Retroarc volcanism in the northern San Rafael Block (34°-35°30′S), southern Central Andes: Occurrence, age, and tectonic setting

One of the major retroarc volcanic provinces in the southern Central Andes (34° and 37°S) is developed in the Andean foothills of the San Rafael region between the orogenic front and foreland basement uplifts of Late Miocene age. Here we present the first comprehensive geochronological study of the...

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Autores principales:	Folguera, A., Naranjo, J.A., Orihashi, Y., Sumino, H., Nagao, K., Polanco, E., Ramos, V.A.
Formato:	JOUR
Materias:	back arc extension K-Ar dating Mendoza Payenia retroarc basalts volcanoes Basalt Geochronology Stratigraphy Tectonics Volcanoes Back-arc extensions Extensional collapse Fold-and-thrust belts Quaternary volcanisms Spatiotemporal distributions Potassium compounds age determination basalt biostratigraphy extensional tectonics fold and thrust belt foreland basin orogeny Pleistocene-Holocene boundary potassium-argon dating radiocarbon dating tectonic evolution tectonic setting tephrochronology uplift volcanic eruption volcanism Andes Argentina San Rafael [Mendoza] South America
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_03770273_v186_n3-4_p169_Folguera
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_03770273_v186_n3-4_p169_Folguera2023-10-03T15:31:20Z Retroarc volcanism in the northern San Rafael Block (34°-35°30′S), southern Central Andes: Occurrence, age, and tectonic setting Folguera, A. Naranjo, J.A. Orihashi, Y. Sumino, H. Nagao, K. Polanco, E. Ramos, V.A. back arc extension K-Ar dating Mendoza Payenia retroarc basalts volcanoes Basalt Geochronology Stratigraphy Tectonics Volcanoes Back-arc extensions Extensional collapse Fold-and-thrust belts K-Ar dating Mendoza Payenia Quaternary volcanisms Spatiotemporal distributions Potassium compounds age determination basalt biostratigraphy extensional tectonics fold and thrust belt foreland basin orogeny Pleistocene-Holocene boundary potassium-argon dating radiocarbon dating tectonic evolution tectonic setting tephrochronology uplift volcanic eruption volcanism Andes Argentina Mendoza San Rafael [Mendoza] South America One of the major retroarc volcanic provinces in the southern Central Andes (34° and 37°S) is developed in the Andean foothills of the San Rafael region between the orogenic front and foreland basement uplifts of Late Miocene age. Here we present the first comprehensive geochronological study of the Quaternary volcanism, previously dated mainly on the basis of stratigraphy. The new unspiked K-Ar radiometric and two radiocarbon determinations encompass many volcanic centers, most of them monogenetic and of basaltic composition exposed between 34° and 35°30′S. The data constrains the basaltic volcanism to between ~ 1.8 Ma and the Holocene. The spatiotemporal distribution of the ages indicates that eruption in the retroarc was episodic with some distinct patterns. The orogenic front of the San Rafael Block is associated with 1.8-0.7 Ma volcanic eruptions, while the Malargüe fold and thrust belt front in the Andean foothills is related to younger eruptions produced at 0.1-0.01 Ma. Both areas are associated with Late Cenozoic normal faults that dismembered an uplifted a Late Miocene peneplain as indicated by younger over older fault-relationships between Paleozoic rocks and Tertiary strata. This linkage indicates a major relationship between Pleistocene-Holocene retroarc eruptions of the basaltic centers, and extensional collapse of the foreland region, that shows a migration of the last volcanic activity towards the trench. © 2009 Elsevier B.V. All rights reserved. Fil:Folguera, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ramos, V.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03770273_v186_n3-4_p169_Folguera
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	back arc extension K-Ar dating Mendoza Payenia retroarc basalts volcanoes Basalt Geochronology Stratigraphy Tectonics Volcanoes Back-arc extensions Extensional collapse Fold-and-thrust belts K-Ar dating Mendoza Payenia Quaternary volcanisms Spatiotemporal distributions Potassium compounds age determination basalt biostratigraphy extensional tectonics fold and thrust belt foreland basin orogeny Pleistocene-Holocene boundary potassium-argon dating radiocarbon dating tectonic evolution tectonic setting tephrochronology uplift volcanic eruption volcanism Andes Argentina Mendoza San Rafael [Mendoza] South America
spellingShingle	back arc extension K-Ar dating Mendoza Payenia retroarc basalts volcanoes Basalt Geochronology Stratigraphy Tectonics Volcanoes Back-arc extensions Extensional collapse Fold-and-thrust belts K-Ar dating Mendoza Payenia Quaternary volcanisms Spatiotemporal distributions Potassium compounds age determination basalt biostratigraphy extensional tectonics fold and thrust belt foreland basin orogeny Pleistocene-Holocene boundary potassium-argon dating radiocarbon dating tectonic evolution tectonic setting tephrochronology uplift volcanic eruption volcanism Andes Argentina Mendoza San Rafael [Mendoza] South America Folguera, A. Naranjo, J.A. Orihashi, Y. Sumino, H. Nagao, K. Polanco, E. Ramos, V.A. Retroarc volcanism in the northern San Rafael Block (34°-35°30′S), southern Central Andes: Occurrence, age, and tectonic setting
topic_facet	back arc extension K-Ar dating Mendoza Payenia retroarc basalts volcanoes Basalt Geochronology Stratigraphy Tectonics Volcanoes Back-arc extensions Extensional collapse Fold-and-thrust belts K-Ar dating Mendoza Payenia Quaternary volcanisms Spatiotemporal distributions Potassium compounds age determination basalt biostratigraphy extensional tectonics fold and thrust belt foreland basin orogeny Pleistocene-Holocene boundary potassium-argon dating radiocarbon dating tectonic evolution tectonic setting tephrochronology uplift volcanic eruption volcanism Andes Argentina Mendoza San Rafael [Mendoza] South America
description	One of the major retroarc volcanic provinces in the southern Central Andes (34° and 37°S) is developed in the Andean foothills of the San Rafael region between the orogenic front and foreland basement uplifts of Late Miocene age. Here we present the first comprehensive geochronological study of the Quaternary volcanism, previously dated mainly on the basis of stratigraphy. The new unspiked K-Ar radiometric and two radiocarbon determinations encompass many volcanic centers, most of them monogenetic and of basaltic composition exposed between 34° and 35°30′S. The data constrains the basaltic volcanism to between ~ 1.8 Ma and the Holocene. The spatiotemporal distribution of the ages indicates that eruption in the retroarc was episodic with some distinct patterns. The orogenic front of the San Rafael Block is associated with 1.8-0.7 Ma volcanic eruptions, while the Malargüe fold and thrust belt front in the Andean foothills is related to younger eruptions produced at 0.1-0.01 Ma. Both areas are associated with Late Cenozoic normal faults that dismembered an uplifted a Late Miocene peneplain as indicated by younger over older fault-relationships between Paleozoic rocks and Tertiary strata. This linkage indicates a major relationship between Pleistocene-Holocene retroarc eruptions of the basaltic centers, and extensional collapse of the foreland region, that shows a migration of the last volcanic activity towards the trench. © 2009 Elsevier B.V. All rights reserved.
format	JOUR
author	Folguera, A. Naranjo, J.A. Orihashi, Y. Sumino, H. Nagao, K. Polanco, E. Ramos, V.A.
author_facet	Folguera, A. Naranjo, J.A. Orihashi, Y. Sumino, H. Nagao, K. Polanco, E. Ramos, V.A.
author_sort	Folguera, A.
title	Retroarc volcanism in the northern San Rafael Block (34°-35°30′S), southern Central Andes: Occurrence, age, and tectonic setting
title_short	Retroarc volcanism in the northern San Rafael Block (34°-35°30′S), southern Central Andes: Occurrence, age, and tectonic setting
title_full	Retroarc volcanism in the northern San Rafael Block (34°-35°30′S), southern Central Andes: Occurrence, age, and tectonic setting
title_fullStr	Retroarc volcanism in the northern San Rafael Block (34°-35°30′S), southern Central Andes: Occurrence, age, and tectonic setting
title_full_unstemmed	Retroarc volcanism in the northern San Rafael Block (34°-35°30′S), southern Central Andes: Occurrence, age, and tectonic setting
title_sort	retroarc volcanism in the northern san rafael block (34°-35°30′s), southern central andes: occurrence, age, and tectonic setting
url	http://hdl.handle.net/20.500.12110/paper_03770273_v186_n3-4_p169_Folguera
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Retroarc volcanism in the northern San Rafael Block (34°-35°30′S), southern Central Andes: Occurrence, age, and tectonic setting

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