Structural control on arc volcanism: The Caviahue-Copahue complex, Central to Patagonian Andes transition (38°S)
This paper describes the volcanostratigraphy, structure, and tectonic implications of an arc volcanic complex in an oblique subduction setting: the Caviahue caldera Copahue volcano (CAC) of the Andean margin. The CAC is located in a first-order morphotectonic transitional zone, between the low and n...
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2006
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| LEADER | 15898caa a22012497a 4500 | ||
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| 001 | PAPER-6919 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203638.0 | ||
| 008 | 190411s2006 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-33751409643 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Melnick, D. | |
| 245 | 1 | 0 | |a Structural control on arc volcanism: The Caviahue-Copahue complex, Central to Patagonian Andes transition (38°S) |
| 260 | |c 2006 | ||
| 270 | 1 | 0 | |m Melnick, D.; GeoForschungsZentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany; email: melnick@gfz-potsdam.de |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a This paper describes the volcanostratigraphy, structure, and tectonic implications of an arc volcanic complex in an oblique subduction setting: the Caviahue caldera Copahue volcano (CAC) of the Andean margin. The CAC is located in a first-order morphotectonic transitional zone, between the low and narrow Patagonian and the high and broad Central Andes. The evolution of the CAC started at approximately 4-3 Ma with the opening of the 20 × 15 km Caviahue pull-apart caldera; Las Mellizas volcano formed inside the caldera and collapsed at approximately 2.6 Ma; and the Copahue volcano evolved in three stages: (1) 1.2-0.7 Ma formed the approximately 1 km thick andesitic edifice, (2) 0.7-0.01 Ma erupted andesitic-dacitic subglacial pillow lavas, and (3) 0.01-0 Ma erupted basaltic-andesites and pyroclastic flows from fissures, aligned cones, and summit craters. Magma ascent has occurred along planes perpendicular to the least principal horizontal stress, whereas hydrothermal activity and hot springs also occur along parallel planes. At a regional scale, Quaternary volcanism concentrates along the NE-trending, 90 km long Callaqui-Copahue-Mandolegüe lineament, the longest of the southern volcanic zone, which is here interpreted as an inherited crustal-scale transfer zone from a Miocene rift basin. At a local scale within the CAC, effusions are controlled by local structures that formed at the intersection of regional fault systems. The Central to Patagonian Andes transition occurs at the Callaqui-Copahue-Mandolegüe lineament, which decouples active deformation from the intra-arc strike-slip Liquiñe-Ofqui fault zone to the south and the backarc Copahue-Antiñir thrust system. © 2006 Elsevier Ltd. All rights reserved. |l eng | |
| 536 | |a Detalles de la financiación: SFB 267, PICT 059, PIP 4162 | ||
| 536 | |a Detalles de la financiación: This work has benefited from the following projects: DAAD IQN at University of Potsdam, PIP 4162 (Conicet) and PICT 059 for the “Study of the segment of normal subduction – 33° to 38°S,” GeoForschungsZentrum Potsdam Southern Andes project, and SFB 267 “Deformation Processes in the Andes.” DM is grateful to M. Strecker and O. Oncken for supporting his research. We thank G. Hermosilla, D. Iaffa, D. Yagupsky, S. Zlotnik, E. González-Díaz, J. Clavero, E. Godoy, D. Sellés, M. Rosenau, H. Echtler, V. Consoli, A. Sandoval, and P. Sruoga for their help in the field and fruitful discussions. Reviews of a previous version by J. Cembrano, J.M. Espíndola, and J. Muñoz, as well as journal reviewers L. Lara and Michael Ort, helped clarify the ideas presented in the text and improved the use of the English language. We also acknowledge the Universidad de Concepción, Chile, and the Universidad de Buenos Aires, Argentina, where the two first authors’ theses, on which this work is based, were developed. | ||
| 593 | |a GeoForschungsZentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany | ||
| 593 | |a Laboratorio de Tectónica Andina, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, CPC1428EHA Buenos Aires, Argentina | ||
| 690 | 1 | 0 | |a ANDES |
| 690 | 1 | 0 | |a ARC-PARALLEL FAULTS |
| 690 | 1 | 0 | |a OBLIQUE SUBDUCTION |
| 690 | 1 | 0 | |a TRANSFER ZONE |
| 690 | 1 | 0 | |a VOLCANOTECTONIC COMPLEX |
| 690 | 1 | 0 | |a CALDERA |
| 690 | 1 | 0 | |a ISLAND ARC |
| 690 | 1 | 0 | |a OBLIQUE FAULT |
| 690 | 1 | 0 | |a PILLOW LAVA |
| 690 | 1 | 0 | |a PYROCLASTIC FLOW |
| 690 | 1 | 0 | |a STRUCTURAL CONTROL |
| 690 | 1 | 0 | |a SUBDUCTION ZONE |
| 690 | 1 | 0 | |a TECTONIC SETTING |
| 690 | 1 | 0 | |a TRANSFER ZONE |
| 690 | 1 | 0 | |a VOLCANISM |
| 690 | 1 | 0 | |a VOLCANO |
| 690 | 1 | 0 | |a ANDES |
| 690 | 1 | 0 | |a CAVIAHUE |
| 690 | 1 | 0 | |a COPAHUE |
| 690 | 1 | 0 | |a PATAGONIA |
| 651 | 4 | |a ARGENTINA | |
| 651 | 4 | |a NEUQUEN | |
| 651 | 4 | |a SOUTH AMERICA | |
| 700 | 1 | |a Folguera, A. | |
| 700 | 1 | |a Ramos, V.A. | |
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