Stratigraphy and volcanic facies of the of the Valle del Cura Formation: Paleogene volcanism in the Frontal Cordillera of San Juan

A thick volcanic and volcaniclastic sequence, which includes epiclastic and pyroclastic facies, was recognized in the Valle del Cura region in the Frontal Cordillera of San Juan. The Valle del Cura Formation represent an important Eocene volcano-sedimentary episode composed of thick beds of tuff, co...

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Autores principales:	Litvak, V.D., Poma, S.
Formato:	JOUR
Materias:	Eocene Eruptive centers Frontal Cordillera Valle del Cura Volcanism facies frontal feature island arc Paleogene pyroclastic deposit stratigraphy volcanism Argentina Chile Metropolitana Rio Blanco Rio de la Sal San Juan [Argentina] South America Cura
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00044822_v60_n2_p402_Litvak
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00044822_v60_n2_p402_Litvak
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spelling	todo:paper_00044822_v60_n2_p402_Litvak2023-10-03T13:58:07Z Stratigraphy and volcanic facies of the of the Valle del Cura Formation: Paleogene volcanism in the Frontal Cordillera of San Juan Litvak, V.D. Poma, S. Eocene Eruptive centers Frontal Cordillera Valle del Cura Volcanism Eocene facies frontal feature island arc Paleogene pyroclastic deposit stratigraphy volcanism Argentina Chile Metropolitana Rio Blanco Rio de la Sal San Juan [Argentina] South America Valle del Cura Cura A thick volcanic and volcaniclastic sequence, which includes epiclastic and pyroclastic facies, was recognized in the Valle del Cura region in the Frontal Cordillera of San Juan. The Valle del Cura Formation represent an important Eocene volcano-sedimentary episode composed of thick beds of tuff, coarse conglomerate, coarse to middle lithic sandstone, volcanic sandstone and scarce shale. The volcanic levels include rhyolitic lavas and high-grade ignimbrites that represent strongly welded and high-temperature pyroclastic flows. The formation also includes thick pyroclastic flow deposits composed of crystalline, lithic and/ or glassy tuff, lapilli tuff, and even coarse facies such as volcanic breccia and agglomerate. Volcanic epiclastic facies interbedded within the pyroclastic deposit represent the reworked primary pyroclastic material. These pyroclastic flow deposits show features that reflect the proximity of its eruptive centre, which might be located in the southern end of the cordillera de la Brea. The Valle del Cura Formation can be correlated with the equivalent units exposed farther north at Río de la Sal and Río Blanco (Macho Muerto) and, chronologically, with the Bocatoma Unit intrusives that crop out to the west in Chile, emplaced along the Eocene magmatic front. By contrast, the Valle del Cura Formation represents intense volcanic activity developed in a back-arc setting. © 2005 Asociación Geológica Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v60_n2_p402_Litvak
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Eocene Eruptive centers Frontal Cordillera Valle del Cura Volcanism Eocene facies frontal feature island arc Paleogene pyroclastic deposit stratigraphy volcanism Argentina Chile Metropolitana Rio Blanco Rio de la Sal San Juan [Argentina] South America Valle del Cura Cura
spellingShingle	Eocene Eruptive centers Frontal Cordillera Valle del Cura Volcanism Eocene facies frontal feature island arc Paleogene pyroclastic deposit stratigraphy volcanism Argentina Chile Metropolitana Rio Blanco Rio de la Sal San Juan [Argentina] South America Valle del Cura Cura Litvak, V.D. Poma, S. Stratigraphy and volcanic facies of the of the Valle del Cura Formation: Paleogene volcanism in the Frontal Cordillera of San Juan
topic_facet	Eocene Eruptive centers Frontal Cordillera Valle del Cura Volcanism Eocene facies frontal feature island arc Paleogene pyroclastic deposit stratigraphy volcanism Argentina Chile Metropolitana Rio Blanco Rio de la Sal San Juan [Argentina] South America Valle del Cura Cura
description	A thick volcanic and volcaniclastic sequence, which includes epiclastic and pyroclastic facies, was recognized in the Valle del Cura region in the Frontal Cordillera of San Juan. The Valle del Cura Formation represent an important Eocene volcano-sedimentary episode composed of thick beds of tuff, coarse conglomerate, coarse to middle lithic sandstone, volcanic sandstone and scarce shale. The volcanic levels include rhyolitic lavas and high-grade ignimbrites that represent strongly welded and high-temperature pyroclastic flows. The formation also includes thick pyroclastic flow deposits composed of crystalline, lithic and/ or glassy tuff, lapilli tuff, and even coarse facies such as volcanic breccia and agglomerate. Volcanic epiclastic facies interbedded within the pyroclastic deposit represent the reworked primary pyroclastic material. These pyroclastic flow deposits show features that reflect the proximity of its eruptive centre, which might be located in the southern end of the cordillera de la Brea. The Valle del Cura Formation can be correlated with the equivalent units exposed farther north at Río de la Sal and Río Blanco (Macho Muerto) and, chronologically, with the Bocatoma Unit intrusives that crop out to the west in Chile, emplaced along the Eocene magmatic front. By contrast, the Valle del Cura Formation represents intense volcanic activity developed in a back-arc setting. © 2005 Asociación Geológica Argentina.
format	JOUR
author	Litvak, V.D. Poma, S.
author_facet	Litvak, V.D. Poma, S.
author_sort	Litvak, V.D.
title	Stratigraphy and volcanic facies of the of the Valle del Cura Formation: Paleogene volcanism in the Frontal Cordillera of San Juan
title_short	Stratigraphy and volcanic facies of the of the Valle del Cura Formation: Paleogene volcanism in the Frontal Cordillera of San Juan
title_full	Stratigraphy and volcanic facies of the of the Valle del Cura Formation: Paleogene volcanism in the Frontal Cordillera of San Juan
title_fullStr	Stratigraphy and volcanic facies of the of the Valle del Cura Formation: Paleogene volcanism in the Frontal Cordillera of San Juan
title_full_unstemmed	Stratigraphy and volcanic facies of the of the Valle del Cura Formation: Paleogene volcanism in the Frontal Cordillera of San Juan
title_sort	stratigraphy and volcanic facies of the of the valle del cura formation: paleogene volcanism in the frontal cordillera of san juan
url	http://hdl.handle.net/20.500.12110/paper_00044822_v60_n2_p402_Litvak
work_keys_str_mv	AT litvakvd stratigraphyandvolcanicfaciesoftheofthevalledelcuraformationpaleogenevolcanisminthefrontalcordilleraofsanjuan AT pomas stratigraphyandvolcanicfaciesoftheofthevalledelcuraformationpaleogenevolcanisminthefrontalcordilleraofsanjuan
_version_	1807317472432357376

Stratigraphy and volcanic facies of the of the Valle del Cura Formation: Paleogene volcanism in the Frontal Cordillera of San Juan

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