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Abstract:

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.

Registro:

Documento: Artículo
Título:Structural control on arc volcanism: The Caviahue-Copahue complex, Central to Patagonian Andes transition (38°S)
Autor:Melnick, D.; Folguera, A.; Ramos, V.A.
Filiación:GeoForschungsZentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany
Laboratorio de Tectónica Andina, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, CPC1428EHA Buenos Aires, Argentina
Palabras clave:Andes; Arc-parallel faults; Oblique subduction; Transfer zone; Volcanotectonic complex; caldera; island arc; oblique fault; pillow lava; pyroclastic flow; structural control; subduction zone; tectonic setting; transfer zone; volcanism; volcano; Andes; Argentina; Caviahue; Copahue; Neuquen; Patagonia; South America
Año:2006
Volumen:22
Número:1-2
Página de inicio:66
Página de fin:88
DOI: http://dx.doi.org/10.1016/j.jsames.2006.08.008
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v22_n1-2_p66_Melnick

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Citas:

---------- APA ----------
Melnick, D., Folguera, A. & Ramos, V.A. (2006) . Structural control on arc volcanism: The Caviahue-Copahue complex, Central to Patagonian Andes transition (38°S). Journal of South American Earth Sciences, 22(1-2), 66-88.
http://dx.doi.org/10.1016/j.jsames.2006.08.008
---------- CHICAGO ----------
Melnick, D., Folguera, A., Ramos, V.A. "Structural control on arc volcanism: The Caviahue-Copahue complex, Central to Patagonian Andes transition (38°S)" . Journal of South American Earth Sciences 22, no. 1-2 (2006) : 66-88.
http://dx.doi.org/10.1016/j.jsames.2006.08.008
---------- MLA ----------
Melnick, D., Folguera, A., Ramos, V.A. "Structural control on arc volcanism: The Caviahue-Copahue complex, Central to Patagonian Andes transition (38°S)" . Journal of South American Earth Sciences, vol. 22, no. 1-2, 2006, pp. 66-88.
http://dx.doi.org/10.1016/j.jsames.2006.08.008
---------- VANCOUVER ----------
Melnick, D., Folguera, A., Ramos, V.A. Structural control on arc volcanism: The Caviahue-Copahue complex, Central to Patagonian Andes transition (38°S). J. South Am. Earth Sci. 2006;22(1-2):66-88.
http://dx.doi.org/10.1016/j.jsames.2006.08.008