La Peligrosa caldera (47° 15'S, 71° 40'W): A key event during the Jurassic ignimbrite flare-up in Southern Patagonia, Argentina
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 ignimbr...
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2014
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03770273_v269_n_p44_Sruoga http://hdl.handle.net/20.500.12110/paper_03770273_v269_n_p44_Sruoga |
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paper:paper_03770273_v269_n_p44_Sruoga2023-06-08T15:38:53Z La Peligrosa caldera (47° 15'S, 71° 40'W): A key event during the Jurassic ignimbrite flare-up in Southern Patagonia, Argentina Japas, Maria Silvia Salani, Flavia Maria Kleiman, Laura Elena 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 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. Fil:Japas, M.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Salani, F.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Kleiman, L.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03770273_v269_n_p44_Sruoga http://hdl.handle.net/20.500.12110/paper_03770273_v269_n_p44_Sruoga |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 Japas, Maria Silvia Salani, Flavia Maria Kleiman, Laura Elena La Peligrosa caldera (47° 15'S, 71° 40'W): A key event during the Jurassic ignimbrite flare-up in Southern Patagonia, Argentina |
| topic_facet |
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 |
| description |
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. |
| author |
Japas, Maria Silvia Salani, Flavia Maria Kleiman, Laura Elena |
| author_facet |
Japas, Maria Silvia Salani, Flavia Maria Kleiman, Laura Elena |
| author_sort |
Japas, Maria Silvia |
| title |
La Peligrosa caldera (47° 15'S, 71° 40'W): A key event during the Jurassic ignimbrite flare-up in Southern Patagonia, Argentina |
| title_short |
La Peligrosa caldera (47° 15'S, 71° 40'W): A key event during the Jurassic ignimbrite flare-up in Southern Patagonia, Argentina |
| title_full |
La Peligrosa caldera (47° 15'S, 71° 40'W): A key event during the Jurassic ignimbrite flare-up in Southern Patagonia, Argentina |
| title_fullStr |
La Peligrosa caldera (47° 15'S, 71° 40'W): A key event during the Jurassic ignimbrite flare-up in Southern Patagonia, Argentina |
| title_full_unstemmed |
La Peligrosa caldera (47° 15'S, 71° 40'W): A key event during the Jurassic ignimbrite flare-up in Southern Patagonia, Argentina |
| title_sort |
la peligrosa caldera (47° 15's, 71° 40'w): a key event during the jurassic ignimbrite flare-up in southern patagonia, argentina |
| publishDate |
2014 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03770273_v269_n_p44_Sruoga http://hdl.handle.net/20.500.12110/paper_03770273_v269_n_p44_Sruoga |
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| _version_ |
1768543327296159744 |