DOCSLIB.ORG

The Major Eruption of the Cerro Blanco Volca

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Major Eruption of the Cerro Blanco Volca EGU2020-5038 The 4.2 ka cal BP major eruption of Cerro Blanco, Central Andes ICTJA J.L. Fernandez-Turiel1, F.J. Perez-Torrado2, A. Rodriguez-Gonzalez2, N. Ratto3, M. Rejas1, A. Lobo1 ¹Institute of Earth Sciences Jaume Almera, ICTJA, CSIC, Barcelona, Spain ([email protected], [email protected], [email protected]) 2 Instituto de Estudios Ambientales y Recursos Naturales (i–UNAT), Universidad de Las Palmas de Gran Canaria (ULPGC), Las Palmas de Gran Canaria, Spain ([email protected], [email protected]) 3 QUECA Universidad de Buenos Aires, Instituto de las Culturas (UBA-CONICET), Facultad de Filosofía y Letras, Buenos Aires, Argentina ([email protected]) Introduction Results Conclusions CdP CB BdF The major eruption of Stratigraphic summary Bimodal particle size Geochemistry ● These results change the paradigm of Holo- CB23 the Cerro Blanco Volca- cene volcanism of southern Puna in the Cen- Sub- Sequence Unit Lithofacies and interpretation Mineralogy unit 4410-4150 a cal BP CB 3 nic Complex (CBVC), in Bolsón de BdF1 Alternating layers of moderate-poorly sorted, dacitic glass >> plagioclase, biotite, amphiboles, 2 tral Volcanic Zone of the Andes (CVZ). Fiambalá pumice lapilli and ash. Plinian fall deposit. quartz >> magnetite, ilmenite, apatite, the Central Volcanic titanite BdF Cerro Blanco CB3 4 Alternating layers, 3-30 cm thick, of siliceous sinter. amorphous silica (postcaldera) Deposits of hot springs. ● CBVC generated the largest documented Zone of the Andes, NW ca. b 7820 AP 3 Poorly defined decimetric-scale stratified deposits, poorly glass >> feldspars, quartz, biotite, to very poorly sorted, with decimetric angular rhyolitic magnetite, ilmemite >> apatite, allanite- eruption during the past five millennia in the ca. 4200 a cal AP Argentina, dated at blocks in rhyolitic lapilli and coarse ash matrix deposits. epidote, zircon CB 3 Block-and-ash deposits. 2 CVZ and around the world. CB 3 4410–4150 a cal BP, is 2 Poorly to well–defined layers, 3-30 cm thick, white, 4440-4240 a cal BP 2 20 µm ca. 1700 a cal BP rhyolitic lapilli and ash deposits. Fallout and (?) SEM image of distal thin-bedded ash (CB 1 sub-unit) the most important of phreatomagmatic deposits. 2 CB 1 Crystal poor, very vesicular, rhyolite lava domes. the three major Holoce- Ignimbrites of Cerro Blanco CB2 3 Unstratified, matrix-supported, moderate to poorly sorted glass >> feldspars, quartz, biotite, CB 3 (≈15 km3) ne felsic eruptive events (syncaldera) rhyolitic ignimbrite with clasts dominated by coarse magnetite, ilmenite > clinopyroxene, 2 pumice lapilli. Pyroclastic density current (PDC) deposits. orthopyroxene, amphiboles > allanite- par�culate cored cluster epidote, muscovite, titanite, zircon identified in the sou- 2 Unstratified rhyolitic ash. Plinian fall deposit. core par�cle thern Puna (Fernan- 1 Alternating layers, 1-3 cm thick, some of lapilli and some CdP of ash. Rhyolitic Plinian fall deposit. shell par�cle dez-Turiel et al., 2019). CB1 Poorly stratified lithic-rich breccia. Block-and-ash deposit. glass >> feldspars, quartz, biotite, (precaldera) magnetite, ilmenite Cueros de CdP2 1,2 Unstratified, matrix-supported, moderate to poorly sorted glass >> feldspars, quartz, biotite, Purulla ignimbrite with clasts dominated by coarse pumice lapilli magnetite, ilmenite > apatite, allanite- Two different composi- 70º 60º W 67°50' 67°45' 67°40' W in CdP21 and lithic-rich CdP22. Pyroclastic density current epidote, muscovite, titanite, zircon (PDC) deposits. tions of plagioclases, bio- a NVZ N a Particle size bimodality is interpreted as evidence of particle aggre- tite, and Fe–Ti oxides ob- CdP1 Alternating layers, 1-10 cm thick, some of lapilli and some glass >> feldspars, quartz, biotite, gation in the eruptive plume, forming cored ash clusters that typica- served in the CB2 syn–cal- ENC of ash. Rhyolitic Plinian fall deposit. magnetite, ilmenite > amphiboles, lly break on impact with the ground. The resulting fallout deposit is dera sub–units indicate La Paz a clinopyroxene > apatite, allanite-epidote, CVZ PSBC muscovite, titanite, zircon Plinean fall deposits made up of core particles of hundreds of microns in size and shell mixing of two magma 1 3 particles of tens of microns in diameter that covered the former. batches during the erup- DRE volume from VOGRIPA-LAMEVE, except for Toba (Costa et al., 2014) and Cerro Blanco CB1-23 (≈170 km ) CB1 tion. 20º S ARGENTINA Altiplano-Puna Central SVZ CB33 plateau 26°45' S Volcanic AVZ CB34 Zone CBC Isopach maps Eruption modelling CB31 ● The 4.2 cal ka Cerro Blanco eruption of mag- 3 RC 65º 60º W Bolivia 55º W a Bolivia a Isopach maps (m) for the Paraguay nitude 7.0 erupted ~170 km tephra over b CB32 Jujuy Paraguay Cueros de Purulla Chile b Brazil CB1-2 fall deposits of Pacific Ocean 2 3 Salta Nevado de Tres Cruces CBVC: (a) showing up to Formosa ~500,000 km , and ~15 km ignimbrites. Cerro Blanco CB23 CB22 Argentina 25º the inferred area of 0.10 Uruguay Volcanic Complex Chile Atlantic Ocean m isopach, and (b) in the 26°50' CB116 Chaco Paraguay 27 km 30º Source: Esri, DeLorme, USGS, NPS; Source: Esri, DigitalGlobe, 1 0.80 0.80 sampled area indicating 10 cm 1 0.60 0.50 ● The ash deposits of this eruption are exten- 0 5 km 23.6 m - Tucumán 0.40 Misiones GeoEye, Earthstar, Geographics, CNES/Airbus DS, USDA, USGS, 0.30 Catamarca the measured thickness. AeroGRID, IGN, and the GIS User Community 0.20 CB118 b 0.10 (c) Semi–log plot of thic- Santiago del Estero sive regional chronostratigraphic markers in CB114 Corrientes 5 CB 2 22 km 1/2 2 34 km - 12.5 m kness vs. (area) shows 0 500 Brazil 11.4 m - La Rioja Not to scale the best fit model (Wei- Laguna Mar Santa Fe km 30º S South America, and the cryptotephra for the Santiago Chiquita Buenos Aires Sources: Esri, USGS, NOAA b CB47 0 bull) for isopach adjust- CB22 2.0 m 196 km San Juan Uruguay CB31 Córdoba Entre Ríos ment. 68º 67º 66º 65º 64º W Fig. 12d 0 100 200 South Hemisphere. CB 1 CB46 km 2 CB45 San Luis Sources: Esri, USGS, NOAA CB21 Mendoza b Southern Puna Salta Bolsón de Fiambalá sequence reworked 1.5 200 km 208 km b 0.10 c 26º S Cafayate Cerro Blanco sequence 0.08 Antofagasta 0.20 Cueros de Purulla sequence de la Sierra 0.30 ● Further interdisciplinary research should be CB1 1.0 Tolombón CB22 Cafayate CB 2 CB44 Antofagasta Eruptive center 2 de la Sierra 204 km 0.40 thickness (m) ARGENTINA CdP CB 1 CB 1 0.50 performed to analyse impacts in local environ- El Peñón CB33 2 0.30 2 0.5 CB40 CHILE Tucumán 0.60 CB01 0.50 Santa María 169 km 0.80 sqrt (area) (km) 155 km 169 km 204 km 204 km 0.30 1 0.80 Tafí del Valle 11 km 0.50 0.60 100 Calchaquí Valleys 1.82 ments and local communities. CB34 0.20 Tafí del Valle 0.32 CBVC 0.35 0.68 1 2.38 0.0 0.57 1 Santiago 0.60 San Miguel de 0.20 1 1.50 CB32 0.60 27º Las Papas 0.40 Tucumán del Estero 2 m 0.34 NTC CB50 1 CB39 CB54 2 Catamarca CB37 200 km p (deposition > 1 kg/m Termas de 164 km 370 km 0.40 Bolsón de 0 155 km CB38 Fiambalá Aguilares Río Hondo CB 2 11,000 daily eruptive events 2 155 km CB41 Fiambalá CB53 Santiago 0.15 0 50 0.20 del Estero (~30 years of wind data) Fiambalá 172 km 338 km References km Santiago del Estero 0.10 La Rioja Modelled with Tephra2 0 50 100 Fernandez–Turiel, J.L., Perez–Torrado F.J., Rodriguez–Gonzalez A., Saavedra J., km Plume height 27,000 m (a) Holocene volcanic centres in the Andean Central Volcanic (a) Cerro Blanco Volcanic Complex showing El Niño 208 km Carracedo J.C., Rejas M., Lobo A., Osterrieth M., Carrizo J.I., Esteban G., Gallardo Zone (data from Global Volcanism Program); NVZ, Northern Caldera (ENC), Pie de San Buenaventura Caldera J., Ratto N., 2019. The large eruption 4.2 ka cal BP in Cerro Blanco, Central Vol- Volcanic Zone; CVZ, Central Volcanic Zone; SVZ, Southern Vol- (PSBC), Robledo Caldera (RC), and Cerro Blanco Cal- canic Zone, Andes: Insights to the Holocene eruptive deposits in the southern canic Zone; and AVZ, Austral Volcanic Zone. (b) Studied sec- dera (CBC); (b) stratigraphic units in the Cerro Puna and adjacent regions. Estudios Geologicos, 75, e088. http://estudios- Secondary thickening We hypothesized that secondary tions and eruptive centres (CdP, Cueros de Purulla; CBVC, Blanco Volcanic Complex. vent geol.revistas.csic.es/index.php/estudiosgeol/article/view/982/1200 PDC deposits fall deposits thickening is related to the effect of Cerro Blanco Volcanic Complex; NTC, Nevado Tres Cruces). south of Cerro Blanco east of Cerro Blanco the topographically induced turbu- CB 2 Costa A., Smith V.C., Macedonio G., Matthews N.E., 2014. The magnitude and 50 cm 2 lences in the disaggregation, e.g., CB 1 impact of the Youngest Toba Tuff super-eruption. Frontiers in Earth Science, 2. 2 the breaking of lee waves, genera- reworked topsoil - light brown silt to sand, or stony dating sample ted by winds passing over elevated 25 CB 2 palaeosol CB54 topography beneath the eruption 2 section number and distance to vent Acknowledgements 370 km plume, and to a minor effect of ups- 1.0 m loess deposits 0 Financial support was provided by the ASH and QUECA Projects (MINECO, CGL2008–00099 and CB 2 lope moisture transport by easterly 2 4880-4780 a cal BP colluvial deposits CB 3 ignimbrite 2 atmospheric flow.
Load more

Recommended publications
  • A Chronology of Middle Missouri Plains Village Sites
    Smithsonian Institution Scholarly Press smithsonian contributions to botany • n u m b e r 9 2 Smithsonian Institution Scholarly Press TaxonomicA Chronology Revision of of the MiddleChiliotrichum Missouri Group Plains Villagesensu stricto Sites (Compositae: Astereae) By Craig M. Johnson Joséwith Mauricio contributions Bonifacino by Stanley A. Ahler, Herbert Haas, and Georges Bonani SERIES PUBLICATIONS OF THE SMITHSONIAN INSTITUTION Emphasis upon publication as a means of “diffusing knowledge” was expressed by the first Secretary of the Smithsonian. In his formal plan for the Institution, Joseph Henry outlined a program that included the following statement: “It is proposed to publish a series of reports, giving an account of the new discoveries in science, and of the changes made from year to year in all branches of knowledge.” This theme of basic research has been adhered to through the years by thousands of titles issued in series publications under the Smithsonian imprint, com- mencing with Smithsonian Contributions to Knowledge in 1848 and continuing with the following active series: Smithsonian Contributions to Anthropology Smithsonian Contributions to Botany Smithsonian Contributions in History and Technology Smithsonian Contributions to the Marine Sciences Smithsonian Contributions to Museum Conservation Smithsonian Contributions to Paleobiology Smithsonian Contributions to Zoology In these series, the Institution publishes small papers and full-scale monographs that report on the research and collections of its various museums and bureaus. The Smithsonian Contributions Series are distributed via mailing lists to libraries, universities, and similar institu- tions throughout the world. Manuscripts submitted for series publication are received by the Smithsonian Institution Scholarly Press from authors with direct affilia- tion with the various Smithsonian museums or bureaus and are subject to peer review and review for compliance with manuscript preparation guidelines.
    [Show full text]
  • Dynamics of Large Pyroclastic Currents Inferred by the Internal Architecture of the Campanian Ignimbrite Claudio Scarpati*, Domenico Sparice & Annamaria Perrotta
    www.nature.com/scientificreports OPEN Dynamics of large pyroclastic currents inferred by the internal architecture of the Campanian Ignimbrite Claudio Scarpati*, Domenico Sparice & Annamaria Perrotta Large ignimbrites are the product of devastating explosive eruptions that have repeatedly impacted climate and life on global scale. The assemblage of vertical and lateral lithofacies variations within an ignimbrite sheet, its internal architecture, may help to determine how the parental pyroclastic current evolves in time and space. The 39 ka Campanian Ignimbrite eruption, vented from Campi Flegrei caldera, laid down a thick ignimbrite over an area of thousands of km2. A detailed reconstruction of the vertical and lateral variation of the seven lithofacies recognised in the ignimbrite medial sequence constrains the behaviour of this event. The pyroclastic current fowed over a wide area around Campi Flegrei without depositing (bypass zone), and inundated a huge area during most of the paroxysmal, waxing phase, emplacing a mainly incipiently- to strongly- welded ignimbrite. Following this waxing phase, the leading edge of the current retreated back towards the source as the current waned, impacting a progressively smaller area and leaving an unconsolidated ash and lapilli deposit, later lithifed. Our study illustrates how large pyroclastic currents can evolve in time and space and the importance of both internal (eruptive and transport mechanisms) and external (topography, surfcial water and rain) factors in governing their behaviour. Catastrophic pyroclastic currents impact huge regions and represent one of the most devastating natural phenomena1. Large pyroclastic currents emplace thick sequences of ash- and vesiculated juvenile-rich deposits (ignimbrite2,3). Large ignimbrites show changes in facies on a regional scale 4.
    [Show full text]
  • Atacama Pacific Gold Corporation
    TECHNICAL REPORT on the CERRO MARICUNGA GOLD PROJECT Region III CHILE prepared for ATACAMA PACIFIC GOLD CORPORATION 330 Bay Street, Suite 1210, Toronto, Ontario Canada M5H 2S8 October 7, 2011 Prepared By: Michael Easdon, Oregon Reg. Prof. Geologist Alcántara 1128, Depto. 905, Las Condes Santiago, Chile [email protected] TABLE OF CONTENTS 1.0 SUMMARY ........................................................................................................... 1 2.0 INTRODUCTION .................................................................................................. 5 3.0 RELIANCE ON OTHER EXPERTS ...................................................................... 7 4.0 PROPERTY DESCRIPTION AND LOCATION ..................................................... 8 5.0 ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY ............................................................................................... 13 6.0 HISTORY ........................................................................................................... 15 7.0 GEOLOGICAL SETTING AND MINERALIZATION ............................................ 15 7.1 PROPERTY GEOLOGY: ............................................................................. 16 8.0 DEPOSIT TYPE ................................................................................................. 33 9.0 EXPLORATION .................................................................................................. 34 10.0 DRILLING ..........................................................................................................
    [Show full text]
  • Full-Text PDF (Final Published Version)
    Pritchard, M. E., de Silva, S. L., Michelfelder, G., Zandt, G., McNutt, S. R., Gottsmann, J., West, M. E., Blundy, J., Christensen, D. H., Finnegan, N. J., Minaya, E., Sparks, R. S. J., Sunagua, M., Unsworth, M. J., Alvizuri, C., Comeau, M. J., del Potro, R., Díaz, D., Diez, M., ... Ward, K. M. (2018). Synthesis: PLUTONS: Investigating the relationship between pluton growth and volcanism in the Central Andes. Geosphere, 14(3), 954-982. https://doi.org/10.1130/GES01578.1 Publisher's PDF, also known as Version of record License (if available): CC BY-NC Link to published version (if available): 10.1130/GES01578.1 Link to publication record in Explore Bristol Research PDF-document This is the final published version of the article (version of record). It first appeared online via Geo Science World at https://doi.org/10.1130/GES01578.1 . Please refer to any applicable terms of use of the publisher. University of Bristol - Explore Bristol Research General rights This document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/red/research-policy/pure/user-guides/ebr-terms/ Research Paper THEMED ISSUE: PLUTONS: Investigating the Relationship between Pluton Growth and Volcanism in the Central Andes GEOSPHERE Synthesis: PLUTONS: Investigating the relationship between pluton growth and volcanism in the Central Andes GEOSPHERE; v. 14, no. 3 M.E. Pritchard1,2, S.L. de Silva3, G. Michelfelder4, G. Zandt5, S.R. McNutt6, J. Gottsmann2, M.E. West7, J. Blundy2, D.H.
    [Show full text]
  • Bluestone Resources Inc. Initiating Coverage 2 May 2019
    Bluestone Resources Inc. Initiating Coverage 2 May 2019 Cerro Blanco - a golden opportunity Bluestone Resources Inc. (‘Bluestone Resources’) is a TSX-V listed, mine development company, developing the Cerro Blanco underground gold deposit in Guatemala. Cerro Blanco will be a high- Target price (CAD) 2.4 grade, low cost, gold mine that could produce 113koz/yr for an Share price (CAD) 1.1 initial eight years, at the low AISC of USD 579/oz, commencing in Q4 2021. Previous owners, Goldcorp, spent over USD 170m on the project, reducing the initial capital requirement while largely de- Ticker BSR.V, BSR.CN Sector Metals & Mining risking underground mine development and de-watering. We Shares fully diluted (m) 103.7 initiate coverage of Bluestone Resources with a BUY Market cap (USDm) 63.5 recommendation and a target price of CAD 2.40/sh. Net debt Q1'19 (USDm) (20) Minority interests (USDm) - Enterprise value (USDm) 44 Free float (%) 33 High grade – high margin – near term production The Cerro Blanco gold deposit is one of the highest-grade gold Performance deposits in the world, containing reserves of 0.94Moz at 8.5g/t gold CAD and 32.2g/t silver. The fully permitted mine will produce 113koz/yr at 1.50 the low AISC of USD 579/oz for its 8-year mine life, commencing in Q4 2021. 1.40 1.30 Resource upgrade to increase valuation by 10-12% 1.20 2019 drilling is targeting conversion of 0.20-0.25Moz of inferred resources, 60% of which could be converted to reserves for inclusion 1.10 within the mine plan.
    [Show full text]
  • Compositional Zoning of the Bishop Tuff
    JOURNAL OF PETROLOGY VOLUME 48 NUMBER 5 PAGES 951^999 2007 doi:10.1093/petrology/egm007 Compositional Zoning of the Bishop Tuff WES HILDRETH1* AND COLIN J. N. WILSON2 1US GEOLOGICAL SURVEY, MS-910, MENLO PARK, CA 94025, USA 2SCHOOL OF GEOGRAPHY, GEOLOGY AND ENVIRONMENTAL SCIENCE, UNIVERSITY OF AUCKLAND, PB 92019 AUCKLAND MAIL CENTRE, AUCKLAND 1142, NEW ZEALAND Downloaded from https://academic.oup.com/petrology/article/48/5/951/1472295 by guest on 29 September 2021 RECEIVED JANUARY 7, 2006; ACCEPTED FEBRUARY 13, 2007 ADVANCE ACCESS PUBLICATION MARCH 29, 2007 Compositional data for 4400 pumice clasts, organized according to and the roofward decline in liquidus temperature of the zoned melt, eruptive sequence, crystal content, and texture, provide new perspec- prevented significant crystallization against the roof, consistent with tives on eruption and pre-eruptive evolution of the4600 km3 of zoned dominance of crystal-poor magma early in the eruption and lack of rhyolitic magma ejected as the BishopTuff during formation of Long any roof-rind fragments among the Bishop ejecta, before or after onset Valley caldera. Proportions and compositions of different pumice of caldera collapse. A model of secular incremental zoning is types are given for each ignimbrite package and for the intercalated advanced wherein numerous batches of crystal-poor melt were plinian pumice-fall layers that erupted synchronously. Although released from a mush zone (many kilometers thick) that floored the withdrawal of the zoned magma was less systematic than previously accumulating rhyolitic melt-rich body. Each batch rose to its own realized, the overall sequence displays trends toward greater propor- appropriate level in the melt-buoyancy gradient, which was self- tions of less evolved pumice, more crystals (0Á5^24 wt %), and sustaining against wholesale convective re-homogenization, while higher FeTi-oxide temperatures (714^8188C).
    [Show full text]
  • GY 111: Physical Geology
    UNIVERSITY OF SOUTH ALABAMA GY 111: Physical Geology Lecture 9: Extrusive Igneous Rocks Instructor: Dr. Douglas W. Haywick Last Time 1) The chemical composition of the crust 2) Crystallization of molten rock 3) Bowen's Reaction Series Web notes 8 Chemical Composition of the Crust Element Wt% % of atoms Oxygen 46.6 60.5 Silicon 27.7 20.5 Aluminum 8.1 6.2 Iron 5.0 1.9 Calcium 3.6 1.9 Sodium 2.8 2.5 Potassium 2.6 1.8 Magnesium 2.1 1.4 All other elements 1.5 3.3 Crystallization of Magma http://myweb.cwpost.liu.edu/vdivener/notes/igneous.htm Bowen’s Reaction Series Source http://www.ltcconline.net/julian Igneous Rock Composition Source: http://hyperphysics.phy-astr.gsu.edu Composition Formation Dominant Silica content Temperature Minerals Ultramafic Very high Olivine, pyroxene Very low (<45%) Mafic High Olivine, pyroxene, low Ca-plagioclase Intermediate Medium Na-Plagioclase, moderate amphibole, biotite Felsic Medium-low Orthoclase, quartz, high (>65%) muscovite, biotite Igneous Rock Texture Extrusive Rocks (Rapid Cooling; non visible* crystals) Intrusive Rocks (slow cooling; 100 % visible crystals) *with a hand lens Igneous Rock Texture Igneous Rock Texture Today’s Agenda 1) Pyro-what? (air fall volcanic rocks) 2) Felsic and Intermediate Extrusive Rocks 3) Mafic Extrusive Rocks Web notes 9 Pyroclastic Igneous Rocks Pyroclastic Igneous Rocks Pyroclastic: Pyro means “fire”. Clastic means particles; both are of Greek origin. Pyroclastic Igneous Rocks Pyroclastic: Pyro means “fire”. Clastic means particles; both are of Greek origin. Pyroclastic rocks are usually erupted from composite volcanoes (e.g., they are produced via explosive eruptions from viscous, “cool” lavas) Pyroclastic Igneous Rocks Pyroclastic: Pyro means “fire”.
    [Show full text]
  • Receiver Function Analyses of Uturuncu Volcano, Bolivia and Vicinity
    University of South Florida Scholar Commons School of Geosciences Faculty and Staff Publications School of Geosciences 11-2017 Receiver Function Analyses of Uturuncu Volcano, Bolivia and Vicinity Heather McFarlin University of South Florida Douglas Christensen University of Alaska, Fairbanks Stephen R. McNutt University of South Florida, [email protected] Kevin M. Ward University of Utah Jamie Ryan University of Arizona See next page for additional authors Follow this and additional works at: https://scholarcommons.usf.edu/geo_facpub Part of the Earth Sciences Commons Scholar Commons Citation McFarlin, Heather; Christensen, Douglas; McNutt, Stephen R.; Ward, Kevin M.; Ryan, Jamie; Zandt, George; and Thompson, Glenn, "Receiver Function Analyses of Uturuncu Volcano, Bolivia and Vicinity" (2017). School of Geosciences Faculty and Staff Publications. 1430. https://scholarcommons.usf.edu/geo_facpub/1430 This Article is brought to you for free and open access by the School of Geosciences at Scholar Commons. It has been accepted for inclusion in School of Geosciences Faculty and Staff Publications by an authorized administrator of Scholar Commons. For more information, please contact [email protected]. Authors Heather McFarlin, Douglas Christensen, Stephen R. McNutt, Kevin M. Ward, Jamie Ryan, George Zandt, and Glenn Thompson This article is available at Scholar Commons: https://scholarcommons.usf.edu/geo_facpub/1430 Research Paper THEMED ISSUE: PLUTONS: Investigating the Relationship between Pluton Growth and Volcanism in the Central Andes GEOSPHERE Receiver function analyses of Uturuncu volcano, Bolivia and vicinity Heather McFarlin1, Douglas Christensen2, Stephen R. McNutt1, Kevin M. Ward3, Jamie Ryan4, George Zandt4, and Glenn Thompson1 1University of South Florida School of Geosciences, 4202 E. Fowler Avenue, NES 107, Tampa, Florida 33620, USA GEOSPHERE; v.
    [Show full text]
  • Silicic Magma Chambers and Mafic Dikes a Dissertation Submitted to the Department Of
    INVESTIGATIONS OF MAGMATIC END-MEMBERS: SILICIC MAGMA CHAMBERS AND MAFIC DIKES A DISSERTATION SUBMITTED TO THE DEPARTMENT OF GEOLOGICAL AND ENVIRONMENTAL SCIENCES AND THE COMMITTEE ON GRADUATE STUDIES OF STANFORD UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY Gwyneth Retta Hughes May 2010 © 2010 by Gwyneth Retta Hughes. All Rights Reserved. Re-distributed by Stanford University under license with the author. This work is licensed under a Creative Commons Attribution- Noncommercial 3.0 United States License. http://creativecommons.org/licenses/by-nc/3.0/us/ This dissertation is online at: http://purl.stanford.edu/cf090yt6229 Includes supplemental files: 1. Caldera references for Chapters 2 and 3 (Caldera_index_ref.pdf) 2. Bayes Classifier Code for Chapter 3 (bayes_classifier.zip) 3. Caldera data for Chapter 2 (Arc_caldera_data.csv) 4. Caldera data for Chapter 3 (All_caldera_data.csv) ii I certify that I have read this dissertation and that, in my opinion, it is fully adequate in scope and quality as a dissertation for the degree of Doctor of Philosophy. Gail Mahood, Primary Adviser I certify that I have read this dissertation and that, in my opinion, it is fully adequate in scope and quality as a dissertation for the degree of Doctor of Philosophy. David Pollard I certify that I have read this dissertation and that, in my opinion, it is fully adequate in scope and quality as a dissertation for the degree of Doctor of Philosophy. Paul Segall Approved for the Stanford University Committee on Graduate Studies. Patricia J. Gumport, Vice Provost Graduate Education This signature page was generated electronically upon submission of this dissertation in electronic format.
    [Show full text]
  • Chiodi Et Al 2019.Pdf
    Journal of South American Earth Sciences 94 (2019) 102213 Contents lists available at ScienceDirect Journal of South American Earth Sciences journal homepage: www.elsevier.com/locate/jsames Preliminary conceptual model of the Cerro Blanco caldera-hosted geothermal system (Southern Puna, Argentina): Inferences from T geochemical investigations ∗ A. Chiodia, , F. Tassib,c, W. Báeza, R. Filipovicha, E. Bustosa, M. Glok Gallid, N. Suzañoe, Ma. F. Ahumadaa, J.G. Viramontea, G. Giordanof,g, G. Pecorainoh, O. Vasellib,c a Instituto de Bio y Geociencias del NOA (IBIGEO, UNSa-CONICET), Av. 9 de Julio14, A4405BBA Salta, Argentina b Department of Earth Sciences, University of Florence, Via La Pira 4, 50121 Florence, Italy c CNR-IGG Institute of Geosciences and Earth Resources, Via La Pira 4, 50121 Florence, Italy d Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CIFICEN), Pinto 399, 7000, Buenos Aires, Argentina e Universidad Nacional de Jujuy, Argentina f Department of Sciences, University Roma Tre, 00146 Rome, Italy g CNR-IDPA Institute for Dynamics of Environmental Processes, Via M. Bianco, 20131 Milan, Italy h Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione di Palermo, Via Ugo La Malfa 153, 90146, Palermo, Italy ARTICLE INFO ABSTRACT Keywords: The Cerro Blanco Caldera (CBC) is the youngest collapse caldera system in the Southern Central Andes (Southern Hydrothermal system Puna, Argentina). The CBC is subsiding with at an average velocity of 0.87 cm/year and hosts an active geo- Fluid geochemistry thermal system. A geochemical characterization of emitted fluids was carried out based on the chemical and Geothermal prospection isotopic compositions of fumaroles, and thermal and cold springs discharged in this volcanic area with the aim of Quaternary caldera constructing the first hydrogeochemical conceptual model and preliminary estimate the geothermal potential.
    [Show full text]
  • Mineralogical and Geochemical Indicators of Subaerial Weathering in the Pozzolane Rosse Ignimbrite (Alban Hills Volcanic District, Italy)
    Georgia State University ScholarWorks @ Georgia State University Geosciences Theses Department of Geosciences 4-27-2010 Mineralogical and Geochemical Indicators of Subaerial Weathering in the Pozzolane Rosse Ignimbrite (Alban Hills Volcanic District, Italy) Jennifer M. Dickie Georgia State University Follow this and additional works at: https://scholarworks.gsu.edu/geosciences_theses Part of the Geography Commons, and the Geology Commons Recommended Citation Dickie, Jennifer M., "Mineralogical and Geochemical Indicators of Subaerial Weathering in the Pozzolane Rosse Ignimbrite (Alban Hills Volcanic District, Italy)." Thesis, Georgia State University, 2010. https://scholarworks.gsu.edu/geosciences_theses/23 This Thesis is brought to you for free and open access by the Department of Geosciences at ScholarWorks @ Georgia State University. It has been accepted for inclusion in Geosciences Theses by an authorized administrator of ScholarWorks @ Georgia State University. For more information, please contact [email protected]. MINERALOGICAL AND GEOCHEMICAL INDICATORS OF SUBAERIAL WEATHERING IN THE POZZOLANE ROSSE IGNIMBRITE (ALBAN HILLS VOLCANIC DISTRICT, ITALY) by JENNIFER M. DICKIE Under the direction of Dr. Daniel Deocampo ABSTRACT The Pozzolane Rosse ignimbrite [PR] (457±4 ka) in the Alban Hills Volcanic District, Rome, Italy was exposed ~ 40 ka prior to a subsequent volcanic event which coverd it entirely. XRF, XRD, and clay separation results from PR samples from INGV and CA1 boreholes and Castel di Leva quarry show evidence of paleopedogenesis. All locations display loss of base cations, loss of K is consistent with XRD datat showing dissolution or alteration of leucite to analcime. Accumulation of Al and high L.O.I. support XRD evidence of 1:1 clay species at upper depth.
    [Show full text]
  • Erosion, Transport and Segregation of Pumice and Lithic Clasts in Pyroclastic ¯Ows Inferred from Ignimbrite at Lascar Volcano, Chile
    Journal of Volcanology and Geothermal Research 104 (2000) 201±235 www.elsevier.nl/locate/jvolgeores Erosion, transport and segregation of pumice and lithic clasts in pyroclastic ¯ows inferred from ignimbrite at Lascar Volcano, Chile E.S. Caldera,*, R.S.J. Sparksa, M.C. Gardewegb aDepartment of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK bServicio Nacional de Geologia y Mineria, Avenida Santa Maria 0104, Casilla 10465, Santiago, Chile Received 4 November 1998; revised and accepted 4 May 2000 Abstract Investigations have been made on the distribution of pumice and lithic clasts in the lithic rich Soncor ignimbrite (26.5 ka) and the 1993 pumice ¯ow deposits of Lascar Volcano, Chile. The Soncor ignimbrite shows three main lithofacies which grade into one another. Coarse lithic breccias range from matrix poor strati®ed varieties, irregular shaped sheets and elongate hummocks in proximal environments, to breccia lenses with pumiceous ignimbrite matrix. Massive, lithic rich facies comprise the bulk of the ignimbrite. Pumice rich facies are bimodal with abundant large pumice clasts (often with reverse grading), rare lithic clasts and occur distally and on high ground adjacent to deep proximal valleys. In the 1993 pyroclastic ¯ow deposits lithic rich facies are deposited on slopes up to 148 whereas pumice rich facies are deposited only on slopes ,48. Lithic rich parts show a thin pumice rich corrugated surface which can be traced into the pumice rich facies. The high lithic content in the Soncor ignimbrite is attributed to the destruction of a pre-existing dome complex, deep explosive cratering into the interior of the volcano and erosion during pyroclastic ¯ow emplacement.
    [Show full text]