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Pyroclastic and lava vent-facies, from the Late Jurassic El Quemado Complex, are described at the southern Lake Ghío, in the Cordillera Patagónica Austral. Based on the comprehensive study of lithology and structures, the reconstruction of the volcanic architecture has been carried out. Four ignimbrites and one rhyolitic lava unit, affected by oblique-slip normal faults have been recognized. The evolution of La Peligrosa Caldera has been modeled in three different stages:1) initial collapse, consisting of a precursory downsag subsidence, related to a dilatational zone, which controlled the location of the caldera, 2) main collapse, with the emplacement of large volume crystal-rich ignimbrites and megabreccias, under a progressive subsidence controlled by a pull-apart structure related to a transtensional regime and 3) post-collapse, in which lava flows and associated domes were emplaced under an oblique-extensional regime. The caldera records a remarkable change from transtension to oblique extension, which may represent an important variation in regional deformation conditions during Jurassic times. La Peligrosa Caldera may be considered a key event to understand the eruptive mechanisms of the flare-up volcanism in the Chon Aike Silicic Province. © 2013 Elsevier B.V.


Documento: Artículo
Título:La Peligrosa caldera (47° 15'S, 71° 40'W): A key event during the Jurassic ignimbrite flare-up in Southern Patagonia, Argentina
Autor:Sruoga, P.; Japas, M.S.; Salani, F.M.; Kleiman, L.E.
Filiación:CONICET-SEGEMAR (Servicio Geológico y Minero Argentino), Av. Gral. Paz 5445, B1650WAB Buenos Aires, Argentina
CONICET-UBA(IGEBA), Depto. Cs. Geológicas, Pabellón II, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Gerencia de Exploración de Materias Primas, Comisión Nacional de Energía Atómica, Avda. del Libertador 8250, 1429 Buenos Aires, Argentina
Idioma: Inglés
Palabras clave:Ignimbrites; Megabreccia; South Chon Aike Silicic Province; Transtension; Different stages; Ignimbrites; Megabreccia; Oblique extension; Regional deformations; South Chon Aike Silicic Province; Structure-related; Transtension; Crystal structure; Lithology; Volcanoes; Subsidence; caldera; deformation mechanism; ignimbrite; Jurassic; lava flow; lithology; normal fault; pyroclastic flow; reconstruction; volcanology; Patagonia
Página de inicio:44
Página de fin:56
Título revista:Journal of Volcanology and Geothermal Research
Título revista abreviado:J. Volcanol. Geotherm. Res.


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---------- APA ----------
Sruoga, P., Japas, M.S., Salani, F.M. & Kleiman, L.E. (2014) . La Peligrosa caldera (47° 15'S, 71° 40'W): A key event during the Jurassic ignimbrite flare-up in Southern Patagonia, Argentina. Journal of Volcanology and Geothermal Research, 269, 44-56.
---------- CHICAGO ----------
Sruoga, P., Japas, M.S., Salani, F.M., Kleiman, L.E. "La Peligrosa caldera (47° 15'S, 71° 40'W): A key event during the Jurassic ignimbrite flare-up in Southern Patagonia, Argentina" . Journal of Volcanology and Geothermal Research 269 (2014) : 44-56.
---------- MLA ----------
Sruoga, P., Japas, M.S., Salani, F.M., Kleiman, L.E. "La Peligrosa caldera (47° 15'S, 71° 40'W): A key event during the Jurassic ignimbrite flare-up in Southern Patagonia, Argentina" . Journal of Volcanology and Geothermal Research, vol. 269, 2014, pp. 44-56.
---------- VANCOUVER ----------
Sruoga, P., Japas, M.S., Salani, F.M., Kleiman, L.E. La Peligrosa caldera (47° 15'S, 71° 40'W): A key event during the Jurassic ignimbrite flare-up in Southern Patagonia, Argentina. J. Volcanol. Geotherm. Res. 2014;269:44-56.