New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina)

The Vinchina Formation is one of the thickest Cenozoic units related to the Andean orogeny in Argentina totaling more than 5100m in thickness. Different ages, from Eocene to latest Miocene, have been postulated for this red-bed succession based on fission track, magnetostratigraphy and whole rock is...

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Autores principales:	Ciccioli, Patricia Lucía, Limarino, Carlos Oscar, Marenssi, Sergio Alfredo
Publicado:	2014
Materias:	Andean foreland basin Miocene U-Pb ages Vinchina formation Andean orogeny Cenozoic depositional sequence Eocene fission track dating foreland basin lithostratigraphy magnetostratigraphy precision red bed unconformity uranium-lead dating Argentina La Rioja [Argentina]
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v56_n_p200_Ciccioli http://hdl.handle.net/20.500.12110/paper_08959811_v56_n_p200_Ciccioli
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_08959811_v56_n_p200_Ciccioli
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spelling	paper:paper_08959811_v56_n_p200_Ciccioli2023-06-08T15:48:45Z New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina) Ciccioli, Patricia Lucía Limarino, Carlos Oscar Marenssi, Sergio Alfredo Andean foreland basin Miocene U-Pb ages Vinchina formation Andean orogeny Cenozoic depositional sequence Eocene fission track dating foreland basin lithostratigraphy magnetostratigraphy Miocene precision red bed unconformity uranium-lead dating Argentina La Rioja [Argentina] The Vinchina Formation is one of the thickest Cenozoic units related to the Andean orogeny in Argentina totaling more than 5100m in thickness. Different ages, from Eocene to latest Miocene, have been postulated for this red-bed succession based on fission track, magnetostratigraphy and whole rock isotopic analyses. Two new high precision U-Pb zircon ages are reported herein for this unit. A maximum U-Pb age of 15.6±0.4Ma was obtained from detritic zircons collected from a thick tuffaceous interval of the Lower Member of the Vinchina Formation at La Cueva (Precordillera), while a depositional U-Pb age of 9.24±0.034Ma was derived from volcanic zircons collected from a thin tuff bed in the Upper Member at Quebrada de Los Pozuelos (Northwestern Sierras Pampeanas).At La Cueva, the Vinchina Formation unconformably overlies eolian sandstones of the Vallecito Formation and was divided into four units representing 1) deposits of high-sinuosity ephemeral rivers associated with 2) a playa-lake passing upwards to 3) low-sinuosity sandy ephemeral rivers and finally, 4) a gravelly-sandy braided plain. The tuffaceous level corresponding to unit 1 is located 280m above the base of the formation.At Quebrada de Los Pozuelos, the Vinchina Formation unconformably overlies the Vallecito Formation and is covered by a deeply incised surface at the base of the Toro Negro Formation. We divided the Vinchina Formation into four units. Unit 1 represents sedimentation in shallow fluvial channels with sandy to muddy floodplains. Units 2 and 3 record sedimentation in braided, meandering and anastomosing rivers. Finally unit 4 represents deposition in braided and wandering fluvial systems. The sampled tuff is located within unit 4at ~3470m above the base of the formation.The new ages indicate that the bulk of the Vinchina Formation is Miocene in age but they do not preclude a longer time span for the sedimentation of the whole unit. Ages of the sampled volcanic zircons match an important episode of volcanism recorded in the Cerro Las Tórtolas Formation, located ~90km to the west in the Andean Cordillera, but also the upper tuff could be related to the late Miocene Puna volcanism. Comparison of the new ages with previous chronological data suggests coetaneous sedimentation along different depocenters of the Bermejo basin (e.g., Vinchina and Talampaya depocenters in Western Sierras Pampeanas and La Troya depocenter and Huaco-Mogna sections in Precordillera) and strenghten the need for correlation among them. In addition the age of 15.6±0.4Ma constrains the end of the severe arid conditions recorded in the Sierras Pampeanas and Precordillera region. © 2014 Elsevier Ltd. Fil:Ciccioli, P.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Limarino, C.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Marenssi, S.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v56_n_p200_Ciccioli http://hdl.handle.net/20.500.12110/paper_08959811_v56_n_p200_Ciccioli
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Andean foreland basin Miocene U-Pb ages Vinchina formation Andean orogeny Cenozoic depositional sequence Eocene fission track dating foreland basin lithostratigraphy magnetostratigraphy Miocene precision red bed unconformity uranium-lead dating Argentina La Rioja [Argentina]
spellingShingle	Andean foreland basin Miocene U-Pb ages Vinchina formation Andean orogeny Cenozoic depositional sequence Eocene fission track dating foreland basin lithostratigraphy magnetostratigraphy Miocene precision red bed unconformity uranium-lead dating Argentina La Rioja [Argentina] Ciccioli, Patricia Lucía Limarino, Carlos Oscar Marenssi, Sergio Alfredo New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina)
topic_facet	Andean foreland basin Miocene U-Pb ages Vinchina formation Andean orogeny Cenozoic depositional sequence Eocene fission track dating foreland basin lithostratigraphy magnetostratigraphy Miocene precision red bed unconformity uranium-lead dating Argentina La Rioja [Argentina]
description	The Vinchina Formation is one of the thickest Cenozoic units related to the Andean orogeny in Argentina totaling more than 5100m in thickness. Different ages, from Eocene to latest Miocene, have been postulated for this red-bed succession based on fission track, magnetostratigraphy and whole rock isotopic analyses. Two new high precision U-Pb zircon ages are reported herein for this unit. A maximum U-Pb age of 15.6±0.4Ma was obtained from detritic zircons collected from a thick tuffaceous interval of the Lower Member of the Vinchina Formation at La Cueva (Precordillera), while a depositional U-Pb age of 9.24±0.034Ma was derived from volcanic zircons collected from a thin tuff bed in the Upper Member at Quebrada de Los Pozuelos (Northwestern Sierras Pampeanas).At La Cueva, the Vinchina Formation unconformably overlies eolian sandstones of the Vallecito Formation and was divided into four units representing 1) deposits of high-sinuosity ephemeral rivers associated with 2) a playa-lake passing upwards to 3) low-sinuosity sandy ephemeral rivers and finally, 4) a gravelly-sandy braided plain. The tuffaceous level corresponding to unit 1 is located 280m above the base of the formation.At Quebrada de Los Pozuelos, the Vinchina Formation unconformably overlies the Vallecito Formation and is covered by a deeply incised surface at the base of the Toro Negro Formation. We divided the Vinchina Formation into four units. Unit 1 represents sedimentation in shallow fluvial channels with sandy to muddy floodplains. Units 2 and 3 record sedimentation in braided, meandering and anastomosing rivers. Finally unit 4 represents deposition in braided and wandering fluvial systems. The sampled tuff is located within unit 4at ~3470m above the base of the formation.The new ages indicate that the bulk of the Vinchina Formation is Miocene in age but they do not preclude a longer time span for the sedimentation of the whole unit. Ages of the sampled volcanic zircons match an important episode of volcanism recorded in the Cerro Las Tórtolas Formation, located ~90km to the west in the Andean Cordillera, but also the upper tuff could be related to the late Miocene Puna volcanism. Comparison of the new ages with previous chronological data suggests coetaneous sedimentation along different depocenters of the Bermejo basin (e.g., Vinchina and Talampaya depocenters in Western Sierras Pampeanas and La Troya depocenter and Huaco-Mogna sections in Precordillera) and strenghten the need for correlation among them. In addition the age of 15.6±0.4Ma constrains the end of the severe arid conditions recorded in the Sierras Pampeanas and Precordillera region. © 2014 Elsevier Ltd.
author	Ciccioli, Patricia Lucía Limarino, Carlos Oscar Marenssi, Sergio Alfredo
author_facet	Ciccioli, Patricia Lucía Limarino, Carlos Oscar Marenssi, Sergio Alfredo
author_sort	Ciccioli, Patricia Lucía
title	New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina)
title_short	New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina)
title_full	New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina)
title_fullStr	New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina)
title_full_unstemmed	New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina)
title_sort	new high precision u-pb ages for the vinchina formation: implications for the stratigraphy of the bermejo andean foreland basin (la rioja province, western argentina)
publishDate	2014
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v56_n_p200_Ciccioli http://hdl.handle.net/20.500.12110/paper_08959811_v56_n_p200_Ciccioli
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New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina)

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