Cenozoic stratigraphy of the southern Salar de Antofalla region, northwestern Argentina

In the region of the southern Salar de Antofalla (Catamarca Province, northwestern Argentina), Late Eocene to Pliocene/(?)Pleistocene successions are exposed with thicknesses of up to 1,600 m. They consist of fluvial, lacustrine and eolian sediments with intercalations of pyroclastic rocks and lava...

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Autor principal:	Voss,Reno
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2002
Materias:	Tertiary Alluvial fan-playa-complexes Salar de Antofalla Southern Puna Northwestern Argentina
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082002000200002
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spelling	oai:scielo:S0716-020820020002000022003-03-04Cenozoic stratigraphy of the southern Salar de Antofalla region, northwestern ArgentinaVoss,Reno Tertiary Alluvial fan-playa-complexes Salar de Antofalla Southern Puna Northwestern Argentina In the region of the southern Salar de Antofalla (Catamarca Province, northwestern Argentina), Late Eocene to Pliocene/(?)Pleistocene successions are exposed with thicknesses of up to 1,600 m. They consist of fluvial, lacustrine and eolian sediments with intercalations of pyroclastic rocks and lava flows. The sedimentary deposits represent 'alluvial fan-playa-complexes' accumulated under a semi-arid to arid climate. From the Late Eocene to the Early Miocene, the sedimentation took place in broken-foreland basins, while from the Early Miocene to the Late Pliocene/(?)Early Pleistocene, the sediments mainly accumulated within compressional retroarc basins in which volcanoes partly formed additional basin boundaries. Seven stratigraphic units can be differentiated on the basis of different lithofacies, angular unconformities and different regional distributions: the Late Eocene to Early Miocene Quiñoas Formation, which can be subdivided into the Campo Negro Member, the Cadillo Member and the Aguada Member, the Early/(?)Middle Miocene Potrero Grande Formation, the Late Miocene Antofalla Formation, which can be subdivided into the Cajeros Member and Bordo Blanco Member, the Late Miocene Salina beds, the Late Miocene Pozuelos Formation (Orilla Member), the (?)Late Miocene/Early Pliocene Sijes Formation (Uncal Grande Member) and the Late Pliocene/(?)Early Pleistocene Singuel Formation (Agua Escondida Member). While the Quiñoas Formation, the Potrero Grande Formation, the Antofalla Formation and the Salina beds have been newly introduced, the strata which represent the other formations can be assigned to the existing stratigraphic division of the southern Puna. Owing to the fact that these strata had no lateral connection to the strata of their type localities, which crop out near the Salar Pastos Grandes, they were defined as lateral membersinfo:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Revista geológica de Chile v.29 n.2 20022002-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082002000200002en10.4067/S0716-02082002000200002
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Tertiary Alluvial fan-playa-complexes Salar de Antofalla Southern Puna Northwestern Argentina
spellingShingle	Tertiary Alluvial fan-playa-complexes Salar de Antofalla Southern Puna Northwestern Argentina Voss,Reno Cenozoic stratigraphy of the southern Salar de Antofalla region, northwestern Argentina
description	In the region of the southern Salar de Antofalla (Catamarca Province, northwestern Argentina), Late Eocene to Pliocene/(?)Pleistocene successions are exposed with thicknesses of up to 1,600 m. They consist of fluvial, lacustrine and eolian sediments with intercalations of pyroclastic rocks and lava flows. The sedimentary deposits represent 'alluvial fan-playa-complexes' accumulated under a semi-arid to arid climate. From the Late Eocene to the Early Miocene, the sedimentation took place in broken-foreland basins, while from the Early Miocene to the Late Pliocene/(?)Early Pleistocene, the sediments mainly accumulated within compressional retroarc basins in which volcanoes partly formed additional basin boundaries. Seven stratigraphic units can be differentiated on the basis of different lithofacies, angular unconformities and different regional distributions: the Late Eocene to Early Miocene Quiñoas Formation, which can be subdivided into the Campo Negro Member, the Cadillo Member and the Aguada Member, the Early/(?)Middle Miocene Potrero Grande Formation, the Late Miocene Antofalla Formation, which can be subdivided into the Cajeros Member and Bordo Blanco Member, the Late Miocene Salina beds, the Late Miocene Pozuelos Formation (Orilla Member), the (?)Late Miocene/Early Pliocene Sijes Formation (Uncal Grande Member) and the Late Pliocene/(?)Early Pleistocene Singuel Formation (Agua Escondida Member). While the Quiñoas Formation, the Potrero Grande Formation, the Antofalla Formation and the Salina beds have been newly introduced, the strata which represent the other formations can be assigned to the existing stratigraphic division of the southern Puna. Owing to the fact that these strata had no lateral connection to the strata of their type localities, which crop out near the Salar Pastos Grandes, they were defined as lateral members
author	Voss,Reno
author_facet	Voss,Reno
author_sort	Voss,Reno
title	Cenozoic stratigraphy of the southern Salar de Antofalla region, northwestern Argentina
title_short	Cenozoic stratigraphy of the southern Salar de Antofalla region, northwestern Argentina
title_full	Cenozoic stratigraphy of the southern Salar de Antofalla region, northwestern Argentina
title_fullStr	Cenozoic stratigraphy of the southern Salar de Antofalla region, northwestern Argentina
title_full_unstemmed	Cenozoic stratigraphy of the southern Salar de Antofalla region, northwestern Argentina
title_sort	cenozoic stratigraphy of the southern salar de antofalla region, northwestern argentina
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2002
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082002000200002
work_keys_str_mv	AT vossreno cenozoicstratigraphyofthesouthernsalardeantofallaregionnorthwesternargentina
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Cenozoic stratigraphy of the southern Salar de Antofalla region, northwestern Argentina

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