Fluvial deposits of the Diamante Formation as a record of the Late Cretaceous tectonic activity in the Southern Central Andes, Mendoza, Argentina

ABSTRACT The Upper Cretaceous nonmarine deposits of the Neuquén Basin have an important regional exposure. These deposits are included in the Neuquén Group, a well-studied unit in both the south and central part of the basin. However, the northernmost exposed between the Laguna del Diamante and the...

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Autores principales:	Gómez,Ricardo, Tunik,Maisa, Casadío,Silvio
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2020
Materias:	Neuquén Basin Diamante Formation Fluvial systems Detrital modes Andean orogen
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062020000200256
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spelling	oai:scielo:S0718-710620200002002562020-06-18Fluvial deposits of the Diamante Formation as a record of the Late Cretaceous tectonic activity in the Southern Central Andes, Mendoza, ArgentinaGómez,RicardoTunik,MaisaCasadío,Silvio Neuquén Basin Diamante Formation Fluvial systems Detrital modes Andean orogen ABSTRACT The Upper Cretaceous nonmarine deposits of the Neuquén Basin have an important regional exposure. These deposits are included in the Neuquén Group, a well-studied unit in both the south and central part of the basin. However, the northernmost exposed between the Laguna del Diamante and the Atuel River-assigned to the Diamante Formation-have not been studied in detail. In the studied area, the Diamante Formation corresponds to a braided fluvial system with moderate sinuosity evolving through time towards an anastomosing fluvial system. Petrographic analyses indicate that sandstones belong to feldspatic litharenites and litharenites, while the source area indicates provenance from both a recycled orogen and a transitional arc. The latter could be linked to the exhumation of the Andean orogen located to the west and to the input from the north-eastern border of the Neuquén Basin, represented by the rocks currently exposed in the San Rafael Block. On a macroscopic scale, the presence of calcareous lithic fragments in the mid and upper part of the surveyed stratigraphic section, strongly suggest an input from the west. This indicates an important change in the polarity of the basin and the presence of a deformation front located to the west of the study area in accordance to previous proposals in equivalent deposits to the south of study area.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.47 n.2 20202020-05-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062020000200256en10.5027/andgeov47n2-3218
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Neuquén Basin Diamante Formation Fluvial systems Detrital modes Andean orogen
spellingShingle	Neuquén Basin Diamante Formation Fluvial systems Detrital modes Andean orogen Gómez,Ricardo Tunik,Maisa Casadío,Silvio Fluvial deposits of the Diamante Formation as a record of the Late Cretaceous tectonic activity in the Southern Central Andes, Mendoza, Argentina
description	ABSTRACT The Upper Cretaceous nonmarine deposits of the Neuquén Basin have an important regional exposure. These deposits are included in the Neuquén Group, a well-studied unit in both the south and central part of the basin. However, the northernmost exposed between the Laguna del Diamante and the Atuel River-assigned to the Diamante Formation-have not been studied in detail. In the studied area, the Diamante Formation corresponds to a braided fluvial system with moderate sinuosity evolving through time towards an anastomosing fluvial system. Petrographic analyses indicate that sandstones belong to feldspatic litharenites and litharenites, while the source area indicates provenance from both a recycled orogen and a transitional arc. The latter could be linked to the exhumation of the Andean orogen located to the west and to the input from the north-eastern border of the Neuquén Basin, represented by the rocks currently exposed in the San Rafael Block. On a macroscopic scale, the presence of calcareous lithic fragments in the mid and upper part of the surveyed stratigraphic section, strongly suggest an input from the west. This indicates an important change in the polarity of the basin and the presence of a deformation front located to the west of the study area in accordance to previous proposals in equivalent deposits to the south of study area.
author	Gómez,Ricardo Tunik,Maisa Casadío,Silvio
author_facet	Gómez,Ricardo Tunik,Maisa Casadío,Silvio
author_sort	Gómez,Ricardo
title	Fluvial deposits of the Diamante Formation as a record of the Late Cretaceous tectonic activity in the Southern Central Andes, Mendoza, Argentina
title_short	Fluvial deposits of the Diamante Formation as a record of the Late Cretaceous tectonic activity in the Southern Central Andes, Mendoza, Argentina
title_full	Fluvial deposits of the Diamante Formation as a record of the Late Cretaceous tectonic activity in the Southern Central Andes, Mendoza, Argentina
title_fullStr	Fluvial deposits of the Diamante Formation as a record of the Late Cretaceous tectonic activity in the Southern Central Andes, Mendoza, Argentina
title_full_unstemmed	Fluvial deposits of the Diamante Formation as a record of the Late Cretaceous tectonic activity in the Southern Central Andes, Mendoza, Argentina
title_sort	fluvial deposits of the diamante formation as a record of the late cretaceous tectonic activity in the southern central andes, mendoza, argentina
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062020000200256
work_keys_str_mv	AT gomezricardo fluvialdepositsofthediamanteformationasarecordofthelatecretaceoustectonicactivityinthesoutherncentralandesmendozaargentina AT tunikmaisa fluvialdepositsofthediamanteformationasarecordofthelatecretaceoustectonicactivityinthesoutherncentralandesmendozaargentina AT casadiosilvio fluvialdepositsofthediamanteformationasarecordofthelatecretaceoustectonicactivityinthesoutherncentralandesmendozaargentina
_version_	1714205866849206272

Fluvial deposits of the Diamante Formation as a record of the Late Cretaceous tectonic activity in the Southern Central Andes, Mendoza, Argentina

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