Lithospheric Delamination Beneath the Southern Puna Plateau Resolved by Local Earthquake Tomography
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Muntean/Einaudi
Economic Geology Vol. 95, 2000, pp. 1445–1472 Porphyry Gold Deposits of the Refugio District, Maricunga Belt, Northern Chile JOHN L. MUNTEAN†,* AND MARCO T. EINAUDI Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115 Abstract The porphyry gold deposits of the Refugio district and similar deposits in the Maricunga belt contain the lowest known copper to gold ratios (% Cu/ppm Au = ~0.03) of any porphyry-type deposit. The gold deposits are associated with subvolcanic andesitic to dacitic intrusions emplaced into coeval volcanic rocks. Both the Verde and Pancho deposits are zoned in space from a deeper zone of banded quartz veinlets associated with chlorite-magnetite-albite and/or pyrite-albite-clay alteration to a shallow zone of pyrite-albite-clay and local quartz-alunite ledges. Pancho contains an additional, deepest, porphyry copperlike zone, with quartz veinlets (A-veinlets) and potassic alteration. Relative to Verde, Pancho is telescoped, with all three zones present within a 400-m-vertical interval. The porphyry copperlike zone at Pancho is characterized by A-veinlets and pervasive potassic alteration, both restricted to intrusive rocks. A-veinlets range from hairline streaks of magnetite ± biotite with minor quartz and chalcopyrite, and K feldspar alteration envelopes to sugary quartz veinlets <1 cm in width with mag- netite and chalcopyrite and no alteration envelopes. Hypersaline liquid inclusions coexisting with vapor-rich in- clusions indicate temperatures above 600°C and salinities as high as 84 wt percent NaCl equiv. A pressure es- timate of 250 bars indicates a depth of 1,000 m, assuming lithostatic pressure. -
Appendix A. Supplementary Material to the Manuscript
Appendix A. Supplementary material to the manuscript: The role of crustal and eruptive processes versus source variations in controlling the oxidation state of iron in Central Andean magmas 1. Continental crust beneath the CVZ Country Rock The basement beneath the sampled portion of the CVZ belongs to the Paleozoic Arequipa- Antofalla terrain – a high temperature metamorphic terrain with abundant granitoid intrusions that formed in response to Paleozoic subduction (Lucassen et al., 2000; Ramos et al., 1986). In Northern Chile and Northwestern Argentina this Paleozoic metamorphic-magmatic basement is largely homogeneous and felsic in composition, consistent with the thick, weak, and felsic properties of the crust beneath the CVZ (Beck et al., 1996; Fig. A.1). Neodymium model ages of exposed Paleozoic metamorphic-magmatic basement and sediments suggest a uniform Proterozoic protolith, itself derived from intrusions and sedimentary rock (Lucassen et al., 2001). AFC Model Parameters Pervasive assimilation of continental crust in the Central Andean ignimbrite magmas is well established (Hildreth and Moorbath, 1988; Klerkx et al., 1977; Fig. A.1) and has been verified by detailed analysis of radiogenic isotopes (e.g. 87Sr/86Sr and 143Nd/144Nd) on specific systems within the CVZ (Kay et al., 2011; Lindsay et al., 2001; Schmitt et al., 2001; Soler et al., 2007). Isotopic results indicate that the CVZ magmas are the result of mixing between a crustal endmember, mainly gneisses and plutonics that have a characteristic crustal signature of high 87Sr/86Sr and low 145Nd/144Nd, and the asthenospheric mantle (low 87Sr/86Sr and high 145Nd/144Nd; Fig. 2). In Figure 2, we model the amount of crustal assimilation required to produce the CVZ magmas that are targeted in this study. -
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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. -
Redalyc.Geochemistry, U-Pb SHRIMP Zircon Dating and Hf Isotopes of The
Andean Geology ISSN: 0718-7092 [email protected] Servicio Nacional de Geología y Minería Chile Poma, Stella; Zappettini, Eduardo O.; Quenardelle, Sonia; Santos, João O.; Koukharsky, Magdalena; Belousova, Elena; McNaughton, Neil Geochemistry, U-Pb SHRIMP zircon dating and Hf isotopes of the Gondwanan magmatism in NW Argentina: petrogenesis and geodynamic implications Andean Geology, vol. 41, núm. 2, mayo, 2014, pp. 267-292 Servicio Nacional de Geología y Minería Santiago, Chile Available in: http://www.redalyc.org/articulo.oa?id=173931252001 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Andean Geology 41 (2): 267-292. May, 2014 Andean Geology doi: 10.5027/andgeoV41n2-a01 formerly Revista Geológica de Chile www.andeangeology.cl Geochemistry, U-Pb SHRIMP zircon dating and Hf isotopes of the Gondwanan magmatism in NW Argentina: petrogenesis and geodynamic implications Stella Poma1, Eduardo O. Zappettini 2, Sonia Quenardelle 1, João O. Santos 3, † Magdalena Koukharsky 1, Elena Belousova 4, Neil McNaughton 3 1 Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA-CONICET), Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Ciencias Geológicas, Pabellón II-Ciudad Universitaria, Intendente Güiraldes 2160, C1428 EGA, Argentina. [email protected]; [email protected] 2 Servicio Geológico Minero Argentino (SEGEMAR), Avda. General Paz 5445, edificio 25, San Martín B1650WAB, Argentina. [email protected] 3 University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia. -
Geology, Petrology and Geochemical Characteristics of Alteration Zones Within the Seridune Prospect, Kerman, Iran
Geology, petrology and geochemical characteristics of alteration zones within the Seridune prospect, Kerman, Iran Von der Fakultät für Georessourcen und Materialtechnik der Rheinisch-Westfälischen Technischen Hochschule Aachen zur Erlangung des akademischen Grades eines Doktors der Naturwissenschaften genehmigte Dissertation vorgelegt von M.Sc. Hassan Barzegar aus Shiraz, Iran Berichter: Univ.-Prof. Dr.rer.nat. Franz Michael Meyer Univ.-Prof. Dr.rer.nat. Ulrich Kramm Tag der mündlichen Prüfung: 27. August 2007 Diese Dissertation ist auf den Internetseiten der Hochschulbibliothek online verfügbar For Melika and Mojan FOREWORD This research project was fully facilitated by the Institute of Mineralogy and Economic Geology, Rheinisch Westfälischen Technischen Hochschule (RWTH) Aachen University and supported by the Research Department of National Iranian Copper Industries Company (NICICO). The Institute of Mineralogy and Economic Geology, RWTH Aachen University sponsored sample preparations and geochemical analyses. First, I would like to thank my supervisor, Prof. Dr. F. Michael Meyer, Head of the Department of Mineralogy and Economic Geology, RWTH Aachen University, for his worthy support, guidance, continued interest, encouragement during this work, and for many hours of his time spent in discussions; Dr. Jochen Kolb who gave me guidance and encouragement through each stage of the work, for his interest, time spent in discussions and proof-reading this thesis; Annika Dziggel, Ph.D for her assistance and discussion and Dr. Sven Sindern for his support and assistance in XRF analyses. This thesis is also benefited by the suggestions and guidance of Prof. Dr. Ulrich Kramm and Prof. Dr. Helge Stanjek. Their interests are highly appreciated. My sincere thanks go to manager of Exploration Office, Dr. -
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. -
Sr–Pb Isotopes Signature of Lascar Volcano (Chile): Insight Into Contamination of Arc Magmas Ascending Through a Thick Continental Crust N
Sr–Pb isotopes signature of Lascar volcano (Chile): Insight into contamination of arc magmas ascending through a thick continental crust N. Sainlot, I. Vlastélic, F. Nauret, S. Moune, F. Aguilera To cite this version: N. Sainlot, I. Vlastélic, F. Nauret, S. Moune, F. Aguilera. Sr–Pb isotopes signature of Lascar volcano (Chile): Insight into contamination of arc magmas ascending through a thick continental crust. Journal of South American Earth Sciences, Elsevier, 2020, 101, pp.102599. 10.1016/j.jsames.2020.102599. hal-03004128 HAL Id: hal-03004128 https://hal.uca.fr/hal-03004128 Submitted on 13 Nov 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Copyright Manuscript File Sr-Pb isotopes signature of Lascar volcano (Chile): Insight into contamination of arc magmas ascending through a thick continental crust 1N. Sainlot, 1I. Vlastélic, 1F. Nauret, 1,2 S. Moune, 3,4,5 F. Aguilera 1 Université Clermont Auvergne, CNRS, IRD, OPGC, Laboratoire Magmas et Volcans, F-63000 Clermont-Ferrand, France 2 Observatoire volcanologique et sismologique de la Guadeloupe, Institut de Physique du Globe, Sorbonne Paris-Cité, CNRS UMR 7154, Université Paris Diderot, Paris, France 3 Núcleo de Investigación en Riesgo Volcánico - Ckelar Volcanes, Universidad Católica del Norte, Avenida Angamos 0610, Antofagasta, Chile 4 Departamento de Ciencias Geológicas, Universidad Católica del Norte, Avenida Angamos 0610, Antofagasta, Chile 5 Centro de Investigación para la Gestión Integrada del Riesgo de Desastres (CIGIDEN), Av. -
Bianchi, M., Heit, B., Jakovlev, A., Yuan, X., Kay, SM
Originally published as: Bianchi, M., Heit, B., Jakovlev, A., Yuan, X., Kay, S.M., Sandvol, E., Alonso, R.N., Coira, B., Brown, L., Kind, R., Comte, D. (2013): Teleseismic tomography of the southern Puna plateau in Argentina and adjacent regions. ‐ Tectonophysics, 586, 65‐83 DOI: 10.1016/j.tecto.2012.11.016 *Manuscript Click here to download Manuscript: Bianchi-etal.doc Click here to view linked References Teleseismic tomography of the southern Puna plateau in Argentina and adjacent regions 1 2 3 M. Bianchi 1, B. Heit 1,*, A. Jakovlev 2, X. Yuan 1, S. M. Kay 3, E. Sandvol 4, R. N. Alonso 5, B. 4 5 6 Coira 6, R. Kind 1,7 7 8 9 1 Deutsches GeoForschungsZentrum GFZ, Telegrafenberg, 14473 Potsdam, Germany 10 11 12 13 2 Institute of Geology, SB RAS, Novosibirsk, Russia 14 15 16 3 Cornell University, EAS, Snee Hall, Ithaca, NY, 14850. 17 18 19 4 Department of Geological Sciences, University of Missouri, Columbia MO 65211 20 21 22 23 5 Universidad Nacional de Salta, Buenos Aires 177, 4400-Salta, Argentina 24 25 26 6 CONICET, Instituto de Geología y Minería, Universidad Nacional de Jujuy, Avda. Bolivia 1661, 27 28 29 4600-San Salvador de Jujuy, Argentina 30 31 32 7 Freie Universität Berlin, Maltesserstr. 74-100, 12227 Berlin, Germany 33 34 35 36 * Corresponding author, [email protected]. 37 38 39 40 41 42 43 ABSTRACT 44 45 46 An array of 74 seismological stations was deployed in the Argentine Puna and adjacent regions for 47 48 a period of two years. -
Indium-Bearing Paragenesis from the Nueva Esperanza and Restauradora Veins, Capillitas Mine, Argentina
Journal of Geosciences, 65 (2020), 97–109 DOI: 10.3190/jgeosci.304 Original paper Indium-bearing paragenesis from the Nueva Esperanza and Restauradora veins, Capillitas mine, Argentina María Florencia MÁRQUEZ-ZAVALÍA1,2*, Anna VYMAZALOVÁ3, Miguel Ángel GALLISKI1, Yasushi WATANABE4, Hiroyasu MURAKAMI5 1 IANIGLA, CCT-Mendoza (CONICET), Avda. A. Ruiz Leal s/n, Parque San Martin, CC330, (5500) Mendoza, Argentina; [email protected] 2 Mineralogía y Petrología, FAD, Universidad Nacional de Cuyo, Centro Universitario (5502) Mendoza, Argentina 3 Department of Rock Geochemistry, Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic 4 Faculty of International Resource Sciences, Mining Museum of Akita University, 28-2 Osawa, Tegata, Akita, 010-8502 Japan 5 Coal Business Planning Group, Coal Business Office, Resources & Power Company, JXTG Nippon Oil & Energy Corporation, 1-2, Otemachi 1-chome, Chiyoda-ku, Tokyo 100-8162 Japan * Corresponding author The Nueva Esperanza and Restauradora are two of the twenty-three veins described at Capillitas mine, an epithermal precious- and base-metal vein deposit located in northern Argentina. Capillitas is genetically linked to other minera- lizations of the Farallón Negro Volcanic Complex, which hosts several deposits. These include two world-class (La Alumbrera and Agua Rica) and some smaller (e.g., Bajo El Durazno) porphyry deposits, and a few epithermal deposits (Farallón Negro, Alto de la Blenda, Cerro Atajo and Capillitas). The main hypogene minerals found at these two ve- ins include pyrite, sphalerite, galena, chalcopyrite, tennantite-(Zn) and tennantite-(Fe). Accessory minerals comprise hübnerite, gold, silver, stannite, stannoidite and mawsonite, and also diverse indium- and tellurium-bearing minerals. -
Tracing a Major Crustal Domain Boundary Based on the Geochemistry of Minor Volcanic Centres in Southern Peru
7th International Symposium on Andean Geodynamics (ISAG 2008, Nice), Extended Abstracts: 298-301 Tracing a major crustal domain boundary based on the geochemistry of minor volcanic centres in southern Peru Mirian Mamani1, Gerhard Wörner2, & Jean-Claude Thouret3 1 Georg-August University, Goldschmidstr. 1, 37077 Göttingen, Germany ([email protected], [email protected]) 2 Université Blaise Pascal, Clermont Ferrand, France ([email protected]) KEYWORDS : minor volcanic centres, crust, tectonic erosion, Central Andes, isotopes Introduction Geochemical studies of Tertiary to Recent magmatism in the Central Volcanic Zone have mainly focused on large stratovolcanoes. This is because mafic minor volcanic centres and related flows that formed during a single eruption are relatively rare and occur in locally clusters (e.g. Andagua/Humbo fields in S. Peru, Delacour et al., 2007; Negrillar field in N. Chile, Deruelle 1982) or in the back arc region (Davidson and de Silva, 1992). These studies showed that the "monogenetic" lavas are high-K calc-alkaline and their major, trace, and rare elements, as well as Sr-, Nd- and Pb- isotopes data display a range comparable to those of the Central Volcanic Zone composite volcanoes (Delacour et al., 2007). It has been argued that the eruptive products of these minor centers bypass the large magma chamber systems below Andean stratovolcanoes and thus may represent magmas that were derived from a deeper level in the crust (Davidson and de Silva, 1992; Ruprecht and Wörner, 2007). This study represents a continuation of our work to understand the regional variation in erupted magma composition in the Central Andes (Mamani et al., 2008; Wörner et al., 1992). -
The Role of Crustal and Eruptive Processes Versus Source Variations in Controlling the Oxidation State of Iron in Central Andean Magmas ∗ Stephanie B
Earth and Planetary Science Letters 440 (2016) 92–104 Contents lists available at ScienceDirect Earth and Planetary Science Letters www.elsevier.com/locate/epsl The role of crustal and eruptive processes versus source variations in controlling the oxidation state of iron in Central Andean magmas ∗ Stephanie B. Grocke a,b, , Elizabeth Cottrell a, Shanaka de Silva b, Katherine A. Kelley c a Smithsonian Institution, National Museum of Natural History, Washington, DC 20560, USA b College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA c Graduate School of Oceanography, University of Rhode Island, Narragansett, RI 20882, USA a r t i c l e i n f o a b s t r a c t Article history: The composition of the continental crust is closely tied to subduction zone magmatism. Elevated oxygen Received 8 July 2015 fugacity ( f O2) plays a central role in fostering crystallization of oxide minerals and thereby aids in Received in revised form 21 January 2016 generating the calc-alkaline trend of iron depletion that characterizes the continents. Along continental Accepted 24 January 2016 margins, arc magmas erupt through continental crust and often undergo extensive differentiation that Available online 22 February 2016 may modify magmatic f O2. The importance of the subducting slab and mantle wedge relative to Editor: T.A. Mather the effects of this differentiation on the f O2 recorded by continental arc magmas remains relatively Keywords: unconstrained. Here, we focus on the effect of differentiation on magmatic f O2 using a suite of 14 Central Andean volcanic zone samples from the Central Volcanic Zone (CVZ) of the Andes where the continental crust is atypically thick crustal assimilation (60–80 km). -
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.