSS observations weII well distributed distributedover overthe theSouthern Southern inin geologic factors that potentially affectaffectmegathrust megathrustrup- rup- Patagonian IcefieldIcefield (SPI)(SPI) regionregion havehave revealedrevealed rapidrapid upliftuplift ture, the Chile subduction zone zone isis arguablyarguably oneone ofof thethe with rates of up to 4 cm/a (Richter et al. 2016;2016,- Dietrich best places on Earth to understand the effect ofof crustalcrustal et al.aI. 2010). The magnitudes and patterns ofof verticalverticaland and ABSTRACTS 61 horizontal present-day crustal deformation re reflectflect the the ~300“300 km shortening in the Central Andes in Altiplano atat contribution of ofthree threemajor majorprocesses: processes:glacial—isostatic glacial-isostatic about~19-21°Sabout'”19-21°S contrasts with less than 100 km shortenshorten-- adjustment (GIA), plate tectonics and the opening of the inging at ~15°S“15°S and ~25°S.“25°S. This raisesraises the question ofof thethe Patagonian slab window. Furthermore, the observed site cause of change of the shortening magnitude. We hyhy-- displacements are affected byby thethe elasticelasticresponse responseofthe of the pothesize that the difference inin thethe strengthstrength ofof thethe up-up- solid earth to short-term loadIoad signals, e.g. hydrological per plate causes differences inin tectonictectonic stylesstyles resultingresulting loading,Ioading, ocean tidal Ioadingloading andand atmosphericatmospheric Ioading.loading. inin variable ratesrates of trench roll-back.roII-back. The parameters that Current regional models of GIA (Lange et al. 2014; Ivins weakened the continental plateplate andand controlledcontrolled thethe tec-tec- & James 2004) explain the observed uplift essentiallyessentiallyas as tonic styleste of the foreland deformation (thin-skin,(thin-skin, thick-thick- a superposition ofof thethe visco-elasticvisco-elasticresponse responseto toice-mass ice-mass skin) were investigated previously,previously, withoutwithout regardingregarding thethe changes since the Little IceIce AgeAge andand thethe elasticelasticresponse response subduction. ThisThis projectproject aimsaims toto buildbuild onon previousprevious workwork to ongoing fast ice retreat.retreat. Glacial-isostaticGIaciaI-isostatic relaxationrelaxationis is by using the Advanced Solver for Problems in Earth“sEarth”s unusually fast in Patagonia due to the peculiar tectonic- ConvecTion (ASPECT) to numerically simulate 2D and 3D rheologicalrheological settingcharacterized characterizedby bythe thesubduction subductionof of visco-plastic modelsmodels ofof thethe interactioninteractionof ofthe thesubducting subducting an active oceanicoceanic ridgeridge atat thethe ChileChile TripleTriple Junction,Junction,the the Nazca plate and overriding South America plate. First, opening of the Patagonian slab window and the upwellupwelI-- we will run high-resolution 2D2D East-WestEast-West crosscross sectionssections inging of low-viscositylow-viscosity mantle material underneath the iceice-- along the Altiplano andand PunaPuna Iatitudes.latitudes.Second, Second,we weplan plan fields.fields. to extend the previous cross-sections toto aa 3D3D modelmodel ofof Progress in our understanding of GIA in Patagonia dede-- the entire region.region. FinaIIy,Finally, wewe willwill updateupdate thethe 3D3D modelmodel ofof pends on the ability to separate the visco-elastic and and the lithosphericlithospheric structure in the Puna regionregion developed elastic contributionscontributionsto tothe theobserved observeduplift. uplift.A quantita-A quantita- by our partner project. This project is supported by the tive modellingmodelling ofof thethe elasticelasticresponse responseto toongoing ongoingsurface surface InternationalInternational ResearchResearch TrainingTraining GroupGroup StRATEGy.StRATEGy. mass changes requires two input models: an elastic earthearth 'nl'y!‘ fi'lüL‘lElHZ'M'Slütl '-'- ECI'r'I-"'g'r‚ "u'jJ'EMI2': EL‘i'r'I-‘yr, u = 0.05 TimE- : 35 M3 E model and a loadIoad model which describes the spatial massmass _ -- l'l"|n.'ln!-".l-!'|'| defnrmntmnnn distribution ofof thethe Ioad.load. GRACEGRACE sateIIitesatellite gravimetrygravimetry datadata have been recently used to estimate iceice massmass changeschanges ofof the Southern and Northern Patagonian IcefieldsIcefields overover 1515 years (Richter et al. 2019). These results serve as a basis for an improvedimproved loadIoad model for the calculation ofof elasticelastic glacial loadingIoading effects. Ü:5‘ld!'I-I'.Ell\'fl'|l EPÜÜ Here we present modelling results of the elastic rere- sponse to present-day ice mass changes in southern Patagonia. In addition, we we show showelastic elasticIoading loadingeffects effects Evidences of permafrost degradation in derived for selected hydrological loadingIoading scenarios in Evidences of permafrost degradation in the regionregion under investigation,investigation, including includingthe theimpacts impactsof of the arid Andes and its potential effecteffecton on the Perito MorenoIVIoreno glacier dam rupturerupture and the planned hydrological resources Rio Santa Cruz dams. These results are evaluated with J. P. MilanaMilanal,1, L.L. SchrottSchrottz,2, S. WohnlichWohnlich33 regardregard to the contribution ofof hydrologicalhydrological Ioadingloading onon thethe 11UniversidadUniversidad Nacional de San Juan, Instituto dede Geologia,Geologia, SanSan Juan,Juan, geodetic observables and their potential for validating or geodetic observables and their potential for validating or Argentina constraining the elastic earthearth model.model. 22UniversitätUniversität Bonn, Geographisches Institut, Bonn,Bonn, GermanyGermany 33Ruhr-UniversitätRuhr-Universität Bochum, Institut fürfür Geologie,Geologie, MineralogieMineralogie undund Geophysik, Bochum, Germany The nature of the North-South change of Buried ice forming different ice-bearingice-bearing permafrostpermafrost de-de- the magnitude of tectonic shortening in posits in arid mountains has been recognised for a long Central Andes at Altiplano-Puna Iatitudes:latitudes:a a time asas anan importantimportant waterwater resource.resource. However,However, thethe com-com- thermomechanical modeling approach. plexpIeX interactions between betweenprecipitation, precipitation,temperature, temperature, ground heat transfer and water phase changes within 1 2 2 P. MichaelMichaell,, S. SobolevSobolevz,, S. LiuLiu2 the ground isis not wellweII understood. Disconcertingly, thethe 11UniversitätUniversität Potsdam, Geodynamic Modeling, Potsdam, Germany two main variables for the existence of ice-richice-rich permaperma-- 22GFZGFZ Helmholtz-Zentrum Potsdam, Geodynamic Modeling, Potsdam, frost deposits are inin jeopardy: temperature isis risingrising inin Germany concert with the global warming tendency and regionregion-- WhileWhiIe an orogeny typically involves the collision of 2 concon-- alaI studies in the arid Andes indicate that precipitation tinental plates,plates, thethe AndeanAndean orogenyorogeny formedformed inin aa contextcontext dropped by half in the last century (Vuille and Milana,IVIiIana, of subduction, withwith thethe oceanicoceanic NazcaNazca PlatePlate sinkingsinking un-un- 2007). Therefore, this long-term climate tendency leavesIeaves der the continental SouthSouth AmericanAmerican Plate.Plate. WhereasWhereas thethe no doubts that ground-ice is suffering degradation,degradation,enen- subduction has hasbeen beenactive activesince since“180 IVIa, ~180the Ma,short- -the short dorsed by three studies: 1) detection of oftaliks taliksat atthe the ening of the Andes initiated atat “’50~50 IVIa.Ma. IVIoreover,Moreover, thethe permafrost of the Agua Negra pass (Schrott, 1996), 1996),2) 2) 62 ABSTRACTS incompleteincomplete refreezingrefreezinrg> of the active Iayerlayer duringduring winterwinter The hyperarid core of the Atacama Desert in northern near the same location (Croce (Croceand andIVIilana, Milana,2002), 2002),and and Chile is well known for its long-term climatic stability stability 3) indirect evidence of permafrost degradation fromfrom thethe (i.e.(i.e. long-termlong-term hyperaridity), limitinglimiting thethe formationformationand and common occurrence of permafrost-derived molards in maintenance of drainage systems in this area. However, landslidesIandslides amounting forfor ca.ca. 30%30% ofof thethe reportedreported molar-molar- the uplift ofof thethe CoastalCoastal CordilleraCordillera introducedintroduced potentialpotential ds worldwide (Milana,(IVIilana, 2016). Non-published examples energy promoting fluvialfluvialincision, incision,which whichhas hasled ledto tothe the found inin the arid Andes inin Chile would riserise that number formation of ofnumerous, numerous,isolated isolatedsmall-scale small-scaledrainage drainage to 50% suggesting thatthat Iandslideslandslides relatedrelated toto permafrostpermafrost systems in this area. On the northern rimrim of the E-W oriori-- degradation are areabnormally abnormallyhigh highin inthe thearid aridAndes, Andes,as as ented RíoRio Loa canyon (latitude 21.4°S),21.4°S), suchsuch incisionincision tooktook expected from the combined effect ofof temperaturetemperature riserise place into an alluvial surface of at least Miocene age. The and precipitation decrease.decrease. TheThe recentrecent efforteffortof ofArgenti- Argenti- uniform substrate and long-term stability of synoptic na and Chile to map their glaciers and other cryospheric conditions favorfavor thethe studystudy ofof thethe impactimpact ofof locallocal (micro-)(micro-) bodies, both due to new lawsIaws and a social pressure on climate and climate change, erosion, atmospheric depodepo-- governments, helps to understand the potential effect effect sition andand locallocal tectonicstectonics onon thethe formationformationof oftopography topography of losing part of the ground ice in the arid Andes. PrePre-- inin this area. For our multi-temporal analysis, analysis,we wemea- - mea liminaryliminary cryospheric inventoryinventory mapping indicatesindicates that sured concentrations ofof terrestrialterrestrial cosmogeniccosmogenic nuclidesnuclides for largelarge regionsregions as the Atacama (Chile)(Chile) with semiarid, (TCN;(TCN,- 10Be,108e, 26Al and 14C)14C) from channel pebbles and arid and hyperarid environments, the surface coverage inferredinferred time-integrated catchment-averaged catchment-averaged erosion erosion of buried ice is 95.3% of all ice-bodies while glaciers only ratesrates of catchments locatedlocated within a short (2.5 km) E-W account for 4.7%. Preliminary models of water producproduc-- transect, i.e.i.e. parallel to the RíoRio LoaLoa canyon. We combine tion howeverhowever suggestsuggest thatthat thesethese 95.3%95.3% (without(without consid-consid- TCN data with an analysis of catchment-averaged geogeo-- eringerinrg> seasonal snowmelt) may account for only 63% of morphic metrics and an unmanned aerial vehicle (UAV)- the total water supply (glaciers: 37%; GarcíaGarcia et al., 2015). based mapping ofofthe the distribution ofof gypsumgypsum crustcrust cover.cover. The more serious problem of the buried ice is that, while InIn summary, we findfind thatthat erosionerosion ratesrates increaseincrease byby oneone exposed ice tends to occur at high altitudes, wellwell aboveabove order of magnitude from East to West. A topographically the 0ºC09C mean annual temperature (MAAT),(IVIAAT), mapped burbur-- modest tectonic ridge separates a detachment-limited iedied iceice frequency peaks quite close to the position ofof thethe erosional regime in the west from a transport-limited MAAT, suggesting thatthatjust just aa minorminor increaseincrease ofof ambientambient regimeregime to its east. The ridge“sridge”s crest also marks the westwest-- temperature will leaveleave “unprotected””unprotected” largerlarger areas of ice- ern boundary of significantsignificant gypsumgypsum surfacesurface crustcrust cover.cover. bearing permafrost fostering its degradation andand creat-creat- However, the present-day gypcrete distribution indicatesindicates inging a significantsignificant impact impacton onfuture futurewater waterreserves. reserves.This This a polyphase (at least two-phase) incision of the drainage ice-buriedice—buried resource,resource, although considered “permanent”,”permanent”, networks. The differentialevolution evolutionof ofdrainage drainagein our in our isis actually activated duringduring thethe periodicperiodic droughtsdroughts inin yearsyears study area might have commenced near to the Pliocene/ almost without seasonal snow. Pleistocene boundary.

Deciphering a steep erosional gradient in Early evolution ofof thethe GulfGulf ofof Mexico:Mexico: SynriftSynrift the hyperarid core of the Atacama Desert, successions, climate, and tectonic setting northern Chile R. S. Molina-GarzaMolina-Garzal,1, J. PindellPindellz,2, T. F. LawtonLawton33 J. MohrenMohrenl,1, S. A. BinnieBinniel,1, B. RitterRitterl,1, D. A. LopezLopezl,1, T. J. Universidad Nacional AutónomaAuto’noma de México,Mexico, Mexico City, Mexico DunaiDunaP1 Rice University, United States, and Cardiff University,University, UKUK University of Texas at Austin, Austin,Austin,United UnitedStates States 11InstituteInstitute ofof GeologyGeology andand Mineralogy,Mineralogy, UniversityUniversity ofof Cologne,Cologne, Cologne,Cologne, Germany The Gulf of Mexico is a subsidiary basin to the Atlantic, resultingresulting fromfrom JurassicJurassic break-upbreak-up ofof Pangea.Pangea. TheThe rotation-rotation- The impact of endogenic and exogenic factors on the al hypothesis for its origin is now widely accepted, and formation ofof topographytopography isis difdifficultficult to toassess, assess,mainly mainlybe- be- itit isis supported by satellite-derived gravity, paleomagpaleomag-- cause (1) the processes shapingshapintg> the topography mostly netic, andand aeromagneticaeromagneticdata. data.Other Otherissues issuesare arefar farless less integrateintegrate over longlong time scalesscales andand (2)(2) duedue toto thethe spatialspatial understood, such as a full closure fit,fit, thethe riftingriftingprocess process heterogeneity of large-scale study areas, i.e. with respect and stratigraphy, andand thethe drivingdriving mechanism.mechanism. IVIoreMore im-im- to synoptic conditions conditionsor orlithology, lithology,amongst amongstothers. others. portantly, the paleogeographic evolution hashas importantimportant Thus, to enhance our understandingunderstandinrg> on how Earth-shapEarth-shap-- implicationsimplications forfor hydrocarbonhydrocarbon exploration.exploration.The TheIVIesozoic Mesozoic inging processes are linkedlinked and how they affect thethe forma-forma- stratigraphy ofof MexicoMexico recognizesrecognizes aa LateLate TriassicTriassic riftinrg>rifting tion ofof topography,topography, itit isis desirabledesirable thatthat asas manymany endogenicendogenic episode in the ElEI Alamar Formation andand thethe TodosTodos SantosSantos and/or exogenic factors as possible can be considered to Formation sensusensu ValleValle Nacional.Nacional. ThisThis episodeepisode maymay cor-cor- approach uniformity and/or to be constant on the long- respondrespond to a wide riftrift mode,mode, andand itit isis requiredrequired toto bringbring term perspective. Yucatan from its pre-drift positionpositionto toa aposition positionconsis- consis- ABSTRACTS 63 tent with Late Jurassic counterclockwise rotation.rotation. New New roundedrounded by arid landmasseslandmasses developed inin the circum- fieldfield andand provenanceprovenance datadata forfor thethe TodosTodos SantosSantos Forma-Forma- Gulf region. We propose that hydrocarbon source-rock tion recognizedrecognized anan UpperUpper TriassicTriassic fluvialfluvialsiliclastic siliclasticsucces- succes- deposition waswas facilitatedfacilitated byby aridarid conditions,conditions,fertilization fertilization sion in the western Veracruz basin. Here, Todos Santos is by continental silt,silt, andand wind-inducedwind-induced coastalcoastal upwelling.upwelling. intrudedintruded by a ~194“194 Ma pluton (U-Pb).(U-Pb). The early-rift Trias-Trias- sic succession was halted during a long episode (~196-(“196- 165 Ma)IVIa) of continental arcarc magmatism,magmatism,and anddid didnot notlead lead Regional depocenter geometry and to sea floorfloor spreading.spreading. AA keykey toto understandingunderstanding drivingdriving subsurface frontal structural features in mechanisms to open the Gulf is provided by the dynamdynam-- the foothills and western foreland Ilanos icsics of the Nazas trench, which recordsrecords an evolution fromfrom the foothills and western foreland llanos an Early-MiddleEarly-IVIiddle Jurassic extensional arc to mature rift Sub-Andean basin (Colombia) based on basins. gravimetric modeling Records of Jurassic continental arc arcvolcanism volcanismin ineast east P. N. Morales HernandezHernandezl,1, A. KammerKammerz,2, J. C. AlzateAlzate3,3, M. and southern Mexico include La Boca Formation, inin thethe GarcíaGarcia33 Sierra MadreIVIadre Oriental, and La Silla Formation north northof of 11UniversitätUniversität Bremen, Geowissenschaften, Bremen,Bremen, GermanyGermany the Chiapas massif. These units are correlated with the 22UniversidadUniversidad Nacional de Colombia, Geociencias, Bogota, Colombia Nazas Formation (Nazas(Nazas arc)arc) ofof centralcentral Mexico,Mexico, andand thethe 33EquionEquion Energia Limited, Bogota, Colombia units pertaining to the Jurassic Cordilleran arc of Sonora, as well as the Jurassic arc of the Central Cordillera of CoCo-- Regional scale studies play a key role in understanding lombia.lombia. The main riftrift successionsuccession associatedassociated withwith open-open- the tectonic evolution ofof sedimentarysedimentary basins.basins. AsAs partpart ofof inging of the Gulf of Mexico isis younger than about 170 them, gravimetric modeling constitutes an animportant important Ma,IVIa, based on young zircon ages at multiple locations.locations.In In tool to improveimprove geological knowledge, especially inin areas Chiapas, synrift depositsdeposits correspondcorrespond toto thethe TodosTodos San-San- with limited accessibility or frontier basins.basins. UsingUsing recent-recent- tos Formation sensu sensuConcordia; Concordia;here, here,coarse-grained, coarse-grained, lyly reprocessedreprocessed airborne gravity data, 3D tomographic pebbly, arkosic sandstones with thin siltstone intercalaintercala-- PSDM velocity field asas wellwell asas densitydensity wellwell data,data, anan inte-inte- tions andand thickthick conglomerateconglomerate packagespackages areare interpretedinterpreted grated density model was built. Regional to sub-regional as deposits of a high-gradient, axial rift, fluvialfluvialsystem systemfed fed changes in depocenters and subsurface frontal structural by transverse alluvial fans derived from the rift shoulder.shoulder. features from the foothills and western foreland llanosIlanos Sr-isotopes from the Louann and Campeche subsurface Sub-AndeanSub—Andean basin (Colombia) were mapped and modmod-- evaporites date earlier marine incursions into the Gulf to eled. about 167-169167—169 Ma.IVIa. The Bathonian-Callovian incursions were followed by a basin-wide Late Jurassic transgrestransgres-- sion that accompanied sea-floorsea-floor spreading.spreading. As Pangea ruptured, Jurassic northward migration ofof Mexico, which lay on the southern part of the North America plate, resulted in temporal evolution ofof climate-climate- sensitive depositionaldepositionalenvironments. environments.Prior Priorto toopening openingof of the Gulf, Lower-MiddleLower-IVIiddle Jurassic rocksrocks in central Mexico contain a record of warm-humid conditions; these theseare are indicatedindicated by coal, plant fossils and compositionally ma-mature sandstone. Paleomagnetic datadata forfor centralcentral OaxacaOaxaca and other regions of central and eastern Mexico indicate that these rocksrocks were deposited at near-equatorial papa-- leolatitudes.leolatitudes. InIn thethe LateLate Jurassic,Jurassic, asas thethe GulfGulf ofof MexicoMexico formed, eolianites and widespread evaporite deposits indicateindicate dry-arid conditions. Available Available paleomagnetic paleomagnetic The basal configurationconfiguration of ofthe thenorthern northernpart partof ofthe thestudy study data (compaction-corrected) forfor UpperUpper JurassicJurassic stratastrata inin area shows a deeper basement allowing more accomaccom-- central Mexico indicate deposition atat ”15-209N.~15-20ºN. modation spacespace forfor thethe youngeryounger sedimentarysedimentary sequencesequence As North America moved northward during Jurassic than the central and southern areas. Clear gravimetric opening of the Atlantic andand thethe Gulf,Gulf, differentdifferentlatitudinal latitudinal positive anomalies, anomalies,topographic topographicand andreflection reflectionseismic seismic regionsregions of the continent experiencedexperienced coevalcoeval IVIiddle-LateMiddle-Late data, suggest the existence of deeper frontal structural Jurassic climatic shiftsshiftsthat thathave havebeen beenwidely widelyrecognized recognized features, relevantrelevant as hydrocarbon-bearing traps and inin the Colorado Plateau inin the United States. Affected byby possible prospective C02CO2 storagestorage areas.areas. HigherHigher densitydensity the same northward drift asas thethe plateau,plateau, thethe southernsouthern rockrock units (slightly metamorphized-Paleozoic sequence end of the North America plate represented by central or crystalline-Precambrian basement) are inferred to be Mexico gradually reached the arid horse latitudes inin thethe includedincluded within the observed Pop-Up structures, which latelate MiddleIVIiddle Jurassic as the Colorado Plateau was leavleav-- formed as a resultresult of MesozoicIVIesozoic normal fault inversioninversion inging them. As a result,result, Late Jurassic epeiric platforms sur-sur- during the Andean orogeny. These features are also rere-- 64 ABSTRACTS flectingflecting a atectonic tectonicstyle stylechange changealong alonga SW-NE a trend, SW-NE trend, the environment, housing, the creation ofjobsof jobs andand earn-earn- with a transpressive component settingin inat at5.7° 5.7°N Nthat that ings,ings, health, education, culture cultureand andIeisure, leisure,and andmany many isis consistent with a regionalregional convergent and oblique tectec-- other issues that will demand time to to create, create,ponder, ponder, tonic setting.Presence, Presence,sizes, sizes,vertical verticaldisplacements displacementsand and and rebuild. gravimetric anomalies of these structures are possibly a function ofof thethe proximityproximity toto SierraSierra NevadaNevada deldel CocuyCocuy duedue to the amount of compressive stress.

Dam Collapse: the case of Brumadinho —– 2019 (Brumadinho, Minas Gerais —– Brazil) J. OliveiraOliveiral,1, P. W. OliveiraOliveira11 11UniversidadeUniversidade Federal Minas Gerais, Chemistry, Belo Horizonte, Brazil Fig.1Fig.1-- Before and afteratter disasterdisaster Brazil is known for its mining strong economic activity. InIn the 18th Century, the intenseintense mineral extraction re-resulted in the construction ofof roadsroads fromfrom thethe countrycountry toto Geologic recognition ofof thethe EoceneEocene LosLos CorrosCorros the coast, inin order to transport the production. IVIany Many smallsmaII towns were formed around these new sources of fossiliferous levelIevel (Esmeraldas formation, jobs and services, such as Brumadinho. There are many middle Magdalena valley, Colombia) mining areas with full infrastructure around this town. In L.L. J. OrdoñezOrdofiezl,1, G. D. Patarroyo CamargoCamargol'21,2 the midst of these activities,on onJanuary January25th, 25th,2019, 2019,the the 11UniversidadUniversidad Industrial de Santander, Bucaramanga, Colombia Corrego do Feijao tailings dam collapsecoIIapse occurred, leavingIeaving 22StratosStratos ConsultoríaConsultoria Geológica,Geolögica, Bucaramanga, Colombia 238 people dead. Three years ago, there was the worst environmental The Middle Magdalena Valley is one of the most prolificprolific disaster in Mariana,IVIariana, Minas Gerais State, when the MinaIVIina basins in Colombia in terms of historic production ofof hy-hy- do FundãoFundäo tailings dam collapsed,coIIapsed, in November 2015, rere-- drocarbons. The Cenozoic segment in the basin is reprerepre-- leasingleasing 62 million cubic meters of mud. sented by units that bear the main reservoirreservoir rocks,rocks, therethere-- The Corrego do Feijao tailings dam 1 was created in fore the importanceimportance of definingdefining itsits stratigraphicstratigraphiccontext. context. 1976 to contain finefine tailings tailings resulting resultingfrom fromthe themining mining InIn the past, at leastleast three fossiliferous levels,leveIs, consisting treatment installation,installation, reusingreusing thethe waterwater inin thethe industrialindustrial of mollusks, have been recognized in this area and all of process. 40% of solid composite rejects and 60% water them have been used as correlation eventsevents oror elementselements are directed to the tailings dam. The tailings dam in a to definedefine stratigraphic stratigraphicboundaries. boundaries.In Ina lesser a lesserdegree, degree, shape of slope is a technology developed by the soil meme-- these levelsIevels have been also used to definedefine paleoenviron-paleoenviron- chanic engineering a longIong time ago,ago, asas aa cheapercheaper alterna-alterna- ments. Nowadays, none of the outcropping fossiliferous tive dam,dam, constructedconstructed withwith soiI.soil. TheThe problemproblem isis thethe pres-pres- levelsIevels have a detailed sedimentological and paleontologpaleontolog-- ence of water. If it is not eliminated, it can be leadIead to a icalical characterization. liquefaction.quefaction. InIn order to deepen on these topics, the type localitylocality Today, the processed iron ore results in a concentrate of one of the most reported fossiliferous horizons was of about 50%; leavingIeaving about 50% of tailings. In Minas revisited.revisited. A taphonomic survey of the Eocene LosLos Corros Gerais, the production isis 350350 millionmillion tons/year.tons/year. levelIevel (upper(upper section ofof EsmeraldasEsmeraldas Formation)Formation)illustrates illustrates The scientificscientific community communityand andthe theUniversidade UniversidadeFeder- Feder- that far from corresponding a discrete interval, with al de Minas Gerais have been debating aboutabout thisthis themetheme well-definedwell-defined thickness,thickness, itit actuallyactually comprisescomprises aa heteroge-heteroge- of tailings dam disasters in lectures,Iectures, workshops, and varivari-- neous lithostratigraphic segment,segment, wherewhere thethe abundance,abundance, ous meetings. TheseThese eventsevents includeinclude actionsactionsin inorder orderto to preservation, andand distributiondistributionof ofthe theidenti identifiedfied mollusks mollusks enable a better understandingunderstanding aboutabout thethe disaster,disaster, result-result- (bivalves(bivalves and gastropods), suggest a high complexity inin inging inin thoughts about preventive measures.measures. the sedimentation environment. environment. For Forthis thisreason, reason,our our The absence of consistent studies related to continucontinu-- resultsresults strengthen the ideaidea that a detailed sedimentosedimento-- ous surveying and inspection ofof thesethese damsdams signisignificantlyficantly logicallogical and paleontological study of this horizon, would contribute to a repeated scenario of tailings dam collapscoIIaps-- improveimprove the knowledge about the paleoecology of the es. In addition, thethe evaluationevaluationof ofscienti scientificfic and andtechno- techno- Esmeraldas Formation. logicalIogical resourcesresources available but not used isis also importantimportant for the proposal of public policies. The general goal is to establish a process that is comcom-- mitted toto Iifelife andand rightsrights oftheof the populationpopulationharmed, harmed,which which will demand a long-termIong-term intense work to point problems and propose actions onon variousvarious issues.issues. IssuesIssues relatedrelated toto ABSTRACTS 65

Presence of critical metalsmetals (Sc(Sc andand REE)REE) of origin, geological evolution and andpaleoenvironmental paleoenvironmental inin lateritesIaterites from ophiolitic Moa-BaracoaMoa-Baracoa and paleoclimatic fluctuationsfluctuationsdurinig> duringthe thelast lastca. ca.500 500ka. ka. The lowerIower 100 m are composed by lavaIava flowsflows andand interca-interca- complex, Cuba. An investiment opportunityopportunity latedIated pyroclastic materials.materials. SevenSeven unitsunits werewere recognized.recognized. for EU? The lavasIavas are basaltic t0to basalticbasalticandesitc andesitcand andthe theHarker Harker G. OrozcoOrozcol,1, A. CarballoCarballol,1, J. N. MuñozIVIu'rioz11 diagrams point tot0 fractionated crystallizationcrystallizationand andpartial partial 11MoaMoa University, Cuba fusion as main processes. The ratioratio 143Nd/144Nd143Nd/144Nd indi-indicate a mantle depleted source; however, the 86Sr/87Sr, Current scientificscientific Iiterature literaturereports reportsthe thepresence presenceof of 207Pb/ 204Pb y 206Pb/204Pb ratios suggest suggesta acortical cortical scandium in lateriticIateritic deposits depositsin inAustralia, Australia,the thePhilip- Philip- component. The age of the lavasIavas remains unknown, but pines, New Zealand and other countries. According tot0 itit isis considered an age of ca. 500 ka. U.S. Geological Survey (2018) identifiedidentified resources resourcesof of On top of the lavaIava flows,flows, depthdepth alluvialalluvial fan,fan, debrisdebris flowflow scandium are reported in Australia, Canada, China, KaKa-- and hyperconcentrated flowflow depositsdeposits werewere accumulated.accumulated. zakhstan, Madagascar, Norway, the Philippines, Russia, At depths 296-280 m, a transition fromfrom alluvialalluvial toto fluvialfluvial Ukraine and the United States of America. Due tot0 its lowIow environment is characterized by turbulent flowflow depositsdeposits concentration, scandiumscandium isis producedproduced almostalmost exclusivelyexclusively associated tot0 a deltaic-fluvialdeltaic-fluvial setting, setting,alternating> alternatingwith with as a by-product of the processingprocessintg> of various minerals or floodplainsfloodplains Iaminar laminarflow flowdeposits. deposits.The Thefirst firstIacustrine lacustrine previously recovered from industrial tailings and waste. sedimentation occurs occursat at277 277m depth, m depth,in a transition in a transition InIn China, itit isis obtained as a byproduct of the production between fluvialfluvial andand Iacustrinelacustrine environmentenvironment thatthat repre-repre- of titanium andand rarerare earths;earths; inin Russia,Russia, fromfrom apatiteapatiteand and sents a former body of water named „Paleo-Chalco I“.I”. inin Kazakhstan and Ukraine, from uranium. The main uses Above 267 m depth the definitivedefinitive establishment establishmentof ofthe the of scandium are related to aluminum-scandium alloysaIos lake,Iake, „Paleo-Chalco„PaIeo—Chalco II“,II”, isis recognized.recognized. This isis charactercharacter-- and manufacture of solid oxide fuel cells (SOFCs). Other izedized by eutrophic and deep waters. ItsIts origin isis probably importantimportant uses are reportedreported inin ceramics, electronics, laIa-- associated tot0 tectonism and volcanism, as it is preceded sers, lightingIightinrg> andand radioactiveradioactiveisotopes. isotopes. by debris flowflow depositsdeposits andand aa 8585 cmcm thickthick whitewhite pumicepumice InIn Cuba, inin recentrecent years, the existence of scandium deposit. The age of the „Paleo-Chalco„PaIeo—Chalco I“I” is ca. 475 ka. has been established in lateriticIateritic nickelnickel andand cobaltcobalt oresores inin the MoaIVIoa region,region, usingusintg> ICP-MSICP—IVIS analysis. InIn this work an analysis of the geological and economic meaning of the contents of scandium and REE reported in the ores of CaCa-- marioca East, Yagrumaje North and Yagrumaje South dede-- posits and others of this region is carried out. The distridistri-- bution ofof scandiumscandium mineralizationmineralizationin inthe theIateritic lateriticpro profilefile predominates in the limoniticIimonitic horizon,horizon, wherewhere goethite,goethite, gibbsite and hematite appear. appear.It Itis isconcluded concludedthat thatthe the values of the Sc average contents reported show ecoeco-- nomic potential forfor thethe developmentdevelopment ofof geologicalgeological explo-explo- rationration projectsprojects thatthat considerconsider thethe extractionextractionof ofscandium scandium and REE as a byproduct of nickel and cobalt production inin the MoaIVIoa region,region, using the high-pressure acid leachingIeaching technology (HPAL).(HPAL).

Lacustrine sediments are interbedded with numerous Basin evolution, Iakelake establishmentestablishment andand volcanic deposits and show a complex stratigraphy, in in orbital scale climatic variability:variability: thethe ca.ca. 500500 which deposits of diatom oozes, ostracod hashes, carcar-- ka sedimentary record of Lake Chalco, central bonate facies, and massive tot0 laminatedIaminated structures ococ-- cur. The record of past climatic andand environmentalenvironmental condi-condi- Mexico. tions ofof thethe Iacustrinelacustrine sedimentarysedimentary sequencesequence isis currentlycurrently B. OrtegaOrtegal,1, R. MartínezMartinezl,1, L. RomeroRomerol,1, D.D.Avendar"101, Avendaño1, S. under investigation, by byusing usinga amultiproxy multiproxyapproach approachthat that LozanoLozanol,1, M. CaballeroCaballerol,1, E. BrownBrownl,1, B. ValeroValerol,1, M. StockStock-- includesincludes –among—among others- elementaleIementaI geochemistry, diadia-- heckeheckel,1, P. FawcettFawcettl,1, J. WerneWernel,1, L. PérezPerezl,1, A. SchwalbSchwalb11 tom, charcoal and pollenpoIIen analysis and rockrock magnetism 11UniversidadUniversidad Nacional Autonioma de Mexico, Instituto dede GeoGeofisica,ﬁsica, parameters. Current and published work on the upper Ciudad de Mexico, Mexico 120 m, which span the last ca. 150 ka, reveal orbital scale variability recorded in the Lake Chalco sediments. Drier The MexiDrillIVIexiDriII ICDP coring project recovered a ca. 520 m conditions, Iower lowerIake lakestands standsand andhigher higherfrequency frequencyof of longIong sedimentary sequence inin the depocentre of Lake fireﬁre eventsevents areare recordedrecorded during>during springspring andand summersummer in-in- Chalco in central Mexico, which constitutes a aunique unique solation. AtAt thethe endend ofof thethe IVIarineMarine IsotopicIsotopic StageStage 66 (IVIIS(MIS continuous Iacustrinelacustrine sequencesequence thatthat containcontain thethe historyhistory 66 ABSTRACTS

6), Chalco was a relatively deepdeep andand stratistratifiedfied freshwa- freshwa- References ter lake.Iake. During MIS 5 fluctuatedfluctuated betweenbetween Iowlow Iakelake Iev-lev- Parica, C. A., Dapeña,Dapena, C., Remesal, M.B. y Salani, F.M. 2012. CaracterCaracter—- els and marsh and littoralIittoral settingssettingswith withdry dryperiods. periods.Low Low izaciónizacion químicaquimica e isotó-picaisoto’-pica del agua en el sector norte de lala Meseta de SomúnSomun Curá.Cura. RíoRio Negro. ICES 8. Resúmenes,Resümenes, Mar del Plata.PIata. CD. lakeIake levelsIevels persisted during the MIS 4 and MIS 3. The lastlast 2pp. Glacial Maximum (24.5-19.5 ka) was characterized by Parica, C. A., Dapeña,Dapena, C., Remesal, M.B. y Bellino, L. 2017. UnderstandUnderstand-- lowIow lakeIake levels,Ievels, and an increaseincrease inin precipitation duringduring inging the hydrological system inin the SomúnSomun Cura Plateau, RíoRio Negro the deglacial. The early Holocene isis marked by a sharp and Chubut provinces. Argentina. LAKLAK 2017.2017. ActaActa 22 pp.pp. Heidelberg,Heidelberg, Deutschland. change to dry environments, that shift towardstowards moremore hu-hu- Remesal, M.; Bellino, L., Dapeña,Dapefia, C., Parica, C., 2016. Avances en el mid after ca.ca. 6.56.5 ka.ka. conocimiento de la dinámica,dinamica, el quimismo e isótoposisotopos del agua en lala meseta de SomúnSomun Curá.Cura. IXIX Congreso Argentino dede Hidrogeologia,Hidrogeología, Libro Calidad Agua SubterráneaSubterranea Trab 8: 69-76. ISBN: 978-987-661-978-987—661— 222-7.222—7. Water chemistry in SomúnSomün Cura region, Rio Negro and Chubut Provinces, Argentina. C. ParicaParical,1, M. RemesalRemesal22 The present is the key to the past: an 11UniversityUniversity of San Martin, InstituteInstitutefor forResearch Researchand andEnvironmental Environmental actualistic studystudy onon thethe foraminiferalforaminiferal Engineering, San Martín,Martin, ArgentinaArgentina assemblages of Albuquerque Cay (Colombian 22UniversityUniversity of Buenos Aires, Geology, Buenos Aires, Argentina assemblages of Albuquerque Cay (Colombian Caribbean) The SomúnSomun CuráCura Magmatic ProvinceProvince itit isis conformedconformed byby G. D. Patarroyo CamargoCamargol,1, D. F. GómezGomez GonzálezGonzalez22 volcanic and subvolcanic rocks and extends for 25.000 11UniversidadUniversidad Industrial de Santander, Escuela de Geología,Geologia, BucaraBucara-- km2 at South centre of RíoRio Negro Province and North manga, Colombia centre of Chubut Province in Argentine Patagonia.Patagonia. TheThe 22StratosStratos ConsultoríaConsultoria Geológica,Geolögica, Bucaramanga, Colombia entire regionregion underunder studystudy belongsbelongs toto aa desertdesert regimeregime un-under extreme temperatures, -25°C in wintertime toto 45°C45°C InIn the Colombian Caribbean, the sedimentary successucces-- inin Summer time, withwith averagesaverages betweenbetween 3°C3°C toto 35°C35°C withwith sions and their associated fossils present similarities very dry conditions. TheThe rainyrainy seasonseason isis springtimespringtimewith with with their equivalents in the recent marine settings.For For 50 mm to 225 mm/year. The evaporation/transpiration instance,instance, the Miocene carbonate platforms ofof thethe Sinu-Sinú- isis higher than rainsrains during allaII the year. IsotopicallyIsotopically the San Jacinto fold belt resemble the recent carbonate platplat-- water can be divided in four different groups, groups,one onefor for forms, includingincluding remotesremotes areas such as the San Andres the north, one for the south with an Atlantic originorigin ofof Archipelago (Western Colombian Caribbean). precipitations andand twotwo smaIlsmall groupsgroups withwith aa locallocal signa-signature (Parica et al. 2012; Parica et al.aI. 2017; Remesal et al. 2017).2017i IfIf the rainsrains are present inin the system the main source of water are locatedIocated in the high regions (Alta Sierra de SomúnSomun Curá,Cura, Apas, Talagapa, Sierra Negra de Telsen, etc) after snow snowmelting, melting,water watertransit transitoccurs occursthrough throughthe the structures in the Plateau rocks forming. Some salinizasaliniza-- tion maymay occuroccur duringduring thisthis transittransit andand increasingincreasing ofof tem-temperatures too from upperupperto to lowerIower levels.Ievels. Surface water is driven through streams, the most important are Valcheta (Rio(Rio Negro Province) and Telsen (Chubut(Chubut Province). IntoInto the basaltic plateauplateau waterwater circulationcirculationhas hasplace placethrough through the structures, from the upper levelsIevels by snow melting toto lowerIower levels,Ievels, where the water get salts and temperatures (23°(23° C for southern water outlets and 45°C for northern Our research tested such similarity on the benthic fofo-- water outlets). raminiferalraminiferal assemblages. A detailed sampling on recentrecent Water chemistry have a narrow spread, the chemistry sediments was effectuated inin oneone oftheof the insularinsular bodiesbodies ofof of water letIet to classifycIassify them into Calcium Chloride, CalCal-- the San Andres Archipelago. Due its isolatedisolated locationlocation onon cium Sulphate and Calcium Bicarbonate, with lightIight salinisalini-- the archipelago and tentatively itsits Iowlow stressstress byby humanhuman zation index,index, weakweak mineralization.mineralization.No NoAs Aswas wasdetected detectedat at activities,Albuquerque AlbuquerqueCay Cayis isan anexcellent excellentplace placeto tomake make the localitiesIocalities sampled,sampled, withwith pHpH betweenbetween 7.47.4 toto 8.48.4 thesethese those actualistic analysis.analysis. OnOn thethe otherother hand,hand, sub-recentsub-recent are mainly drinkable waters considering chemistry feafea-- (hardground(hardground levels)Ievels) and middle Miocene samples were tures and lowIow salinization risksrisks inin soiIssoils (SAR(SAR index).index). collectedcoIlected in both the same cay and the neighboring San Sponsored by UBACYT 20020170100554BA Andres Island. As expected, the foraminiferal assemblages in AlbuAlbu-- querque are abundant and diverse, where the symbiont- ABSTRACTS 67 bearing genera (Archais, Amphistegina among others), and its potential toto resolveresolve moremore subtlesubtle varaitionsvaraitionsin inB B the porcelanaceous and hyaline forms are dominant. isotopeisotope recordsrecords of lowIow BB samples. The newly obtained Moreover,IVIoreover, the proportion and anddistribution distributionof some of someof of MC-ICP-MSIVIC-ICP-IVIS data is compared with SIMS analyses of the the identifiedidentified forms formsmight mightbe controlled be controlledby physico- by physico- volcanic glasses and meltmeIt inclusions in olivines from the chemical factors such as the light incidence and the asas-- same samples. The BB isotopes of the bulk rock maficmafic sociated substrata. On the other hand, the hardgrounds scoria samples from Chile were analyzed via MC-ICP-MSIVIC-ICP-MS and the middle Miocene samples presented similar fofo-- and mimic the geochemical range derived from basaltic raminiferalraminiferal assemblages, though in a lowerIower preservation to andesitic/daciticscorias scorias(öllßvalues (δ11Bvaluesranging rangingfrom from due transport and moderated dissolution processes. processes. -8.59±0.23-8.59i0.23 to 3.98±0.08).3.98i0.08). These values are consistenly Notwithstanding, the middle Miocene samples of San higher than subducted sedimentsand altered crust at Andres are enough resolutive to to corroborate corroborate previous previous depth, necessitating a aheavy heavyB isotope B isotopeinput, input,perhaps perhaps paleoenvironmental interpretations inin thethe island.island. There-There- from subducted forearc modifiedmodified melanges.melanges. fore, future paleoenvironmental studies inin the Cenozoic of the San Andres Archipelago and the Colombian CaribCarib-- bean could be favored with detailed foraminiferal studstud-- Uranium zonation rerefinedfined U-Pb U-Pb iesies inin the recentrecent settings. thermochronology —– application toto thethe Northern Andes of South America Advances in B isotope analysis of silicate A. PaulPaul“,1,2, R. A. SpikingsSpikingsz,2, D. ChewChew3,3, S. J. DalyDaly3'43,4 rocks –— applications inin arcarc settingssettings(Chile) (Chile) 11UniversityUniversity of Edinburgh, School of Geoscience, Edinburgh, United Kingdom A. PaulPaul“,1,2, L.L. A. KirsteinKirsteinl,1, I.I. SavovSavov3,3, C. J. de HoogHoogl,1, T. ElEl-- 22UniversityUniversity of Geneva, Department of earth and Environmental SciSci—- ences, Geneva, Switzerland liottIiottz,2, S. J. TurnerTurner4,4, S. AgostiniAgostini55 33TrinityTrinity College Dublin, Dublin, Ireland 1 1UniversityUniversity of Edinburgh, School of Geoscience, Edinburgh, United 44UniversityUniversity College Dublin, Dublin, Ireland Kingdom 2 2UniversityUniversity of Bristol, School of Earth Sciences, Bristol, United KingKing-- Uranium-Pb high-temperature thermochronometers dom 33UniversityUniversity of Leeds, School fo Earth and Environment, Leeds, United (>350°C)(>350°C) exploit thermally activated volume volume diffusive diffusive Kingdom lossIoss of daughter isotopesisotopes inin accessory minerals such as 44WashingtonWashington University in St. Louis, Department of Earth and PlanPlan-- apatite, titanitetitaniteand andrutile. rutile.Previous Previousstudies studieshave haveshown shown etary Sciences, St. Louis, United States that U-Pb data can be used to generate accurate concon-- 55ConsiglioConsiglio Nazionale delle Ricerche, Instituto didi GeoscienzeGeoscienze ee Geori-Geori- sorse, Pisa, ItalyItaly tinuous t-T t-T solutions solutionsspanning spanninghundreds hundredsof millions of millionsof of years. Single grain ID-TIMSID-TIIVIS analysis yields the highest The composition ofof Earth”sEarth“s crustcrust isis modimodifiedfied from fromprimi- primi- precision, but detailed analyses of 238U/206Pb date vs tive mantlemantle byby processesprocesses suchsuch asas fractionationfractionationand andfluid fluid diffusion Iengthlength scalesscales revealreveal scatterscatterbeyond beyondpredictions predictions mobilisation, which whichcan canbe betraced tracedby fluid by fluidmobile mobileele-- ele from volume diffusion. TheThe causescauses ofof thisthis scatterscattercan canbe be ments and stable isotopes. Boron is a particularly use-use- numerous, and include i) metamorphic overgrowths, ii) fulfuI indicatorindicator for fluidfluid mobility mobilityand andlow-temperature low-temperature fluidfluid catalysedcatalysed Pb-removal,Pb-removal, iii)iii) parentparent isotopeisotope zonation,zonation, fractionation.Kineticly Kineticlycontrolled controlledfractionation fractionationof 118 of11B iv)iv) metamictization,and andv) v)changes changesin indiffusion diffusionIength. length. and 10B108 can be related to fractional crystalisationcrystalisationor orthe the We compare single grain ID-TIMSID-TIIVIS with LA-MC-ICP-MSLA-IVIC-ICP-IVIS in- growth of secondary minerals. However, the analysis of situ U-Pb dates, combined with trace element data (from B isotopes in samples with lowIow concentrations (<3(<3 ppm)ppm) Triassic leucosomes from the Northern Andes of South of B is technically challenging, owing to the high volatilvolatil-- America), to examine the influenceinfluence ofof parentparent isotopeisotope zo-zo- ityity of B during chemical processing and usually high BB nation onon t-Tt-T informationinformationderived derivedfrom fromapatite. apatite.Time-T— Time-T- blanks even in class 100 labs.Iabs. We present a re-evaluare-evalua-- solutions fromfrom thethe in-situin-situ analysesanalyses areare correctedcorrected forfor par-par- tion ofof BB separationseparationprotocols, protocols,involving involvingthe thewidely widelyused used ent zonation andand comparedcompared withwith i)i) apatiteapatite238U/206Pb 238U/206Pb high temeprature, K2CO3 fluxflux fusionsfusions andand thethe Iow-tem-low-tem- ID-TIMSID-TIMS data, and ii)ii) 40Ar/39Ar data obtained from perature, acid (HF) digestions. WeWe reportreport BB isotopeisotope ra-ra- muscovite and biotite from fromthe thesame samehand-specimen. hand-specimen. tios inin JBZJB2 andand IAEA—BSIAEA-B5 standardsstandards obtainedobtained byby differentdifferent IndependentlyIndependently obtained t-T informationinformation fromfrom thethe well-well- laboratorieslaboratories and chemical separation techniques,techniques, whichwhich established regional geologic history, and P-T estimates reducesreduces the discrepancies of reportedreported δ11B6118 data from from garnet-plagioclase-quartz-muscovite/biotite asas- TIMS,TIIVIS, ICP-MS, SIMS and MC-ICP-MSIVIC-ICP-IVIS documented in the semblages are used to constrain maximum post-crystallipost-crystalli-- 2000“s2000”s (Gonfianti(Gonfianti et etal., al.,2002) 2002)and andeven evenrecent recentstudies studies zation pressurespressures andand temperatures.temperatures. (e.g.(e.g. LiLi et al., 2019). We will also present B isotopeisotope ratiosratios obtained from MORB glassand scoria from the Chilean Andes obtained using Multi-Collecotor-Inductively-CouMulti-Collecotor-Inductive-Cou-- pled-Plasma-Mass-Spectrometrypled-Plasma-IVIass-Spectrometry (MC-ICP-MS),(IVIC-ICP-IVIS), demondemon-- strating thethe signisignificantficant improvement improvementin inB Bisotope isotopeanalysis analysis 68 ABSTRACTS

Tracking changes in weathering influxinﬂux intointo lateIate Ediacaran marine systems using lithiumIithium Tamengo Fm. - Gorumbä Group. Brazil isotopesisotopes inin carbonate rocks:rocks: An example from the CorumbáCorumbä Group, Brazil

G. Paula-SantosPauIa-Santosl,1, S. KasemannKasemannz,2, A. MeixnerMeixnerz,2, S. CaetaCaeta-- 542 i3 Ma no-Filhono-Filho3‚3, R. TrindadeTrindade3‚3, K. AmorimAmorim4,4, J. EnzweilerEnzweiler11 11UniversityUniversity of Campinas, Campinas, Brazil 22UniversityUniversity of Bremen, MARUM, Bremen, Germany 33UniversityUniversity of SãoSäo Paulo, SãoSäo Paulo, Brazil 44FederalFederal University of MatoIVIato Grosso, Cuiabá,Cuiaba, Brazil

Biological innovations andand thethe appearanceappearance ofof ﬁrstfirstcom- complex organisms are remarkable episodes of the terminal Ediacaran. Several changes in Earth System were hypothhypoth-- esized as possible causes for such life movement to its complex forms, but they remain to be properly underunder-- stood. Here we investigate thethe relationshiprelationshipbetween betweennu- nu- trient and alkalinity input intointo marine systems via chemichemi-- cal weathering and diversificationdiversiﬁcation of ofEdiacaran Ediacaranbiota. biota.To To track changes in continental weathering,weathering, thethe LiLi isotopeisotope composition (67Li)(δ7Li) ofof aa marinemarine carbonatecarbonate sectionsectionfrom from the latelate Ediacaran Tamengo Formation (Corumba(Corumbá Group,Group, Brazil) was analysed using a SF-ICP-MSSF-ICP-IVIS at the GeosciGeosci--

ences Institute of ofUniversity Universityof ofCampinas, Campinas,Brazil. Brazil.The The Lithnlugy Stnmtures um “lag? nefifimg l- _u. studied section isis aboutabout 5050 mm thickthick andand composedcomposed ofof twotwo ___"—I‘- l meannn| r plaF-ar-pa'allcl . ‚.uHJ'CIJHIH„um-.- E] alltsmne l.-_1rrur|.'_|1|r‚'.r| V CI'II'.‘-!.'i'.||flr] I'uEHaflü' "'""""”i"'" shallowing-upward cycles, alternating carbonate carbonate rocks rocks l’1:..r"I"I'1CICIlI.y - vom m: ash Iayer 51?;- crüss-stratilnmhün ä G.:-.rum‚t-cu.:| HIEI'I'III‘H and shales deposited in sub-coastalsub—coastal and mid to outer rampramp environments. Several occurrences of the latelate Ediacaran index fossils Cloudina lucinoiIucinoi and Corumbella A higher influxinflux ofof cationscationsis isthen thendelivered deliveredto tothe themarine marine werneri are recorded in these rocks. A volcanic rock layerIayer system, driving an increase in nutrient availability and at the top of the section waswas dateddated atat 542542 i± 33 IVIaMa (U-Pb(U-Pb overall alkalinity of the seawater, perhaps favouring biobio-- dating inin zirconzircon grains;grains; ParryParry etet al.al. 2017).2017). TheThe obtainedobtained logicallogical secretion ofof aragonite.aragonite. OtherOther WestWest GondwanaGondwana ba-ba- δ7Li67Li (IRMM)(IRIVIIVI) values vary between +12.5 and +3.5‰,+3.5%o, sins also display evidence of enhanced seawater alkalinalkalin-- definingdefining twotwo upward-decreasingupward-decreasing trendstrends thatthat matchmatch thethe ityity recordedrecorded on carbonate rockrock levelslevels bearing Cloudina shallowing-upward cycles. Samples from the base of sp., reinforcingreinforcing that high cationic in influxflux into intoocean oceanvia via the firstfirst cyclecycle yieldedyielded 67Liδ7Li valuesvalues starting>startingfrom from+12.5%o +12.5‰ chemical weatheringweatherintg> may have triggered biomineralizabiomineraliza-- inin rocksrocks deposited below fair weather wave base levellevel tion atat thethe Ediacaran-CambrianEdiacaran-Cambrian boundary.boundary. and decreasing to +4.5‰+4.5%o in shallow environments. SimiSimi-- larly,larly, values inin the upper cycle decrease from +11.5‰+11.5%o to References +3.5‰+3.5%o also from deep water to shallow water deposits. Perry et al.,al.‚ 2017. Nature Ecology & Evolution (1):(1): 1455-1464.1455-1464. Our data suggest two shifts fromfrom incongruentincongruent toto moremore congruent chemical weathering on continents, which which may be related to mountain range upliftingupliftintg> andand partialpartial Geothermal systems exploration inin confinementconfinement ofof marinemarine basinsbasins inin (shallower)(shallower) continentalcontinental the southern Chilean volcanic zone by settingsduring duringfinal finalstages stagesof ofWest WestGondwana Gondwanaassembly assembly magnetotelluric method (ca.(ca. 550-530 Ma).IVIa). Such changes inin weatheringweatherinrg> style coincoin-- magnetotelluric method cide with the occurrence of the firstfirst biomineralizingbiomineralizing or-or- M. PavezPave21‚1, E. SchillSchill2'3,2,3, S. HeldHeld4,4, D. DíazDI’az AlvaradoAlvarado5,5, T. KohlKohl44 ganisms of the Ediacaran fauna, suggesting anan interplayinterplay 11KarlsruheKarlsruhe Institute ofof Technology,Technology, Eggenstein-Leopoldshafen,Eggenstein-Leopoldshafen, Ger-Ger- between weathering influxesinfluxes andand lifelife diversidiversification.fication. Up-- Up many 2 liftinglifting wouldwould resultresult inin higherhigher denudationdenudationrates ratesand andthus thus 2TechnicalTechnical University of Darmstadt, Institute ofof AppliedApplied Geosciences,Geosciences, Darmstadt, Germany lessless 6Li and cation retentionretentionby byclay clayformation formationon onconti- conti- 33KarlsruheKarlsruhe Institute ofof Technology,Technology, InstituteInstitutefor forNuclear NuclearWaste WasteDis- Dis- nents (congruent weathering). posal, Eggenstein-Leopoldshafen,Eggenstein—Leopoldshafen, Germany 44KarlsruheKarlsruhe Institute ofof Technology,Technology, InstituteInstituteof ofApplied AppliedGeosciences, Geosciences, Karlsruhe, Germany 55UniversidadUniversidad de Chile, Departamento de Geofísica,Geofi’sica, Santiago,Santiago,Chile Chile

Understanding the subsurface behavior of the Earth is of high importance for the development of geothermal ABSTRACTS 69 energy, especially in Chile, which has active volcanoes volcanoes of the anomalies was split in correspondence with this throughout the country. An area with great potential ofof naturalnaturaI separation. InIn thethe northernnorthern zone,zone, threethree remark-remark- geothermal development is the southern zone of Chile. ableabIe positive Iineationslineationsare arepossibly possiblyindicative indicativeof ofintense intense Controlled by volcanic environment widely influencedinfluenced byby magmatic activityactivityat atthe theopening openingof ofthe thevolcanic volcanicpassive passive cortical faultfault systems.systems. SeveralSeveral thermalthermal springspring manifesta-manifesta- margin. One of these lineationsIineations isis relatedrelated toto anomalyanomaly GG tions ofof differentdifferenttemperature temperatureare areproof proofof ofthis thiscontrol. control. (Rabinowitz(Rabinowitz y Labreque, 1979) and the others two lineaIinea-- The study of geothermal systems in southern Chile bebe-- tions are areon onthe thesheIf shelfedge edgeand on andthe onplatform, the platform,both both gan aroud of Villarrica volcano, thanks to the cooperacoopera-- of them bend somewhat towards the coast becoming tion projectproject fundedfunded byby thethe IVIinistryMinistry ofof EducationEducationand andSci- Sci- highly intense at the south of the Colorado basin. This ence of Germany (BMBF)(BIVIBF) and the government of Chile, high-intensity pattern has hasbeen beencalled called„Tona „Tonaanomaly” anomaly“ with the objective ofof exploringexploring reservoirsreservoirs forfor thethe produc-produc- that isis abruptly interrupted at the Colorado discontinudiscontinu-- tion ofof energy.energy. TheThe studystudy inin thethe areaarea aroundaround thethe volcanicvolcanic ity.ity. Later Ghidella et al., made a 2D magnetic modellingmodelling volcano was based on 31 magnetotelurica (MT) stations, over a profileprofile andand thethe WernerWerner deconvolution.deconvolution.Afterwards Afterwards deployed in two profiles, oneone orientedoriented EWEW andand perpen-perpen- they analyzed a 3D modelling (Abraham, 2005) obtaining dicular to the branches of the Liquiñe-OfquiLiquihe-qui fault system as a conclusion that Tona anomaly has deep roots (~20(“20 (LOFS)(LOFS) and a second NS-oriented along LOFSLOFS and subsyssubsys-- km) and the top of the bodies are located to ~6”6 km in tems perpendicular to the Andean transversal fault (ATF) depth, with a slope of 1.5º1.59 SW, which to the depth of 8 and the chain volcanic Villarrica-Quetrupillán-Lanín.VilIarrica-Quetrupillan-Lanin. The km become bigger: 4.6º;4.69; being the slope more abrupt in resultsresults correspond to inversion of MT data revealingrevealing a the other flanksflanks (NW,(NW, SE).SE). TheThe purposepurpose ofof thisthis workwork con-con- high anomaly of the electrical conductivity atat 3km3km depthdepth sists in carrying out 2D magnetic modellingmodelling toto thethe wholewhole below the volcanic chain. In addition, anomaliesanomalies ofof inter-inter- ARGUS lines crossing the Tona Anomaly, using an interacinterac-- mediate resistivity areare observedobserved thatthat coincidecoincide withwith thethe tive programprogram toto estimateestimatethe thecoordinates coordinatesof ofthe thebodies” bodies“ locationIocation ofof thermalthermal sourcessources ofof low-mediumlow-medium temperaturetemperature vertices andand toto useuse thethe EulerEuler deconvolutiondeconvolutionto toIimit limitthe the or monogenic volcanic activity. Possibly, Possibly, fault fault systems systems depth of the sources. By the analysis of the results, we would serve as fluidfluid pathways.pathways. willwiII do inferences about the bodies that compose the The study of geothermal systems in southern Chile willwiIl Tona and verify the conclusion obtained by the 3D analyanaly-- continue withwith thethe investigationinvestigationof ofthe theTolhuaca Tolhuacageother- geother- sis. InIn addition, wewe wiIIwill inferinfer thethe possiblepossible Iinklink toto thethe southsouth mal system, located on the flanksflanks ofof TolhuacaTolhuaca volcano,volcano, Atlantic openingopening oror toto aa previousprevious extensionalextensional episode.episode. influencedinfluenced byby LOFSLOFS andand ATFATF asas well.well. MTMT datadata measuredmeasured inin the surroundings of the Tolhuaca volcano willwiII be anaana-- lyzed,lyzed, inin order to know the influenceinfluence ofof faultfault systemssystems inin aa Role of continental Iowerlower crustcrust followingfollowing thethe high temperature geothermal system. 2010 Mw 8.8 Maule earthquake: Insights These two studies willwiII allow us to compare geothermal from a power-Iaw rheology model with systems of different temperaturestemperatures inin thethe southernsouthern Chil-Chil- from a power-law rheology model with ean volcanic zone that are controlled by the same fault dislocation creepcreep systems. C. PeñaPefial'z,1,2, O. HeidbachHeidbachl,1, M. MorenoIVIoreno3,3, J. BedfordBedfordl,1, M. ZieglerZieglerl,1, A. TassaraTassara4,4, O. OnckenOnckenl'21,2 11HelmholtzHelmholtz Centre Potsdam, GFZ German Research Centre for GeosciGeosci-- 2D modelling of magnetic anomalyanomaly TonaTona onon ences, Potsdam, Germany 22FreieFreie Universität Berlin, Berlin, Germany the Argentine continentalcontinentalmargin margin 33UniversidadUniversidad de Concepción,Concepcio’n, Departamento de Geofísica,Geofisica, Concepcion,Concepción, A. C. Pedraza De MarchiMarchil'z,1,2, M. E. GhidellaGhidella3,3, J. R. FranzFranz-- Chile 44Universidad de Concepcio’n, Departamento de Ciencias de la Tierra, 1,2 Universidad de Concepción, Departamento de Ciencias de la Tierra, eseese1'2 Concepción,Concepcion, Chile 11CentroCentro de investigaciones GeologicasGeológicas (CIG)(CONICET—UNLP),(CIG)(CONICET-UNLP), LaLa Plata,Plata, Argentina InIn the years following largelarge magnitude earthquakes, the 2 2CONICE'I',CONICET, Buenos Aires, Argentina surface deformation isis transienttransient andand occursoccurs atat highhigh andand 33InstitutoInstituto AntarticoAntárticoArgentino, Argentino,Buenos BuenosAires, Aires,Argentina Argentina variable rates decaying with time. This Thisdeformation deformationis is ARGUS was a joint program between NRL (Naval ReRe-- mainly a superposition ofof deformationdeformationprocesses processessuch suchas as search Laboratory, U.S. Navy) and SIHN (Servicio de HiHi-- afterslip andand viscoelasticviscoelasticrelaxation. relaxation.The Thehigh highdata dataquality quality drografia Naval,Naval, ArgentineArgentineNavy), Navy),whose whoseobjective objectivewas wasto to of continuous GlobalGlobal PositioningPositioningSystem System(cGPS) (cGPS)stations stations carry out a detailed survey of the Argentine continentalcontinental recordingrecording surface displacements following the 2010 MwIVIw shelf. The acquisition ofof datadata waswas donedone inin twotwo surveyssurveys 8.8 Maule earthquake has triggered a number of studies one in 1991 and the other in 1993. Ghidella et al. (1995) investigatinginvestigating postseismic postseismicdeformation deformationprocesses. processes.These These carried out a series of processes to the data in order to studies incorporate models that are either linear elastic obtain a magnetic anomalyanomaly grid,grid, thethe analysisanalysis ofof thisthis gridgrid or linear viscoelastic assuming assumingthat thatthe thewhole wholecrust crustis is revealedrevealed two regionsregions of markedly distinctivepattern patternsep- -sep elastic. InIn thisthis studystudy wewe investigateinvestigatethe theroIe roleof ofpower-Iaw power-law arate by the „Colorado discontinuity“.discontinuity”. The Thedescription description rheologyrheology (non-linear(non-Iinear viscosity) with dislocation creepcreep forfor the crust and upper mantle on the postseismic deformadeforma-- 70 ABSTRACTS tion associatedassociated toto thethe 20102010 MauleMaule earthquakeearthquake usingusing aa 3D3D 55DepartmentDepartment of Geological Sciences and Land Use and Environmental geomechanical-numerical model and six-yearsiX—year postseispostseis-- Change Institute (LUECI),(LUECI), UniversityUniversity ofof Florida,Florida, Gainesville,Gainesville, UnitedUnited States mic cGPS observations. 66GEOMAR,GEOMAR, Helmholtz Center for Ocean Research, Kiel, Germany 77UniversityUniversity of Minnesota at Duluth, Large Lakes Observatory, Duluth, I'MEMNIJainiulatmn _l- _' . - . III. .._.‚.‚ ‚ United States

i- I -"I"|-' '|‘-.'I-l'|"n' Illi.'

ein" ' ﬂ Lacustrine sediment records that possess detailed, long- Ei'p' term data on past climate and environmental conditions are rare in the northern Neotropics. Exceptions includeinclude the sediment sequences from LakesLakes Chalco, Nicaragua, and PeténPeten Itzá,Itza, which span multiple glacial/interglacial glacial/interglacial

aü- Ilau cycles. Lake PeténPeten ItzáItza is a deep (zmax=165 m), large (100 “1 I H .'.' - - ..:J.:- . "F _' ' _'.x '1- ‚ LIZIIJ- ._ . ._ . .1 . .mü - - '-I u - r. km2) closed-basin karst lake in the lowlandsIowlands of northern III 1-30 20i] JÜÜ 405 SÜEI Unihmcil ‘rnrn |hl"'.'IE'l'l|:l'| ifk ri'IfI Guatemala that possesses a ~400-ka“400-ka paleoecological rere-- cord. Itlt reacts sensitively toto changeschanges inin thethe balancebalance be-between evaporation andand precipitationprecipitation(E/P) (E/P)and andtherefore therefore has experienced dramatic changes changesin inwater waterIeveI. level.This This We firstfirst investigateinvestigatethe theimpact impactof ofpossible possibledislocation dislocation makes Lake PeténPeten ItzáItza an ideal target for study of past creep parameters on the afterslip distributiondistributionfrom fromthe the aquatic andand terrestrialterrestrial environmentalenvironmental variabilityvariability andand toto inversioninversion of the cumulative postseismic postseismiccGPS cGPSobserva- observa- explore the ecological responses of aquatic andand terrestri-terrestri- tions following following the themain mainshock. shock.We find We that findafterslip that afterslip al communities t0to abruptabrupt climateclimate changechange inin thethe Iowlandlowland distributions are aresensitive sensitiveto dislocation to dislocationcreep param- creep param- northern Neotropics. eters. In particular, wewe findfindthat thatthe theIargest largestdifferences differences We used the ostracode and pollen records from from simulations areare foundfound atat depthsdepths >> 6060 kmkm oftheof the faultfault ~75.9-m-long“75.9-m-long core PI-6, Lake PeténPeten Itzá,Itza, to explore biotic interface.interface. As the rootroot mean square error (RMSE)(RIVISE) from responsesresponses to abrupt climate and environmental changes our two best-fitbest-fit afterslipafterslipdistributions distributionsis isnot notconclusive conclusive during the last 85 ka. Detrended Correspondence AnalyAnaly-- we compare the cumulative momentmoment releaserelease fromfrom after-after- sis (DCA) on fossil counts was used tot0 assess the impact of shock seismicity at the plate interface with the inverted climate change on aquatic andand terrestrialterrestrial communitiescommunitiesby by afterslip distribution.distribution.The Theresulting resultingviscoelastic viscoelasticrelaxation relaxation quantifying thethe magnitudemagnitude andand raterate ofof ecologicalecological changechange from our preferred simulation mainlymainly occursoccurs inin thethe conti-conti- of ostracode and pollen data, employing the R package nental lowerIower crust as wellwelI as mantle lithosphereIithosphere beneath „paleoMAS“.„paIeoI\/IAS”. Temperature and E/P have been the main the volcanic arc due to dislocation creep creepprocesses. processes.In In environmental variables shaping aquatic andand terrestrialterrestrial particular, viscoelastic viscoelasticrelaxation relaxationin the incontinental the continental communities duringduring thethe lastlast 8585 ka.ka. AquaticAquaticcommunities communities lowerIower crust reducesreduces or eliminates the need of deep afaf-- displayed larger ecological changes than pollen, as meamea-- terslip. Therefore, our resultsresults suggest that viscoelastic sured by SD, which may be explained by the relatively relaxationrelaxation processesprocesses inin thethe continentalcontinentalIower lowercrust crustmay may short lifeIife cycle of ostracodes. The crustaceans genergener-- be a key postseismic process following the 2010 Maule ally led changes in vegetation, indicatingindicatingthe thefaster fasterre- -re earthquake as well as its combination withwith thethe cumula-cumula- sponse time ofof thisthis aquaticaquaticcommunity communityto toenvironmental environmental tive momentmoment releaserelease byby aftershocksaftershocksmay maypotentially potentiallybet- -bet changes, relative t0to thethe responseresponse timetimeof ofvegetation. vegetation.We We ter constrain afterslip inversions inversionsfollowing followingmegathrust megathrust identifiedidentified shifts shiftswith withgreater greaterecological ecologicalchanges changesin inspe- -spe earthquakes, especially its maximum depth. cies during cold and dry Hs and the cold and wet LastLast GlaGla-- cial Maximum. During Hs, numbers ostracode and pollen taxa decreased, however overall ostracode abundances A lateIate Quaternary paleoecological record increased,increased, probably trigged by lowerIower lakelake levelsleveIs and exex-- from Lake PeténPeten Itzá,Itzä, Guatemala: effects pansion of littoralIittoral zoneszones withwith abundantabundant aquaticaquaticplants. plants. of abrupt climate change on aquatic andand Ecological change within the lake was especially high during H6 and H5. Rates of ecological change (SD/100 terrestrial communities in the Iowland terrestrial communities in the lowland yr) were largerIarger during Hs, and ostracode velocities markmark northern Neotropics perfectly the onset and end of each Hs, highlighting thethe L. PérezPerezl,1, A. Correa-MetrioCorrea-IVIetrioZ,2, S. CohuoCohuo3,3, L.L. Macario-IVIacario- high sensitivity andand rapidrapid responseresponse ofof thesethese crustaceanscrustaceans GonzalezGonzalez“,4, M. BrennerBrenner5,5, S. KutterolfKutterolfö,6, M. StockheckeStockhecke’,7, A. to climate change. Ostracodes were not always present SchwalbSchwalb11 throughout the core, contrasting thethe continuouscontinuouspollen pollen 11InstitutInstitut fürfür GeosystemeGeosysteme undund Bioindikation,Bioindikation,Technische TechnischeUniversität Universität record,record, which provided with importantimportant ecological and Braunschweig, Braunschweig, Germany environmental information inin thethe catchment,catchment, thatthat oth-oth- 22InstitutoInstituto dede GeologI’a,Geología, UniversidadUniversidad NacionalNacional AutönomaAutónoma dede Me’xico,México, erwise would have remained unknown. Our results demdem-- Ciudad de México,Mexico, Mexico onstrate the valuevaIue of combining sedimented aquatic andand 33TecnolögicoTecnológico Nacional de México/I.T.Mexico/LT. de Chetumal, Chetumal, Mexico 44TecnolögicoTecnológico Nacional de México/I.T.Mexico/LT. de la Zona Maya, Quintana Roo, terrestrial biological variables to explore the responseresponse Mexico ABSTRACTS 71 of terrestrial and freshwater aquatic communitiescommunitiesto tocli- cli- haviour of the upper crust; age of the subducted oceanic mate change in the lowlandIowland northern Neotropics. crust; percentage of melting andand assimilationassimilationof ofcrustal crustal melts; plate convergence parameters and conditions ofof the lithosphericIithospheric mantle. Accordingly, the distribution ofof Marine forearc structure of the 2014 Mw 8.1 volcanoes is conditioned byby thesethese variables,variables, resultingresultingin in IquiqueIquique earthquake revealedrevealed by hypocenter the clusteringClustering of volcanoes in sectors where the condicondi-- tions ofof storage,storage, ascentascent andand eruptioneruptionare arefavourable. favourable. Iocations from offshore observations locations from offshore observations The migrations and/orand/or spatialspatialpropagation propagationof ofvolcanoes volcanoes F. PetersenPetersenl,1, D. LangeLangel,1, I.I. GrevemeyerGrevemeyerl,1, H. KoppKoppl,1, E. depend on both, the geotectonic variations (changes(changes inin Contreras-ReyesContreras-Reyesz,2, S. BarrientosBarrientos33 the angle of subduction, subductionsubductionof ofasymmetric asymmetricridg- ridg- 11GEOMARGEOMAR Helmholtz Centre for Ocean Reseach Kiel, Kiel, Germany es, etc.) and crustal properties (variation(variationin instress stressfields, fields, 22UniversidadUniversidad de Chile, Departamento de Geofísica,Geofi’sica, Santiago,Santiago,Chile Chile existence of pre-Andean crustal anisotropies, etc.). ColCol-- 3 3UniversidadUniversidad de Chile, Centro SismológicoSismolögico National, Santiago,Santiago,Chile Chile lectively,lectively, thesethese boundary boundaryconditions conditionsdetermine determinethe ex- the- ex istenceistence of the main volcanic arc parallel to the Andean On April 2014 the Iquique earthquake ruptured with MwIVIw axis, transvers volcanic chains, but also volcanic fields,fields, 8.1 in the central part of a well-knownweII-known seismic gap and the internal distribution ofof volcanicvolcanic centrescentres isis apparentlyapparently leftIeft twotwo smallersmaller unbrokenunbroken adjacentadjacent segmentssegments inin north-north- random.random. ern Chile. This major earthquake and the large amount Overall, the Central Volcanic Zone (CVZ: 18°-28°S) concon-- subsequent aftershock seismicityseismicity offerofferthe thepossibility possibilityto to stitutes a arather ratherwide wideorogenic orogenicsystem system(the (theAltiplano- Altiplano- study the heterogeneous structure of the marine forearc Puna), in which the differences betweenbetween arcarc andand backarcbackarc and to investigate thethe transitiontransitionto tothe theremaining remainingunrup- unrup- signatures of the magmas are currently debated. By concon-- tured seismic gap. From December 2014 until NovemberNovember trast, the Southern Volcanic Zone (SVZ: 32°-46°S) is akin 2016, we deployed two consecutive amphibiousamphibious seismicseismic to a more conventional orogenicorogenic systemsystem andand wherewhere thethe networks of 15 Ocean Bottom SeismometersSeismometers (OBS)(OBS) thatthat arc and backarc signatures are more apparent. covered the IquiqueIquique 2014 rupture area and the adjacent Composite and monogenetic volcanoesvolcanoes dodo notnot dif‘ferdiffer unbroken region to the south. Besides the offshore datadata substantially inin bothboth oftheseof these volcanicvolcanic regions.regions. WithWith theirtheir we use onshore stations from fromof ofthe theIPOC IPOC(Integrated (Integrated peculiarities, they theyrespond respondto tocommon commonprocesses processesthat that Plate Boundary Observatory Chile) and CSN (Chilean generate a spectrum of similar volcanic forms. However, Seismological Service) networks. collapse calderas differ notably notablyboth bothin incharacteristics characteristics We present hypocenter locationsIocations detecteddetected usingusing aa Io-lo- and composition. Notably,Notably, collapsecollapse calderascalderas ofof thethe CVZCVZ cal back-projection methodmethod integratedintegrated inin SeisComP3.SeisComP3. Ar-Ar- are larger, compositionally homogeneous homogeneousand andwidely widely rivalrival times andand theirtheir qualityquality estimatesestimateswere werefurther furtheren- -en spaced. Collapse calderas of the SVZ are smaller, more hanced with MannekenPixIVIannekenPix (MPX)(IVIPX) picking algorithm for diverse in composition of oftheir theirvolcanic volcanicproducts productsand and firstfirst P-waveP-wave arrivals.arrivals. Furthermore,Furthermore, wewe calculatedcalculated double-double- do not show finalfinal episodesepisodes ofof resurgenceresurgence inin theirtheir cycles,cycles, differencedif'ference hypocenter hypocenter relocations relocationsbased basedon onwaveform waveform compared to calderas of the CVZ. The size and geometry cross-correlations.cross—correlations. of Andean volcanic fieldsfields alsoalso differdifferin inboth bothregions. regions.In In MostIVIost of the seismicity occurs between 19.5°S and 21°S the CVZ, arc signatures can be recognizedrecognized more than 300 up-dip of the maximum coseismic slip of the 2014 mainmain-- km eastward ofofthe the main arc, whereas in most ofofthe the SVZ, shock. The seismicity at seismogenic depths is highly the volcanic fieldsfields atat equivalentequivalent distancesdistances fromfrom thethe arcarc focused forming well-definedwell-defined Clusters. clusters.The Theobserved observed display retro-arc or intra-plate signatures. The volumes seismicity provides constraints on the structure of the of erupted magma (not taking into account the volume marine forearc and the postseismic deformation. We We of equivalent intrusive bodies) during Cenozoic times areare relaterelate the seismicity distribution toto thethe backgroundbackground seis-seis- an order of magnitude largerIarger in the CVZ than in the SVZ. micity, seafloorseafloor morphology,morphology, andand regionalregional tectonics.tectonics. The differences inin thethe characteristicscharacteristicsof ofvolcanism volcanismin in both zones should be studied as effects ofof independentindependent causes, conditioned by by regional regional variables variables that thatrequire require The Central and Southern Volcanic Zones of interdisciplinaryinterdisciplinary studies. The existing databasesdatabases ofof agesages the Andes, what we know and what we do and geochemical compositions are arelimited limitedand andrequire require not know an increase in basic information to to improve improveIocal localand and regionalregional interpretations.interpretations. TheThe classicclassic cartographycartography ofof vol-vol- I.l. A. Petrinovic canic centres is an indispensable tool in order to reconrecon-- CICTERRA, CONICET-UNC,CONICET—UNC, Córdoba,Cördoba, Argentina [email protected]@conicet. struct the volcanic past and the characteristics ofof eacheach gov.ar volcano and, in the case of active volcanoes,volcanoes, allowsallows toto The Andean volcanism is represented by a great variety assess their potential hazard.hazard. InIn pastpast decades,decades, almostalmost allall of volcanic structures, the formation ofof whichwhich dependsdepends volcanological schools in Latin AmericaAmerica emphasizedemphasized thethe on a number of variables. These include: the existence need to understand the „personality“„personality” of each volcano, and characteristics ofof crustalcrustal reservoirs;reservoirs; rheologicalrheological be-be- which cannot simply be transferred to another volcano. This prevented, in multiple situations,situations,the thepossibility possibilityof of 72 ABSTRACTS

grouping and quantifying processesprocesses inin volcanicvolcanic regionsregions presumed that at initial trappingtrapping conditionsconditionsexist existtwo twoim- -im that allowed regionalregional interpretations. ThatThat isis why,why, inin thethe miscible melts, one carbonate phase and a silicate melt, coming decades, one of the challenges will be to findﬁnd thethe indicatingindicating suchsuch aa complexcomplex melt/melt/fluidﬂuid phase phasesystem systemdur- dur- causal relationships that thatgovern governsimilarities similaritiesand anddiffer- -differ inging the emerald crystallization. ences in the Andean volcanic registers.

Volcano-tectonic analysis at the northern First qualitative observationsobservationsand and terminus of the Liquiñe-OfquiLiquiﬁe-qui Fault Zone interpretationinterpretation ofof ﬂuidfluidand andmelt meltinclusions inclusions (38°S): The Copahue Volcano, Argentina from Capoeirana and Nova Era emerald E. PitzkePitzkel,1, P. L. GöllnerGöllnerl,1, J. O. EisermannEisermannl,1, I.I. PetrinovicPetrinovicz,2, deposits, Minas Gerais, Brazil. U. RillerRiller11 I.l. PinteaPinteal,1, H. A. HornHorn22 11UniversitätUniversität Hamburg, Institut fürfür Geologie,Geologie, Hamburg,Hamburg, GermanyGermany 22CentroCentro de Investigaciones enen CienciasCiencias dede lala TierraTierra (CICTERRA),(CICTERRA), Cör-Cór- 11RomanianRomanian Geological Institute, Geology,Geology, Buchareste,Buchareste, RomaniaRomania doba, Argentina 22UFIVIG,UFMG, Geology, Belo Horizonte-MG,Horizonte-M6, Brazil

Emeralds, near Belo Horizonte, contains complex pepe-- Copahue volcano, located at the latitude ofof 38°S,38°S, isis oneone of the most active volcanoes volcanoes in inthe theSouthern SouthernAndean Andean culiar multiphase fluid/meltfluid/meltinclusions. inclusions.Occuring Occuringin inthe the Volcanic Zone. Situated around 30 km eastwards of the Northern Part of the Iron Quadrangle, they are found in Volcanic Zone. Situated around 30 km eastwards of the main magmatic arcarc andand atat thethe westernwestern marginmargin ofof thethe 2020 Qtz+Am-Phl-schist with+Chr,with+Chr‚ intercalated with Hc-Chr- x 15 km Agrio Caldera, the volcano is part of the 90 km Phl-Am-schists, amphibolites and quartzites in rocks of x 15 km Agrio Caldera, the volcano is part of the 90 km longlong NE-SWNE—SW trending Callaqui-Copahue-Mandolegüe the GuanhãesGuanhäes Complex, cutted byby pegmatitespegmatitesof ofAmazo- Amazo- transverse volcanic lineament. The volcano is spatially nian and Brasiliano age. Probably three different tectonictectonic transverse volcanic lineament. The volcano is spatially associated with the NE-striking LomínLomin Fault, which is events caused the structuration ofof thisthis region,region, suggest-suggest- kinematically linked with the northern terminus of the inging two emerald generations. At At room room temperature temperature a a kinematically linked with the northern terminus of the Liquiñe-OfquiLiqui'ne-qui Fault Zone. This peculiar position of ofthe the CO2C02 phase (liquid + gas) between 40-60 vol% is associassoci-- volcano prompted a number of studies to investigate thethe ated with mineral grains; sometime also alsowith witha liquid. a liquid. tectonic regime of the area and its possible control on Mainly primary and pseudosecondary, are associated tectonic regime of the area and its possible control on the formation ofof CopahueCopahue volcano.volcano. However,However, thethe evolu-evolu- with silica rich solid inclusions containing the same carcar-- tion ofof thethe volcano,volcano, notablynotably thethe successionsuccession ofof thethe Copa-Copa- bonic assemblage suggesting heterogeneous heterogeneoustrapping, trapping, hue lavas - forming the volcano edifice - have received rememberingremembering silicate glass inclusionsinclusions described in topatopa-- hue lavas - forming the volcano edifice - have received littlelittle attention.attention.To Toremedy remedythis thisde ficit,deficit,the thenorthern northernand and zite. The same assemblage is found in narrow capillary eastern flanksflanks ofof thethe volcanovolcano werewere mappedmapped inin detaileddetailed inin tubes (1-20µm(1-20um in width and >800µm>800um in length)length) in parpar-- terms of lithologylithology and structure. Our study shows that allel alignment of primary origin. The carbonate rich inin-- the Copahue Volcano Formation consists consists of oftwo twomain main clusions have various shapes from 10µm10um up to >150µm,>150um, lavalava flows:flows: AA lowerlower massivemassive basalticbasalticflow flowdisplaying displayingco-- co distributed parallel to the capillary tubes or in cicatrized lumnar jointing, termed Unit 1, and an upper basaltic fissures.fissures. TheThe smallsmall quartzquartz microcrystalmicrocrystal formedformed afteraftertrap- trap- lumnar jointing, termed Unit 1, and an upper basaltic ping have generally short knife shapes of 40 to 100µm,100um, to andesitic flow,flow,termed termedUnit Unit2. 2.Both Bothunits unitsare areoverlain overlain by a minor blocky vesicular basaltic flow, flow,termed termedUnit Unit always with a solid carbonates attached toto thethe base.base. Fre-Fre- 3. Unit 1 appears to have covered a much larger area quently the glass silicate inclusions have one ore more than evident by itsits present exposure. IndividualIndividual patches black dots, representing shrinkageshrinkage bubbles.bubbles. DuringDuring heat-heat- of this unit represent remnants of an initially largelarge lavalava inging the CO2C02 gas bubbles homogenized onto the liquidliquid flow,flow, ratherthanrather than individualindividual subglacialsubglacial vents,vents, asas interpret-interpret- CO2C02 phase around 29-30oC, sometime showingshowing criticalcritical ed by others. In contrast to previous studies, lithologi- homogenization. GenerallyGenerally thethe inclusionsinclusions ofof bothboth typestypes ed by others. In contrast to previous studies, lithological contacts clearly demonstrate a deposition ofof UnitUnit 11 (carbonic(carbonic and silicatic) decrepitated decrepitatedaround around3000C. 300oC.On On prior to Unit 2, which requires revision of the volcanic further heating somesome ofof thethe solidsolid phasesphases startstart toto meltmelt inin stratigraphy. IVIoreover, Moreover,glacial glacialstriations striationsaffecting affectingboth both a dark liquid phase supposed to be a carbonate liquid. Unit 1 and Unit 2 indicate that both units were deposited Accidentally one carbonate inclusion containing (CO2(C02 liqliq-- before or during the last glacial period at these latitudes. uid + CO2C02 gas) do not decrepitated and after quenchingquenching The absence of glacial marks on Unit 3 indicates post- from about 800oC8000C showed the same fluidfluid carboniccarbonic as-as- glacial deposition ofthisof this unit.unit. InIn addition,addition,our ourfield-based field-based semblage as before heating andand thisthis couldcould bebe interpretedinterpreted study did not reveal any evidence for a structural concon-- that the CO2C02 fluidfluid phasephase waswas generatedgenerated fromfrom thethe carbon-carbon- trol generating thethe volcanicvolcanic flows,flows,as assuggested suggestedby byother other ate rich phase „in situ“situ” when the temperature reach the workers. Collectively, ourour resultsresults permitpermit aa preciseprecise spatio-spatio- critical point. point.The Thesame sameprocess processmay maybe involved be involvedafter after temporal reconstruction of the formation of Copahue the initialinitial trappingtrapping ofof thethe carbonatecarbonate meltmelt whenwhen thethe C02CO2 temporal reconstruction of the formation of Copahue volcano and may therefore aid in understanding better separate to CO2-liquidC02-liquid + CO2-gasCOZ-gas phases with temperatempera-- the history of the Copahue volcano and the associated ture decrease. The complex inclusionsinclusions contain at roomroom temperature carbonate and silica richrich phases so can be ABSTRACTS 73

Agrio caldera. Detailed geological maps generated in the With the aim of gaining insight into the VPMVPIVI strucstruc-- course of this study promise to be of importance for fufu-- ture and evolution, wewe developeddeveloped aa 3D3D forwardforward gravitygravity ture studies. model using IGMAS+IGIVIAS+ software, constrained constrained by by bathy- bathy- metric, magnetic andand seismicseismic information.information.On Onthe thecon- con- eastErn ﬂank of the Cupahue acanu GEqgical map cf the tinental shelf shelfand andthe theArgentine Argentinecontinental continentalmargin, margin,

ﬁ rl'ﬂrw ‘- ‘r ‘f'_.'- 1;," '-‘-'."—- ' 'l-Il'

r seismic, gravity, and magnetic studies studies were were performed performed 31":‚3' .Ii to describe and characterize the sedimentary basins and the ocean–continentocean—continent transition. transition.Particularly, Particularly,23000 23000km km of multichannel seismic seismicdata, data,acquired acquiredand andpublished published by the Federal Institute forfor GeosciencesGeosciences andand NaturalNatural Re-Re- sources, (BGR, Germany) and 6900 km of multichannel seismic data, acquired and published from the National Commission on the Outer Limit of the Continental ShelfShelf (COPLA,(COPLA, Argentina) werewere includedincluded asas constrainingconstraining datadata inin our model. The bathymetric data consist ofofthe the depth and seabed topography, while seismic interpretation provid-provided the depth and topography from crystalline basement, the fullfuII sedimentary thickness and itsits compressional Buiiding stages of thr.I Cupahue Volcano wave velocities, SDRsSDRs andand thethe HVLCHVLC bodiesbodies Iocationlocationand and p ’ ‚._ 4. J I . . F Etage 1; _ Etage I: finally inin somesome crosscross sections,sections,depth depthand andtopography topographyof of flepm l1," LII-IH L "—"'- ÜIJFHJIE'II: |_|| I_.'I|||_ E“ IF‘rE-."5r_vI'--‚_]l.n.i-Lt|l I the Moho.IVIoho. Densities assigned assignedto tothe thedifferent differentbodies bodies composing the 3D model were calculated from comcom-- pressional wave velocities andand extractedextracted fromfrom previousprevious published works. A very good fitfit betweenbetween observedobserved andand calculated gravity anomalies was attained. Also,Also, flexuralflexural and localIocal isostatic calculationscalculationswere werecarried carriedout. out.Our Ourre- -re Structure of the Argentine passivepassive volcanicvolcanic sults allowedaIIowed to further investigate densitydensity distributiondistribution and thickness variations ofof thethe superstructuressuperstructures asas con-con- continental marginmargin fromfrom 3D3D gravitygravity modellingmodelling tinental, transitionaltransitionaland andoceanic oceaniccrusts crustsalong alongthe theVPIVI VPM and isostatic calculationscalculations and to estimate thethe extensionextension ofof magmaticmagmaticunderplating. underplating. C. PrezziPrezzil,1, M. A. AreccoAreccoz‚2, F. RuizRuiz33 11UniversidadUniversidad de Buenos Aires - CONICET, Instituto dede GeocienciasGeociencias Básicas,Bäsicas, Aplicadas y Ambientales de Buenos Aires (IGeBA), Dpto. Cs. Extension of the Ordovician pre-Andean Geológicas,Geolögicas, FCEyN, C.A.B.A.,C.A.B.A.‚ Argentina 22UniversidadUniversidad de Buenos Aires, Facultad de Ingeniería,Ingenieria, Instituto dede Famatinian arcarc inin NortheasternNortheastern Mexico:Mexico: Geodesia y GeofísicaGeofisica AplicadasAplicadas (IGGA),(IGGA), C.A.B.A.‚C.A.B.A., ArgentinaArgentina Peregrina tonalite 33UniversidadUniversidad Nacional de San Juan, FCEFyN, IGSV, Ruta 12 Km 17, Rivadavia, San Juan, Argentina J. A. Ramirez-Fernandez1fl, E. A. Alemán-GallardoAIemän-Gallard01‚1, F. Velasco-TapiaVelasco—Tapial,1, U. JenchenJenchen1‚1, R. BecchioBecchio22 The Argentine volcanicvolcanic passivepassive marginmargin (VPIVI)(VPM) waswas devel-devel- 11UniversidadUniversidad AutónomaAutonoma de Nuevo León,Leön, Facultad de Ciencias de laIa oped between Rio Grande Rise and the Agulhas–MalviAgulhas—IVIaIvi-- Tierra, Linares, Mexico nas/Falkland fault between ~"’ 36º369 and 48ºS.4895. Its formation 22UniversidadUniversidad Nacional de Salta, Instituto dede InvestigacionesInvestigacionesen enEnergia Energía began in the Late Jurassic/Early Cretaceous, starting inin No Convencional, Salta, Argentina the South (approximately 49ºS)4995) and gradually shifting toto the North. The opening of the South Atlantic tooktook placeplace The Precambrian and Paleozoic basement of the LarLar-- between approximately 137 and 126 Ma and was acac-- amidic Sierra Madre Oriental in NE is wellwelI exposed in the companied by extensive transient magmatism. InheritedInherited eroded core of the Huizachal-PeregrinaHuizachaI-Peregrina Anticlinorium. crustal discontinuitiesgenerated generatedduring duringthe theperiod periodex-- ex ItIt isis composed by four different blocksblocks inin contactcontact alongalong tending from the Transamazonian cycle (2300–1800(2300—1800 Ma) sharp faults. Two metamorphic lithodemsIithodems are the NeoNeo-- to the Gondwanic cycle (350–250(350—250 Ma)IVIa) controlled in part proterozoic granulitic NovilloNovillo GneissGneiss complex,complex, whichwhich be-be- the evolution andand characteristicscharacteristicsof ofthe theVPIVI. VPM.The TheVPIVI VPMis is longslongs to the Oaxaquia Microcontinent andand thethe GranjenoGranjeno ~N 60–12060—120 km wide, depending on the latitude;Iatitude; presentspresents Schist complex, metamorphosed during the CarboniferCarbonifer-- seaward-dipping reflectorsreflectors (SDRs)(SDRs) andand hashas high-velocityhigh-velocity ous under green-schist facies and part of the Granjeno- lower-crustIower-crust (HVLC)(HVLC) underplated bodies. Four segments AcatlánAcatlan Belt. The third block is an incomplete strongly (I,(I, II,II, IIIIII and IV)IV) were identifiedidentified along alongthe theVPIVI VPMseparat- separat- deformed siliciclastic sequence sequenceSilurian Silurianto toPermian Permianin in age that comprises the highly restricted Tamatän Ba- ed by Transfer Fracture Zones (the Malvinas/Falkland,IVIaIvinas/Falkland, age that comprises the highly restricted Tamatán Ba- sin. The fourth block is represented by a plutonic body Colorado, Ventana and Salado Transfer Fracture Zones), sin. The fourth block is represented by a plutonic body described ad Peregrina Tonalite (PTo), emplaced in the which controlled the architecture, volume and width of described ad Peregrina Tonalite (PTo), emplaced in the the SDRs basaltic wedges.wedges. Novillo Gneiss and in tectonic contact to the Granjeno 74 ABSTRACTS

Schist. PTo was described early as an orphaned block asas-- preserve marginal ridges. Trachyte couléescoulees include autoauto-- sociated with an enigmatic CarboniferousCarboniferous magmaticmagmaticarc arc brecciated facies of porphyric texture with anorthoclase locatedIocated along the NW margin of Gondwana. Major and phenocrysts and minor trace element concentrations andand ratiosratiosof ofPTo PToindicate indicate ferromagnesian minerals. Groundmass isis trachytic a link to a continental arcarc developeddeveloped alongalong Gondwana’sGondwana´s composed of sanidine microliths and clinopyroxene. TraTra-- NW margin. New U–PbU—Pb LA–ICP–MSLA—ICP—MS data from PTo zircons chyte lavaIava flowsflows areare porphyricporphyric withwith feldsparfeldspar phenocrystsphenocrysts includedincluded a youngest LateLate Ordovician (Katian(Katian stage)stage) popu-popu- (of(of oligoclase to anorthoclase composition) setset inin aa tra-tra- lationlation atat 448.8448.8 i-± 2.92.9 Ma,Ma, interpretedinterpreted asas thethe crystallisationcrystallisation chyte groundmass with some bostonitic patches.patches. Micro-Micro- age, and an oldest Grenvillian population interpretedinterpreted asas lithsliths of anorthoclase to sanidine composition, olivine, olivine, the potential ageage ofof itsits protolith.protolith. WeWe proposepropose aa compre-compre- clinopyroxene (Mg-rich augite), F-apatite andand magnetitemagnetite hensive model for the evolution oftheof the NENE MexicanMexican base-base- complete the groundmass assemblage. Two longIong basalbasal-- ment without the involvement of exotic or ororphaned orphaned tic flows flowsextend extendfor forseveral severalkilometers kilometersenveloping envelopingthe the terranes. Peregrina Tonalite representsrepresents an new reportedreported CMTV. Three scoria cones surround the magmatic arcarc inin NENE MexicoMexico establishedestablished duringduring thethe LateLate CMTV; within the main crater, there are two oxidized Ordovician, described as the Peregrina–MochonianPeregrina—Mochonian deposits of scoria that would correspond to a very eroderod-- Orogeny. It represents an extension of the Chiapas MoMo-- ed cone, younger than the trachyte coulées.coulees. The lowerIower-- chonian Orogeny (in S México)Mexico) and the South American most basaltic flowsflowssurrounding surroundingthe themain mainvolcanic volcanicbuild- build- Famatinian arcarc intointo NENE Mexico.Mexico. inging are vesicle rich,rich, either aphyric or porphyritic with with plagioclase phenocrysts and olivine microphenocrysts set in an intergranular groundmass with ophitic patchespatches Tortonian trachyte volcanoe in the Alta Sierra made of clinopyroxene and plagioclase. Trachyte flowsflows ofof de SomúnSomün CuráCurä Volcanic Complex. Northern the CMTV yielded a new whole rockrock K/Ar age (Fig. 1d) of 9.8 ±i 0.3 Ma, which fitsfits wellwell (within(within errors)errors) withwith alreadyalready Extrandean. Patagonia. Argentina Extrandean. Patagonia. Argentina published chronological data for other trachyte lavasIavas of M. RemesalRemesall,1, M. E. CerredoCerredol,1, J. M. AlbiteAlbitel,1, F. SalaniSalanil,1, C. ASSCVC ((l 9-13 Ma). ParicaParica22 11UniversityUniversity of Buenos Aires, Geology, Buenos Aires, Argentina Sponsored by UBACYT 20020170100554BA & PIPPIP-- 22UniversityUniversity of San Martin, InstituteInstitutefor forResearch Researchand andEnvironmental Environmental 11220130100579CO Engineering, San Martín,Martin, ArgentinaArgentina a 57:" ._ ‚ ‚ The Miocene Alta Sierra de SomúnSomun CuráCura Volcanic ComCom-- plex (ASSCVC) is the northernmost post-plateau complex of the SomúnSomün CuráCura Magmatic Province Province(SCMP), (SCMP),at atthe the northern extrandean Patagonia, Argentina (Fig.(Fig. 1a,1a, b).b). .r ASSCVC is made of several volcanic buildings which {J :5«-.._---'-'-"' l'

‚. ' l. I ' "In?“ l M: ' . span the basaltic to to trachyte trachyterealm. realm.Monogenetic Monogeneticba- ba- _SzraCLIra Planen - i-Tl‘Efä --| .5?!- --—--- I]- 501m iPcsi-Pialeau Camp'exas ' ' — saltic volcanoesvolcanoes (i.e.(i.e. CuatroCuatro Cerros),Cerros), trachytetrachyte apparatusapparatus —|_

(i.e.(i.e. Cerro Pancho) and polygenetic basalticbasalticto totrachyte trachyte Flug. 1 .| -. :r. _|'_:.;;|. II.||. |_.' E'II'J-F ' r‘t'n._|-.-"' ':.| :|: n_.'v-'|uI-| --r.|-:I.l| ..| 5i'.'.'l'-‘--" um": II .l- Ilnu‘ |.-' F-S:':.'.‘.'C. I.j I.':'u:'a._|I-.- E-Ir: |I'1|.||_;-- -':-'-':-| 'U-n'h'r- I.'.1:'.h-.-hr .-".-1r:r .d.‚_n..-‚.-|:-‚-‚.-„-|: 42.15:: nl .'.-l'n'| r-.'n'- Hai-.- in-w r-E i':-'-.'r-:. ".' *IIE-lr- lr.'.'." ‚1r- constructions (i.e.(i.e. CerroCerro Corona)Corona) composecompose thethe Complex.Complex. Four features distinguish ASSCVCASSCVC fromfrom otherother postplateaupostplateau complexes of the SCMP: its age, it is the youngest of the post-plateau assemblages; the lack of a compositional Electrical structure of the Andean orogenic gap between basaltic andand trachytetrachyte terms;terms; thethe absenceabsence ofof crust in Northern Chile at 23°S using rhyoliterhyolite differentiatesand andthe thepresence presenceof ofseveral severalemis- emis- magnetotelluric data sion centers associated with prominent volcanic concon-- F. Reyes Cördoval,1 D. Diaz Alvaradol'z,1,2 K. Slezak1'31,3 structions. F. Reyes Córdova , D. Díaz Alvarado , K. Slezak 1 This contribution dealsdeals withwith oneone ofof thethe chiechieflyfly trachyte trachyte 1UniversityUniversity of Chile, Department of Geophysics, Santiago, ChileChile 22CentroCentro de Excelencia en Geotermia de Los Andes, Santiago, ChileChile volcanoes of ASSCVC. The polygenetic stratovolcanostratovolcano ofof 33InstitutoInstituto VolcanolögicoVolcanológico dede CanariasCanarias (INVOLCAN),(INVOLCAN), Tenerife,Tenerife, SpainSpain Cerro Mimbre (CMTV), locatedIocated in the southern complex (Fig.(Fig.1c),isthe 1c), is the northernmost ofofthree three volcanoes arranged Subduction isis aa long-termlong-term processprocess atat thethe ChileanChilean margin.margin. along a NW-SE trend. CMTV is set within a local lowIow relief ItsIts occurrence has determined the development of magmag-- area dominated by volcanic landforms with general SE matism and anddeformation. deformation.For Forthis thisreason, reason,the Central the Central gentle slope.sIope. Two semicircular escarpments in the upup-- Andes have been a subject of several geophysical and permost CMTV are compatible withwith anan explosionexplosion crater.crater. geological studies over the last decades. Associated looseIoose deposits ofofwhite white color and finefine texture,texture, The magnetotelluric method (MT) is a technique which locatedIocated among coulées,coulees, are indicativeindicative ofof explosiveexplosive erup-erup- measures the variations of ofterrestrial terrestrialelectromagnetic electromagnetic tive facies.facies. AtAt leastleast fourfour Iobularlobular trachytictrachyticcoulees couléesemerge emerge fieldsfields andand relatesrelates themthem byby parametersparameters calledcalled impedanceimpedance from the domes distributed inin the CMTV; couléescoulees locallyIocally tensor and inductioninduction vectors,vectors, whichwhich areare sensiblesensible toto spa-spa- ABSTRACTS 75 tialtiaI variationsvariationsof ofelectrical electricalconductivity. conductivity.Thus, Thus,IVIT MTis isuse- use- LCT and NYF pegmatites asas anan indicatorindicator forfor fulfuI for imagingimaging hydrothermal alteration, magmatic magmaticsys- sys- the magmatic evolutionevolutionof ofthe theLas LasChacras Chacras tems and fault systems. Batholith, central Argentina The study area is locatedIocated in Chile at 23°S latitude.Iatitude. 1414 longIong period MT stations (LMT)(LMT) andand 66 broadbandbroadband MTMT sta-sta- E. RibackiRibacki1‚1, U. AltenbergerAltenbergerl,1, R. TrumbullTrumbullz,2, M. Lopez de tions (BMT)(BMT) werewere deployeddeployed inin thethe DomeykoDomeyko Range,Range, Pre-Pre- LuchiLuchP3 Andean Depression, Western Cordillera and Puna. The 11UniversityUniversity of Potsdam, Institute ofof Geosciences,Geosciences, Potsdam,Potsdam, GermanyGermany profileprofile has hasa aW-E W-Eorientation orientationand an andextension an extensionof 170 of170 2 GFZ German Research Centre for Geosciences, InorganicInorganic and IsotopeIsotope Geochemistry, Potsdam, Germany km. LMT stations were were Iocated locatedevery every10 10km; km;however, however, 33UniversidadUniversidad Nacional de Buenos Aires, Instituto dede GeocronologiaGeocronologia yy the lackIack of proper access and bad soil quality ledIed to a Geologia Isotopica, Buenos Aires, Argentina worse spatial coveragecoverage atat thethe SaIarSalar dede AtacamaAtacama (SdA)(SdA) ba-basin and Western Cordillera. BMT stations werewere placedplaced be-be- The Devonian Las Chacras Batholith in the Sierra de San tween LMT measurements in the Puna and the eastern LuisLuis in central Argentina showshow aa complexcomplex systemsystem ofof sixsix margin of the SdA. granitoid intrusions. The intrusions are emplaced along Two 2D inversions were carried out using WingLink a pull-apartpuII-apart structure in the Ordovician basement, which software. TheThe firstfirstinversion inversionresult resultused usedthe theLMT LMTdata dataand and isis composed of metasediments and S-type granites. The shows two contrasting domains. domains.The TheWestern Westerndomain domain individualindividual plutonspIutons are divided by different geochemicalgeochemical (WD)(WD) isis characterized by a resistivityresistivity >10000m>1000Ωm coincid-coincid- signatures and ages (Siegesmund et al.,aI., 2004). inging with a zone that was previously described as a cold Intra-graniticIntra-granitic pegmatitespegmatitesoccur occurin inaII allunits unitsof ofthe theLas Las lithosphericIithospheric block with high density, high seismic velocity Chacras Batholith but are most abundant in the south. and lowIow seismic attenuation.This Thisdomain domainis isspatially spatiallycor- -cor Some of the pegmatites reveaIreveal NYF-typeNYF-type mineralizationmineralization relatedreIated with the occurrence of Paleozoic intrusives.intrusives. A 55 (Nb-,(Nb-, Y-,Y—, REE-, F-rich phases; LiraLira et al.,aI., 2012). InIn contrast, km longIong high conductive zonezone (HCZ),(HCZ), reachingreaching thethe depthdepth the pegmatites ofof thethe OrdovicianOrdovician basementbasement areare ofof LCT-LCT- of 4 km and resistivity valuesvalues <10<10 Qm,Ωm, appearsappears wherewhere thethe type mineralization (Li,(Li, Cs,Cs, Ta).Ta). SdA is located.Iocated. The Eastern domain is dominated by HCZ. Coeval intrusions of stocks and dikes of lamprophyresIamprophyres The greatest anomaly can be related to the so calledcaIIed AlAI-- demonstrate a strong mantle component in the DevoniDevoni-- tiplanotipIano PunaPuna MagmaMagma BodyBody whichwhich hashas beenbeen interpretedinterpreted an magmatism. TheThe granitoidgranitoid intrusionsintrusions showshow aa northnorth toto as a MASH zone related to the Neogene Altiplano PunaPuna south directed increase in magmatic differentiationdifferentiationand and Volcanic Complex (APVC). AlongAIong the profileprofile twotwo manifes-manifes- crustal contamination, asas indicatedindicated byby radiogenicradiogenic Sr/Nd-Sr/Nd- tations ofof thethe APVCAPVC occur:occur: thethe PuricoPurico VolcanicVolcanic ComplexComplex isotopeisotope ratiosratios (Lopez(López dede LuchiLuchi etet aI.,al., 2017).2017). (PVC)(PVC) and LaLa Pacana caldera. The PVC has a high conducconduc-- The present work investigates the themineralogical mineralogicaland and tivity fromfrom 00 toto 88 km,km, meanwhilemeanwhile thethe LaLa PacanaPacana calderacaldera geochemical composition of ofthe thepegmatites pegmatitesand the and the shows a 300 ΩmQm anomaly from 12 to 22 km. granitoid hosts as its sources to provide new insights into the evolution ofof thethe magmaticmagmaticsystem systemand andthe thedeveIop- develop- W DU!“ um HEEJI. tL‘i'I umm man ‚um _ 1.tq Pfi_ü.l._Lü'rümJAIM I’-- —- ‘ - I _;__'|_'.'_ ment of the NYF mineralization. .'I|‘ . 5.-- .1.- | -' The present study focuses on the emplacement and E.- '.-'|- the evolution fromfrom primaryprimary meItsmelts atat differentdifferentstructural structural ‚._. r levelsIevels within the crust to differentiatedresidual residualmeIts melts as a carrier for high-technologyhigh—technology elements. In order to

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_ influenceinﬂuence of ofthe thesyn-magmatic syn-magmaticmaﬁc maficmantle-derived mantle-derived

‘l f .. meIts on the granitoids and therefore pegmatoid com-

5 melts on the granitoids and therefore pegmatoid com- -__ ;.----.v.; r.:=-' .1 position.poüﬁon. Lira,Lira, R. et al.aI. (2012): The IntragraniticIntragranitic PotreriIIosPotrerillos NYFNYF The second inversion uses the BMT data. It images sevsev-- Pegmatites and andtheir theirA-Type A-TypeHost HostGranites Granitesof the of Las the Las eraleraI HCZs with resistivity rangingranging betweenbetween 11 andand 2020 QmΩm Chacras-PotrerillosChacras-PotreriIIos Batholith, Sierra de San Luis, ArgenArgen-- appear. They can be associated with magmatism andand hy-hy- tina. TheThe CanadianCanadian IVIineragistMineralogist 50,50, 1729-1750.1729-1750. drothermal alteration zones.zones. LópezLopez de Luchi, M. et al.aI. (2017): Petrogenesis of the For the further work, 3D inversions are being perper-- postcollisionalpostcoIIisionaI MiddleIVIiddIe Devonian monzonitic to to granitic granitic formed using ModEMModEIVI algorithmaIgorithm and previously meamea-- magmatism ofof thethe SierraSierra dede SanSan Luis,Luis, Argentina.Argentina.Lithos Lithos sured data. 288-289, 191-213. Siegesmund, S. et al.aI. (2004): The Las Chacras-PotreChacras-Potre-- rillosriIIos batholith (Pampean Ranges, Argentina): structuralstructural 76 ABSTRACTS evidences, emplacement and timing ofof thethe intrusion.intrusion. In-In- ternational JournalJournal ofof EarthEarth SciencesSciences 93,93, 23-43.23-43.

InsightsInsights on the lithosphericIithospheric density structure of the Southern Central Andes and their foreland References Götze, H. J., & Lahmeyer, B. (1988). Application ofof three-dimensionalthree-dimensional 1 2,3 C. Rodriguez PicedaPicedal,, M. Scheck-WenderothScheck-Wenderothz'3,, M. L. interactiveinteractive modelingmodeling inin gravitygravity andand magnetics.magnetics.Geophysics, Geophysics,53(8), 53(8), Gomez DacalDacalz,2, J. BottBottz,2, C. PrezziPrezzi4,4, M. StreckerStrecker11 1096-1108. Schmidt, S., Götze, H. J., Fichler, C., & Alvers, M. (2010). IGMAS+–aIGMAS+—a 11UniversitätUniversität Potsdam, Institut fürfür Geowissenschatten,Geowissenschaften,Potsdam, Potsdam, new 3D gravity, FTG and magnetic modelingmodeling sottware.software.GEO—INFOR- GEO-INFOR- Germany MATIK Die Welt im Netz, edited by: Zipf, A., Behncke, K., Hillen, F., 22GFZGFZ Deutsches GeoForschungsZentrum Potsdam, 4.5 Basin ModelModel-- and Scheffermeyer, J.,J., AkademischeAkademische VerlagsgesellschaftVerlagsgesellschaftAKA AKAGmbH, GmbH, ling,ling, Potsdam, Germany Heidelberg, Germany, 57-63. 33RWTHRWTH Aachen, Aachen, Germany 44IGEBAIGEBA CONICET, Departamento de Ciencias Geológicas,Geologicas, Buenos Aires, Argentina

InIn a subduction setting,setting,the theoverriding overridingplate platestructure structureis is Evidences of early Holocene glacial advance one of the major controls in the formation ofof strongstrong andand inin Lachman Beach, James Ross Island,Island, weak areas within the crust, affectingthe theIocalization localization Antarctica; andand highhigh IatitudelatitudeIinkages linkagesin in and extent of deformation. InIn thethe casecase ofof thethe Andes,Andes, thethe southern hemisphere orogeny is caused by the subduction oftheof the NazcaNazca ocean-ocean- icic plate beneath the South American continental plate.plate. M. RomeroRomerol,1, J. A. StrelinStrelin2'3,2,3, M. R. KaplanKaplan44 Previous studies aimed to constrain lithospheric-scale 11CICTERRA-CONICET—UniversidadCICTERRA-CONICET-Universidad Nacional de CórdobaCÖrdoba (UNC), CórCör-- density and structural heterogeneities in inthe theSouthern Southern doba, Argentina 22InstitutoInstituto AntarticoAntárticoArgentino Argentino(IAA), (IAA),Buenos BuenosAires, Aires,Argentina Argentina Central Andes, in the Puna and the Chaco-Parana basin Central Andes, in the Puna and the Chaco-Paraná basin 33CICTERRA-UniversidadCICTERRA-Universidad Nacional de CórdobaCördoba (UNC), Córdoba,CÖrdoba, ArgenArgen-- (~20(“20 - 27°S). This study focuses on the southernmost segseg-- tina ment of Central Andes (~27°(“27° - 40°S), characterized by a 44Lamont—DohertyLamont-Doherty Earth Observatory, Columbia University, Palisades, strong N-S and E-W variation inin thethe crustalcrustal deformationdeformation NY, United States style and intensity. A recent stratigraphic surveysurvey onon marinemarine terracesterraces inin JamesJames We present a characterization ofof thethe present-daypresent-day statestate Ross Island (JRI), northwestern Antarctic PeninsulaPeninsula (AP),(AP), of the lithosphere,Iithosphere, regarding the density variation and and provides evidences of early Holocene glacial advance. configurationconfiguration of ofthe thesediments, sediments,crust crustand mantle and mantleby by Several profilesprofiles of ofthis thisglacial glacialtransgressive/regressive transgressive/regressive building a lithospheric-scale model consistent with both sequence were performed and sampled for radiocarbonradiocarbon the available geological and seismic data and with the dating (delta(delta R=R= 829829 i± 50),50), yieldingyielding minimumminimum ageage ofof 71007100 observed gravity field.field. AA gravitygravity forwardforward modellingmodelling waswas and maximum age of 7300 calcaI yrs BP for this glacier adad-- carried out using IGMAS+ (Götze and Lahmeyer, 1988; vance. The highest early Holocene marine terrace of JRI Schmidt et al., 2010). The model consists of a conticonti-- reachesreaches up to 17 m.a.s.l, documenting thethe rapidrapid isostaticisostatic nental plate with sediments, a two-layer crust and the uplift that thatproduced producedfalling fallingrelative relativesea Ievel sea level(RSL) (RSL)for for lithosphericIithospheric mantle being subducted by an oceanic plate early Holocene after 80008000 yrsyrs BPBP (Hjort(Hjort etet al.,al., 1997).1997). TheThe (Fig.1).(Fig.1). The configurationconfiguration of ofsediments, sediments,crystalline crystallinecrust crust deglaciation isis notnot onlyonly evidencedevidenced inin terrestrialterrestrial recordsrecords and lithosphericIithospheric mantle was constrained by the geologigeologi-- from Lachman Beach but also inin high resolutionresolution marine-marine- cal and seismic data, while the intracrustal discontinuity core sediment records from Croft Bay, Bay,concluding concludingthat that was modifiedmodified inin orderorder toto reproducereproduce thethe observedobserved grav-grav- the bay was fully deglaciated by 7200 yrs BP (Minzoni ityity field.field. BesidesBesides beingbeing ableable toto assessassess thethe geometrygeometry andand et al., 2015). According to new age interpretation of of composition withinwithin thethe Iithosphere,lithosphere, thethe resultingresultingmodel model southern Potter Cove,Cove, KingKing GeorgeGeorge Island,Island, thethe HoloceneHolocene allowedaIIowed us to evaluate the isostatic statestate ofof thethe crust.crust. postglacial marine transgression initiated before before7650 7650 This is a firstfirst stepstep onon thethe wayway toto estimateestimatethe thethermal thermal yrs BP, and was locallylocaIIy interrupted by a glacier advance and rheological state of the lithosphereIithosphere in the overriding about 200 yrs later, shortly after 72857285 yrsyrs BPBP (Strelin(Strelin etet plate to further investigate thethe Iinklink betweenbetween itsits composi-composi- al., 2014a). Combining evidence from isolation basins basins tional, thermalthermal andand rheologicalrheological heterogeneitiesheterogeneitieswith withthe the and raised beaches, a new RSL curve was reconstructreconstruct-- geometry of the subducting plateplate andand thethe deformationdeformation ed for Fildes Peninsula, which fell after 75007500 yrsyrs BPBP asas style. a consequence of isostatic upliftupliftin inresponse responseto toregional regional This project is supported by the International ResearchResearch deglaciation. However,However, aa temporarytemporary pausepause inin glacialglacial iso-iso- Training Group StRATEGy. static reboundrebound waswas foundfound aroundaround 72007200 yrsyrs BPBP indicatingindicatinga a glacial advance close for this site (Watcham et al., 2011). Evidences for a less extended early Holocene glacier adad-- ABSTRACTS 77 vance were also detected in PenínsulaPenI'nsula Herminita and in gray fine grainedgrained sandstonessandstones oror greywackesgreywackes ofof thethe KayraKayra Agassiz Este Valley, in Patagonia, which can be related Formation. TheThe mainmain controlcontrol forfor thethe oreore depositiondepositionis isa a with glacial advances in New Zealand for the same age locallocal fault, whose fault plain isis „carpeted“ by copper sulsul-- (Strelin(Strelin et. al, 2014b). These robustrobust evidences, make on-on— fides.fides landland stratigraphic recordsrecords fromfrom JamesJames RossRoss IslandIsland anan im-im- The occurrence of the copper ores in a green reducing portant tool to complement other geochronology methmeth-- horizon intercalated in the red bed sequence, the prespres-- ods in order to have a broader perspective onon pastpast iceice ence of organic matter inin intersticesintersticesbetween betweenthe thehypo- hypo- sheet dynamics; not only in Antarctica, butbut alsoalso inin otherother gene sulfides, and andthe thesulfur sulfurcomposition compositionof the ofcop- thecop- high latitude regions.regions. per sulfides (634S(δ34S valuesvalues betweenbetween -16.9-16.9 andand -12.4%o-12.4‰ vsvs VCDT) pointing toto bacterialbacterial sulfatesulfate reduction,reduction,are arestrong strong \h\.1“; .._ . ‚ . _ :*’\l"‘ '‚0 '1 '35? 30' f3. arguments to propose that mineralization waswas causedcaused byby b F, ' Cape Lachman copper-bearing oxidizing saline basinal fluidsfluids that thatpre- pre- h!" „L J»- cipitate copper sulfides whenwhen theythey meetmeet reducedreduced sulfursulfur W inin an organic matter-richmatter—rich horizon.horizon. . an 96.3“" an .. p. _ v. A local fault and other regional structures as the „Falla

'— . h! . ' 't .L '. 3'." " ß" ü“ i Tambomachay“Tambomachay” could have acted as feeders for oxidizing The Platze ‘il basinal copper-bearing fluidsﬂuids that thatprecipitated precipitatedcopper copper sulfidessulﬁdes inin reducedreduced horizonshorizons ofof thethe KayraKayra Formation.Formation.Flu- Flu- . _ ; „ .. ... ‚. idid migration waswas probablyprobably drivendriven byby tectonically-inducedtectonically-induced - . _1- - ._ topography gradient.

| f L. in z . ”3* {1% . _ References Carlotto V.‚V., GilGil W.,W., CärdenasCárdenas J.J. && ChavezChávez R.R. (1996).(1996). GeologiaGeología dede loslos James R5" s.- lgland cuadránguloscuadrangulos de Urubamba y Calca: INGEMMET.INGEMMET. BolBoI N° 65. Serie A. 247 p. Carlotto V.‚V., CärdenasCárdenas J.J. && CarlierCarlier G.G. (2011).(2011). GeologI’aGeología deldel cuadrangulocuadrángulo de Cuzco. INGEMMET. BoletínBoletl’n N°N° 138.138. SerieSerie A.A. 255255 p.p. Bacterially reduced sulfur in organic-rich Rosas S., FontbotéFontbote L., Salcedo C., Robles M., Vallance J.,J.‚ SáezSäez J. & facies of early Eocene red-bedsred-beds (Cuzco region, Spangenberg J. (2019). Copper hosted in red beds at the TambomTambom—- achay deposit (Cuzco, Peru), trapped by bacterially reduced sulfur Peru) as trap for copper during migration ofof during migration ofof BasinalBasinal Fluids.Fluids. SME2019,SME2019, extendedextended abstracts.abstracts. basinal fluidsfluids S. RosasRosas11 Paleomagnetism of MiddIe-Late Jurassic 11PontiPontificalfical Catholic CatholicUniversity Universityof ofPeru, Peru,Geological GeologicalEngineering, Engineering,Lima, Lima, Paleomagnetism of Middle-Late Jurassic Peru BahíaBahl'a Laura Group (Patagonia, southern Argentina) The Tambomachay ore deposit (13°28‘36.78“S,(13°28’36.78”S‚ 1 1 1 71°57‘35.98“W,71°57’35.98”W, about 6 km to the north of the town V. Ruiz GonzálezGonzälezl,, C. G. PuigdomenechPuigdomenechl,, E. M. RendaRendal,, B. of Cuzco - Peru) consists of Cu hosted in the upper part BoltshauserBoltshauserz,2, C. B. ZaffaranaZaffaranaz,2, H. VizánVizan11 of the Kayra Formation (Lower(Lower Eocene),Eocene), thethe oldestoldest unitunit 11IGeBAIGeBA (UBA-CONICET),(UBA-CONICET), Department of Earth Sciences, Ciudad insideinside the Early Eocene –— Early Oligocene red-bedred-bed sese-- AutónomaAutönoma de Buenos Aires, Argentina 22IIPGIIPG (UNRN-CONICET),(UNRN-CONICET), General Roca, Argentina quence known as San JerónimoJeronimo Group (Carlotto etet al.,al., 1996, 2011), that overlies Cambrian — – Paleocene sedisedi-- InIn the present work, the resultsresults of the paleomagnetic mentary rocks and is interpreted to be deposited in a fluflu-- analysis of the Chon Aike and La Matilde formations, formations, vial environment in a foreland basin of the Western CorCor-- which make up the BahíaBahl’a Laura Group, are shown. These dillera of the Central Andes (Carlotto etet al.,al., 2011).2011). TheThe units are assigned a Middle-Late Jurassic age (Pankhurst Kayra Formation consists of red arkosic sandstones, dis- Kayra Formation consists of red arkosic sandstones, dis- et al., 2000, Feraud et al., 1999). Because both units are playing cross-bedding in places, with some intercalations mainly composed of tuffs, ignimbrites,ignimbrites, andand rhyoliticrhyoliticla- la- of greenish gray finefine grainedgrained sandstonessandstones oror greywackes.greywackes. vas, it is very difficultdifficult to toestablish establisha astratigraphy stratigraphyof ofboth, both, This twofold lithology corresponds to different sedimen-sedimen- and in some places, they seem to be interdigitated and tary domains of an alluvial system. The red sandstones tary domains of an alluvial system. The red sandstones inin others, itit seems that one underlies the other. Unlike representrepresent permeable fluvialfluvial sandsand barsbars andand channels,channels, al-al- the ignimbritesignimbrites of the Chon Aike formation, thethe tuffstuffsand and lowinglowing post depositional fluidfluidcirculation. circulation.The Thegreenish greenish ignimbritesignimbrites of the LaLa Matilde FormationFormationshow showa acertain certain gray greywackes rather stand for floodingflooding plainplain organic—organic- degree of inclination inin thethe studiedstudied outcrops.outcrops. ThisThis isis con-con- richrich deposits in a swamp-like environment that preventprevent-- firmed byby itsits magneticmagneticfabric fabricby bystudying studyingthe theAnisotropy Anisotropy ed surface oxidation (Rosas(Rosas etet al.,al., 2019).2019). of Magnetic Susceptibility Susceptibility(AIVIS). (AMS).However, However,the thepaleo- -paleo Bornite, chalcopyrite, chalcocite, covelite, digenite, magnetic directions directionscoincide coincidewith witheach eachother otherwithout without malachite, and chrysocolla occur cementing veinlets,veinlets, in-in- applying any tilt correction, correction,despite despitethe thedifferent differentmag- mag- tergranular pores and other open spaces in the greenish tergranular pores and other open spaces in the greenish netic fabricfabric oror inclinationsinclinationsof ofthe therock rock. .For Forthis thisreason, reason, 78 ABSTRACTS itit isis interpretedinterpreted that the ignimbritesignimbrites of the LaLa MatildeMatiIde deposits assigned to the Sarmiento Group (Oligocene). Formation werewere adaptedadapted toto thethe terrainterrain andand toto thethe mor-mor- This sequence is >70 m thick and constitutes prominentprominent phology prior to depositing, because,because, ifif aa tilttiltcorrection correction cliff coveredcovered byby aa newnew episodeepisode ofof basalticbasalticIavas lavasthat thatforms forms isis applied, the paleomagnetic directions directionsare aredispersed dispersed a plateau which frames the southern sector of the ElEI insteadinstead of grouped. The resultsresults of the paleomagnetic Cain depression. The flows,flows, originatedoriginated inin anan apparatusapparatus study show that the paleomagnetic polepole ofof thethe LaLa Matil-Matil- locatedIocated 13km to the west, are lightIight gray basalts with veve-- de Formation andand thethe paleomagneticpaleomagneticpole poleof ofthe theChon Chon sicular roofs and average thickness of 5 m. Rocks are porpor-- Aike Formation are areequivalents. equivalents.Both Bothpaleomagnetic paleomagnetic phyric traquibasalts of fluidalfluidal texture,texture, withwith plagioclase,plagioclase, poles pass a reversal test, in to validate their statistical titaniferous augite, augite,iddingsitized iddingsitizedolivine olivineand interstitial and interstitial parameters. Therefore, both formations werewere formedformed inin alkaliaIkaIi feldspar. This rock, yielded a whole rock K/Ar age a similar time intervalinterval (150-160(150-160 Ma)Ma) andand diddid notnot undergoundergo of 18.7 ±i 0.4 Ma, that represents the youngest age of the vertical rotationsrotationsof oftectonic tectonicblocks. blocks.This Thisshows showsthat thatthe the BNVC effusions.Therefore, the theradiometric radiometricdating datingcon- con- Deseado Massif already made Patagonia as it is today, strains the BNVC activity betweenbetween thethe EoceneEocene (Ypresian)(Ypresian) since at leastleast the MiddleMiddIe Jurassic that it was constituted and the Miocene (Burdigalian). Although these ages corcor-- as a whole by then. respondrespond to a very restrictedrestricted area of the PMSC, the corcor-- relationreIation withwith regionalregional eventsevents aIIowsallows toto extrapolateextrapolate thisthis References time rangerange toto aa widewide areaarea ofof thethe westernwestern sectorsector ofof thisthis Feraud, G., Alric,AIric, V., Fornari, M., Bertrand, H., Haller,HaIIer, M., 1999. Province. The Palaeogene volcanism is represented by 40Ar/39Ar dating ofof thethe JurassicJurassic volcanicvolcanic provinceprovince ofof Patagonia:Patagonia: mi-mi- several necks ofofthe the Cerro Cortado Fm., ElEI Buitre Fm. and grating magmatismmagmatismrelated relatedto toGondwana Gondwanabreak-up break-upand andsubduction. subduction. equivalents, which have been correlated with the basalt Earth Planet. Sci. Lett. 172,172, 83—96.83–96. Pankhurst, R.J.,R.J.‚ Riley, T.R.,T.R.‚ Fanning, C.M., Kelley, S.P.,S.P.‚ 2000. Episodic SiSi-- outcrops of Basalto Pilquiniyeu in the west of the PMSC. licicIicic Volcanism inin Patagonia and the Antarctic Peninsula:Peninsula: ChronologyChronology The oldest basalt in the studied profileprofile correlatescorrelates withwith of Magmatism AssociatedAssociated withwith thethe Break—upBreak-up ofof Gondwana.Gondwana. J.J. Petrol.Petrol. this magmatism that thatextends extendsbetween betweenthe thePaleocene Paleocene and the Eocene with a climax in the Early Eocene. In adad-- dition, thethe mostmost modernmodern eventsevents correspondcorrespond toto episodesepisodes SomúnSomün CuráCurä Magmatic ProvinceProvince (Argentina).(Argentina). linkedIinked to largeIarge bimodal complexes such as Barril Niyeu, Lava-pyroclastic sequencesequence southernsouthern ofof EIEl CainCain Apas, Talagapa and Pire Mahuida (Fig. 1 a). village: Age and composition. Sponsored by UBACYT 20020170100554BA & PIPPIP-- 11220130100579CO F. SalaniSalanil,1, M. RemesalRemesall,1, M. E. CerredoCerredol,1, C. ParicaParica22 11UniversityUniversity of Buenos Aires, Geology, Buenos Aires, Argentina 22UniversityUniversity of San Martin, InstituteInstitutefor forResearch Researchand andEnvironmental Environmental Engineering, San Martín,Martin, ArgentinaArgentina

The volcanic sequence of the SomúnSomün CuráCura Magmatic Province (SCMP) occupies largeIarge areas in the south of RíoRio

II __ a _ _ - Negro Province and north of Chubut Province, Argentina. __-' . i--{}_‚.‚ _ ‚4 - i I: ‘ . unmL-mmJ LIEHJEMII: CWFLEII' '- I . SCMP encompass a great variety of basaltic volcanic as- 1' SCMP encompass a great variety of basaltic volcanic as- | E-fl'f-l H -.'I.-J .2 F‘ 'I:'I -'-1.'l ‘II. I:|.': .:. :'..=.'1:1..=I|‘\E| -: ‚I’I.|_-._|n.I ‘ - " _ sociations inin thethe northnorth ofof extrandeanextrandean Patagonia.Patagonia. FI:|'| -.I;. _:-::'|:;-!;_-.-.--:. The western region ofofthe the SCMP is characterized by the Fig. 11:: a) Location mapmap showingshowing thethe SomünSomún CuraCurá plateauplateau andand thethe stratigraphic complexitycomplexity includingincluding aa Iargelarge timetimerange, range,a a bimodal complexes. The studied area is represented by an orange recurrentrecurrent magmatism andand severalseveral petrogeneticpetrogeneticIineages. lineages. rectangle.rectangle. b) Close up view of the ElEI CaínCain area. At leftIeft sectorsector ofof InIn the north of the Barril Niyeu Volcanic Complex (BNVC)(BNVC) Google Earth Image is locatedIocated the volcanic center which originated (Fig.(Fig. 11 a; b), one of the most importantimportant bimodal assoasso-- the basaltic flows.flows.The Therectangle rectangleencloses enclosesthe theoutcrops outcropsof ofthe thestud- stud- iedied sequence. ciations ofof thethe PMSC,PMSC, andand toto thethe southsouth ofof EIEl CainCain village,village, a sequence of lavaIava and pyroclastic rocksrocks outcropsoutcrops (Fig.(Fig. 1 b). These exposures record two basaltic eventsevents sepa-sepa- ratedrated by a time gap,gap, currentlycurrently evaluatedevaluated onIyonly basedbased onon Lithium sources in northern Puna salars, stratigraphic relationships.relationships.Further Furtherestimations estimationsare arepro-- pro Argentina. EvidenceEvidence fromfrom LiLi andand SrSr isotopeisotope vided by newly acquired radiometric dating, whichwhich areare compositions. the focus of this contribution. 1 2 2 1 The oldest basaltic event event is isrepresented representedby bya fine a fine C. SarchiSarchil,, A. MeixnerMeixnerz,, F. LucassenLucassenz,, P. J. CaffeCaffel,, R. BecBec-- 3 2 grained rock of intersertal texture, with plagioclase in a chiochio3,, S. A. KasemannKasemann2 1 fluidalfluidal arrangement,arrangement, olivine,olivine, clinopyroxeneclinopyroxene andand opaqueopaque 1INECOA—IDGyM,INECOA-IDGyM, San salvador de Jujuy, Argentina 22MARUM,MARUM, Bremen, Germany minerals,mineraIs, and significantsignificant zeoIitization.zeolitization.A wholeA wholerock rockK/Ar K/Ar 33INENCO-UNSa,INENCO-UNSa, Salta, Argentina age of basalt flowflow ofof thisthis unitunit yieldedyielded 5353 i-± 22 Ma.Ma. Rest-Rest- inging over this basalt there are fallfaII deposits and pyroclastic flowsflows withwith discontinuousdiscontinuousintercalations intercalationsof ofpyro-epiclastic pyro-epiclastic ABSTRACTS 79

The „Lithium-Triangle“„Lithium-Triangle” region is locatedIocated in the high Puna- The role of mass wasting inin glacialglacial forelandsforelands Altiplano PlateauPlateau ofof thethe centralcentral AndesAndes (27°(27° toto 21°21° S).S). InIn of the Andes this area, high-altitude endorheicendorheic basinsbasins (salars)(salars) containcontain 1 1 2 2,3 the richestrichest known brine resourcesresources of the LiLi in the world. E. SchönfeldtSchönfeldtl,, O. KorupKorupl,, D. WinocurWinocurz,, T. PánekPanekz'3 InIn this work, we study Jama and MucarIVIucar salars (north(north-- 11UniversityUniversity of Potsdam, Institute ofof Geoscience,Geoscience, Potsdam,Potsdam, GermanyGermany 2 ern Puna). They developed within the same basin, sepasepa-- 2University,University, Geology, Buenos Aires, Argentina 33UniversityUniversity of Ostrava, Physical Geography and Geoecology , Ostrava, ratedrated by a rangerange of Ordovician sedimentary rocks.rocks. With Czech Republic the aim of understanding the source of Li,Li, we obtained Li and Sr isotopic ratios fromfrom rocks,rocks, brines,brines, saltssalts andand riverriver Large segments of the Andean foreland have been rere-- waters. Li isotope compositions rereflectflect low lowtemperature temperature peatedly shaped by Quaternary glaciations. TheThe manymany di-di- fractionationprocesses, processes,during duringweathering weatheringor orhydrother- hydrother- agnostic landformslandforms includeinclude largelarge glacialglacial Iakes,lakes, staircasesstaircases mal leachingIeaching of the source rocks, where Sr isotope ratios of moraine ridges, and extensive outwash plains, and reportreport contrasting signatures signaturesof ofpotential potentialsource sourcerocks rocks have inspired generations of ofQuaternary Quaternarygeologists geologiststo to e.g. Cenozoic volcanic and Ordovician sedimentary rocks. reconstructreconstruct the processes, magnitude, and timing ofof iceice Water and brine samples show positive 67Li δ7Livalues values build-upbuiId-up and decay along the mountain front, adding to between +3 and +15 ‰%o and 87Sr/86Sr values between a reference chronology of Southern hemisphere glaciaglacia-- 0.709 and 0.712, while the Li concentrations areare betweenbetween tions. WhatWhat onlyonly aa fewfew ofof thesethese studiesstudies havehave noticednoticedare are 0.03 and 245 mg/L. Salt samples also show positive 67Liδ7Li several hundreds of very largelarge (>>106m3) mass-wasting values but in a narrower range. Their 87Sr/86Sr are deposits that fringe the Andean foreland. ManyIVIany of these mostly in the same range as in the fluidfluid samples.samples. TheThe LiLi debris mounds intersect withWith many well-datedweII—dated moraine concentrations areare higherhigher inin thethe salts,salts, betweenbetween 471471 andand ridgesridges or former meltwater-lakemeltwater-Iake shorelines and offer ex-ex- 1253 µg/g.ug/g. Clay and sand samples show negative 67Li δ7Li citing opportunitiesopportunitiesof ofexploring exploringthe thehitherto hithertoIargely largelyun- un- values between -9 and -6 ‰%o and an average 87Sr/86Sr known roleroIe of mass wasting inin thethe glacialglacial forelandsforelands oftheof the of 0.711. The Li concentration in inClay clayand andsand, sand,varies varies Andes. MoreIVIore than 283 large rotational slidesslides andand laterallateral between 40 and 156 µg/g,pg/g, being higher in the clay. CeCe-- spreads followed by debris slides, earthflows,earthflows, rotationalrotational nozoic volcanic rocks show δ7Liö7Li between -5 and +1 ‰,%o, and translational rockslides,rockslides, complexcomplex slidesslides andand fewfew largelarge 87Sr/86Sr between 0.709 and 0.715 and average Li concon-- rockrock avalanchesavaIanches detached some 164 ±i 56 km3 of matemate-- centrations ofof 3939 ug/g.µg/g. PalaeozoicPalaeozoic basementbasement rocksrocks havehave rialrial along the former Lago Buenos Aires and LagoLago PuyPuy-- a higher average Li concentration, 67Liδ7Li betweenbetween -5-5 andand erredónerredon glacier lobesIobes and lakes in Argentina. InIn thisthis studystudy +6 ‰%o and 87Sr/86Sr between 0.717 and 0.914. we focus on a smallsmaIl area along the western side of the volcanic plateau MesetaIVIeseta del Lago Buenos Aires and prespres-- ent a detailed study showing periodic peat slides and earthflowsearthflows onon toptop ofof anan reactivatedreactivatedrotational rotationalIandslide. landslide.

Dynamic interaction ofof thethe initialinitialimpact impact ‘ {Im .1'h:l und: melt sheet during peak-ringpeak—ring formation ofof thethe “M.""m I i -|i|in1l Chicxulub Impact Crater, México.Mexico.

1 1 Figure 1 shows the data presented above. During F. SchulteSchultel,, U. RillerRiller1 1 weathering a preferential fractionation fractionationof 7Li of into 7Li the into the 1UniversitätUniversität Hamburg, Hamburg, Germany solute occurs, leavingIeaving a silicate phase enriched in 6Li (sa(sa-- IODP-ICDPIODP-ICDP Expedition 364 364drilled drilledinto intothe thepeak-ring peak-ringof of larIar sediments with light,light, negative 67Li).δ7Li). TheThe differencedifferencein in the 66 Ma,IVIa, 200 km-Økm-(Z) Chicxulub impact crater, México.IVIexico. Li concentrations betweenbetween water,water, brinebrine andand saltsalt isis relatedrelated Coring started at 500 meters below sea floorfloor (mbsf)(mbsf) andand to evaporation processes.processes. TheThe widewide ö7Liδ7Li rangerange displayeddisplayed includesincludes ~120“120 m post-impact sedimentary rocksrocks above a by the runoff waterwater isis Iikelikely duedue toto thethe differentdifferentextent extent ~N 140 m thick suevite and impact melt rock unit. Beneath of Li fractionationin inthe theweathering weatheringof ofthe thesource sourcerocks. rocks. 575 m pervasively shocked granitoid basement rocks, inin-- The δ7Li67Li is not substantially fractionatedfractionatedbetween betweenbrine brine tersected by pre-impact dykes and suevite bodies, make and salt, i.e. halite crystallization. TheThe 87Sr/86Sr87Sr/86Sr ratiosratios up the drill core to its finalfinal depthdepth ofof 13341334 mbsf.mbsf. BasedBased onon of brines/water and salts, that overlap with the range of visual inspection ofof lineline scans,scans, microstructuralmicrostructural andand elec-elec- Cenozoic volcanic rocks and indicate an important concon-- tron microprobe analyses, we focus on the emplacement tribution ofof thethe Iatterlatterto tothe therunoffs runoffscollected collectedby bythese these processes of a layered impact melt rock section onon toptop endorheic basins. The fluxflux fromfrom sedimentarysedimentary OrdovicianOrdovician of the basement rocks (Fig. 1) to examine the individual basement rocks seem to be of minor importance. melt dynamics during solidification,solidification, deposition depositionof the of the overlying suevite unit and ongoing peak-ring settling. 80 ABSTRACTS

A) ath ikmn . . . 5J ‚a De “1ts . ‚ UN|T peak-ringpeak-rintg> settlingsettlinig> at at a ashear shearinterface interfacebetween betweenimpact impact - P122. x’ p *"‘-r - sammenls" J melt at the base, superimposed on basement elevatingelevatintg> Sueuüe outward from the crater centre and water-saturated tartar-- ELB ' ' '‚ 712.84 get material at the top slumping into the crater. —' ' 7 Subunit fil ‚_ .;. _ impact . ‚‘_..r. 25-15: '.;. breccia 'i'ISEE . ÜJ 'i'sn-T ": __r" Fig. 11:: (A)(A) Lithology of Exp. 364 drill core, slightly modifiedmodified from:from: [1][1] Morgan J. V. et al. 2016. The formation ofof peakpeak ringsrings inin Iargelarge Impa ct melt #17:a Subunit3 rock — " —l_‚.-„... impact craters. Science 3542878-882. (B) Cross section of the Iayered .-':" 5.. . -- impact craters. Science 354:878-882. (B) Cross section of the layered "W; "*1;- 721.21 impact-meltimpact-melt rockrock subunits. Ü. CD - _‚Ffll'iil: '*. 'basqment- ‘.

_lf— -""-|l'l_::: II

Settinn rock 0.9 Upper plate stress fieldﬁeld inin thethe northernnorthern ChileChile

SuhunitE melt forearc from earthquake source mechanisms lmpacl .. breccia ' Impact 1 1 1 1 .‚ dikes B. SchurrSchurrl,, L.L. LehmannLehmannl,, C. SipplSippl1‚, W. BlochBloch1 “a 737.50 1 lmpacr 1DeutschesDeutsches GeoForschungsZentrum GFZ, Dynamik der Lithosphäre, _ _ melt rock Potsdam, Germany 1_1-'__.-:"‘"*= dlkEB Pre-impact ff"? '_ Suhunül dikes Subduction zonezone forearcsforearcs deformdeform transientlytransiently andand perma-perma- .. ' 759.21 nently due to the frictional coupling with the converging> .' _ Over— nently due to the frictional coupling with the converging '.— .-;-"-.-:-' thrusted N lowerIower plate. Transient stresses are mostly the elastic re-re- . _ T5, lmpact '25??? melt rock Basement sponse to the spatio-temporally variablevariable plateplate couplinrg>coupling Laä#*‚_ _’ _‘j m through the seismic cycle. Long-termLong—term deformation dede- pends e.g.,e.g.‚ on the plate convergence geometry, where The melt rock can be divided into four subunits, which obliqueness or change in obliqueness play important are from bottom to to top: top: 1) 1)A AN21.5 ~21.5m thick m thicksubunit subunitis is roles.roles. Here we use the IntegratedIntegrated Plate Boundary ObOb-- composed of a fragment poor, aphanitic silicate silicatemelt melt servatory Chile (IPOC) and additional temporaltemporal networksnetworks rocks.rocks. Besides the homogeneity of the melt rockrock comcom-- to determine source mechanisms for upper plate earthearth-- position, the thecharacteristic characteristicfeature featureare macroscopically are macroscopically quakes in the northern Chile subduction zone.zone. WeWe findfind visible mottled textures textures with withjigsaw jigsawgeometry. geometry.These These that earthquakes in the South American crust under the observations indicate, indicate,that thatthe themelt meltrock rockrepresents representsa a sea and under the Coastal Cordillera show a remarkablyremarkably quenched and auto-brecciated remnant of the initial homogenous north-south compressional stress field.field. homogeneous melt sheet, which is consistent with pepe-- Earthquake fault mechanisms are dominated by east- trographic analyses from previous drilldriII cores. 2) A ~16N16 west striking thrusts. Further inland where the lowerIower m thick subunit is made up of interlayered silicate and plate becomes uncoupled, the stress fieldfield isis moremore variedvaried carbonate rocks displaying convoluted centimetre-scale with direction east-west east-westto tosoutheast-northwest southeast-northwestdomi- domi- folds. The predominantly aphanitic silicate silicatemelt meltrocks rocks nating. The Thepeculiar peculiarstress stressregime regimealmost almostperpendicu- perpendicu- are similar to the lowermostIowermost subunit. The rocks are larIar to plate convergence direction maymay bebe explainedexplained byby composed of secondary clay- and sparitic calcite.calcite. Cusp-Cusp- a change in subduction obliquenessobliqueness duedue toto thethe concaveconcave and-lobeand-Iobe geometry indicates that the silicate phase was shape of the plate margin. more viscous than the carbonate phase during folding and solidification.solidification. 3) 3)A AN ~6 6m mthick thicksubunit subunitis iscomposed composed of a melt breccia, hosting subangularsubangular fragmentsfragments ofof sili-sili- Hydrogeochemistry and origin of elevated cate rocks. The groundmass is similar in composition toto the carbonate rocksrocks below, but shows littlelittle evidenceevidence forfor concentrations ofof fluoride,fluoride,arsenic arsenicand and ductile flow.flow.4) 4)A AN ~3 3m mthick thicksubunit subunitis isseparated separateddis- dis- uranium in the area of the San Antonio eleI cordantly from the overlyingoverlying> suevite and is composed of Grande mine, Chihuahua / Mexico ~N 0.5 cm thick target rock fragments showingShowing> resorbed D. SchwertfegerSchwertfeger1‚1, A. Cardona BenavidesBenavidesz,2, S. Alonso TorTor-- margins, set in a brecciated calcareous matrix. resresz‚2, A. BanningBanning11 The consolidation of ofthe thesilicate silicateand andcarbonate carbonaterock rock 11Ruhr-UniversitätRuhr-Universität Bochum, Hydrogeology Department, Bochum, structure above a homogeneous melt rockrock points to Germany modificationmodification or ormingling minglingof ofthe theinitial initialmelt meltsheet sheetwith withan an 22UniversidadUniversidad AutónomaAutönoma de San Luis Potosí,Potosi, Earth Sciences, San Luis external source from the top downward. This is consisconsis-- Potosí,Potosi, Mexico tent with an observed thermal gradient, evident by the upward directed decrease in viscous flowflow andand onsetonset ofof The dissolved trace element concentrations inin ground-ground- brittle deformation deformationin inthe thesilicate silicaterocks. rocks.The structural The structural water and surface water in the study area around the characteristics ofof thethe meltmelt rocksrocks pointpoint toto quenchintg>quenching byby mine exceed the German Drinking Water Regulations the entrained phase from the top along a perturbed of 1.5 mg/l for fluoride,fluoride, 1010 ppbppb forfor arsenicarsenic andand 1010 ppbppb interface.interface. The layersIayers appear to have developed during for uranium inin 72.8 %,%‚ 64.0 % and 58.4 % of all samples. ABSTRACTS 81

The groundwater, as the region‘sregion’s most important drinkdrink-- Structure of and dynamic processes within inging water source, isis threatened by the elevated concenconcen-- the crust of Northern Chile (IPOC area) based trations and andto toaddress addressthe thequestion questionof the oforigin the originand and on ambient seismic noise correlations andand the underlying mobilisation andand transporttransport processes,processes, thethe element distributions ofof 125125 waterwater samplessamples werewere exam-exam- repeating EarthquakesEarthquakes inedined and evaluated with regardregard to their main and trace C. Sens-SchönfelderSens-Schönfelderl,1, B. HeitHeit1,1, R. GreenGreenl,1, F. TilmannTilmann11 elements. 1lGFZ-Potsdam‚GFZ-Potsdam, Geophysics, Potsdam, Germany The incompatible elementselements accumulatedaccumulated inin thethe coursecourse of magma differentiationin inthe thepredominantly predominantlyacidic acidicig- ig- Active tectonicstectonics inin NorthernNorthern ChileChile inin conjunctionconjunctionwith withthe the neous rocks of the investigated area areaand andsolution solutionpro- pro- exceptional seismic seismicand andgeodetic geodeticinstrumentation instrumentationpro-- pro cesses depending on pH value, temperature and redox vides a unique opportunity to study the structural and potential werewere identiidentifiedfied as asthe themain mainsource sourcefor forthe thein- in- dynamic circumstances of large subduction zonezone earth-earth- creased concentrations inin thethe waterswaters aroundaround thethe mine.mine. quakes. We focus on the 2014 earthquake sequence that InIn addition, thethe numerousnumerous mineralisationmineralisationzones zonesand andthe the culminated in the Mw 8.1 IquiqueIquique earthquake on April carbonates, such as limestones,Iimestones, that occur frequently in 1st.15t.This This sequence includes a rich foreshock sequence a this regionregion representrepresent further potential sources.sources. TheThe mo-mo- largeIarge mainshock followed by numerous aftershocks. bility ofofthe the trace elements fluoridefluoride andand arsenicarsenic seemsseems toto To establish the structural background in which we inin-- be mainly controlled by the pH value. Alkaline pH values vestigate thethe dynamicdynamic processesprocesses thatthat proceed,proceed, accompa-accompa- cause higher concentrations. EspeciallyEspecially forfor thethe mobilitymobility ny and follow major earthquakes we perform an ambient of uranium the water temperature seems to be a decisive noise tomography of the shallow crust in the area of the factor. However, the dissolved fluoridefluoride concentrationconcentrationin in IPOCIPOC network. We use a hybrid approach comprising of the water is also increased by higher temperatures. FluoFluo-- a linearized inversion of group velocity curves for group riterite precipitation, onon thethe otherother hand,hand, doesdoes notnot seemseem toto velocity maps and a Markov chain Monte-Carlo inversion be a decisive control mechanism. of local 1D dispersion curves obtained from the group The San Antonio mine increases the dissolved trace velocity maps for the finalfinal 3D3D s-velocitys-velocity structure.structure. OurOur element concentrations in inthe thewaters watersby bycreating creatinglarg- larg- model contains the top 10km of the crust with a lateral er contact areas with the acidic igneous rocks and new resolutionresolution ofof aboutabout 30km30km wherewhere thethe firstfirstorder orderfeatures features pathways. The constantly decreasingdecreasintg> groundwater levelIevel are two shallow N-S striking bands of high and low veve-- will leadIead to further problems in the future. It is likelyIikely that locitylocity anomalies along the costal cordillera and the cencen-- more and more deep water will be pumped, which could tral depression, respectively.respectively. TheThe lowlow velocityvelocity structurestructure further increaseincrease the content of dissolved trace elements. along the Atacama Bench is segmented with pronounced InIn order to ensure the long-termlong-term security of the drinking minima located about 19.5˚S,19.5°S‚ 20.8˚S20.8°S and 22˚S.22°S. water supply in the study area and to protect the populapopula-- To investigate thethe expressionexpression ofof dynamicdynamic processesprocesses inin tion fromfrom thethe potentiallypotentiallyhuman-toxicological human-toxicologicaltrace traceele- ele- the seismic velocities wewe followfollow twotwo strategies.strategies. OnOn thethe ment concentrations, effortseffortsshould shouldbe bemade madeto toreduce reduce one hand we use records of the ambient seismic fieldfield the dissolved contents. A possible precipitation ofof fluo-fluo- for continuous monitoringmonitoring ofof thethe velocityvelocity variations.variations.This This rideride via the mineral fluoritefluorite couldcould bebe considered.considered. revealedrevealed the responseresponse of the shallow subsurface in the vicinity of the seismic stations toto earthquakeearthquake shakingshaking andand subsequent healing as well as fluctuationsfluctuations of oftempera- tempera- Mid-Tertiary ture and variations of tidal forces from sun and moon. E MInnralIsalian ture and variations of tidal forces from sun and moon. E Folslte On the other hand, using repeating earthquakesearthquakes thatthat E Diabase Sllls occurred in more than 500 distinct Clustersclusters containintg>containing upup Early Tertiary Volcanics to 50 events we investigateinvestigate Signalssignals thatthat havehave sensitivitysensitivity E Conglumerala to medium changes close to the source volume of the Cretaceous EI Finh‘w Formation events. Observed velocity changes with amplitudes of E Benigno Formaliun 0.001% are tiny butbut oftenoftenaccurately accuratelyobservable observabledue dueto to [E Lagrima Formation EI undinnrnntiatnd the high coherency of the repeatingrepeating earthquakeearthquake Signals.signals. L—.—| ' oralacenug ilü in"! t “ich: Earthquake scaling models applied to Reference seismicity analysis in Chile Megaw,IVIegaw, P. K. (1990). Geology and geochemistry of the Santa Eulalia C. Siegel1‚1 J. Camposl‚1 B. Derodel,1 P. Toledo22 mining district, Chihuahua, Mexico. 461 p., The University of AriAri-- C. Siegel , J. Campos , B. Derode , P. Toledo zona. 11UniversidadUniversidad de Chile, Departamento de Geofísica,Geofi’sica, Santiago,Santiago,Chile Chile 22UniversidadUniversidad Adolfo Ibanez, iUAI Mining Center, Santiago, ChileChile

InIn order to analyze the huge amount of seismic data from Chile seismic region gathered by new instruments dede-- ployment and due to large events in the last decade, we 82 ABSTRACTS studied the scaling properties ofof Iocallocal seismicseismic catalogs.catalogs. part of the slab, these abruptly change into a 25-3025—30 km We use the scope of the UnifiedUnified ScalingScaling LawLaw forfor Earth-Earth- thick, homogeneously seismogenic volume at a depth quakes (USLE, Bak et alaI 2002). It states that the density of ~80-100“80-100 km. Seismicity rate and moment release sigsig-- probability function of ofthe theinter-occurrence inter-occurrencetimes, times,as as nificantlynificantly increaseincrease inin thisthis depthdepth interval.interval. InIn orderorder toto un-un- they are counted in hierarchical cells of magnitude and derstand which processes evoke this configurationconfiguration and and linearlinear dimension, have a scaling functional form.form. TheThe b-b- what distinguishes thethe NorthernNorthern ChileChile subductionsubductionzone zone value of Gutemberg-Richter lawIaw and the fractal dimendimen-- from more conventional subductionsubductionzone zonesettings settings(e.g. (e.g. sion of the distribution ofof earthquakeearthquake epicentersepicenters appearappear Japan), we performed a detailed seismological investigainvestiga-- as critical indices. indices.We’ve We‘veshown shownthat thatin ina Iocal a localseismic seismic tion ofof slabslab seismicityseismicity inin NorthernNorthern ChileChile usingusing datadata fromfrom catalog calculated with body waves (Derode et al 2019) the IPOCIPOC permanent network. We determined >600 this lawIaw hold. A parameter estimationis ismade madeusing usinga a moment tensors of intraslab earthquakes, processed box-counting algorithmalgorithm (Nekrasova(Nekrasova etet alal 2015).2015). ThisThis pa-pa- and evaluated location uncertaintiesuncertaintiesfor for8 8years yearsof ofhigh- high- rameterrameter estimationis isthen thenused usedto tocharacterize characterizechilean chilean resolutionresolution earthquakeearthquake hypocenterhypocenter data,data, andand performedperformed seismic regions. statisticalanalysis analysisofthe of thedifferent differentseismicity seismicitypopulations. populations. We have developed a conceptual model from complex We observe that earthquakes both in the highly active critical systemssystems inin whichwhich thisthis analysisanalysis isis framed.framed. TheThe Uni-Uni- cluster and the DSZ above exhibit consistently downdip fiedfied ScalingScaling LawLaw forfor earthquakesearthquakes emergesemerges inin aa simulationsimulation extensive source mechanisms that align of a cellular automaton, in which arrangements of site- with the dip angle and direction ofof thethe slab.slab. ThisThis im-im- blocks coalesce according to their coupling and rupture pliespIies strong slab pull,puII, which is also evident from slab inin cascades to generate seismic events. Emergence arise steepening outlined by hypocenters towards the downdown-- from the geometrical definitiondefinition of ofthe thesystem systemand andthe the dip termination of ofthe thehighly highlyactive activeCluster. cluster.Moreover, Moreover, criticality itit isis posedposed in.in. events in the clusterCluster show a very weak aftershock pro-pro- With this study we put in evidence the necessity of ductivity andand aa highhigh backgroundbackground eventevent rate,rate, whichwhich Ieadsleads having actualized and wellweIl maintained seismic catalogs, to a temporal distribution ofof seismicityseismicity thatthat isis closeclose toto aa that can account for robustrobust parameter estimationsand and purely random process. We findfind thatthat thethe positionpositionof ofthe the can laterIater be used to provide reliable hazard estimation. highly seismogenic volume spatially coincides coincides with: with:1) 1) the disappearance of the velocity contrast between oceoce-- References anic crust and the underlying mantle in receiver function Bak, P., Christensen, K., Danon, L., Scanlon, T. (2002). UnifiedUnified scalingscaling images,images, 2) the transition fromfrom the“coldthe``cold nose“nose‘‘ (i.e.(i.e. thethe lawIaw for earthquakes. Physical Review Letters, 88(17)‚88(17), 178501.178501. stagnant part) to the hot part of the mantle wedge, as Nekrasova A.,A.‚ Kossobokov V,. Parvez IA.,IA.‚ Tao X. (2015) Seismic hazard evidenced by seismic attenuationimages, images,and and3) 3)with withan an and risk assessment based on the unifiedunified scalingscaling Iawlaw forfor earth—earthquakes. Acta Geod. Geophys.,Geophys.‚ 50(1):21–37.50(1):21—37. increaseincrease of the slab dip angle. Based on these differdiffer-- Derode, B., Delouis, B., Campos, J. (2019). Systematic DeterminationDetermination ent pieces of evidence, we speculate that high tensile of Focal Mechanisms over a Wide Magnitude Range: Insights from stresses and heat input from above could leadIead to a sudsud-- the RealReal—Time‐Time FMNEAR Implementation inin ChileChile fromfrom 20152015 toto 2017.2017. den burst of kinetically delayeddelayed metamorphicmetamorphic reactionsreactions Seismological Research Letters, 9090 (3):(3): 1285-1295.1285-1295. there that then enables the observed increased seisseis-- micity rates. Since these reactions havehave overalloverall aa nega-negative volumevolume changechange thatthat Ieadsleads toto slabslab densidensificationfication and and Filling the gap in a double seismic zone: hence further increases slab pull,puII, the spatial patternpatternof of IntraslabIntraslab seismicity in Northern Chile seismicity we observe could result from a runaway-type C. SipplSippll,1, B. SchurrSchurrz,2, T. JohnJohn3,3, S. HainzlHainzl22 process, which would explain its abrupt start and high moment release rates. 11CzechCzech Academy of Sciences, Institute ofof Geophysics,Geophysics, Prague,Prague, CzechCzech moment release rates. RepublicRepubHc 22GFZGFZ Potsdam, Potsdam, Germany 3 3FreieFreie Universitaet Berlin, Berlin, Germany Multistage evolutionevolutionof ofa aNeoproterozoic Neoproterozoic Double seismic zones (DSZs) of intermediate-depth intraintra-- quartz-gold vein mineralization, DomDom slab seismicity are observed in many subduction zoneszones Feliciano orogenic belt, Uruguay around the globe, and have been related to dehydration G. SosaSosal,1, A. Van den KerkhofKerkhofl,1, K. WemmerWemmerl,1, F. PaullierPaullierz,2, reactionsreactions inin thethe downgoingdowngoing crustcrust andand mantlemantle lithosphere.lithosphere. J. SpoturnoSpoturnoz,2, P. OyhantçabalOyhantg;aba|22 These reactions occuroccur at,at, toto firstfirstorder, order,constant constanttemper- temper- 11UniversityUniversity of Göttingen,Geoscience GeoscienceCenter Center— -GZG, GZG,Göttingen, Göttingen,Ger—- Ger atures, which explains the observed linear arrangements atures, which explains the observed linear arrangements many of seismicity that appear to follow isotherms of thermal 22UniversidadUniversidad de la República,Republica, Departament of Geology, Göttingen, models. Uruguay Intermediate-depthIntermediate-depth seismicity inin Northern Chile, however, exhibits a pattern of ofintraslab intraslabseismicity seismicitythat that Along the western margin of the Neoproterozoic Dom substantially deviates deviatesfrom froma aclassical classicalDSZ. DSZ.Whereas Whereas Feliciano BeltBeIt (Uruguay) and its cratonic foreland several two parallel seismicity planes are present inin the updip vein-type gold occurrences and prospects can be found. ABSTRACTS 83

We studied a goldgoId prospect related to quartz veins hosted H. SotoSotol,1, C. SipplSippll,1, B. SchurrSchurrl,1, J. KummerowKummerowl,1, G. AschAschl,1, F. inin dolomitic marblemarble belongingbelonging toto aa PaleoproterozoicPaleoproterozoic plat-plat- TilmannTilmannl,1, D. ComteComtez,2, S. RuizRuizz,2, O. OnckenOncken11 form succession, metamorphosed inin amphibolite facies 11GFZGFZ German Research Centre for Geosciences, Potsdam, BrandenBranden-- at 550-650°C / 4.5-5 kb. The quartz veins are concentratconcentrat-- burg, Germany 2 ed in fold hinges and in sheared marble bands, typical of 2UniversityUniversity of Chile, Santiago, ChileChile a transpressive regime. Their orientation coincidescoincides withwith We used data from >100>1OO permanent and temporary seisseis-- the main foliation (N0309)(N030º) andand regionalregional faultingfaulting(N1109). (N110º). mic stations toto investigateinvestigateseismicity seismicitypatterns patternsrelated relatedto to MostIVIost abundant ore mineral is pyrite, with minor galena, the 11 April 2014 M8.1 IquiqueIquique earthquake in northern chalcopyrite, sphalerite and accessory enargite, chalcocchalcoc-- Chile. Applying a multistage automatic automaticevent eventIocation location iteite and tennantite. OxidationOxidationof ofsul sulfidesfides produced producedfree free procedure to the seismic data, we detected and locatedIocated gold besides malachite. ~19,000“19,000 foreshocks, aftershocks and andbackground backgroundseis- -seis We could establish a clear correlation between betweenmi- mi- micity for one month preceding and nine month followfollow-- cro-textures in quartz observed by CL-microscopy and inging the mainshock. Foreshocks skirt around the updip different fluidfluidinclusion inclusionassemblages assemblagesin inorder orderto tobetter better limitIimit ofofthe the mainshock asperity; aftershocks occuroccur mainlymainly constrain the PT-fluidPT—fluid evolutionevolutionduring duringthe themain mainmineral- mineral- inin two belts updip and downdip of it.it. The updip seisseis-- izationization andand subsequentsubsequent cooling.cooling. PrimaryPrimary H20-C02-NaClH2O-CO2-NaCl micity primarily locatesIocates in a zone of transitional frictionfriction fluidfluid inclusionsinclusions withwith 11-1411-14 wt%wt% salinitysalinity andand homogeniza-homogeniza- on the megathrust and can be explained by preseismic tion temperaturestemperatures (Th)(Th) ofof 330-390°C330-390°C areare foundfound inin non-non- stress loadingIoading due to slow-slipsIow-slip processes and afterslip deformed quartz (T0) showing blue CL. Various alteration driven by increased Coulomb failure stress (CFS) due textures (T1-T4)(T1-T4) are marked by quartz with brown and to the mainshock and its largestIargest aftershock. Afterslip Afterslip reddishreddish CL, which hosts different types typesof offluid fluidinclu- inclu- further south also triggered aftershocks and andrepeating repeating sions: Short trails of pseudo-secondary fluidfluid inclusions inclusions earthquakes in several E-W striking streaks. We interinter-- containing H2O-CO2-NaCl-CaCl2H20-C02-NaCI-CaCl2 (12-13 wt% NaClNaCI + 2-3 pret the streaks as markers of surrounding creep that wt% CaCl2;CaCI2; Th 180-350°C) are associated with a diffusive could indicate a change in fault mechanics and may have network of subgrains (T1), whereas another set of H2O-H20- structural origin, caused by fluid-inducedfluid-induced failure failure along along CO2-NaClC02-NaCI ±CaCl2iCaCI2 fluidfluid inclusionsinclusions (10-14(10-14 wtwt %% NaCINaCl ++ 0-70-7 presumed megathrust corrugations. Megathrust Megathrustafter- after- wt% CaCl2;CaCI2; Th 200-350°C)ZOO-350°C) is associated with late-formed shocks terminate updip below the seaward frontal prism grain boundaries (T2). Fluid pathways of fine-grainedfine-grained inin the outer continental wedge wedge that thatprobably probablybehaves behaves quartz (T3) are free of fluidfluid inclusions.inclusions. TheThe Iatestlatest fluidsfluids aseismically under velocity-strengthening conditions. recordedrecorded as fluidfluid inclusions inclusionsare aretrapped trappedalong alonghealed healed The inner wedge locatesIocates further landward overlying the micro-fractures (T4) and contain low-salinitylow—salinity H2O-NaClH20-NaCI megathrust“smegathrust”s seismogenic zone. Further downdip, afterafter-- fluidsfluids (6-7(6-7 wt%;wt%; ThTh 150-220°C).150-220°C). shocks anticorrelate withwith thethe twotwo majormajor afterslipafterslippatches patches The mineralizing H2O-CO2H20—C02 fluidfluid must musthave havebeen been resolvedresolved geodetically and andotherwise otherwisecorrelate correlatewith within- in- trapped at ca. 500-550°CSOG-550°C / 3 kbar, associated to stress creased CFS, overall indicating heterogeneousheterogeneous frictionalfrictional relaxationrelaxation andand hydrothermalhydrothermal circulationcirculationafter afterthe thepeak peakof of behavior. A region of sparse seismicity at ~40-50“40-50 km metamorphism. During cooling CO2C02 may have been lost depth is followed by the deepest plate interface afterafter-- by carbonation. Besides,Besides, thethe fluidfluidbecame becameslightly slightlymore more shocks at ~55-65“55-65 km depth, which occur in two clustersClusters saline and enriched in CaCl2CaCI2 as a resultresult of feldspar alaI-- of significantlysignificantly differentdifferentdip. dip. teration. TheThe Iatterlatterfluids fluidsare aretrapped trappedaround aroundthe thequartz quartz brittle-ductilebrittIe-ductile transition transitionzone zoneat at350-300°C 350-300°C/ 2.5-3/ 2.5-3kbar kbar (T1)(T1) and 300-260°C / 2-2.5 kbar (T2), together with the precipitation ofof gold.gold. LateLate fluidsfluidsof oflow-salinity low-salinitymay mayrep- rep- Constraining the magmatic-hydrothermal resentresent the influxinflux of ofmeteoric meteoricwater, water,trapped trappedin inmicro- micro- fluidfluid evolutionevolutionfrom fromproximal proximalto todistal distal fractures below ca. 280°C (T4).(T4). settingsby byfluid fluidinclusion inclusionand andisotopic isotopic The structural data and high fluidfluid trapping trappingtempera- tempera- analyses of ore and gangue minerals and tures classify the veins as orogenic gold mineralization. numerical modelling The findingfinding ofof anan EdiacaranEdiacaran coolingcooling ageage ofof 592.8592.8 i8.7±8.7 MaMa for muscovite (closure(closure temperature 425°C) inin the veins M. StoltnowStoltnowl'z,1,2, V. LüdersLüdersl,1, P.P. WeisWeisl,1, R. L. RomerRomer11 isis consistent with the regionalregional framework of a cratonic 11GFZGFZ German Research Centre for Geosciences, Potsdam, Germany 2 foreland, which was strongly reworkedreworked during the NeoNeo-- 2UniversityUniversity of Potsdam, Geosciences, Potsdam, Germany proterozoic Brasiliano Orogeny. Magmatic-hydrothermalIVIagmatic-hydrothermal systems systems form form a avariety varietyof ofore ore deposits at different proximitiesproximitiesto toupper-crustal upper-crustalhydrous hydrous magma chambers, ranging from greisenization in inthe the Probing the Northern Chile megathrust roofroof zone of the intrusion, porphyry mineralization atat in-in- with seismicity —– The 2014 M8.1 Iquique termediate depths to epithermal vein deposits near the earthquake sequence surface. The physical transport processes and chemical precipitation mechanisms mechanismsvary varybetween betweendeposit deposittypes types 84 ABSTRACTS and are often stillstilldebated. debated.For Forthis thisstudy, study,we weinvestigate investigate for Sparassodonta and their potential competitors competitorsin in the fluidfluid evolutionevolutionfrom fromproximal proximalto todistal distalsettings settingsat theat the South America (six families of Carnivora) collected from Pirquitas and Chinchillas Mines in NW Argentina andand thethe the literatureIiterature and museums databases. All analyses were Sweet Home Mine, Colorado. done with a Bayesian framework in the PyRate software. New results from fluidfluid inclusioninclusion andand isotopicisotopic analysesanalyses First, we estimated thethe preservationpreservationrate rateand andthe thetimes times indicateindicate a contribution ofof magmaticmagmaticfluids fluidsin inthe theforma- forma- and rates of speciation andand extinctionextinctionthrough througha revers-a revers- tion ofof thethe Sn—AgSn–Ag PirquitasPirquitas Mine,Mine, eveneven thoughthough nono directdirect ibleible jump Markov Chain Monte Carlo (RJMCMC).(RJMCMC). We ranran association toto aa magmaticmagmaticintrusion intrusionis isvisible. visible.Therefore, Therefore, 20000000 RJMCMC iterations andand sampledsampled onceonce everyevery this deposit may representrepresent a ratherrather distal setting.In Incon- con- 5000 to obtain posterior estimates of ofthe theparameters. parameters. trast, the Ag–Pb–ZnAg—Pb—Zn Chinchillas Mine is hosted in volcanic Additionally wewe testedtested ifif thethe diversidiversificationfication dynamics dynamicsof of extrusive units and is directly associated to an underlying Sparassodonta may be linkedIinked with changes in body mass dacite diatreme. In that respect, this deposit is proximal (using(using a Covar birth–deathbirth—death model) and inin global temtem-- to a volcanic complex, but due to its shallow emplaceemplace-- perature (using a birth–deathbirth—death model with time-varying ment is distal to an inferred magmatic intrusionintrusion atat depth.depth. rates).rates). InformationInformation ofof bodybody massmass andand temperaturetemperature werewere The Ag–polymetallicAg—polymetallic Sweet Home Mine (currently mined obtained from the literature.Iiterature. FinallyFinaIIy we assessed the efef-- for gemmy rhodochrosite)rhodochrosite) isis relatedrelated to an assumed hidhid-- fect of competitionon onthe thediversification diversificationof Sparasso- of Sparasso- den Mo porphyry, but may be locatedIocated more proximal to donta with a Multiple CladeClade DiversityDiversity DependenceDependence mod-mod- a magmatic intrusionintrusion asas comparedcompared toto thethe otherother deposits.deposits. el.eI. Our results show temporal changes in both speciation Performing fluidfluid inclusion inclusionanalysis, analysis,Raman Ramanspectros- spectros- and extinctionrates ratesfor forSparassodonta, Sparassodonta,supporting supportingthe the copy, noble gas isotopic compositions and andLA-ICPMS LA-ICPMS ideaidea that the demise of a clade isis controlled by the two measurements as wellwelI as the analysis of stable (H, O, S) factors. Regarding body size there isis a trend where the and radiogenic (Pb, Sr) isotopic compositions, we we aim aim largerlarger body mass inin Sparassodonta appears laterlater inin their to reconstructreconstruct the evolution andand P-T—xP-T-x propertiespropertiesof ofthe the evolutionary history.history. AlthoughAlthough thethe changeschanges inin bodybody massmass ore-forming fluidsfluids inin thethe respectiverespectiveore oredeposits. deposits.As Asall all are not related to the speciation rate,rate, theythey areare relatedrelated toto studied deposits are characterized by a distinct sulsulfidefide the extinctionrate rate(i.e., (i.e.,as asthe thesize sizeincreased, increased,the theextinc- extinc- mineralization stage, stage, we we also alsoinvestigate investigatewhether whetherthis this tion raterate decreased).decreased). NoNo significantsignificantcorrelations correlationsemerged emerged stage has formed by mixing of magmatic fluidsfluidswith withvari- vari- between the global temperature curve and changes in able amounts of externally derived fluids.fluids. Furthermore,Furthermore, diversificationdiversification rates. rates.FinaIIy, Finally,clade cladecompetition competitiondid not did not numerical modelling of the transition from froma aporphyry porphyry affect the thediversification diversificationdynamics dynamicsof Sparassodonta; of Sparassodonta; to an epithermal environment, considering country rockrock speciation rate rate felI fell before beforethe thedispersion dispersionof Carnivora of Carnivora permeability, fluidfluid pressurepressure distribution,distribution,fluid fluidtempera- tempera- inin South America. InIn conclusion, these new techniques tures, and varying locationsIocations ofof thethe magmaticmagmaticplume, plume,is is can improve our knowledge of the evolution ofof thethe taxataxa used to build a quantitativemodel modelfor forthe theformation formationof of but more studies are required to elucidate the demise of these types of epithermal deposits. Sparassodonta.

Analysis of diversificationdiversification histories historiesin inextinct extinct The Iglesias Complex in the Merida Andes carnivorous marsupials (Sparassodonta, Venezuela: A record of Cambrian-Silurian Metatheria) using a Bayesian framework continental arcarc andand Permo-TriassicPermo-Triassic PangeaPangea S.S.Tarquini1, Tarquini1, S. LadevèzeLadevezez,2, F. PrevostiPrevostil'31,3 amalgamation inin westernwestern GondwanaGondwana 11CRILARCRILAR -— CONICET, Anillaco, Argentina M. D. TazzoTazzol,1, B. WeberWeberl,1, A. SchmittSchmittz,2, R. González-Gonzalez- 2 2CR2P,CR2P, UMR 7207 - MNHN, CNRS, Sorbonne Université,Universite, Paris, France GuzmánGuzmanl,1, V. ValenciaValencia3,3, D. FreiFrei4,4, P. SchaafSchaaf5,5, L.L. SolariSolari66 33UNLaR,UNLaR, Departamento de Ciencias Exactas, FísicasFisicas y Naturales, La 1 Rioja, Argentina 1CentroCentro de InvestigaciónInvestigaciön CientificaCientíficay dey deEducacion EducaciónSuperior Superiorde de Ensenada (CICESE), Ensenada, Mexico 2 South America was isolated during a great time ofof thethe 2UniversitätUniversität Heidelberg, Heidelberg, Germany 33WashingtonWashington State University, Pullman, United States Cenozoic, allowing an endemic terrestrial biota to 44UniversityUniversity of the Western Cape, Cape Town, Germany evolve.evoIve. Within mammals, the carnivore guild was occuoccu-- 55UniversidadUniversidad Nacional AutónomaAutönoma de Mexico, Ciudad de México,Mexico, pied by the Sparassodonta from the Palaeocene to the Mexico 66UniversidadUniversidad Nacional AutónomaAutönoma de México,Mexico, Querétaro,Queretaro, Mexico Pliocene.PIiocene. Moreover, from the late Miocene - Pliocene, carnivorous placentals (Carnivora) began to colonize the The metamorphic basement of the MéridaMerida Andes in continent fromfrom NorthNorth America,America, afterafterthe theformation formationofthe of the western Venezuela is constituted of ofEarly EarlyPaleozoic Paleozoic IsthmusIsthmus of Panama. Given that, some authors proposed metasedimentary rocks, orthogneiss, and amphibolite of the „competitivedisplacement” displacement“hypothesis hypothesisjustifying justifyingthe the the IglesiasIglesias Complex. InIn this work, U-Pb-Hf-OU-Pb—Hf—O data in zirzir-- extinction of sparassodonts by the arrival of carnivorous extinction of sparassodonts by the arrival of carnivorous con, Rb-Sr geochronology, and Hf-NdHf—Nd isotope systematics placentals, while others proposed an „opportunistic re-re- are combined to constrain the magmatic andand metamor-metamor- placement”. We compiled a data set of fossil occurrences placement“. We compiled a data set of fossil occurrences phic history of these rocks. The results are framed in the ABSTRACTS 85 tectonic settingsproposed proposedfor forNorthwestern NorthwesternGondwana Gondwana surrounding Neoproterozoic belts that widely overlap in and correlated with equivalent Paleozoic rocks in other time thethe MinasMinas orogenyorogeny suggestssuggests itsits largerlarger primaryprimary ex-experi-Gondwanan crustal fragments. Paragneiss and schist tent, forming the paleocontinent. CoevalCoeval orogenicorogenic unitsunits derived from pelitic-psammiticand andvolcaniclastic volcaniclasticpro-- pro similarly occur in the northeastern portion of ofthe theSäo São toliths, locallyIocally alternating withwith amphiboliteamphibolite Ienseslenses sug-sug- Francisco craton (Salvador-Itabuna-Curaçá(Salvador-Itabuna-Curaca belt) and in gesting aa volcanicvolcanic oror volcaniclasticvolcaniclasticorigin. origin.Detrital Detritalzircon zircon the African counterpart such as the Eburnean orogeny ages suggest that sedimentation ofof paragneissparagneiss protolithsprotoliths and the Kimezian basement of the West Congo belt. The spans from ~520“520 Ma to ~490“490 Ma, whereas chemical and evolution ofof thethe MineiroMineiro beltbelt -- thethe bestbest studiedstudied orogenicorogenic isotopicisotopic signatures are suggestive ofof sedimentationsedimentationin ina a domain - comprises four distinct groupsgroups ofof subduction-subduction- back-arc setting.Biotite-garnet Biotite-garnetorthogneiss orthogneissprotoliths protolithsin- in- relatedrelated granitoids generated between 2.47 and 2.10 Ga truded Cambrian paragneiss at ~487“487 Ma, during crustal within a Siderian-Rhyacian ocean, as inferred by whole thickening and Barrovian metamorphism (M1), reachingreaching rockrock Nd-Sr and coupled zircon Hf isotopic constraints. anatexis at ~467“467 Ma. Gneissic rocks were later intruded The associated volcano-sedimentary successions deposdepos-- by maficmafic toto intermediateintermediate Iower-crustlower-crust andand mantIe-derivedmantle-derived itedited inin islandisland arc settingsduring duringthe thesame sameage ageinterval interval magmas (now hornblende orthogneiss and amphibolite) of the granitoids. They mainly derived from PaleoproPaleopro-- inin a back-arcback—arc settingat at“460-455 ~460-455Ma. Ma.Later, Later,a acompres- compres- terozoic sources, as indicatedindicated by zircon U-Pb provenance sional settingIed ledto tohigh-grade high-grademetamorphism metamorphism(M2) (M2)at at studies and zircon Hf constraints. From a geodynamic ~450“450 Ma, followed by decompression melting atat “430-~430- point of view, the Minas orogeny resumed apart from 420 Ma (M3). Finally, an upper greenschist-facies overover-- the primeval Archean landmass,Iandmass, shortly following GOE print in the metamorphic complex occurred at ~250“250 Ma and/or accompanying deposition of ofthe theLake-Superior Lake-Superior (M4).(M4). The Early Paleozoic tectonothermal events are type strata (the(the Minas Supergroup), including banded relatedrelated to alternating cycles cyclesof ofadvance advanceand andretreat retreatof of ironiron formation, in inthe thepassive passivebasin. basin.The orogenic The orogenichis- his- the subduction slabslab inin anan activeactivecontinental continentalarc, arc,broadly broadly tory evolved, respectivelyrespectively asas anan intra-oceanicintra-oceanic arcarc systemsystem recognizedrecognized as the Famatinian orogeny, orogeny,which whichformed formed and a continental marginmargin basinbasin thatthat interactedinteracted andand coI-col- along the proto-Andeanproto—Andean margin of Western Gondwana. lidedlided during the transition between betweenthe theRhyacian Rhyacianand and The Permo-Triassic metamorphism is related to the finalfinal Orosirian periods (ca. 2.10-2.05 Ga), eventually causing amalgamation ofof crustalcrustal blocksblocks toto formform thethe PangeaPangea su-su- widespread deformation and andmetamorphism metamorphismover overthe the percontinent, probablyprobably drivendriven byby latelate tectonictectonic effectseffectsor or foreland and reactivatingreactivating structures structuresformed formedduring duringan an diachronic formation ofof thethe Ouachita-Marathon-SonoraOuachita-Marathon-Sonora Archean dome-and keel formation event.event. TheThe globalglobal sce-sce- suture between Gondwana and Laurentia. The TheIglesias Iglesias nario envisages potential linkslinks betweenbetween thethe Congo-SäoCongo-São Complex has several similarities to to rocks rocks of ofthe thesame same Francisco palaeocontinent and andColumbia ColumbiaSuperconti- Superconti- age in other crustal fragments adjacent to Northwestern nent, given by paleogeographic correlation ofof Rhyacian-Rhyacian- Gondwana, such as the Santander Massif in Colombia, Orosirian aged crustal segments on nearly all continents. and the AcatlánAcatlan Complex and the Maya Block in southern Mexico-Central America. However, the pre-Ordovician history of the Maya Block is different becausebecause thisthis base-base- Autogenic controls on the distribution ment hosts inliersinIiers of Stenian-Tonian crustal rocks, as well of sediments and palaeosols in ancient as metasedimentary rocks associated with the Rodinia distributive fluvial systems (Bauru basin, Supercontinent break-upbreak-up (“600-580(~600-580 Ma).Ma). distributive fluvial systems (Bauru basin, Brazil) M. V. Theodoro SoaresSoaresl‚1, G. BasiliciBasilicil,1, T. da Silva MarinMarin-- The Paleoproterozoic Minas Orogen, SãoSäo hohol‚1, A. Guillermo MartinelliMartinelli1‚1, A. MarconatoMarconatol‚1, F. RomérioRomerio Francisco Craton reviewed: insights into Abrantes JúniorJüniorl,1, R. VásconezVäsconez GarciaGarcia11 an evolving accretionary-collision orogenicorogenic 11StateState University of Campinas, Department of Geology and Natural Resources, Campinas, Brazil system and global implications Palaeosols are ubiquitous features that appear inter- W. TeixeiraTeixeira11 Palaeosols are ubiquitous features that appear interbedded with deposits in the stratigraphic recordrecord ofof dis-dis- 11UniversityUniversity of SãoSäo Paulo/Institute ofof Geosciences,Geosciences, MineralogyMineralogy andand Geotectonics, SãoSäo Paulo, Brazil tributive fluvialfluvialsystems systems(DFS). (DFS).They Theycorrespond correspondto toopen open systems that are highly sensitive toto recordrecord changeschanges inin to-to- The Paleoproterozoic Minas orogen played a fundamenfundamen-- pography, climate,cIimate, groundwater levelleveI and periods of no tal rolerole inin the assembly of the SãoSäo Francisco-Congo papa-- sedimentation, which whichare arethe themain maincontrolling controllingmecha- - mecha leocontinentIeocontinent atat ca.ca. 2.02.0 GaGa ago.ago. ThisThis long-livedlong-lived accretion-accretion- nisms in the stratigraphic architecturearchitecture ofof DFS.DFS. ThisThis workwork ary-collision system generated the Mineiro composite applies a sediments-palaeosol approach to reconstruct belt (2.47-2.10 Ga), as well as the adjoining cordilleran a refinedrefined stratigraphicstratigraphicframework frameworkof ofan anancient ancientDFS DFSin in Mantiqueira (2.20-2.00 (2.20-2.00Ga) Ga)and juvenileand juvenileJuiz Juizde Fora de Fora the Serra da Galga Formation (Upper(Upper Cretaceous,Cretaceous, BauruBauru (2.44-2.08(244-208 Ga) complexes both exhibiting Neoprotero- Neoprotero- Basin, Brazil) to further uncover the mechanisms concon-- zoic reworking. Disperse basement complexes within the trolling sedimentation and andassociated associatedpedogenesis. pedogenesis.A A 86 ABSTRACTS total of 12 sedimentary facies, 5 architectural elements 55UniversityUniversity of Salta and CONICET, Department of Geology, Salta, and 4 pedotypes were observed from proximal to distal Argentina zones of the studied DFS. The proximal zone showed an Long profilesprofiles of ofalluvial alluvialchannels channelsare aresensitive sensitiveto the to the arrangement of large-scale channel deposits separated amount of water discharge (Qw) and sediment supply by well-drained Inceptisols. The Theintermediate intermediatezone zonere-- re (Qs).(Qs). Both are inin turn a function ofof locallocal climaticclimaticand andtec- tec- vealed a more complex framework of large-scale chanchan-- tonic conditions. AsAs such,such, changeschanges inin thethe prevailingprevailing en-en- nels coexisting withwith interchannelinterchannel andand small-scalesmall-scale ribbonribbon vironmental (tectonic, climatic) conditionsconditionswill willresult resultin in channel deposits. In this part of the system, InceptisolsInceptisols channel slope adjustments, either by sediment deposideposi-- overlay the channelised deposits, Entisols developdevelop overover tion oror byby incisionincision intointo previouslypreviously depositeddeposited sediments.sediments. proximal interchannel deposits and gleyed Vertisols oc-oc- Fluvial terraces or abandoned alluvial fans can therefore cur over distal interchannel deposits formed in lowlandsIowlands be valuable archives of past environmental conditions, on the alluvial surface. The intermediate-distal zone disdis-- as they preserve ancient river elevation proprofilesfiles of ofdis- dis- plays isolated small-scale ribbon channels interbedded tinct timestimesin inthe thepast. past. with interchannel deposits, which are overlaid by poorly- InIn NW Argentina, littlelittleis isknown knownabout aboutPleistocene Pleistoceneen- en- drained gleyed Inceptisols. FromFrom channelchannel toto interchannelinterchannel vironmental conditions. ThisThis isis duedue toto thethe Iimitedlimited avail-avail- deposits, pedotypes appearappearto to be distributed in a palaeopalaeo-- ability of paleoclimatic records, records, such suchas asinformation information catena controlled by the topography and sedimentation derived from lakeIake cores or stable isotope data from spespe-- raterate ofofthe the ancient DFS. Avulsing channels in the elevated leothems.leothems. However, many intermontaneintermontane basins within channel ridge permit the development of Inceptisols. the Eastern Cordillera of the Southern Central Andes of Entisols are areformed formedin inthe theproximal proximalinterchannel interchannelareas areas NW Argentina areare characterizedcharacterized byby multiplemultiplegenerations generations that are frequently submitted toto episodicepisodic floods.floods.On Ondis- dis- of fluvial-fillfluvial—fill terraces terracesand andalluvial alluvialfans, fans,which whichdate dateback back tal lowlandsIowlands of the interchannelinterchannel area, Vertisols appear appear several tens to hundreds of thousands of years. Here we and register some grade of groundwater influence.influence. FromFrom show that these sedimentary units provide an opportuopportu-- apex to toe, the DFS showed a larger-scale palaeocatena nity to extract information aboutabout paleo-paleo- environmentalenvironmental pattern where wherewell-drained well-drainedInceptisols Inceptisolsdeveloped developedover over conditions. topographically elevated channel ridgesridges inin the proximal By combining several geochronologic techniques, we zone, passing downstream to gleyed Vertisols inin thethe dis-dis- have reconstructed the chronology of a >200-m-thick tal floodplainfloodplain areasareas oftheof the intermediateintermediate zonezone toto ultimate-ultimate- fluvial-fillfluvial—fill terrace terracesequence sequencewithin withinthe Quebrada the Quebradadel del lyly form poorly-drained InceptisolsInceptisols at at thethe intermediate-intermediate- Toro that experienced alternating episodesepisodes ofof aggrada-aggrada- distal zone. This large-scale palaeocatena indicates that tion andand incision.incision. TheThe uppermostuppermost terraceterrace waswas dateddated toto the proximity to the groundwater levelIevel acts as the keykey ca. 500 kyr. Subsequent terraces appear to have formed mechanism controlling the distribution ofof palaeosols.palaeosols. InIn following a cyclicity of ca. 100 kyr. From those terrace conclusion, the sediments-palaeosol approach not only sediments, we reconstructed Qs at times ofof terraceterrace ag-ag- allowed a more refinedrefined tridimensionaltridimensional DFS DFSmodel, model,but but gradation based basedon oncosmogenic cosmogenic108e 10Beconcentrations. concentrations. also brought access to the major factors governing the The analyses reveal that paleo Qs over the last ~500“500 kyr architecture of the system. From proximal to intermediintermedi-- has varied at most by a factor of 4, but overall has been ate zones, topography acted as the dominant controlcontrol-- relativelyrelatively constant.constant. AsAs thethe slopeslope ofof aa riverriver channelchannel (and(and lerler on pedogenesis. Additionally, thethe groundwatergroundwater Ievellevel likewise,likewise, a terrace surface) isis a function ofof incomingincoming QsQs showed increasing control over pedogenesis of lowlandsIowlands and Qw, the information onon terraceterrace slopeslope andand paleopaleo QsQs inin a down-system direction, forming forming a asuperimposed superimposed allowed us to reconstruct paleo Qw for the times rep-rep- larger-scalelarger-scale palaeocatena. resentedresented by the terrace surfaces. We findfind thatthat riverriver dis-discharge during the onset of river incision was 1010 to 80% higher than today. Our results are in lineIine with previous Paleoclimate reconstructions fromfrom fluvialfluvial quantitativeestimates estimatesof ofpaleo-precipitation paleo-precipitationchanges changesin in sedimentary deposits in an intermontane the Central Andes, but have the advantage of dating fur-fur- basin in the southern Central Andes - A ther back inin time. Moreover,Moreover, thethe widespreadwidespread occurrenceoccurrence case study from the Quebrada del Toro, NW of fluvialfluvial fill fillterraces terracesand andalluvial alluvialfans fansthroughout throughoutthe the Central Andes offers thethe opportunityopportunity toto reconstructreconstruct pa-pa- Argentina leo-waterleo-water discharge with high spatial resolution,resolution,offering offering S. TofeldeTofeldel,1, T. SchildgenSchildgen2'3,2,3, M. StreckerStrecker3,3, B. BookhagenBookhagen3,3, a unique perspective regarding regarding the theimpact impactof ofpaleocli- paleocli- A. WickertWickert4,4, S. SaviSavi3,3, H. PingelPingel3,3, H. WittmannWittmannz,2, R. AlonsoAlonso55 mate changes on the sediment-routing systemsystem throughthrough 11UniversityUniversity of Potsdam, Environmental Science and Geography, PotsPots—- space and time. dam, Germany 22GeoForschungsZentrumGeoForschungsZentrum Potsdam, Potsdam, Germany 33UniversityUniversity of Potsdam, Geosciences, Potsdam, Germany 44UniversityUniversity of Minnesota, Department of Earth Science, Minneapolis, United States ABSTRACTS 87

Palaeoenvironmental changes over the Seismic imaging of the source region of great lastlast millennia inin the subtropical forests of megathrust earthquakes offshore Chile:Chile: anan Northwest Argentina inferredinferred fromfrom fossilfossil overview of recent results pollen records. A. M. TréhuTrehu11 and the science parties ofof thethe ChiIePEP-ChilePEP- G. TorresTorresl,1, L. LupoLupol,1, P. VignoniVignoniz,2, F. CórdobaCordobal,1, A. BrauerBrauer22 PER, PICTURES and CEVICHE expeditions 1 11InstitutoInstituto dede EcorregionesEcorregiones Andinas,Andinas, SanSan SalvadorSalvador dede Jujuy,Jujuy, ArgentinaArgentina 1OregonOregon State University, College of Earth, Ocean, and Atmospheric 22GermanGerman Research Center for Geosciences, Postdam, Germany Sciences, Corvallis, United States

Recent research has provided evidence that many tropitropi-- The slip distribution duringduring anyany particularparticulargreat greatsuduc- suduc- cal and subtropical mountain plant species of South tion zone zone earthquake earthquakedepends dependson onthe therate-state rate-statecom- com- America are shifting theirtheir rangesranges upslopeupslope asas aa responseresponse plexitypIexity of friction, the therate rateof ofstrain strainaccumulation, accumulation,the the to global warming. Some predictive modelsmodels ensureensure thatthat past history of earthquake activity, andand thethe geologygeology alongalong this trend willwiII continue inin thethe nearnear future.future. Consequently,Consequently, and adjacent to the plate boundary. To try to better un-un- documenting thethe responseresponse ofof subtropicalsubtropical forestsforests toto pres-pres- derstand how geologic structure affects thethe distributiondistribution ent and past environmental changes is very useful in dede-- of slip, we have conducted three marine expeditions inin veloping and validating vegetation vegetationmodels. models.Therefore, Therefore, the past several years to imageimage the source regionsregions of to have a greater degree of accuracy of these models, it recentrecent earthquakes with M>8IVI>8 offshore Chile. Chile.Although Although isis necessary to dispose of long-termIong-term studies. Currently, each experiment had a different operationaloperationalstrategy strategyand and long-termIong-term specificspecific datadata areare scarcescarce forfor thethe majoritymajority ofof sub-sub- spatial/temporalspatiaI/temporal footprint,footprint, theythey hadhad thethe commoncommon objec-objec- tropical tree species inin South America. InIn order to concon-- tive ofof providingproviding constraintsconstraints onon thethe geologicgeologic structurestructure ofof tribute informationinformation aboutabout howhow thethe subtropicalsubtropical treestrees (e.g.(e.g. the earthquake source region.region. During ChilePEPPERChiIePEPPER (Proj(Proj-- Alnus acuminata, Polypepis australis, Podocarpus parlaparla-- ect Exploring Prism Post-Earthquake Response) in 2012- torei, among others) of northwest Argentina respondedresponded 2013, we acquired a grid of high-resolution multichannelmultichannel to climate variability in the past, we have conducted a seismic (MCS)(IVICS) reflectionreflection profiles profilesand anddeployed deployeda densea dense high-resolution analysis analysisof ofa fossil a fossilpollen pollensequence sequencein in network of ocean bottom seismometers seismometersand andabsolute absolute order to interpret the vegetation dynamicsdynamics forfor thethe lastlast pressure sensors with integrated fluidfluid flow flowmeters metersup- up- millennium. We aimed to investigate thethe followingfollowing top-top- dip from the patch of greatest slip during the 2010 M8.8 ics:ics: 1-1- Assess ifif the temperature isis the unique parameter MauleIVIauIe earthquake. The initial goalgoal waswas toto determinedetermine howhow that inducesinduces vertical migrationmigrationof ofthe thevegetation vegetationbelts, belts, the outer accretionary wedgewedge respondedresponded toto “15~15 mm ofof slipslip 2- Distinguish vegetation vegetationresponses responsesto toregional regionalevents events deeper in the subduction zone.zone. BasedBased onon severalseveral Iineslines ofof (precipitation(precipitation variability variability Iinked linkedto tothe theactivity activityof South of South evidence, we conclude that the outer wedge along this American MonsoonIVIonsoon System). To achieve this, three sedisedi-- portion oftheof the marginmargin maymay havehave slippedslipped toto thethe trenchtrench andand ment cores of different deepdeep werewere extractedextracted inin LagunaLaguna that an abrupt deepening of the plate boundary at the Comedero (24º(249 06“S06”S - 65º659 29“29” W, 2035 m a.s.l.). Here deformation frontfront maymay havehave arrestedarrested northwardnorthward propa-propa- we present the results of the reconstruction ofof vegeta-vegeta- gation ofof rupturerupture (comparable(comparable toto aa step-overstep-over inin aa strike-strike- tion basedbased onon pollenpollen analysisanalysis thatthat spansspans thethe lastlast 12001200 yryr slip fault). During PICTURES (Pisagua/Iquique Crustal ToTo-- BP. The most important change in vegetation composi-composi- mography to Understand the Region of the Earthquake tion waswas observedobserved ca.ca. 10001000 yryr BP,BP, whenwhen PoaceaePoaceae pollenpollen Source) in 2016, 70 ocean bottom andand 5050 onshoreonshore sitessites dominated indicating thethe expansionexpansion ofof thethe grasslandgrassland byby were deployed to record the large-volumeIarge-volume airgun array drier conditions oror anthropicanthropic disturbancedisturbance Iikelike deforesta-deforesta- of the R/V MarcusIVIarcus Langseth as it acquired 4400 km of tion. Later LaterAlnus Alnuspollen pollenappears appearsas dominant as dominantuntil the until the seismic reflection/refractionreflection/refraction Iines linesin ina grida gridto toimage imagethe the present. Changes percentages in fossil pollen content, source regionregion of the 2014 earthquake offshore northernnorthern likeIike increaseincrease inin grasses, herbs and shrubs, could be relatrelat-- Chile. The goal was to obtain a 3D Vp tomographic modmod-- ed with a diverse degree of landscapeIandscape handling, and/or el, with additional constraintsconstraints onon tectonicstectonics fromfrom thethe IVICSMCS dries periods, while increases of arboreal pollen can be data, to understand the geologic reasons for a remarkremark-- attributed toto moremore humidhumid conditionsconditions(Alnus (Alnusforest forestis isre- re- able correlation betweenbetween thethe gravitygravity fieldfieldand andseismic seismicac- -ac latedIated with up to 1000 mm/yr rainfalls,rainfalls, and the montane tivity leadingleading upup to,to, duringduring andand followingfollowing thethe 20142014 IVI8.2M8.2 grassland with 600 mm/yr or less).Iess). Although, increases Pisagua/Iquique earthquake. One preliminary concluconclu-- of the Alnus forest could be relatively moremore humidhumid peri-peri- sion from PICTURES is that southward propagation ofof slipslip ods; this could also reflectreflect momentsmoments ofof colonizationcolonizationin inar- -ar during this earthquake sequence was arrested by a sigsig-- eas with strong environment disturbance (i.e. slipping). nificant changechange inin upperupper plateplate crustalcrustal structure.structure. DuringDuring This evidence suggests that precipitation alsoalso couldcould bebe aa CEVICHE in 2017, a 1500-km longIong section ofof thethe marginmargin driver of the Alnus forest dynamics. was imaged in 2D using the Langseth source and 15-km longIong streamer (~5000(“5000 km of MCSIVICS data inin all). Shots were also recorded onshore to provide constraints on lowerIower crustal velocity structure. The CEVICHE footprint covered the 2015 M8.3M83 IllapelIIIapeI and 2010 M8.8 MauleIVIaule earthquake 88 ABSTRACTS source regionsregions as well as the northern half of the 1960 Fluid inclusion and stable isotope M9.5.IVI9.5. Here subduction ofof nearlynearly thethe entireentiretrench trenchsedi- sedi- geochemistry of rare-metal pegmatites, SierraSierra ment package at the deformation frontfront isis observedobserved alongalong Grande de San Luis, Argentina most ofofthe the region, shielding the plate boundary from toto-- pography on the subducted plate. Some of the subductsubduct-- A. van den KerkhofKerkhofl,1, G. SosaSosal,1, V. LüdersLüdersz,2, T. MonteneMontene-- ed sediment may be underplated at greater depth, and grogro33 efforts toto imageimage beneathbeneath thethe continentalcontinentalshelf shelfare areongo- ongo- 11Georg—AugustGeorg-August University, GZG, Göttingen,Germany Germany ing.ing. Taken together the resultsresults indicateindicate the importanceimportance 2ZGFZ,GFZ, Potsdam, Germany 3 of both upper and lowerIower plate structures in controlling 3UBA,UBA, Buenos Aires, Argentina the evolution ofof thethe plateplate boundaryboundary andand itsits integratedintegrated InIn the Sierra Grande de San Luis, Nb-Ta-enriched pegmapegma-- responseresponse to plate tectonics. tites (398-411(398-411 lVla)Ma) outcropoutcrop inin thethe easterneastern ConlaraConlara Meta-Meta- morphic Complex, while Sn-enriched pegmatites (404- (404- 444 Ma,IVIa, Sosa et al., 2002) outcrop in the more western Testing long-termlong-term controlscontrols ofof sedimentarysedimentary Pringles MetamorphiclVletamorphic Complex. The pegmatiticbodies bodies basin architecture in the broken foreland II —– are concordantly emplaced in fine-grainedfine-grained quartz-micaquartz-mica Modelling the spatial variabilityvariability ofof thethe stratastrata schist. The pegmatites representrepresent thethe residualresidual fluidsfluidsof ofS- S- type syn-tectonic, meta- to peraluminous leucogranitesIeucogranites 1 1 1 M. VallatiVallatil,, M. MuttilVlutti1,, G. WinterleitnerWinterleitner1 of Famatinian ageage (Ortiz(OrtizSuarez Suárezand andSosa, Sosa,1991; 1991;Galliski Galliskiet et 1 1UniversitätUniversität Potsdam, Institut fürfür Geowissenschaften,Geowissenschaften,Potsdam, Potsdam, al., 2019). The Nb-Ta-enriched pegmatites showshow aa moremore Germany complex mineralogy and contain beryl, spodumene and Spatial variability variability of ofthe thestrata strataand andassociated associateddeposi- deposi- amblygonite, suggesting aa higherhigher internalinternal fractionation,fractionation, tional geometriesgeometries inin aa basinbasin determinedetermine thethe regionalregional dis-dis- whereas the Sn-pegmatites principally principallycontain containAb-Qtz Ab-Qtz tribution ofof possiblepossible reservoirreservoir andand sealseal units.units. WhileWhile thethe (albite-type).(albite-type). distribution of offacies faciescan canbe predicted be predictedto some toextent some extent Aqueous-carbonic inclusions are typically trapped in by sequence stratigraphy theories,theories, thesethese modelsmodels offeroffera a cassiterite, plagioclase, beryl, apatite, tourmaline tourmaline and and conceptual framework to extrapolate facies distribution quartz, whereas aqueous inclusions are found in columcolum-- at a regional scale, albeit as soon as the scale of observaobserva-- bite-tantalite,bite—tantalite, garnet, staurolite, quartz and in some cascas-- tion increases,increases, thesethese modelsmodels areare nono longerlonger ableable toto repre-repre- es also in plagioclase. Salinities inin aqueousaqueous inclusionsinclusions areare sent the geological complexity and the facies variability usually low. The non-aqueous phase contains CO2,C02, N2, inin a realisticrealistic andand reliablereliable way.way. CH4 and sometimes tracestraces ofof H25.H2S. InIn this project we will focus on the Yacoraite Formation The δ13C613C values of CH4 in cassiterite, plagioclase, (Salta(Salta Group) inin the Tres-Cruces sub-basin (Salta(Salta Basin, quartz and tourmaline vary between –45—45 and -37 o/ North Western Argentina). The Theoutstanding outstandingquality qualityof of oo VPDB, indicating organic organicorigin. origin.The TheC02 CO2from fromthe the the outcrops inin this locationlocation andand thethe stratigraphicstratigraphicsuc- suc- Sn-pegmatites (all (allminerals) minerals)Shows showsIower lower613C δ13Cvalues values cession of the Salta Group offer anan extraordinaryextraordinary Iabora-labora- (mainly(mainly —17 –17 to -8 o/oo PDB) compared to the Nb-Ta- tory to study spatial faciesfacies variabilityvariability inin aa post-riftpost-riftbasin. basin. pegmatites (mainly(mainly —12to–12 to O0 o/ooo/oo PDB),PDB), suggestingsuggestingmore more We will study and attempt toto interpretinterpret thethe rolerole ofof extrin-extrin- extensive assimilation ofof organicorganic materialmaterial andand therewiththerewith sic and autocyclic controls (tectonics, climate, sediment loweringIowering of the oxygen fugacity inin the Sn-bearingSn—bearing fluids.fluids. supply, inherited topography) and try to better de definefine The δ15N615N values of N2 range between 0O and +4 o/oo for and constrain the rules that determining the interplay fluidsfluids in incassiterite cassiteriteand andquartz quartzfrom fromthe Sn-pegmatite the Sn-pegmatite of clastic andand carbonatecarbonate sedimentation.sedimentation.The Thework workwill willin- -in and slightly higher (ca. +2 to +8 o/oo) for quartz from volve detailed characterization ofof outcropoutcrop analoguesanalogues toto the Nb-Ta-pegmatite, suggestingsuggestingthe themixing mixingof ofmagmatic magmatic study the spatial variabilityvariability and and3D 3Dfacies faciesarchitecture, architecture, and organogenic nitrogen. this data will serve as a basis for 3D numerical and forfor-- We can distinguish betweenbetween fluidsfluidswith witha amore moremag- mag- ward modelling (PETREL and DIONISOS) to test and simsim-- matic signature signaturewhich whichcorrelate correlatewith withNb-Ta-pegmatite Nb-Ta-pegmatite ulate a range of sedimentary processes and scenarios, mineralization, and andfluids fluidswhich whichchanged changedcomposition composition inin order to investigateinvestigate howhow tectonicstectonics andand climaticclimaticcon- con- due to interaction withwith thethe surroundingsurrounding metasediments.metasediments. ditions are areinterconnected interconnectedwith withbasin basinintrinsic intrinsicfactors. factors. Stable isotope signatures suggest that the pegmatitic Thus, this project will contribute to characterizing and fluidsfluids assimilated assimilatedorganic organicmaterial materialfrom fromthe themetasedi- metasedi- quantifying 3D3D faciesfacies distributiondistributionin inoutcrops, outcrops,analogues analogues mentary country rocks particularly inin thethe PringlesPringles Met-Met- for sub-surface exploration, atat basinbasin andand reservoirreservoir scalesscales amorphic Complex. This agrees with the idea that the and to evaluate the controls over the vertical andand laterallateral original magmatic fluidsfluidswere wereregionally regionallyhomogeneous, homogeneous, stratigraphic architecture.architecture. and that the pegmatite emplacementemplacement tooktook placeplace duringduring or shortly after thethe peakpeak ofof metamorphismmetamorphism during duringthe the Ordovician. Tin may have been leachedIeached from the Pringles Sn-enriched sediments and crystallized as cassiterite at increasingincreasing fO2f02 and/or pH conditions atat coolercooler depositiondeposition ABSTRACTS 89

sites or as a result of interaction withwith meteoricmeteoric water.water. quakes. Evidence from this research points towards large to giant transpacifictranspaciﬁc tsunamis tsunamisoccurring occurringclose closeto 1454 to 1454 References +/-36 CE and to 1297 +/-23 CE. MoreIVIore importantly, a rere-- Galliski M.A. et al. (2019) J. South A. Earth Sci. 90: 423-439.423—439. cent discovery revealed growing evidence for a Mw~9.5IVIw'”9.5 Ortiz SuarezSuárez A.A. andand SosaSosa G.IVI.G.M. (1991)(1991) Rev.Rev. As.As. Geol.Geol. Argentina.Argentina.Tomo Tomo megathrust earthquake and tsunami that caused a dradra-- XLVI (3-4): 339-343. matic social socialdisruption disruptionalong alongthis thisvast vastextremely extremelyarid arid Sosa G.M. et al. (2002) European Journal of Mineralogy, 14 (3): 627- 636. coastal region around 4000 calcaI years BP (Figure 1), sugsug-- gesting thethe capabilitycapability ofof thisthis majormajor seismicseismic gapgap toto pro-produce super-earthquakes and tsunamis at multimillennial Unveiling giant tsunamigenic earthquakes timescales withwith signisignificantﬁcant human humanconsequences. consequences. along the hyperarid Atacama Desert in the major Northern Chile Seismic Gap at The Paleozoic ClaromecóClaromecö Basin (Argentina): multimillennial timescalestimescales 3D lithosphericIithospheric scale density model. 1 2 3 G. VargasVargasl,, D. SalazarSalazarz,, J. GoffGof'f3 S.E. Vazquez LuceroLucerol,1, C. PrezziPrezzil,1, M. Scheck-WenderothScheck-Wenderothz,2, 1 1UniversidadUniversidad de Chile, Geología,Geologia, Santiago, ChileChile J. BottBottz,2, M.L.IVI.L. Gomez DacalDacalz,2, H. VizanVizanl,1, F.I. BallestriniBallestrini33 22UniversidadUniversidad de Chile, Antropología,Antropologl’a, Santiago, ChileChile 1 33UniversityUniversity of New South Wales, Pangea Research Centre, School of 1 CONICETCONICET— – IGeBA,IGeBA, Universidad de Buenos Aires, Facultad de Ciencias Biological, Earth and Environmental Sciences, Sydney, Australia Exactas y Naturales. Buenos Aires, Argentina. 2 GFZ German Research Centre for Geosciences — Helmholtz-ZentrumHelmholtz—Zentrum Potsdam, Germany The subduction margin of the Nazca plate beneath the The subduction margin of the Nazca plate beneath the 3 Universidad Nacional de LaLa Plata, Departamento de Sismología,Sismologia, South American plate along Northern Chile is considered FCAG, Buenos Aires, Argentina. to be amongamongthe the major seismic gap regionsregions worldwide enen-- compassing more than 1000 km between Arica (18.47ºS)(18.4795) The Paleozoic ClaromecóClaromecc’) basin is located to the southsouth-- and Huasco (28.47ºS).(28.4795). Along this major converging tectec-- east of Buenos Aires Province between 37°- 39° S and tonic margin, the lastlast largelarge tsunamigenic earthquakes 61°- 63° W and has been subject of multiple geologicalgeological were the Mw~8.8I\/Iw"'8.8 1877 CE and the Mw~8.5I\/Iw"'8.5 1922 CE and geophysical studies. Different hypotheseshypotheses andand mech-mech- events, whose rupture areas occurred along its northern anisms have been proposed for the genesis of this basin, and southern segments, respectively. OnlyOnly Iimitedlimited rup-rup- as wellweII as for the deformation ofof thethe AustralesAustrales Ranges.Ranges. tures have occurred in the mysterious segment locatedlocated The principal goal of this work is to contribute to a betbet-- inin the middle and no largelarge historical tsunamis have been ter knowledge of the ClaromecóClaromeco basin evolution onon thethe generated in front of the Taltal region (25.4ºS).(25.495). basis of the development of a lithosphericIithospheric scale 3D gravgrav-- ityity forward model. Geaingical records

_ n .-.I 'II-' -'.| ‘-'.- ‚-.|. -. „._ For the model construction, we we integrated integratedseveral several r 11"-..“‘5 n. . 'H.‘ + . data, such us geological information, a aglobal globalgravity gravity Tsunarni 1921 CE model (EIGEN 6c4), well data (Lesta and Sylwan, 2005), seismic tomographies, and pre-existing 3D3D modelsmodels oftheof the

Tsunarni 13?? {E Colorado basin (Autin etet al.,al., 2016).2016). We used the software IGMAS+IGMAS+ toto developdevelop ourour modelmodel and fitfit thethe measuredmeasured gravity,gravity, byby modifyingmodifying thethe freefree pa-parameters:rameters: the lowerIower and upper crust top layers.Iayers. „H- Concerning densities, we we parameterized parameterizedthe theIitholo- litholo- gies by assigning constant densities forfor eacheach unit.unit. ForFor thethe Colorado basin area, we selected values consistent with Autin etet al.al. (2016)(2016) andand usedused thethe bulkbulk densitydensity valuesvalues pub-pub- lishedIished for the ClaromecóClaromeco basin sediments. Our model allowsaIIows to gain insight into the MohoIVIoho depth, the variations ofof thethe thicknessthickness ofof thethe sedimentarysedimentary ininfillfill and the upper and lowerIower crust, in the studied area. We also propose a tentative locationlocationof ofthe thesouthern southernIimit limitof of InIn spite of the scarcity of data, we used a rangerange of multimulti-- the Rio de lala Plata craton. disciplinary and multiproxy approachesapproaches inin anan attemptattemptto to Our results contribute to the understanding of the identifyidentify paleotsunami paleotsunamiand andpaleoseismological paleoseismologicalevidenc- evidenc- geodynamic evolution ofof Claromecc’)Claromecó basinbasin andand oftheof the tec-tec- es. From the assessment of geoarchaeological records, tonic processes which affectedaf‘fected thethe southwesternsouthwestern marginmargin submarine features and uplifted Iittorallittoralsediments sediments-well -well of Gondwana during Paleozoic times. preserved in carefully identifiedidentified sheltered shelteredenvironments— environments- along the hyperarid coasts of the Atacama Desert, we identifiedidentified paleotsunamis paleotsunamisand andassociated associatedpaleoearth- paleoearth- 90 ABSTRACTS

tiples seismicseismic arraysarrays havehave beenbeen consideredconsidered thethe impactimpact ofof

Lower Cruat Thicknessim: their spatial dispositiondispositionhas hasnot notbeen beentaken takeninto intoaccount account

' FC-‘JÜ in-depthin-depth exacerbating potentialpotentialartifacts artifactson onthe thesolution. solution. “5:130 ' 5WD Here, we have extended the traditional time-domaintime-domain E4|3|30 ' 3'330 back-projection withwith aa multi-arraymulti-arrayapproach, approach,which whichhar- har- 52'530 Claromm Bmin nesses regionally distributed seismic stations inin additionaddition ‘ 1C'EI] to the large-scalelarge-scale arrays usually employed to widen aziazi-- muthal coverage. We have also included the analysis of multiple seismicseismic phasesphases inin thethe back-projectionback-projectionalgorithm algorithm to reducereduce source effects. OurOur analysisanalysis providesprovides aa detaileddetailed description ofof high-frequencyhigh-frequency rupturesruptures andand isis suitablesuitable toto be standardized and automated for near-real-timenear-reaI-time ap- -ap 5}. plications, whichwhich isis testedtested herehere withwith thethe 1414 NovemberNovember V02, Colorado Bann w» 2007 Mw 7.7 Tocopilla earthquake located in the southsouth-- ern edge of the northern Chile seismic gap and charchar-- 603:") Ü äÜCIJÜ 1330W 119530 206'305 256000 3mm 350030 400300 acterized with a slip distribution alongalong thethe deeperdeeper partpart Eüürdlnate 5y51em' lJTl'."I 215 of the seismogenic zone. We have calibrated the travel

References time correctionscorrectionswith withsome someof ofthe thelarge largeaftershocks aftershocksof of Autin, J.‚J., Scheck-Wenderoth,Scheck-Wenderoth, M.,M., Götze,Götze, H.—J.,H.-J., Reichert,Reichert, C.,C., Marchal,Marchal, this event inin order to be able to interpret the rupturerupture hishis-- D., 2016. Deep structure of the Argentine marginmargin inferredinferred fromfrom 3D3D tory within their context. We found the high-frequency gravity and temperature modelling, Colorado Basin. Tectonophysics rupturerupture emissions (0.5-2.0(O.5-2.0 Hz) have encircled the domidomi-- 676, 198–210.198—210. nant asperities alonrg>along thethe faultfault areaarea withwith thethe cumulativecumulative Lesta, P.,P., and C. Sylwan. 2005. Cuenca de Claromecó.Claromecö. InIn Frontera exploratoria de la Argentina 66 CongresoCongreso dede ExploracionExploración yy DesarrolloDesarrollo energy being emitted up-dipup-dip ofof thethe coseismiccoseismic slipslip areaarea de Hidrocarburos, vol. 10, pp. 217-231.217—231. and wellwelI associated with the along-dip segmentation act-act- inging as a barrier inin this region.region. The method has offered anan improvementimprovement inin terms of resolutionresolution andand datadata availabilityavailability Multi-Array Back—Projection:Back-Projection:Rupture Rupture and its application isis directlydirectly extendedextended toto differentdifferentearth- earth- quakes and rupture behaviors including the analysis of complexities duedue toto asperitiesasperitiesalong-dip along-dip complex ruptures and supershear rupture events. barriers during the 2007 Mw 7.7 Tocopilla earthquake F. VeraVeral'z,1,2, F. TilmannTilmannl'z,1,2, J. SaulSaul11 InstrumentalInstrumental monitoring of shallow slip 11GFZGFZ Helmholtz-Zentrum Potsdam, Section 2.42.4 —- Seismology,Seismology, Potsdam,Potsdam, events on active faultsfaults revealsreveals thethe abilityability Germany of velocity weakening behavior at shallow 22FreieFreie Universität Berlin, Earth Sciences, Berlin, Germany of velocity weakening behavior at shallow crustal levelsIevels Since the 26 December 2004 Mw 9.1 Sumatra-Andaman P. VictorVictorl,1, A. MütingMütingl,1, G. GonzalezGonzalezl,1, O. OnckenOncken11 earthquake, back-projection imaging imagingof ofearthquakes earthquakes 11GFZGFZ Helmholtz-Zentrum Potsdam, Section 4.14.1 -- LithosphereLithosphere Dynam-Dynam- based on high-frequency emissions has become a com- based on high-frequency emissions has become a com- ics,ics, Potsdam, Germany plementary method to Finite Source Inversions, providprovid-- inging informationinformation relatedrelated toto thethe rupturerupture area,area, rupturerupture ve-ve- Mechanical models to describe the slip behavior and disdis-- locity,locity, and energy distribution inin timetimeand andspace spacewithout without placement accumulation patternpatternof ofshallow shallowslip slipon onmajor major any prior fault geometry knowledge requirements. Its fault zones are contradictory. Recent observations sug-sug- advantages lieIie on the possibility to constrain a rupture gest that, despite low confiningconfining pressurepressure andand phyllosili-phyllosili- pattern asas soonsoon thethe datadata isis availableavailable byby consideringconsidering thethe cate rich fault gouges at shallow crustal levels,Ievels, faults can coherence of multiples Signals signalsarriving arrivingat atan anarray arrayof of exhibit velocity weakening behavior all the way to the seismometers, which in effect, contributecontribute toto dedefiningfining a a surface. These recent observations necessitatenecessitate aa reinves-reinves- complete tool for spatio-temporal monitoring>monitoring ofof globalglobal tigationofthe of theasperity asperityand andseismogenic seismogeniczone zonemodel. model.The The seismic sources and for earthquake hazard evaluations observation oftriggeredof triggered shallowshallow slipslip eventsevents onon segmentssegments at regional and teleseismic distances. Further developdevelop-- ofofthe the Atacama Fault System (AFS) in N-Chile (Victor et al.aI. ments have allowed its extension from a time-domain 2018) monitored with the IPOC Creepemter Array demdem-- approach to frequency-domain methods while multiple onstrated that the AFS exhibits the ability to slip seismiseismi-- applications have, have,for forexample, example,characterized characterizedmajor major callycaIIy at shallow depth. subduction zone zone earthquakes, earthquakes,aftershocks aftershocksdetection, detection, Our follow-upfoIIow-up study now uses the IPOC Creepmeter complex ruptures and intermediate-depth earthquakes Array to further investigate thesethese slipslip eventsevents bothboth fromfrom among others. However, despite its fast development, their instrumentally observed properties asas weIIwell asas theirtheir the dependency on largelarge arrays has severely limitedIimited the fault zone properties inin thethe field,field,to tounravel unravelthe thespectrum spectrum azimuthal coverage of many events. Even when mulmul-- of fault slip modes. ABSTRACTS 91

The available instrumental dataset covers a time spanspan connectivity. of 8 years at 11 monitoring sites and comprises both trigtrig-- The deposits of Sag succession were settled during during gered shallow slip events and creep signals. The recordrecord-- the Aptian age,age, theythey areare constitutedconstitutedby bycontinental continentalcar- -car ed shallow slip events range from Imm to mm scale. Slip bonate and non-carbonate rocks associated with coeval velocities forfor thesethese eventsevents rangerange betweenbetween 10-1110-11 -10-5-10-5 basalts. The depositional environment environmentinvolves involvesa alow— low– m/sec and slip durations upup toto 300300 sec,sec, thereforetherefore cover-cover- temperature hydrothermal and evaporitic conditions, conditions, inging a spectrum from creep events to slow earthquakes. with strong influenceinfluence ofof ascendingascending Ca-IVIg-SiCa-Mg-Si richrich fluidsfluids Further decomposing the time seriesseries recordedrecorded atat thethe that migrate through faults, emerging in a subaerial and creepmeter stations we we are areable ableto todifferentiate differentiatebe-- be lacustrinelacustrine spring. tween slow creeping fault segments and others which The predominant facies of Sag deposits are: shrub- are accumulating displacementdisplacement solelysolely byby triggeredtriggered shal-shal- likelike limestones,limestones, bedded travertines, laminatedlaminated microbialmicrobial lowlow slip events. As a resultresult of this analysis we can state boundstones, Mg-richIVIg-rich silicate argillites, as well as high that only one of the fault segments preferentially creepscreeps to lowlow energy reworkedreworked facies. The deposits were hethet-- at shallow depth, whereas the others preferentially ac-ac- erogeneously modified byby earlyearly diagenesis,diagenesis, representedrepresented cumulate permanent displacement by accumulation ofof by intense replacement/cementation by by dolomite dolomiteand and slow slip events. Additionally in inthe thedecomposed decomposedtime time quartz and a varied degree of dissolution, inin somesome casescases series of one fault we see a transient creep signal of 1,5 relatedrelated to karst features. years after anan unusualunusual rainfallrainfall event,event, whichwhich cancan bebe clearlyclearly As a consequence of geological heterogeneity, these discriminated from the otherwise not creeping signal. rocksrocks present a wide rangerange of types and sizes of porosporos-- Comparing these observations with withthe thefault faultgouge gouge ityity at many scales, which makes itit difficultto topredict predict thickness at the creepmeter sites, we findfind aa strongstrong cor-cor- the permeability values or the flowflow conditions conditionsof ofthe the relationrelation ofof segmentssegments exhibitingexhibiting10 10cm cmthick thickfault faultgouge gougeat at reservoir.reservoir. Thus, the understanding of the geological and the monitoring site and creeping fault behavior. By concon-- petrophysical heterogeneities is iscritical criticalfor forbetter betterthe the trast fault segments, accumulating displacementdisplacement onlyonly viavia classificationclassification methods methodsthat thathonor honorthe thereservoir reservoirstatic static triggered shallow slip events, do not have a fault gouge properties. developed. Instead these fault contacts are developed in a strongly fragmented basement/basement contact zone or show a submillimeter thin sharp contact in alluvial Reconstructing pastpast climaticclimaticchanges changesusing using fan sediment. These firstfirst resultsresults demonstratedemonstrate thatthat AFSAFS lacustrinelacustrine sediments from Laguna Comedero, fault segments at shallow depth exhibit a spectrum of NW Argentina fault slip modes rangingranging from creep to slow earthquakes NW Argentina that is closely linkedlinked to fault zone properties, thereforetherefore P. VignoniVignonil'z,1,2, R. TjallingiiTjallingiil,1, F.F. CórdobaCordoba3,3, B. PlessenPlessenl,1, G. corroborating thethe abilityability ofof seismicseismic rupturerupture potentialpotentialat at TorresTorres3,3, L. LupoLupo3,3, A. BrauerBrauer11 shallow crustal levels.levels. 11GFZGFZ German Research Centre for Geosciences, Section 4.34.3 ClimateClimate dynamics and landscape evolution, Potsdam,Potsdam, GermanyGermany 22UniversitätUniversität Potsdam, Potsdam, Germany 33InstitutoInstituto dede EcorregionesEcorregiones AndinasAndinas (INECOA)—CONICET—UNJu,(INECOA)-CONICET-UNJu, Jujuy,Jujuy, Carbonate reservoirs of Brazilian pre-salt Argentina A. VidalVidall'21,2 The present rainfall pattern inin thethe easterneastern flankflankof ofthe the 1 1Unicamp,Unicamp, DGRN, Campinas, Germany Central Andes of NW Argentina resultsresults from fromthe theinter- inter- 22UniversityUniversity of Campinas - UNICAMP,UNICAIVIP, Geology, Campinas, Brazil play between topography and moisture transport during The Brazilian pre-salt oil filedfiled provinceprovince waswas discovereddiscovered inin the wet season, mainly controlled by the dynamics ofofthe the 2006 and currently produces roughly 1.5 million barrels South American Monsoon System (SAMS).This(SAIVIS).This region is of oil per day. The province comprises a lacustrine rift sensitive toto shiftsshiftsin inthe theSAMS, SAMS,as aswell wellas asthe thesuperposi- superposi- and Sag deposits developed under transgression by the tion ofof otherother large-scalelarge-scale phenomenaphenomena (e.g.,(e.g., EIEl NiNiñofio South-South- breakup ofofthe the Gondwana supercontinent. TheThe mainmain res-res- ern Oscillation, PaciPacificfic Decadal DecadalOscillation) Oscillation)and andtherefore therefore ervoirs are distributed in the Santos and Campos Basins, constitutes a akey keyregion regionfor forobtaining obtainingrealistic realisticregional regional locatedlocated at the east coast of Brazil. reconstructionsreconstructions ofof pastpast Climateclimate variability.variability. InIn thisthis sense,sense, The deposits of the rift phase phasewere weresettled settledduring during the timing andand extentextent ofof precipitationprecipitationchanges changesprior priorto to the latelate Barremian-Early Aptian ages, ages,and andare aremainly mainly the instrumentalinstrumental period inin this area are still largelylargely un-un- described as shell condensed deposits (coquinas) interinter-- known, preventing aa betterbetterunderstanding understandingof ofthe thelong- long- bedded with shales under a lacustrine system. The main term drivers of the SAMSSAIVIS and their effects overover thethe Cen-Cen- carbonate facies are described as rudstones and floatfloat-- tral Andes of NW Argentina. LagunaLaguna ComederoComedero isis aa highlyhighly stones constituted byby bivalvebivalve andand gastropodgastropod shellsshells andand variable shallow lake located in the subtropical forest of their fragments. The rudstonesrudstones are the dominant reserreser-- the Yungas in the foothill of the Argentine EasternEastern Cor-Cor- voir facies, where the sorting andand diageneticdiageneticprocess, process,as as dillera (24º(249 06“06” 54.7“54.7” S - 65º659 29“29” 7.2“7.2” W, 2,035 m asl). dissolution ofof shells,shells, enhanceenhance thethe porepore systemsystem andand thethe A multi-proxy analysisanalysis ofof anan 1111 m-longm-long sedimentsediment recordrecord 92 ABSTRACTS

of this lakeIake system provides new data for reconstructing F. VilelaVilelal,1, A. C. Pedrosa SoaresSoaresz,2, F. LucassenLucassen3,3, S. KasKas-- the regionalregional latelate Holocene climate history inin this regionregion emannemann33 of South America. 11UniversidadeUniversidade Federal de MinasIVIinas Gerais/Geological Survey of Brazil, Geology, Belo Horizonte, Brazil Seormenl 2 .; ÜEFlh I-El'l'} |_| ELt-J JLL-J |1. ;_' n: -| "J, 2UniversidadeUniversidade Federal de MinasIVIinas Gerais, Geology, Belo Horizonte, Brazil 33UniversityUniversity of Bremen, Geosciences, Bremen, Germany

Diamictiticiron ironformations formations(DIF) (DIF)from fromthe Neoprotero- the Neoprotero-

p zoic IVIacaübas Group (Nova Aurora Formation, Riacho

-| zoic Macaúbas Group (Nova Aurora Formation, Riacho I ‚l'- PoçõesPogöes Member) are potentially associatedassociated withwith aa Cryo-Cryo- _‚H.'.IH*

|3... genian glaciation notnot yetyet preciselyprecisely dateddated inin thethe region.region. The studied DIF deposits, hosting largelarge vqmevolume ofof ironiron oxides, formed during a rifting stage stage of ofthe theMacaübas Macaúbas basin. They are classifiedclassiﬁed as ashematite-type hematite-typeDIF DIFand and magnetite-type DIF DIFdeposits, deposits,according accordingto tothe thevariable variable contents of the main iron oxides found in the metameta-- diamictite matrix.matrix. TheThe hematite-typehematite-typeDIF DIFdeposits depositsmostly mostly includeinclude mylonitic, matrix-supported matrix-supportedmetadiamictites metadiamictitesof of grey color, generallygeneraIIy containing 5 to 60% (all % refer to vol%voI% as modal estimates) ofof totaltotal ironiron oxideoxide inin matrix.matrix. Fine-grainedFine—grained (< 0.1 mm to 0.55 mm) hematite occursoccurs dis-disseminated in the foliated matrix and concentrated in dede-- formation bands.bands. Hematite-typeHematite-typeDIF DIFalso alsoincludes includesquartz quartz ...... l-l'" l' IlIJIIl E'u'r I: -'r 'ulll-u'E l'. -'-_-::||_ '.‚'I_-| ‚' I:|'._- ||:| III'I-I Ii..|:'_1 (25-46%),(25-46%), muscovite (8-28%)(8-28%) and carbonate (1-10%), as Our results reveal important changes in sedimentation, wellwelI as epidote and biotite thatthat locallylocally cancan reachreach upup toto from detrital brown layersIayers inin the lowerIower part of the core 5% and 8%, respectively. OtherOther accessoryaccessory mineralsminerals areare to an alternation ofof graygray clasticclasticand andblack blackorganic-rich organic-richin- in- tourmaline (< 2%) and apatite (<(< 2%).2%). LargeLarge (up(up toto 11 mm)mm) tervals with abundant plant debris inin the upper 3.5 m magnetite porphyroblasts porphyroblasts(< (<3%) 3%)are areeuhedral euhedralcrystals crystals (Fig.(Fig.1).Below 1). Below this sediment depth TOC and S values are disseminated in matrix or deformed in mylonitic bands.bands. low,Iow, inin combination withwith highhigh valuesvalues ofof elementselements indica-indica- The dark grey magnetite DIFDIF isis generallygenerally richerricher inin FeFe thanthan tive ofof detritaldetrital inputinput (e.g.(e.g. Ti),Ti), revealingrevealing nono variationvariationof of the hematite DIF,DIF, butbut lessless abundant,abundant, mostlymostly occurringoccurring inin detrital sediments and lowIow ammounts of organic matter. highly deformed shear zones that show increase in magmag-- However, TOC, C/N and S values stongly increase above netite contentcontent inin relationrelationto tohematite hematite(< (<10% 10%to toabsent). absent). 3.5 m. TOC values in the upper 3.5 m ranges from 0.1 to MagnetiteIVIagnetite reaches reaches up upto to40% 40%of ofthe thematrix matrixvolume, volume, 20.5%, while organic C/N atomic ratio reachesreaches valuesvalues upup being usually porphyroblastic, and andeuhedral euhedralto tosubhe- subhe- to 17,17, suggesting aa substantialsubstantialcontribution contributionof ofterrestrial terrestrial dral. Quartz (30-75%), muscovite (5-25%) and carboncarbon-- organic matter inin somesome Iayers.layers. TheseThese intervalsintervals alsoalso showshow ate (3-15%) are the other main components of matrix. lowIow Ti and high S and Fe/AlFe/AI values that toghether with Chlorite and biotite cancan bebe presentpresent upup toto 30%30% andand 20%,20%, the presence of Pyrite, indicateindicate periods of reducingreducing concon-- respectively.respectively. IVIagnetiteMagnetiteDIF DIFwith withabundant abundantChlorite chloriteand and ditions atat thethe Iakelake bottom.bottom.Changes Changesrecorded recordedin inLaguna Laguna biotite showsshows greengreen coIorcolor andand commonlycommonly exhibitexhibit garnetgarnet Comedero sediments reveal that the deposition in inthe the porphyroblasts. Despite the regional deformation and and lakeIake varied strongly inin the upper 3.5 m of the sediment mylonitizationin inshear shearzones, zones,magnetite magnetitecrystals crystalstend tend recordrecord indicatingindicating anan importantimportant environmentalenvironmental changechange atat to keep euhedral habitus with no evident deformation the beginning of the lastlast millennium (ca. AD 1,092). FurFur-- features. To establish the sedimentary provenance of ther analysis needs to be done and a detailed chronologchronolog-- the metadiamictites andand thethe sourcesource ofof iron,iron, isotopeisotope ana-ana- icalical framework isis still requiredrequired toto revealreveal thethe linklink betweenbetween lyzeslyzes were carried out on drill core samples from three these sediment recordrecord changes and the past climate and DIF deposits named blocks 7, 8 and 13. Preliminary rere-- environmental fluctuationsﬂuctuations for forthis thisregion. region.Thus, Thus,future future sults from whole-rock samples yielded εNdeNd values from resultsresults will provide important insights on the past SAMSSAIVIS -3.2 to -11.3, 87Sr/86Sr(i) from 0.7073 to 0.7650, and activity inin thethe easterneastern slopeslope ofof thethe southernsouthern CentralCentral An-An- 207Pb/204Pb(i) from 15.6 to 15.7. In the three sampled des. localities,localities, a ashift shiftfrom frommore morenegative negativeto less tonegative less negative εNdeNd values can be observed from the Fe-poor to Fe-rich metadiamictites (-7.6(-7.6 toto -3.9,'-3.9; -11.2-11.2 toto -3.6;-3.6; -9.9-9.9 toto -8.6).-8.6). Samples from blocks 7 and 13 reveal a pronounced shift IsotopicIsotopic (Nd-Sr-Pb) signature of the inin the 87Sr/86Sr(i) from Fe-poor to Fe-rich units (0.7650(0.7650 diamictiticiron ironformations formationsfrom fromthe the to 0.7188, and 0.7626 to 0.7229), while the 87Sr/86Sr(i) Neoproterozoic MacaúbasMacaübas group, AraçuaíAragual' shows, in block 8, a smoother trend towards more radioradio-- orogen, SE Brazil genic values from the base to the top of the sequence. ABSTRACTS 93

Values of 207Pb/204Pb(i) are rather uniform, showing no (probably(probably producing an offlappingof'ﬂapping architecture); architecture);(4) (4) irregularirregular scatter alonrg>along sectionssectionsand andno noclear cleardifference difference based on detrital zircon dating, saltsalt depositiondepositionin inparts parts between them. of Mexico,IVIexico, at least, appears to have proceeded from concon-- tinental depositiondepositionimmediately, immediately,but butthis thisIooks looksless lessIikely likely for the US sector; (5)(5) we strongly suspect, but cannot yet prove, that salt youngs basinward in the GoMGoIVI and is Callovian-Early Oxfordian in distal areas, correlative withwith more proximal Norphlet deposition, becausebecause modelsmodels ofof Atlantic openingopening suggestsuggest thethe GoIVIGoM basinbasin waswas stillstillsmaIIer smaller at 169 Ma than the mapped expanse of autochthonous salt deposition.

#d I WM TI'.!:':::._:‚--| [H 'I'II'I'I Ih; 1 Ü.||'|.:I:r.'u" 1? I'.'I.J"IJ?-Il 1K ÜJÜFJ ': \ I'll,......

Ü.?Ü?2 : "H“. ‚I _ Veracru: Basin {M M: I "*-- _ u" Esplnn 1MB halite) 7 'gHuchlnv Sall: Dorn!

“Sri"“Sr mm1 ' 9‘». Eampeche Basin i I Wim-11 [50ml mm0 Wurm: Basin (Mata | Espinn 1|2|13 gfmum]

fix. |5q ul' Pili'ifl [Equw Ü.'i'ÜEii-“.I': ; I' üffsha-l Strontium isotopeisotope datingdatingof ofevaporites evaporitesand and gymglvmfi . ‚ . ‚ . . . - .. the breakup of the Gulf of Mexico and Proto- 135 'HÜ 1'115 15H 155 15|} 155 17"} Ä-QEl'Üu'll-‘lj Caribbean seaways Figure 1. Eeawater Strmtium evolulmn curve Showing the indnrated ages auf 1m samples analysed In thls study. B. WeberWeberl,1, J. PindellPindellz,2, S. Padilla-RamírezPadilla-Raml’rez11 11CentroCentro de InvestigaciónInvestigaciön Cienti’Científicafica y dey deEducaciön EducaciónSuperior Superiorde deEnsena- Ensena- References da B.C. (CICESE), Departamento de Geología,Geologia, Ensenada B.C., Mexico [1][1] McArthur, et al., in: Gradstein et al. (2012):(2012): The Geologic Time 2 2TectonicTectonic Analysis, Duncton, United Kingdom Scale, Elsevier, pp. 127-144 [2][2] Wiertzbowsky et al. (2017), Chemical Geology 466, 239-255.239—255. The recently installed Nu-Instruments® Thermal IonizaIoniza-- tion Mass MassSpectrometer Spectrometer(Nu-TIIVIS®) (Nu-TIMS®)with withzoom zoomoptics optics and fixedfixed FaradayFaraday cupscups atat CICESE,CICESE, Ensenada,Ensenada, Mexico,México, isis capable to analyze isotope ratios inin dynamicdynamic modemode (peak(peak Coeval Early Ediacaran Breakup of Amazonia, jumping) with perfect cup alignment, yielding precise Baltica, andand Laurentia:Laurentia:Evidence Evidencefor fora aIarge large and accurate data. Strontium isotope isotopecomposition compositionof of igneousigneous province from SIMS U-Pb dating ofof seawater and most brackish waters are uniform for a givgiv-- maficmafic dykesdykes fromfrom Mexico.Mexico. en time butbut variedvaried durinrg>during geologicgeologic historyhistory ofof thethe Earth.Earth. The Strontium evolution evolutioncurve curvecan canbe used be usedto obtain to obtain B. WeberWeberl,1, A. SchmittSchmittz,2, A. Cisneros de LeónLeonz,2, R. stratigraphic agesages fromfrom suitablesuitable saltsalt samplessamples depositeddeposited González-GuzmánGonzalez-Guzman11 inin marine environment (e.g.(e.g. [1],[1], [2]).[2]). 11CentroCentro de InvestigaciónInvestigaciön Cientl’Científicafica y dey deEducaciön EducaciónSuperior Superiorde deEnsena— Ensena- New and existing StrontiumStrontiumisotope isotopedata dataare arepresent- present- da B.C. (CICESE), Departamento de Geología,Geologia, Ensenada B.C., Mexico 22UniversitätUniversität Heidelberg, Institut fürfür Geowissenschaften,Geowissenschaften,Heidelberg, Heidelberg, ed for seven areas of evaporite deposition withinwithin west-west- Germany ern equatorial Pangea (middle America). The data show that halite was deposited on the proximal margins of the Laurentia, Baltica Balticaand andAmazonia Amazoniaformed formedthe last the frag- last- frag northern and southern Gulf of Mexico (GoM)(GoIVI) at about ment of the Rodinia supercontinent that thatbroke brokeapart apart 169-170 Ma (Bajocian), whereas a thick anhydrite was duringdurinrg> the Early Ediacaran (~630-600(“630-600 Ma, Fig. 1), leadingIeadinrg> deposited in Trinidad at 166 Ma (Callovian). The data to opening of the IapetusIapetus Ocean. An essential recordrecord toto constrain numerous problems such as: (1) the Couva establish such reconstructions andand toto identifyidentifyLarge LargeIg- Ig- Evaporite in Trinidad pertains to rifting rather rather than thanto to neous Provinces (LIPs) are coeval dyke swarms that ococ-- Cretaceous carbonate platform deposition; deposition;(2) (2)the thesalt salt cur over largeIarge extensions on formerly adjacent cratons. drilled in Mata Espino-101B (Veracruz Basin) is Bajocian Plume-relatedPIume-related maficmafic dykesdykes fromfrom BalticaBaltica(Egersund (Egersunddykes, dykes, (halite)(halite) or Bathonian (gypsum),(gypsum), but the depositional [1])[1]) and Laurentia (Long (LongRange Rangedykes, dykes,[2]) [2])are arereliably reliably site was probably beneath the Sierra Madre Oriental dated at 616 ±3i3 and 615 ±2-I_-2 Ma, respectively; however,however, thrustbelt west of Veracruz Basin before that area was similar dykes were unrecognized in the Amazonia craton part of the GoM;GoIVI; (3) a 3-9 m.y. hiatus appears to exist in or in the Oaxaquia Terrane of Mexico, a MesoproteroIVIesoprotero-- proximal areas around the GoM,GoIVI, above salt and below zoic basement block located in Rodinia reconstructions Late Oxfordian marine sequences (Norphlet „window“),„window”), between Amazonia and Baltica. HereHere wewe reportreport newnew dat-dat- caused by either marginal uplift (thermal?)(thermal?) oror byby thethe wa-wa- inging approaches by Secondary IonIon Mass Spectrometry ter levelIevel failingfailintg> to fillfill thethe basinbasin toto paleo-seapaleo-sea Ievellevel againagain (SIMS)(SIMS) from Mexico that proof a previously unrecognized 94 ABSTRACTS

LIPLIP that produced plume-related magmas over large disdis-- tances across all cratonic masses involvedinvolved inin finalfinal RodinaRodina brake-up and birth of the Iapetus Ocean. Weathering of PTt-paths of high pressure metamorphic these LIPLIP basalts may have contributed to Ediacaran GasGas-- rocks in the Sierra Pie Palo (W-Argentina): kiers glaciation. evolution of a flat collisional wedge during a 1. Polymetamorphic basement of the Chiapas MassifIVIassif evolution of a flat collisional wedge during a Complex (southeastern Mexico) contains ~1.0“1.0 Ga gneissgneiss-- „hard“ continent-arc collisioncollision es and anorthosites that were intruded by E-MORBE-IVIORB A. WillnerWillnerl,1, R. AnczkiewiczAnczkiewiczz,2, J. GlodnyGlodny3,3, J. PohlnerPohlner4,4, M. magmas prior to Ordovician high-grade metamorphism SudoSudos,5, C. R. van StaalStaal",6, G. VujovichVujovich77 [3]. Direct datintg> of these mafic intrusions is impossible [3]. Direct dating of these mafic intrusions is impossible 11Ruhr-UniversitätRuhr-Universität Bochum, Institut fürfür Geologie,Geologie, IVIineralogieMineralogie undund because zircon is either inherited from the basement or Geophysik, Bochum, Germany metamorphic. This new approach is based on the fact 22PolishPolish Academy of Sciences, Institute ofof GeologicalGeological Sciences,Sciences, Kraköw,Kraków, that zirconium exsolved from rutilerutile andand ilmeniteilmenite ofof an-an- Poland 33DeutschesDeutsches Geoforschungszentrum GFZ, Potsdam, Germany orthosite during> thermal overprints, forming metamor- 4 orthosite during thermal overprints, forming metamor- 4UniversiteeUniversiteé de Fribourg, Department of Geosciences, Fribourg, phic zircon grains with distinctivegrowth growthzones, zones,of ofwhich which Switzerland „dark“ zircon zones yielded U-Pb ages between 617 ±7-_I-7 55UniversitätUniversität Potsdam, Institut fürfür Geowissenschaften,Geowissenschaften,Potsdam, Potsdam, and 608 ±12-_I-12 MA, reflectingreflecting zircon zircongrowth growthin inhost hostanor- anor- Germany 66GeologicalGeological Survey of Canada, Vancouver branch, vancouver, Canada thosite during the intrusion of the „hot” mafic dykes. thosite during the intrusion of the „hot“ mafic dykes. 77UniversidadUniversidad de Buenos Aires, Consejo Nacional de Investigaciones CientíficasCientificas y yTecnicas, Técnicas,Buenos BuenosAires, Aires,Argentina Argentina

The Sierra Pie de Palo (W-Argentina) isis partpart ofof aa collisioncollision zone between the Cuyania microcontinent andand thethe Or-Or- dovician Famatina arcarc atat thethe W-GondwananW-Gondwanan protomar-protomar- gin. The exhumed collisional wedge is unusually wide (≥100(2100 km) with shallowly E-dipping foliations whichwhich havehave accommodated multiple shear shearevents events(IVIulcahy (Mulcahyet etal., al., 2011). In the west metasediments of the Cuyania margin predominate, in the centre metasediments intruded by MesoproterozoicIVIesoproterozoic plutons prevail, and in the east few inin-- trusions attributed toto thethe FamatinaFamatinaarc arcoccur. occur.We Weprovide provide pressure-temperature-time (PTt)-paths (PTt)-pathsfrom fromvarious various parts of the collisional wedge derived by PT pseudosecpseudosec-- tion modellingmodelling andand datingdatingof ofmetamorphic metamorphicevents. events.The The rangerange of peak PT conditions (8.5-13.4 (8.5-13.4kbar/475-570°C) kbar/475-570°C) and types of PT-pathsPT—paths are similarly distributed throughthrough-- out the wedge. Three types of PT-pathsPT—paths were recognized: (1)(1) clockwise PT-pathsPT—paths show burial to maximum depth inin the lowerlower part of the wedge followed by early thermal Figure 1: Tectonic geography of the southern hemisphere for Ediacaran times. RiftingRiftingof ofthe thelast lastpiece pieceof ofRodinia Rodiniastarted startedwith with relaxation,relaxation, (2)(2) anticlockwiseanticlockwisePT—paths PT-pathswere werecaused causedby byun- un- plume-relatedplume—related LIP (Central Iapetus Magmatic Province,Province, CIMP)CIMP) thatthat derthrusting ofof coldcold materialmaterial duringduring convergenceconvergence ororjux- jux- encompasses dyke swarms on Greenland, K Kakahari, L, Laurentia, R.R. taposition againstagainst anan upperupper coldercolder plate,plate, (3)(3) mixedmixed clock-clock- Rockall, S, Siberia, W, West Africa, E, Egersund dykes, LR, Long Range wise/anticlockwise PT—pathsPT-paths beginbegin asas clockwiseclockwise PT—pathsPT-paths dykes, Oax, Oaxaquia (SP, South Pole). followed by reburial.reburial. Exceptions areare samplessamples withwith granu-granu- 2. A plume-related dike swarm is known from the RoRo-- litelite facies peak PT-conditionsPT—conditions (8-10(8-10 kbar/700-760°C)kbar/700-760°C) andand dinia-type Novillo gneiss (northeastern Mexico). In-situ an anticlockwise PTPT pathpath similarsimilar toto occurrencesoccurrences easteast ofof U-Pb micro-baddeleyite (7-10µm)(7-10um) dating yieldedyielded thethe ﬁrstfirst the Sierra Pie de Palo (Mulcahy(IVIulcahy et al. 2014). We attribute reliablereliable intrusion age of Novillo dykes at 619 ±9-I_-9 Ma [4][4] these as parts of the overriding Famatina arc.|sotopic arc.Isotopic coeval with Chiapas E-MORBE-IVIORB amphibolites, Egersund ages of metamorphic imprints include: 429±2-434±7429iZ-434i7 Ma and LongLonrg> Range dykes. In addition, aa secondsecond ageage groupgroup (Lu/Hf(Lu/Hf mineral isochrones),isochrones), 460±6460i6 Ma (U/Pb(U/Pb monazite), of baddeleyite yielding 545 ±9-I_-9 Ma is consistent with an 404±7-422±8404i7—422i8 Ma (Rb/Sr mineral isochrones) and 402±2-402i2- earlier 40Ar-39Ar age suggestingsugggestinxg> recrystallizationrecrystallizationor orPb- Pb- 440±8440i8 Ma (Ar/Ar white mica). Combined with similar prepre-- lossloss duringdurinrg> greenschist facies metamorphic overprint. vious age data (Mulcahy(IVIulcahy et al. 2011; 2014) they clusterCluster around major age peaks at 404±2,4041-2, 437±2437i2 and 467±7.467i7. All

References isotopicisotopic systems used can be shown to date (re)crystal(re)crystal-- [1][1] Bingen et al., 1998, J. Geology 106,106, 565–574565—574 lisationIisation ofof metamorphicmetamorphic minerals.minerals. RecrystallizationRecrystallizationand/ and/ [2][2] Kamo et al., 1989, Geology 17, 602–605602—605 or nucleation ofof newnew metamorphicmetamorphic mineralsminerals waswas inducedinduced [3][3] Weber et al., 2018, Lithos 300–301,300—301, 177–199177—199 by transport of dissolved matter inin risingrising andand channelledchannelled [4][4] Weber et al., 2019, Geophys. Res. Lett. 2003—20112003-2011 metamorphic fluidsﬂuids accompanying accompanyinglocalised localisedthrusting. thrusting. ABSTRACTS 95

The exposed part of the wide wedge formed during The aim ofofthe the project is to bring together the geothergeother-- three stages: (1) partial subductionsubductionand andsubsequent subsequentex- -ex mal energy expertise inin BochumBochum withwith thethe geothermicallygeothermically trusion ofofthe the leadingleading edge of Cuyania (2)(2) exhumation byby idealideal conditions andand regionalregional geologicalgeological expertiseexpertisein inSan San normal faulting atat structuralstructural Ievelslevels andand (3)(3) dissectiondissectionof of Juan/NWArgentina. This Thisresulted resultedin inthe thenewly newlyimple- imple- the wedge by mid-mid— and upper crustal thrusts generated mented binational IVIaster’s Master‘sProgram Program(IVI.Sc.) (M.Sc.)„Applied „Applied inin the overriding plate, leadingleading to partial reburialreburial ofof thethe Geothermics“Geothermics” for interested students from Germany exhumed wedge. Scattered klippenklippen ofof thethe overridingoverriding arcarc and Argentina startingstartingin inwinter winterterm term2019/20. 2019/20.From Fromthe the were emplaced during stages 2 and 3. German side, it is hosted by RUB and GZB in cooperation with the Department of Applied Geothermal Energy at References TU Darmstadt. In Argentina, studentsstudents willwill bebe educatededucated Mulcahy S.R.,S.R.‚ Roeske S.M.,S.M.‚ et al. (2011)(2011) Tectonics, 30, 1-261—26 at the Universidad Nacional de San Juan(UNSJ). After Mulcahy S.R.,S.R.‚ Roeske S.M.,S.M.‚ et al. (2014)(2014) Tectonics, 33, 1–251—25 completion ofof thethe course,course, aa doubledouble master’smaster´s degreedegree willwill be awarded to the graduates. Both partner countries will contribute equally to the training ofofthe the students: lecture The new binational Argentinian-GermanArgentinian-German languagelanguage will be English, but inin addition toto professionalprofessional master‘s program „Applied Geothermics“ knowledge, intercultural competence will be promoted. (San Juan/Bochum) Therefore, the firstﬁrst semestersemester willwill bebe mainlymainly spentspent takingtaking German or Spanish courses at the home universities. Af-Af- S. WohnlichWohnlichl,1, N. MendozaIVIendozaZ,2, J. SchreuerSchreuer3,3, A. BanningBanningl,1, C. ter that, one semester inin Bochum and one in San Juan G. FernandezFernandezz,2, M. A. PittalugaPittaluga22 are planned, followed by the 4th semester for the masmas-- 11Ruhr—UniversitätRuhr-Universität Bochum, Applied Geology, Bochum, Germany ter‘ster’s thesis, either at UNSJ or RUB. Requirements include 2 2UniversidadUniversidad Nacional de San Juan, Departemento de Geologia, San a bachelor degree (or equivalent) in geosciences and a Juan, Argentina good command of the English language. 33Ruhr—UniversitätRuhr-Universität Bochum, Crystallography, Bochum, Germany good command of the English language.

Geothermal energy and the associated energy generagenera-- tion areare becomingbecoming moremore andand moremore relevantrelevant andand areare in-in- Hydro-geothermal circulation systemssystems inin thethe creasingly being exploited in Germany during the past Central Andes of Argentina— – TheThe exampleexample ofof years. In particular, thethe demanddemand forfor geothermalgeothermal energyenergy Pismanta inin new buildings for heating andand coolingcooling increasesincreases annu-annu- ally. Geothermal energy generation isis becomingbecoming increas-increas- S. WohnlichWohnlich1,J.Schreuer1,1, J. Schreuer1, I.I. HinzerHinzerl,1, M. AltherrAltherr1,1, I.I. inglyingly attractiveas asan anenvironmentally environmentallyfriendly friendlyalternative alternative SassSassz,2, R. SchäfferSchäffer22 inin the course of the German energy transition. AlthoughAlthough 11Ruhr-UniversitätRuhr-Universität Bochum, Institut fürfür Geologie,Geologie, MineralogieMineralogie undund Germany has no active geothermal geothermal zones zones (e.g., (e.g.,volca- volca- Geophysik, Bochum, Germany 22TechnischeTechnische Universität Darmstadt, Darmstadt, Germany nism) due to its geological conditions, considerableconsiderable ef-efforts have been made over the lastlast few years to develop The hydro-geothermal fieldfield of ofPismanta Pismantanear nearRodeo, Rodeo, geothermal energy. This has resulted in the develop- geothermal energy. This has resulted in the develop- San Juan, Argentina, isis locatedlocated inin thethe ArgentineanArgentineanAndes Andes ment of effectivenew newtechniques. techniques.These Theseexperiences experiencesare are where the Agua Negra river intersects with the North- bundled in Bochum at the Ruhr-Universität(RUB)Ruhr-Universität(RU B) and the South trending, depression of the Iglesia Valley (lowest InternationalInternational GeothermalGeothermal CentreCentre (GZB).(GZB). outflow 15001500 m).m). ltIt isis limitedlimited byby thethe mountainmountain rangerange Cor-Cor- Due to the location ofof ArgentinaArgentinaalong alongan anactive activeconti- conti- dillera Frontal (Agua Negra Pass, 4780 m) in the West and nental margin, where the subduction ofof thethe NazcaNazca plateplate the Precordillera Occidental (up to 3500 m) to the East. under the South American plate occurs, optimal condi- under the South American plate occurs, optimal condi- Due to ongoing tectonic activity, NorthNorth —– southsouth trendingtrending tions forfor geothermalgeothermal questionsquestionsand andinvestigations investigationsprevail prevail fault are connecting thethe deeperdeeper aquifersaquifers inin thethe PaleozoicPaleozoic here. The seismicity caused by tectonics and subducsubduc-- sandstones and shales ofofthe the Agua Negra Formation withwith tion asas wellwell asas thethe partlypartly stillstillactive activevolcanism volcanismin inlarge large Miocene and Pleistocene-Holocene agglomerates and parts of South America provides good points of contact parts of South America provides good points of contact sandstones, forming a variety of artesian springs on the for geothermal studies and possibilities ofof use.use. TheseThese dodo surface. At most of these artesian springs small and meme-- not only include near-surface and deep geothermal enen-- dium size mud volcanoes have formed, marking distinct ergy such as energy generation, heatingheatingand andcooling, cooling,but but exit points. In the vicinity of the thermal spa of BañosBafios also geothermal sources emerging at the surface (form(form-- Pismanta more than 50 artesian springs have been ideniden-- inging e.g., salars) inin order to investigateinvestigate thethe originorigin ofof thethe tifiedtified and andwater wateras aswell wellas assediment sedimentsamples sampleswere werecol- col- geothermal energy and to deepen the understanding of lected.lected. The water emerging there delivers temperatures the processes leadingleading to these sources. Recent political between 20°C - 43°C and varying hydrochemical concon-- developments led to a turnaround in renewable energies tents. The resultsresults of the geochemical and hydrochemihydrochemi-- inin Argentina includingincluding thethe acquisitionacquisitionof ofgeothermal geothermalen- -en cal analyses indicate deep hydraulic flowflow paths pathsfrom from ergy.e rgy. 96 ABSTRACTS

the central Andes, which occur in the sediments of the mediation ofof buildingsbuildings andand Civilcivil worksworks damageddamaged byby thisthis IglesiaIglesia longitudinallongitudinal valley via active overthrustoverthrust andand trans-trans- phenomenon. The study was conducted in the January- verse reverse faults. June 2018 period and includedincluded the acquisition ofof 35103510 gravimetric stations usingusing twotwo ScintrexScintrex CGSCG5 gravimetersgravimeters Hclirlnatit hlntk II|.I:._1raIIn:nn.' ."lll'Il'lIJ wurw uI'IlIL- .-I._u_1'-.|-.1 “(cum rnur I'rnm Ihr l’uw uniil I-imlw of nominal precision of 1 microGal and the measuremeasure-- L'I I_I'.|'.-.I-.'rr.|rj- [3 {im ment of an equivalent number of topographic stations E l. LI}. Hund. Hm' ment of an equivalent number of topographic stations

IÜH'JÜ l: l...1't'.n- using differentialGPS GPS(one (onebase baseantenna antennaand andtwo twomobile mobile Q5132 E l-_._I:!|:||"'III'.' antennas) with a Trimble TDL-450H-R4, whose accuracy '1- I'I |;i=.-i’-.'r'u E53 ".'nl..'.|n:i.' für}. after processingprocessing rangesranges fromfrom 1010 toto 1515 cm.cm. InIn total,total, thethe “-15." “(II-'I' l: “in Ihixlül: 1' ä II's-ll'u 'I'gl'2'|!.|' [I'J'lll-J F 51-" '1-'I gravimetric survey covered 98,420 linear meters; in the — I .|I.| I I'il'.‘.-.'in. r:- CH area, 2759 stations werewere acquired,acquired, includingincluding 854854 withwith CF“ 5|‘III||_‚' Hr-rln. f_'l.II.'l.'I"- '-'. "-|.:|! '.-'-f..:||--.'w- a separation ofof 55 metersmeters (4270(4270 lineallineal meters)meters) andand 19051905

L with a separation of of10 10meters meters(19500 (19500linear linearmeters). meters). EIHIII '- About 751 more stations werewere builtbuilt aroundaround thethe CHCH zone,zone, IIHII'r but with a separation ofof 100100 meters,meters, equivalentequivalent toto anan ad-additional 7510075100 linearlinear meters,meters, althoughalthough withwith lowerlower laterallateral Im“ resolution.resolution. The acquired data were corrected by instrumental drift, "III FII .HI j'hil |n...'|| The acquired data were corrected by instrumental drift, tides, latitude,latitude,Bouguer Bouguerslab slaband andby byterrain. terrain.Additionally, Additionally, we apply the atmospheric correction andand buildingbuilding cor-correction.rection. AsAs aa result,result, thethe completecomplete BouguerBouguer anomalyanomaly andand Urban micro-gravity: study of irregularities inin itsits derivatives were were genetated. genetated. The Thesubsidence subsidencemodel model the basement of QuerétaroQueretaro city (Mexico) and along fault zones was constructed; the displacement of subsidence risks the surface and possible areas to develop faults was obob-- tained. Finally, the irregularirregular hydrological basement was 1 2 1 V. YutsisYutsisl,, J. A. Arzate FloresFloresz,, D. A. VelásquezVelasquezl,, A. DíasDias reveledreveled and the map of subsidence riskrisk generated. 2 1 1 de LeónLeonz,, D. E. TorresTorresl,, M. EspinosaEspinosa1 Authors acknowledge the financialfinancial support supportof ofthe the 11InstitutoInstituto PotosinoPotosino dede InvestigacionInvestigaciónCientl’ Científicafica y Tecnologica, y Tecnológica,Geocien- Geocien- UNAM-IPICYT project IPI-DV-FMT-VINC-019IPI-DV—FMT—VINC-019 cias Aplicadas, San Luis potosí,potosi, Mexico 22UniversidadUniversidad Nacional AutónomaAutonoma de México,Mexico, Centro de geociencias, Querétaro,Queretaro, Mexico Full crustal scale deformation structuresstructures inin There are various types of geological risks that can dada-- the Central Andean foreland revealed by mange infrastructure and security of the civilian populapopula-- recent seismotectonic activity. tion. FromFrom thethe mostmost extreme,extreme, suchsuch asas seismicseismic oror volcanicvolcanic recent seismotectonic activity. that can be generate immediate danger inin inhabited arar-- M. ZeckraZeckral,1, G. Aranda VianaVianaz,2, E. J. M. SuttiCriadoz, Criado2, A. eas, to the „persistent risks“,risks”, such as subsidence of the ArnousArnous3,3, F. KrügerKrügerl,1, M. R. StreckerStreckerl,1, F. HongnHongn22 landIand by extraction ofof waterwater fromfrom thethe subsoil,subsoil, whichwhich oc-oc- 11UniversityUniversity of Potsdam, Institute forfor Geosciences,Geosciences, Potsdam—Golm,Potsdam-Golm, cur slowely and imperceptibly but butwhich whichnevertheless nevertheless Germany 2 can cause collapse infrastructure due to ground failures 2UniversidadUniversidad Nacional de Salta, CONICETCONICET— – IBIGEO, Salta, Argentina 33UniversidadUniversidad Nacional de Tucumán,Tucuman, Tucumán,Tucuman, Argentina that may generate. The main cause ofofthe the demage to the infrastructureinfrastructure are the diferential soilsoil movementsmovements causedcaused The orogenic history of the Central Andean Foreland incorporates a by irregularities inin thethe rockyrocky basementbasement thatthat containcontain bothboth superposition ofof multiplemultipletectonic tectonicstages stageswith withdiverse diversespatial spatialimpact. impact. the sedimentary fillfill andand thethe waterwater reservesreserves fromfrom whichwhich InIn particular thethe Santa—Barbara-System,Santa-Bárbara-System, aa morpho-strucuralmorpho-strucural provinceprovince of the NW Argentine Andes,Andes, demonstrateshowdemonstrateshow inheritedinherited structuresstructures the water supply isis extracted. InIn the QuerétaroQueretaro city, are recycled and overprinted, while presenting aa highhigh crustalcrustal seismic-seismic- demage to the civilCivil structure caused by subsidence of ityity raterate of significantsignificant magnitudemagnitude upup toto M7.M7. soil began to be documented in the 1980s,19805, although the Recently, the need for a better understandingunderstanding ofof thethe phenomenon of cracking has been observed in urban arar-- neotectonic settingat atthe theAndean Andeanmountain mountainfront frontbe-- be eas of cultivationdecades decadesearlier. earlier. came obvious in 2015, when a Mw 5.7 earthquake hit the The present work presents the results of a micro-gramicro-gra-- town of ElEI GalpónGalpon in the Salta Province. For this reason,reason, vimetry study in the urban area of the QuerétaroQueretaro City, we installed a local seismological network around the derived from an agreement with the Municipal Planning estimated epicenter epicenterand andnoteworthy noteworthygeological geologicalstruc- -struc InstituteInstitute (IMPLAN) (IMPLAN)of ofQueretaro Querétaroto evaluate to evaluatethe con- the con- tures. We were able to collect 15 months of continuous ditions ofof thethe subsoilsubsoil andand thethe distributiondistributionof ofthe theareas areas data from 13 stations showingshowing numerousnumerous earthquakesatearthquakesat of risk of subsidence in the area of the Historic Center different depthdepth levels.levels. EventsEvents fromfrom crustalcrustal seismogenicseismogenic (CH)(CH) and surrounding colonies. The study isis focused on zones can be clearly distinguished from fromintermediate intermediate providing detailed technical information that thatallows allows (~200km)(“200km) and very deep (~550(“550 km) inter-slabinter-slab seismicity. carrying out activitiesof ofplanning, planning,conservation conservationand andre-- re ABSTRACTS 97

The spatial distribution distributionof ofshallow shallowearthquakes earthquakesdis- dis- plays an extraordinary vertical extensionextension ofof thethe seismo-seismogenic zone in the earths crust. In this study we show,Show, forfor-- mer ideas of the localIocal geometry of tectonic structures inin the Santa-Bárbara-SystemSanta-Bärbara-System extend down tot0 the Moho-IVIoho- discontinuity at at approximately approximately40 40km; km;this thisis twice is twiceas as deepdeepasthoughtbe as thought before.ﬁwe. Besides the separationof spatial spatialseismicity seismicityClusters, clusters, the identificationidentiﬁcation of ofseismotectonic seismotectonicstructures structuresand andtheir their geometries is crucial for understandingunderstandintg> the complex multi-stage evolutionevolutionof ofthe theforeland. foreland.The Thestudied studiedregion region comprises Quaternary structures as wellweII as reactivated inheritedinherited structures from a long-lasting,Iong-Iasting, alteringaltering tectonictectonic history. Further, the integration ofof geomorphologicalgeomorphological andand applied geophysical analyses deepens the understanding of these structures to shallower depths. In particular, seismic-refraction andand 2D2D electricalelectrical resistivityresistivitytomogra- tomogra- phies were carried out for a number ofofsuspected suspected surface faultfauhlocaüons. locations. The presented study complements the generalcomgeneralcom-- prehension about a part of the Andean foreland, which incorporatesincorporates geological, lithological,Iithological, andsmall- and large-Iarge- scale tectonic transition zones.zones.

I.’ , Mw 5.7 c5 m i

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ankam-II- . . . : '. Depth [km] _|‚ . _IﬂnHHk—li .15'an "um! de Tucuman i] . -.. i w. . . i ;_. i"; 1- -_ _ EI

1,! Eﬂh

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_ - . ' .1 _‚ Turnus d: Run Hündin 25 km i

98 INDEXINDEX

A. Bernhardt 48 Author indexindex A. Bilmes 3232,34,39,44,59, 34, 39, 44, 59 S. A. Binnie 62 W. Bloch 3333,80, 80 B. Böckel 51 A B. Boltshauser 77 F. R. Abrantes JúniorJünior 30, 31 B.B.Bookhagen Bookhagen 29,29,86 86 M. Accioly Teixeira 28 J. Bott 48,48,53,76,89 53, 76, 89 S. Agostini 67 A. Brauer 87,87,91 91 L. Aguirre 31 S. Bredemeyer 43 H. Agurto-Detzel 59 M. Brenner 56,56,70 70 M. Agusto 56 J. A. Brod 29 J. M. Albite 74 E. Brown 65 A. L. S. Albuquerque 34 C. Bucarey Parra 43 E. A. Alemán-GallardoAIemän-Gallardo 73 J.J.Bucher Bucher 32,32,34,39,44,50,59 34, 39, 44, 50, 59 B. A. Alemao Monteiro 35 P. Busch 60 A. R. Alkimin 35 R. Alonso 86 C S. Alonso Torres 80 M. Caballero 65 U. Altenberger 75 M. Cacace 48 M. Altherr 95 S. Caetano-Filho 68 A. Alvarado 59 P. J. Caffe 78 C. Alves de Moraes 28 J. Campos 81 J. C. Alzate 63 M. C. Campos 34 K. Amorim 68 A. Carballo 65 R. Anczkiewicz 94 A. Cardona Benavides 80 M. Angeletti 28 A. Cardoso Ribeiro 31 G. Antonio 29 J. Carrillo Lopez 3434,37, 37 N. Antonoglou 29 M. E. Cerredo 74,74,78 78 E. AragónAragön 48, 50 Y. Cervantes Guerra 35 J. M. Aragon Paz 60 P. Charvis 59 G. Aranda 42, 96 A. O. Chaves 35 P. A. Aranha 52 D. Chew 67 M. A. Arecco 73 C. Chiessi 34,34,36 36 A. Arnous 96 A. Cisneros de LeónLeön 93 J. A. Arzate Flores 96 S.S.Cohuo Cohuo 70 G. Asch 83 D. Comte 83 D. AvendañoAvenda'no 65 O. Conrad 54 T. A. Avilés-EsquivelAvile’s-Esquivel 29 S. Constable 29 E. Contreras 49 B E. Contreras-Reyes 3636,49,57,71, 49, 57, 71 S.S.Back Back 38 F. CórdobaCÖrdoba 87,87,91 91 A. Bahr 34 N. Cornejo 37 C. Balbis 29 A. Correa-Metrio 70 F.I. Ballestrini 89 V. Cortassa 38 A. Banning 80, 95 E. J. M. Criado Sutti 41 H. Barcelona 56 E. Cristallini 38 S. Barrientos 57, 71 S. Crivellari 36 S. Barrientos Parras 30 F. W. Cruz 34 M. Barrionuevo 45 J. CuitiñoCuiti'no 32,32,39 39 G. Basilici 3030,, 3131,, 85 D K. Bataille 31 D R. Becchio 73, 78 S. J. Daly 67 S.S.Beck Beck 59 T. da SilvaSiIva Marinho 85 J. Bedford 3232,, 57, 69 C. J. de Hoog 67 H.H.Behhng Behling 28 A. de laTorreIaTorre 29 G. Bernal 48 L.L. D‘EliaD’EIia 32, 34, 3939,, 44, 59 INDEXINDEX 99

C.C.E.deIPapa E. del Papa 3939,, 57 F. Gonzalez 49 Z.Z.Deng Deng 32 G. Gonzalez 90 B. Derode 81 iGonzalezî González 48 A. DíasDias de LeónLeÖn 96 R. González-GuzmánGonzalez-Guzman 84, 93 D. DíazDiaz 68 G. GonzálezGonzalez L. 49 D. DíazDiaz Alvarado 68, 74 R. Green 81 R. Dietrich 60 I.I. Grevemeyer 71 M. Do Campo 39 A. Groh 60 S. Dosch 40 A. Guillermo Martinelli 85 T. J. Dunai 62 A. Güntner 29 H. J. Gursky 35 E D. GutiérrezGutierrez 50 C. GuzmánGuzman 38 B. Edwards 59 J. O. Eisermann 4040,, 47, 72 H L. I. ElíasElias 4141,, 42 T. Elliott 67 P. C. Hackspacher 55 J. Enzweiler 68 C.C.Häggi Häggi 36 L. Escalante 42 S. Hainzl 82 M. Espinosa 96 K. Hannemann 57 B. Härtel 50 F F O. Heidbach 69 B. Heit 81 P. Fawcett 65 S. Held 37, 68 R. Feal 41 N. HernándezHernandez 38 R. Feo 32, 39 I.I. Hernando 50 C. G. Fernandez 95 I.I. Hinzer 95 A. Fichtner 43 G. Hoke 51 S. Figueroa 42 B. Holstein 51 C. Flores-LunaFIores-Luna 29 F. Hongn 39, 41, 42, 96 J. Folesky 42 C. Hoorn 52 Y. Font 59 N. Höppner 36 L. Franco 43 J. L.L. Hormaechea 60 J. R. Franzese 32, 34, 39, 44, 59, 69 H. A. Horn 5252,, 72 D. Frei 84 M. Horwath 60 O. Frei 50 M. Hoskins 59 A. Freundt 56 N. Hovius 40 M. C. Frisicale 28 C. Hübscher 53 T. Fuentes 50 G I F. Ibarra 53 A. Gaete 43 Y. Gao 43 J M. GarcíaGarcia 32, 34, 39, 4444,, 59, 63 V. H. GarcíaGarcia 41 U. Jenchen 73 J. Geersen 44 T. John 33, 82 M. E. Ghidella 69 J. Julve 45 M. Ghiglione 41 L. Giambiagi 41, 4545,, 51 K M. Giba 45 J. Kallmeyer 56 U. A. Glasmacher 4646,, 55 A. Kammer 63 J. Glodny 94 J. Glodny 94 M. R. Kaplan 76 J. Goff 89 M. Kappelsberger 60 P. L. Göllner 40, 4747,, 58, 72 M. Karl 55 M. L. Gomez Dacal 4848,, 53, 76, 89 S. Kasemann 36, 68, 78, 92 A. M. Gomez Garcia 48 S. Katsev 56 D. F. GómezGömez GonzálezGonzalez 66 L.L. A. Kirstein 67 E. Gómez-TreviñoGömez-Treviﬁo 29 D. Kläschen 60 100100 INDEXINDEX

L. G. Knauer 35 R. S. Molina-GarzaMoIina-Garza 62 T. Kohl 68 G. Monsalve 48 S.S.KoHenz Kollenz 46 T. Montenegro 88 S. KöllnKöIIn 54 C. Montero-LópezMontero-Lopez 41, 57 H.H.Kopp Kopp 5454,, 57, 60, 71 P. N. Morales Hernandez 63 O. Korup 79 M. Moreno 32, 69 S. Krastel 56 S. Mulitza 34, 36 F. Krob 55 J. N. MuñozMu'noz 65 F. Krüger 41, 96 A. Müting 90 H. Kuhnert 34, 36 M. Mutti 88 C. Kujawa 43 J. Kummerow 33, 42, 83 N S. Kutterolf 5656,, 70 J. M. Nocquet 59 L C. Novoa 31 D. Nürnberg 53 S. LadevèzeLadeveze 84 M. C. Lamberti 56 O C.C.Lana Lana 35 J. Oliveira 64 D. Lange 32, 54, 5757,, 71 P. W. Oliveira 64 A. T. Lapiana 39, 57 O. Oncken 69, 83, 90 G. Lauer-Dünkelberg 58 R. Ondrak 38, 41 T. F. Lawton 62 L.L. J. OrdoñezOrdoﬁez 64 Y. Lee 58 G. Orozco 65 L. Lehmann 80 B. Ortega 65 S. Leon-Rios 59 P. OyhantçabalOyhantgabal 82 S. Liu 61 D. A. Lopez 62 Pp M. LópezLopez 32, 34, 39, 44, 59 M. Lopez de Luchi 75 S. Padilla-RamírezPadiIIa-Raml’rez 93 A. Lossada 45, 51 T. PánekPanek 79 S. Lozano 65 C. Parica 6666,74,78, 74, 78 F. Lucassen 78, 92 G. D. Patarroyo Camargo 64,64,66 66 V. Lüders 83, 88 A. Paul 34,34,67 67 L. Lupo 87, 91 G. Paula-SantosPauIa-Santos 68 C. Lynner 59 F. PaullierPauIIier 82 M. Pavez 68 M P. Payrola 39 A. C. Pedraza De Marchi 69 B. MaM Q) 60 A. C. Pedrosa Soares 92 L. Macario-Gonzalez 70 C..Pe Peñaﬁa 31,31,69 69 A. MagalhãesMagalhäes 52 R.. Perdomo 60 A. Marconato 85 R.. E. Pereyra 46 E. Marderwald 60 L.[-3020 PérezPerez 56,56,65,70 65, 70 J. C.C MartínezMartinez 28 M. A. Pérez-FloresPerez-Flores 34,34,37 37 R. MartínezM artI’nez 65 M. Perner 55 H. J. Massonne 28 F. Petersen 57,57,71 71 M. Mazzoni 38 I.I. Petrinovic 29,29,50,71,72 50, 71, 72 C. Meeßen 48 A. Pierra 35 A. Meixner 68, 78 J. PindellPindeII 62,62,93 93 A. Meltzer 59 H. Pingel 39,39,86 86 L. Mendoza 60 I.I. Pintea 72 N. Mendoza 95 M. A. Pittaluga 95 J. Mescua 45 E. Pitzke 72 A. Meyer 56 B. PlessenPIessen 91 P. Michael 61 J. PohlnerPohIner 94 J. P.P. Milana 61 R. Portilho-Ramos 36 M. Mohr 45 M. Prange 34,34,36 36 J. Mohren 62 INDEXINDEX 101101

F. Prevosti 84 J. Schreuer 95 C. Prezzi 53, 7373,, 76, 89 L.L. Schrott 61 C. G. Puigdomenech 77 F. Schulte 79 B.B.Schurr Schurr 32, 33, 8080,, 82, 83 R A. Schwalb 56, 65, 70 D. Schwertfeger 80 J.J.Rakau Rakau 42 C. Sens-Schönfelder 81 J. A. Ramirez-Fernandez 73 S. A. Shapiro 33, 42 J.J.Rausch Rausch 56 C. Siegel 81 M. Regnier 59 M. Silva 35 M. Remesal 66, 7474,, 78 C. Sippl 44, 80, 8282,, 83 E. M. Renda 77 K. SlezakSIezak 74 F. Reyes CórdovaCördova 74 M. V. Soares Theodoro 30, 31 V. Reyes-Ortega 29 E.E.Sobe| Sobel 57 E.rn_<_-n . Ribacki 75 S. Sobolev 61 A.. Richter 60 L.L. Solari 84 A.. Rietbrock 59 G. Sosa 8282,, 88 U.. RillerRiIIer 40, 47, 54, 58, 72, 79 H. Soto 32, 83 B.. Ritter 62 L.L. Soto-Cordero 59 A.. RodríguezRodriguez 35 S. Spagnotto 45 C.. Rodriguez Piceda 76 S. Spagnotto 45 R. A. Spikings 67 F. Rolandone 59 J. Spoturno 82 A.. W. Romano 35 K. P. Stanek 50 R.. L. Romer 83 M. Stockhecke 65, 70 F.THJUJ>THÖJ>UDCJ>J> RomérioRomerio Abrantes JúniorJünior 85 D. F. Stockli 46, 55 L. Romero 65 M. Stoltnow 83 M. Romero 76 W. Strauch 56 S. Rosas 77 M. R. Strecker 96 E. A. Rossello 38, 46 M. Strecker 38, 39, 41, 42, 53, 76, 86 F. Ruiz 73 J. A. Strelin 76 M. Ruiz 59 M. Sudo 94 S. Ruiz 83 J. Suriano 45 V. Ruiz GonzálezGonzalez 77 E. J. M. SuttiCriado Criado 96 S T T A. Saballos 56 F. Tapia 41 D.D.Sachse Sachse 40 S. Tarquini 84 F. Salani 74, 78 A. Tassara 45, 69 D. Salazar 89 F. Tassi 56 P. Salazar 33 M. D. Tazzo 84 G. Sampaio 36 W. Teixeira 85 J. San Martin 43 M. V. Theodoro Soares 85 C. Sarchi 78 S. Thrastarson 43 I.I.Sass Sass 95 F. TilmannTiImann 43, 81, 83, 90 J. Saul 90 R. TjallingiiTjaIIingii 91 S. Savi 86 C. Tocho 48 I.I.Savov Savov 67 S. Tofelde 86 A. Sawakuchi 36 P. Toledo 81 P. Schaaf 84 R. Tomezzoli 38 R. Schäffer 95 D. E. Torres 96 M. Scheck-Wenderoth 48, 53, 76, 89 G. Torres 8787,, 91 E. Schefuß 36 A. M. TréhuTre’hu 49, 60, 87 M. Scheinert 60 R.R.Tnndade Trindade 68 T. Schildgen 86 W. Trindade 52 E. Schill 34, 37, 68 R. Trumbull 75 A. Schmitt 84, 93 S. J. Turner 67 C. Schneider 45 E. Schönfeldt 79 102102 INDEXINDEX

V S. Zapata 57 M. Zeckra 96 P. ValVaI 51 Y. ZhangZhanrg> 36 V. Valencia 84 M. Ziegler 69 B. Valero 65 M. Zimmer 43 M. Vallati 88 A. van den Kerkhof 82, 88 D. P. van Herwaarden 43 C. R. van Staal 94 A. Varela 34 G. B. Vargas 35 G. Vargas 89 R. VásconezVäsconez Garcia 31, 85 S.E. Vazquez Lucero 89 F. Velasco-Tapia 73 D. A. VelásquezVeläsquez 96 M. L. Vélezvelez 56 I.I. M. Venancio 34 S. Venturi 56 E. Vera 49 F. Vera 31, 90 P. Victor 90 A. Vidal 91 C. E. Vieira 35 N. Vigide 56 P. Vignoni 87, 91 F. VilelaViIeIa 92 H. VizánVizän 77, 89 I.I. Voigt 36 G. Vujovich 94

T. Walter 43 B. Weber 84, 93 P. Weis 83 J. Weiss 42 K. Wemmer 82 J. Werne 65 A. Wickert 86 J. Wickert 29 P. Wigger 33 A. Willner 94 D. Winocur 56, 79 G. Winterleitner 88 H. Wittmann 86 S. Wohnlich 61, 95

A. L. Ximenes 35

Y D. Yagupsky 56 V. Yutsis 96

C. B. Zaffarana 77 INDEXINDEX 103103 104104

TERRA NOSTRANOSTRA Schriften der GeoUnion Alfred-Wegener-StiftungAIfred-Wegener-Stiftung .3. „131.. Übersicht über die erschienenen HefteHefte 2005-2018 um... VolumesVolumes pub/ishedpublished 2005-2018

GeOUnlon Gesamtübersicht über die Hefte seit 19931993 Alfred—Wegener—Stiftung All volumes pub/ishedpublished since 1993: http://www.geo-union.de/terra-nostra.htmlhttp://www.geo-union.de/terra-nostra.htm/

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