DOCSLIB.ORG

Decelles, P.G., Carrapa, B., and Gehrels, G.E., 2007, Detrital Zircon

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Decelles, P.G., Carrapa, B., and Gehrels, G.E., 2007, Detrital Zircon Detrital zircon U-Pb ages provide provenance and chronostratigraphic information from Eocene synorogenic deposits in northwestern Argentina P.G. DeCelles Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA B. Carrapa Universität Potsdam, Institut für Geowissenschaften, 14476 Golm, Germany G.E. Gehrels Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA ABSTRACT progressively more abundant in the upper part Paleogene clastic sedimentary rocks in the Puna plateau of northwestern Argentina contain of the formation (Fig. 2; Carrapa and DeCelles, valuable information about the timing and location of early mountain building in the central 2006). Conglomerates in the Geste Formation Andes. Because these rocks generally lack tuffaceous facies, only paleontological ages have been contain clasts of vein quartz, quartzite, and available. We present U-Pb ages from detrital zircons in the conglomeratic Eocene Geste Forma- phyllite that are identical to rocks in the under- tion of the central Puna plateau. The zircon ages indicate that the Geste Formation was derived lying Ordovician Copalayo Formation (Azeño- from nearby high-relief ranges composed of Ordovician metasedimentary rocks. A small popu- laza, 1973). Paleocurrent data indicate chiefl y lation of ca. 37–35 Ma grains also confi rms the late Eocene stratigraphic age of the Geste Forma- eastward paleofl ow directions (Carrapa and tion, and suggests that U-Pb detrital zircon ages may provide a new tool for determining deposi- DeCelles, 2006). Middle to upper Eocene fos- tional ages and provenance of widespread Paleogene deposits in the central Andes. sils have been recovered from the middle part of the Geste Formation (marsupials, notoungulates, Keywords: Andes, Argentina, syntectonic sedimentation, U-Pb geochronology. and armadillos; Pascual, 1983; Alonso, 1992). The ranges to the east of the Salar de INTRODUCTION samples of the Geste Formation in the Salar de Pastos Grandes are composed of Ordovician– Acquisition of U-Pb ages of detrital zircons Pastos Grandes area in the central Puna plateau, Silurian granitoid rocks and pegmatites, and from clastic sedimentary rocks is revolution- we discovered a small but systematic group of upper Precambrian metasedimentary rocks izing the discipline of sedimentary petrology Eocene grains in several samples. These data (Puncoviscana Formation, mainly phyllite by providing information about both prov- are consistent with previous vertebrate biostrati- and quartzite), gneisses, and orthogneisses. enance and, in some cases, chronostratigraphy graphic ages (Pascual, 1983; Alonso, 1992), and Pliocene andesites form the >6 km peaks of (Gray and Zeitler, 1997; DeCelles et al., 1998, provide some of the best constraints yet avail- the Nevados de Pastos Grandes, directly north 2004; Gehrels et al., 1999, 2000; DeGraaff- able on the exact ages of these strata. Moreover, of the study area (Fig. 1B). Surpless et al., 2002; Dickinson and Gehrels, our data raise the possibility that U-Pb ages of 2003; Amidon et al., 2005; Link et al., 2005; detrital zircons in general may provide useful METHODS Surpless et al., 2006). Although there have chronostratigraphic information in retroarc set- Six samples of medium- to coarse-grained been detrital zircon geochronological studies tings such as the Andean orogenic belt, where sandstone from the Geste Formation and one of the pre-Cenozoic rocks of the southern and comagmatic zircons may be prevalent even in sample of medium-grained quartzite from the central Andes (Hervé et al., 2003; Augustsson apparently ash-free sediments. underlying Ordovician Copalayo Formation were et al., 2003; Finney et al., 2003, 2005; Fanning collected and processed by standard methods et al., 2004; Thomas et al., 2004; Gelcich et al., GEOLOGICAL SETTING AND for separating zircons. U-Pb geo chronology of 2005; Do Campo and Ribeiro Guevara, 2005), STRATIGRAPHY zircons was conducted by laser-ablation–multi- no attempt has been made to apply the method The Geste Formation is one of many local collector inductively coupled plasma–mass spec- to Cenozoic strata. Widespread Paleogene strata accumulations of coarse-grained Cenozoic sedi- trometry at the University of Arizona Laser Chron of the central Andes (Fig. 1; Jordan and Alonso, mentary rocks of generally pre-Neogene age in Center. Details of the method were described in 1987; Alonso, 1992) are especially attractive northwestern Argentina and southern Bolivia Gehrels et al. (2000, 2006). targets for detrital U-Pb geochronology because (Fig. 1; Jordan and Alonso, 1987; Sempere et al., Analyses that yielded isotopic data of accept- these sparsely dated, coarse-grained clastic 1997; Horton, 1998). The unit is ~2 km thick able discordance, in-run fractionation, and pre- strata potentially contain information about the (Fig. 2) and is exposed in the Salar de Pastos cision are in GSA Data Repository Table DR1.1 timing and location of early mountain building Grandes area of the Puna plateau, a vast high- Because 206Pb/238U ages are generally more in the central Andes, a topic that generates vigor- elevation (>4 km average elevation) region in precise for younger ages, whereas 206Pb/207Pb ous debate (Allmendinger et al., 1997; Sempere the interior of the central Andean orogenic sys- ages are more precise for older ages, we rely on et al., 1997; Lamb and Hoke, 1997; Kley et al., tem. The Geste Formation unconformably over- 206Pb/238U ages up to 1000 Ma and 206Pb/207Pb 1997; Jordan et al., 1997, 2001; Coutand et al., lies Middle to Upper Ordovician phyllite and ages if the 206Pb/238U ages are older than 1000 2001; Horton et al., 2002; DeCelles and Horton, quartzite of the Copalayo (or Colquena) Forma- Ma (Gehrels et al., 2006). We report here a total 2003; Elger et al., 2005; Carrapa et al., 2005; tion (Fig. 1; Alonso, 1992; Blasco et al., 1995), of 606 zircon ages. These analyses are plotted Arriagada et al., 2006). Historically, the ages of which forms the bulk of the range directly to the on relative age-probability diagrams (Fig. 3), Paleogene strata in the central Andes have been west of our investigated section. which represent a sum of the probability distri- diffi cult to document owing to a paucity of dat- The Geste Formation consists of an overall butions of all analyses from a sample, normal- able volcanogenic sediment. upward-coarsening succession of sandstone, We set out to document U-Pb ages of detri- conglomerate, and subordinate mudstone (Fig. 2; 1GSA Data Repository item 2007079, Table DR1, U-Pb geochronologic analyses, is available online at tal zircons in Cenozoic basin fi lls of the central Alonso, 1992). The lower part of the Geste www.geosociety.org/pubs/ft2007.htm, or on request Andes of northwestern Argentina primarily as a Forma tion consists of exclusively fl uvial facies, from editing@geosociety.org or Documents Secre- provenance tool. In the course of our work on and coarse-grained alluvial-fan deposits become tary, GSA, P.O. Box 9140, Boulder, CO 80301, USA. © 2007 The Geological Society of America. For permission to copy, contact Copyright Permissions, GSA, or editing@geosociety.org. GEOLOGY,Geology, April April 2007; 2007 v. 35; no. 4; p. 323–326; doi: 10.1130/G23322A.1; 3 fi gures; Data Repository item 2007079. 323 68° 67° 66° 24° Salars/ Sijes Fm. B C Queva peaks 6130m ndes Pozuelos Fm. a Cover Miocene Pleistocene upper Tertiary middle Eocene Pastos Gr Volcanics lower Geste Fm. Salar Pocitos Pliocene Oire Fm. Upper Capalayo Fm. mo Tertiary Measured sect. Ordovician ¥Nevados de Santa Rosa Salar de Arizaro dos de Paler de los 27'54''S Pastos Grandes ° Neva 24 25° A Pe r u Bol i vi a Pucara 16?S Salar de Pastos Grandes >3km Salar de elevation Hombre Muerto 20?S SIJES e l i ? h 24 S C Study area os 28?S Argentina s je El Morro Paci f i c i Pozuel S Ocean 0 20 km e 74?W 66?W d 26° a Elevation Quaternary salt lakes and Neogene Upper Paleozoic Salar de salt flats plutonic rocks plutonic rocks r r 6500 Quaternary continental Cambrian palayo Neogene e sedimentary rocks volcanic rocks sedimentary rocks i Co S Neogene/Quaternary Tertiary Paleozoic 0 3 km volcanic rocks plutonic rocks 45'54''S sedimentary rocks ° io Neogene/Quaternary Paleogene Ordovician sedimentary r a 24 n ignimbrites sedimentary rocks and local volcanic rocks e t n Quaternary, locally Plio- Cretaceous Precambrian/Cambrian e 1000 C plutonic rocks . Pleistocene basalt sedimentary rocks S Quaternary, locally Plio- Carboniferous Precambrian/Cambrian sedimentary rocks Pleistocene volcanic rocks sedimentary rocks 66°42'18W'' 66°27'54W'' Faults Figure 1. A: General location map of central South America showing location of study area in northwestern Argentina. Shaded region rep- resents area in which elevation exceeds 3 km. B: Geological map of central Andes (modifi ed after Reutter et al., 1994). Inset shows location of area within context of broader Andean orogenic belt; rectangle corresponds to C. C: Geological map of Salar de Pastos Grandes area (modifi ed after Alonso, 1992) draped on digital elevation model. Fm.—formation. ized such that the areas beneath the probability ± 1.5 Ma to 35.4 ± 0.55 Ma (Fig. 3). The pres- these rocks should help to constrain the timing curves are equal for all samples. Age peaks on ence of previously reported Eocene mammal of initial crustal thickening and uplift in the Puna these diagrams are considered robust if defi ned fossils (Pascual, 1983) in the Geste Formation plateau. In this case, our data require proximal by several analyses.
Load more

Recommended publications
  • Chronostratigraphy of the Mammal-Bearing Paleocene of South America 51
    Thierry SEMPERE biblioteca Y. Joirriiol ofSoiiih Ainorirari Euirli Sciriin~r.Hit. 111. No. 1, pp. 49-70, 1997 Pergamon Q 1‘197 PublisIlcd hy Elscvicr Scicncc Ltd All rights rescrvcd. Printed in Grcnt nrilsin PII: S0895-9811(97)00005-9 0895-9X 11/97 t I7.ol) t o.(x) -. ‘Inshute qfI Human Origins, 1288 9th Street, Berkeley, California 94710, USA ’Orstom, 13 rue Geoffroy l’Angevin, 75004 Paris, France 3Department of Geosciences, The University of Arizona, Tucson, Arizona 85721, USA Absfract - Land mammal faunas of Paleocene age in the southern Andean basin of Bolivia and NW Argentina are calibrated by regional sequence stratigraphy and rnagnetostratigraphy. The local fauna from Tiupampa in Bolivia is -59.0 Ma, and is thus early Late Paleocene in age. Taxa from the lower part of the Lumbrera Formation in NW Argentina (long regarded as Early Eocene) are between -58.0-55.5 Ma, and thus Late Paleocene in age. A reassessment of the ages of local faunas from lhe Rfo Chico Formation in the San Jorge basin, Patagonia, southern Argentina, shows that lhe local fauna from the Banco Negro Infeiior is -60.0 Ma, mak- ing this the most ancient Cenozoic mammal fauna in South,America. Critical reevaluation the ltaboraí fauna and associated or All geology in SE Brazil favors lhe interpretation that it accumulated during a sea-level lowsland between -$8.2-56.5 Ma. known South American Paleocene land inammal faunas are thus between 60.0 and 55.5 Ma (i.e. Late Paleocene) and are here assigned to the Riochican Land Maminal Age, with four subages (from oldest to youngest: Peligrian, Tiupampian, Ilaboraian, Riochican S.S.).
    [Show full text]
  • Unraveling the Peruvian Phase of the Central Andes: Stratigraphy, Sedimentology and Geochronology of the Salar De Atacama Basin (22°30-23°S), Northern Chile
    See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/271538622 Unraveling the Peruvian Phase of the Central Andes: Stratigraphy, sedimentology and geochronology of the Salar de Atacama Basin (22°30-23°S), northern Chile Article in Basin Research · March 2015 DOI: 10.1111/bre.12114 CITATIONS READS 5 127 4 authors: Sebastián Bascuñán Cesar Arriagada University of Chile University of Chile 4 PUBLICATIONS 5 CITATIONS 90 PUBLICATIONS 664 CITATIONS SEE PROFILE SEE PROFILE Jacobus Philippus Le Roux Katja Deckart University of Chile University of Chile 141 PUBLICATIONS 1,668 CITATIONS 28 PUBLICATIONS 610 CITATIONS SEE PROFILE SEE PROFILE All in-text references underlined in blue are linked to publications on ResearchGate, Available from: Jacobus Philippus Le Roux letting you access and read them immediately. Retrieved on: 09 August 2016 EAGE Basin Research (2015) 1–28, doi: 10.1111/bre.12114 Unraveling the Peruvian Phase of the Central Andes: stratigraphy, sedimentology and geochronology of the Salar de Atacama Basin (22°30–23°S), northern Chile Sebastia´ n Bascun˜ a´ n,* Ce´ sar Arriagada,* Jacobus Le Roux*,† and Katja Deckart* *Departamento de Geologıa, Universidad de Chile, Santiago, Chile †Centro de Excelencia en Geotermia de los Andes (CEGA), Universidad de Chile, Santiago, Chile ABSTRACT The Salar de Atacama Basin holds important information regarding the tectonic activity, sedimen- tary environments and their variations in northern Chile during Cretaceous times. About 4000 m of high-resolution stratigraphic columns of the Tonel, Purilactis and Barros Arana Formations reveal braided fluvial and alluvial facies, typical of arid to semi-arid environments, interrupted by scarce intervals with evaporitic, aeolian and lacustrine sedimentation, displaying an overall coarsening- upward trend.
    [Show full text]
  • Low-Temperature Thermochronologic Trends Across the Central Andes, 21°S–28°S
    Downloaded from memoirs.gsapubs.org on November 14, 2014 The Geological Society of America Memoir 212 2015 Low-temperature thermochronologic trends across the central Andes, 21°S–28°S P.W. Reiners S.N. Thomson A. Vernon Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA S.D. Willett Geologisches Institut, Eidgenössische Technische Hochschule, NO E 33, Sonneggstrasse 5, 8092 Zürich, Switzerland M. Zattin Department of Geosciences, University of Padova, 35137 Padova, Italy J. Einhorn* G. Gehrels J. Quade D. Pearson† K.E. Murray Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA W. Cavazza Dipartimento di Scienze, Biologiche, Geologiche e Ambientali, Università di Bologna, 40126 Bologna, Italy ABSTRACT In this paper, we merge more than 200 new apatite and zircon (U-Th)/He analyses and 21 apatite fi ssion-track analyses from 71 new samples with previous published thermochronologic data using the same systems to understand the growth and large- scale kinematics of the central Andes between 21°S and 28°S. In general, minimum dates decrease and the total range of dates increases from west to east across the range. Large variations in thermochronometer dates on the east side refl ect high spa- tial gradients in depth of recent erosional exhumation. Almost nowhere in this part of the Andes has Cenozoic erosion exceeded ~6–8 km, and in many places in the eastern half of the range, erosion has not exceeded 2–3 km, despite these regions now being *Current address: ExxonMobil Exploration Company, 233 Benmar Drive, Houston, Texas 77060, USA.
    [Show full text]
  • Apatite Triple Dating and White Mica 40Ar/39Ar
    Apatite triple dating and white mica 40Ar/ 39Ar thermochronology of syntectonic detritus in the Central Andes: A multiphase tectonothermal history B. Carrapa1, P.G. DeCelles2, P.W. Reiners2, G.E. Gehrels2, and M. Sudo3 1Department of Geology and Geophysics, University of Wyoming, Laramie, Wyoming 82071, USA 2Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA 3Universität Potsdam, Institut für Geowissenschaften, 14476 Golm, Germany ABSTRACT We applied apatite U-Pb, fi ssion track, and (U-Th)/He triple dating and white mica 40Ar/39Ar thermochronology to syntectonic sedimentary rocks from the central Andean Puna plateau in order to determine the source-area geochronology and source sedimentary basin thermal his- tories, and ultimately the timing of multiple tectonothermal events in the Central Andes. Apa- tite triple dating of samples from the Eocene Geste Formation in the Salar de Pastos Grandes basin shows late Precambrian–Devonian apatite U-Pb crystallization ages, Eocene apatite fi s- sion track (AFT), and Eocene–Miocene (U-Th)/He (ca. 8–47 Ma) cooling ages. Double dating of cobbles from equivalent strata in the Arizaro basin documents early Eocene (46.2 ± 3.9 Ma) and Cretaceous (107.6 ± 7.6, 109.5 ± 7.7 Ma) AFT and Eocene–Oligocene (ca. 55–30 Ma) (U-Th)/He ages. Thermal modeling suggests relatively rapid cooling between ca. 80 and 50 Ma and reheating and subsequent diachronous basin exhumation between ca. 30 Ma and 5 Ma. The 40Ar/39Ar white mica ages from the same samples in the Salar de Pastos Grandes area are mainly 400–350 Ma, younger than apatite U-Pb ages, suggesting source-terrane cooling and exhumation during the Devonian–early Carboniferous.
    [Show full text]
  • The Growth of the Central Andes, 22°S–26°S
    Downloaded from memoirs.gsapubs.org on January 15, 2015 The Geological Society of America Memoir 212 2015 The growth of the central Andes, 22°S–26°S J. Quade* M.P. Dettinger B. Carrapa P. DeCelles K.E. Murray Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA K.W. Huntington Department of Earth and Space Sciences, University of Washington, Seattle, Washington 98195-1310, USA A. Cartwright Mintec, Inc., 3544 East Fort Lowell Road, Tucson, Arizona 85716, USA R.R. Canavan Department of Geology, University of Wyoming, Laramie, Wyoming 82071, USA G. Gehrels Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA M. Clementz Department of Geology, University of Wyoming, Laramie, Wyoming 82071, USA ABSTRACT We synthesize geologic observations with new isotopic evidence for the timing and magnitude of uplift for the central Andes between 22°S and 26°S since the Paleocene. To estimate paleoelevations, we used the stable isotopic composition of carbonates and volcanic glass, combined with another paleoelevation indicator for the central Andes: the distribution of evaporites. Paleoelevation reconstruction using clumped isotope paleothermometry failed due to resetting during burial. The Andes at this latitude rose and broadened eastward in three stages during the Cenozoic. The fi rst, in what is broadly termed the “Incaic” orogeny, ended by the late Eocene, when magmatism and deformation had elevated to ≥4 km the bulk (~50%) of what is now the western and central Andes. The second stage witnessed the gradual building of the easternmost Puna and Eastern Cordillera, starting with deforma- tion as early as 38 Ma, to >3 km by no later than 15 Ma.
    [Show full text]
  • Un Nuevo Notopithecinae (Notoungulata, Typotheria) Del Terciario Inferior De La Puna Argentina
    ISSN: 0211-8327 STVDIA GEOLÒGICA SALMANTICENSIA, 31 (1995): p. 87-99. UN NUEVO NOTOPITHECINAE (NOTOUNGULATA, TYPOTHERIA) DEL TERCIARIO INFERIOR DE LA PUNA ARGENTINA. GUILLERMO LÓPEZ (*) MARIANO BOND (*) LÓPEZ, G. & BOND, M. (1995): Un nuevo Notopithecinae (Notoungulata, Typotheria) del Terciario Inferior de la Puna argentina. [A new Notopithecinae (Notoungulata, Typotheria) of Lower Tertiary from the argentinian Puna.]. Stvd.Geol.Salmant., 31: p. 87-99. Salamanca, 1996-02-15. (FECHA DE RECEPCIÓN: 1995-12-12) (FECHA DE ADMISIÓN: 1995-12-26 Palabras clave: Notoungulata, Notopithecinae, Sistemática, Nuevo, Eoceno, Argentina. Key words: Notoungulata, Notopithecinae, Systematic, New, Eocene, Argentina. (*): Departamento Científico Paleontología Vertebrados. Museo de La Plata. Paseo del Bosque s/n. (1900) La Plata, Buenos Aires. República Argentina. Ediciones Universidad de Salamanca 88 G.LÓPEZ & M.BOND UN NUEVO NOTOPITHECINAE DEL TERCIARIO INFERIOR DE LA PUNA ARGENTINA RESUMEN: Los Interatheriidae Notopithecinae son un grupo de notoungulados tipoterios de tamaño muy pequeño, muy frecuentes en el Paleógeno de Patagonia; generalmente, han sido considerados como ancestrales a la más avanzada subfamilia Interatheriinae. Aquí se describe Punapithecus minor n. gen. y n. sp., proveniente de la Formación Geste (Grupo Pastos Grandes) de Antofagasta de la Sierra, Provincia de Catamarca y San Antonio de los Cobres, Provincia de Salta, en el noroeste argentino. El nivel fosilífero ha sido asignado, por su fauna asociada, a la Edad Mustersense (Eoceno medio). Este es el primer registro para este grupo fuera de Patagonia en la Argentina; también se los ha registrado, con certeza, en capas del Paleógeno de Chile. Punapithecus minor presenta los siguientes caracteres diagnósticos: Tamaño más pequeño (al menos la mitad) que el de todos los otros Notopithecinae conocidos.
    [Show full text]
  • VIII Encontro De Biologia Comparada E
    Universidade de São Paulo Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto Programa de Pós-Graduação em Biologia Comparada ANAIS DO EVENTO VIII Encontro de Biologia Comparada e II Workshop de Extensão em Biologia Comparada “A Biodiversidade e as Diversidades da Biologia” Ribeirão Preto Julho de 2017 2 Cidade, G. M. (Editor) Anais do Evento VIII Encontro de Biologia Comparada e II Workshop de Extensão em Biologia Comparada. Giovanne Mendes Cidade (ed.). Ribeirão Preto: FFCLRP- USP, 2017. 35 p. Ciências Biológicas - Biologia 3 SUMÁRIO Apresentação 4 Comissão Organizadora 5 Apoio 6 Programação diária 7 Resumos dos Minicursos 14 II Workshop de Extensão em Biologia Comparada: resumos das oficinas 21 Apresentação de trabalhos: resumos 27 Agradecimentos 33 4 APRESENTAÇÃO O Programa de Pós-Graduação em Biologia Comparada, criado em 1997 e sediado no Departamento de Biologia da Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto da Universidade de São Paulo (FFCLRP-USP), tem como objetivo a formação de docentes, pesquisadores e profissionais das mais diversas atividades no âmbito das Ciências Biológicas. De caráter interdisciplinar, o programa compreende grupos de pesquisa de diferentes áreas e enfatiza a compreensão da história evolutiva dos organismos, suas inter-relações e seus mecanismos de adaptação aos diferentes tipos de ambiente. Levando em conta a importância da divulgação do Programa e dos projetos nele desenvolvidos tanto para a atração de novos alunos quanto para o intercâmbio do conhecimento gerado, os alunos do Programa têm realizado, a cada dois anos, os Encontros de Biologia Comparada, que nesta ocasião alcançam sua oitava edição. Em todas as edições do evento, a Biodiversidade, sua origem e evolução, bem como o papel da Biologia Comparada no seu estudo, aplicação e conservação, foram temas que permearam os debates.
    [Show full text]
  • (Puna Plateau, NW Argentina). Implication for the Geothermal System Investigation
    energies Article Geological Map of the Tocomar Basin (Puna Plateau, NW Argentina). Implication for the Geothermal System Investigation Rubén Filipovich 1,* , Walter Báez 1, Gianluca Groppelli 2,* , Florencia Ahumada 1 , Luca Aldega 3 , Raúl Becchio 1, Gabriele Berardi 4, Sabina Bigi 3 , Chiara Caricchi 5, Agostina Chiodi 1, Sveva Corrado 4, Gianfilippo De Astis 5, Arnaldo A. De Benedetti 4 , Chiara Invernizzi 6, Gianluca Norini 2, Michele Soligo 4, Sara Taviani 7, José G. Viramonte 1 and Guido Giordano 2,4 1 Instituto de Bio y Geociencias del NOA (IBIGEO, UNSa-CONICET), Av. 9 de Julio 14, A4405BBA Salta, Argentina; geowbsalta@gmaill.com (W.B.); ahumadaflor@hotmail.com (F.A.); tatobecchio@yahoo.com (R.B.); agoch18@hotmail.com (A.C.); joseviramonte@yahoo.com.ar (J.G.V.) 2 CNR Istituto di Geologia Ambientale e Geoingegneria, sezione di Milano, Via Mario Bianco 9, 20131 Milan, Italy; gianluca.norini@cnr.it (G.N.); guido.giordano@uniroma3.it (G.G.) 3 Dipartimento di Scienze della Terra, Sapienza Università di Roma, Piazzale Aldo Moro, 5, 00185 Rome, Italy; luca.aldega@uniroma1.it (L.A.); sabina.bigi@uniroma1.it (S.B.) 4 Dipartimento di Scienze, Università degli Studi di Roma Tre, Largo S. L. Murialdo 1, 00146 Rome, Italy; gabriele.berardi@uniroma3.it (G.B.); sveva.corrado@uniroma3.it (S.C.); arnaldoangelo.debenedetti@uniroma3.it (A.A.D.B.); michele.soligo@uniroma3.it (M.S.) 5 Istituto Nazionale di Geofisica e Vulcanologia, 00143 Rome, Italy; chiara.caricchi@ingv.it (C.C.); gianfilippo.deastis@ingv.it (G.D.A.) 6 Scuola di Scienze e Tecnologia—Sezione
    [Show full text]
  • Boletim 2019 P1
    22º Seminário do Programa de Pós-Graduação em Geologia Departamento de Geologia - Universidade Federal do Paraná 24 a 28 de junho de 2019 Curitiba - PR Estilos de mineralização e geoquímica de Cu, Ag, As, Sb e Zn do depósito de Cu-Ag de Tullacondra (Cork, Irlanda) Andressa de Araujo Silva aasg18@gmail.com Orientador: Prof. Dr. Pedro Filipe de Oliveira Cordeiro (Departamento de Geologia/ UFPR) Coorientador: Prof. Dr. Leonardo Evangelista Lagoeiro (Departamento de Geologia/ UFPR) Palavras-chave: Metalogênese do Cobre; MVT Irish Type; Irish Midlands Introdução O depósito de Tullacondra é uma mineralização de Cu-Ag pertencente a Irish Midlands, situado a 10 km a noroeste da cidade de Mallow, condado de Cork, sul da Irlanda (Wilbur and Carter 1986). A Irish Midlands é uma província conhecida por abrigar importantes depósitos de Zn-Pb, como os depósitos de Navan, Lisheen e Silvermine, com cerca de 110 milhões de toneladas (Mt) de minério com valor médio de 8% Zn e 2% Pb, 22 Mt a 11,63% Zn e 1,96% Pb, e 17 Mt a 6,4% Zn, 2,5% Pb e 23 g/t Ag, respectivamente (Andrew 1986; Convery 2017; Torremans 2018). Tullacondra consiste de 3,6 Mt a 0,7% Cu e 27,7 g/t Ag, ainda não explorado e tem sido caracterizado como um corpo vertical rico em Cu com trend EW e um stratabound rico em Ag. O depósito está hospedado em rochas carbonáticas do Carbonífero Inferior do Lower Limestone Shale, lateralmente equivalente ao Grupo Navan, no flanco norte da anticlinal herciniana Kilmaclenine (figuras 1A e 1B - Wilbur and Carter 1986).
    [Show full text]
  • A Review of Tertiary Climate Changes in Southern South America and the Antarctic Peninsula
    Sedimentary Geology 247–248 (2012) 21–38 Contents lists available at SciVerse ScienceDirect Sedimentary Geology journal homepage: www.elsevier.com/locate/sedgeo Review A review of Tertiary climate changes in southern South America and the Antarctic Peninsula. Part 2: continental conditions J.P. Le Roux Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile/Centro de Excelencia en Geotérmia de los Andes, Casilla 13518, Correo 21, Santiago, Chile article info abstract Article history: Climate changes in southern South America and the Antarctic Peninsula during the Tertiary show a strong Received 12 July 2011 correlation with ocean warming and cooling events, which are in turn related to tectonic processes. During Received in revised form 1 December 2011 periods of accelerated sea-floor spreading and mid-ocean ridge activity, sea-levels rose so that parts of the Accepted 2 December 2011 continents were flooded and forests were destroyed. However, this was balanced by the large-scale release Available online 13 December 2011 of CO2 during volcanic outgassing and carbonate precipitation on the continental shelves, which caused rising air temperatures and the poleward expansion of (sub)tropical and temperate forests. Cooling episodes gen- Keywords: – Climate change erally caused an increase in the north south thermal gradient because of an equatorward shift in climate Tertiary belts, so that the Westerly Winds intensified and brought higher rainfall to the lower latitudes. An increase South America in wind-blown dust caused temperatures to drop further by reflecting sunlight back into space. Antarctic Peninsula The rising Andes Range had a marked influence on climate patterns.
    [Show full text]
  • Retroarc Basin Reorganization and Aridification During Paleogene Uplift of the Southern Central Andes
    PUBLICATIONS Tectonics RESEARCH ARTICLE Retroarc basin reorganization and aridification during 10.1002/2016TC004400 Paleogene uplift of the southern central Andes Key Points: J. C. Fosdick1,2 , E. J. Reat3, B. Carrapa4 , G. Ortiz5 , and P. M. Alvarado5 • Detrital zircon geochronology constrains Maastrichtian through 1Center for Integrative Geosciences, University of Connecticut, Storrs, Connecticut, USA, 2Department of Geography, Oligocene sedimentation 3 • Changes in sediment provenance University of Connecticut, Storrs, Connecticut, USA, Department of Geology and Geophysics, University of Utah, Salt Lake 4 5 suggest Late Eocene uplift of the City, Utah, USA, Department of Geosciences, University of Arizona, Tucson, Arizona, USA, Centro de Investigaciones de la Frontal Cordillera Geosfera y la Biosfera, Departamento de Geofísica y Astronomía, Facultad de Ciencias Exactas, Físicas y Naturales, • Paleogene sedimentation rates track Universidad Nacional de San Juan-Consejo Nacional de Investigaciones Científicas y Técnicas, San Juan, Argentina accelerating basin subsidence during Andean uplift Abstract Tectonic development of the Andean Cordillera has profoundly changed the topography, Supporting Information: climate, and vegetation patterns of the southern central Andes. The Cenozoic Bermejo Basin in Argentina • Supporting Information S1 (~30°S) provides a key record of thrust belt kinematics and paleoclimate south of the high-elevation Puna • Figure S1 • Figure S2 Plateau. Ongoing debate regarding the timing of initiation of upper plate shortening and Andean uplift • Table S1 persists, precluding a thorough understanding of the earlier tectonic and climatic controls on basin evolution. • Table S2 We present new sedimentology, detrital geochronology, sandstone petrography, and subsidence analysis • Table S3 from the Bermejo Basin that reveal siliciclastic-evaporative fluvial and lacustrine environments prior to the Correspondence to: main documented phase of Oligocene-Miocene shortening of the Frontal Cordillera and Argentine J.
    [Show full text]
  • Catamarca.Pdf
    ARQUEOLOGÍA Y PALEONTOLOGÍA de la provincia de CATAMARCA COORDINACIÓN GENERAL: Rita del Valle Rodríguez - EDICIÓN Y COMPILACIÓN: Mónica Alejandra López Dirección Provincial de Antropología Provincia de Catamarca ARQUEOLOGÍA Y PALEONTOLOGÍA DE LA PROVINCIA DE CATAMARCA Dirección Provincial de Antropología Provincia de Catamarca Gobierno de la Provincia de Catamarca Secretaría de Estado de Cultura Dirección Provincial de Antropología Departamento Educación y Difusión ARQUEOLOGÍA Y PALEONTOLOGÍA DE LA PROVINCIA DE CaTAMARCA Coordinación general: Lic. Rita del Valle Rodríguez Editor y compilador: Lic. Mónica Alejandra López Colaboración: Mgter. Sergio Antonio Alvarez, Ing. Gustavo Ariel del Viso y Srta. Mariana Deolinda Barrionuevo Diseño gráfico: Mariano Masariche. Fotos de tapa Pieza Central: Colección Museo Arqueológico Provincial Samuel Alejandro Lafone Quevedo. Andalgalá - Catamarca. Hornillo de pipa manufacturada en cerámica, ornamentado con rostros felínicos enfrentados, mostrando fauces. Asignación cultural Aguada, Periodo Agroalfarero Medio. Foto: José Luis Rodríguez. En “Tesoros Precolombinos del Noroeste Argentino”- Primer Edición. Bs As - Fun- dación Centro de Estudios Para Políticas Públicas Aplicadas (CEPPA), 2006- pp 220. Editor y compilador Matteo Goretti. Margen superior de la tapa- de izquierda a derecha: Colección Museo Arqueológico Provincial Condor Huasi - Belén - Catamarca. Puco o escudilla gris grabada. Cerámica. Asignación cultural Aguada, Estilo Hualfin. Periodo Agroalfarero Medio; Colección Museo Arqueológico Provincial Condor Huasi - Belén - Catamarca.Vaso con decoración antropomorfa y pintada en negro sobre rojo. Cerámica. Asignación cultural Ciénaga. Periodo Agroalfarero Temprano; Colección Museo Arqueológico Provincial Condor Huasi - Belén - Catamarca. Vaso antropomorfo decorado en rojo sobre crema, con una marcada protuberancia en la espalda. Cerámica. Asignación cultural Vaquerías. Periodo Agroalfarero Temprano; Colección Museo Arqueológico Provincial Condor Huasi - Belén - Catamarca.
    [Show full text]