The Neocomian of Chachahuén (Mendoza, Argentina): Evidence of a broken foreland associated with the Payenia flat-slab

Isolated marine sedimentary Lower Cretaceous deposits crop out in the foreland of the Neuquén Basin, west-central Argentina. They are the result of an anomalous uplift of the Sierra de Chachahuén in the far foreland region. These outcrops are assigned to the Agrio Formation based on their rich fossi...

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Detalles Bibliográficos
Publicado:	2015
Materias:	basin evolution Cretaceous facies foreland basin marine sediment Mesozoic orogeny outcrop reverse fault sediment core slab uplift Argentina Mendoza
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v399_n_p203_Sagripanti http://hdl.handle.net/20.500.12110/paper_03058719_v399_n_p203_Sagripanti
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_03058719_v399_n_p203_Sagripanti
record_format	dspace
spelling	paper:paper_03058719_v399_n_p203_Sagripanti2023-06-08T15:30:59Z The Neocomian of Chachahuén (Mendoza, Argentina): Evidence of a broken foreland associated with the Payenia flat-slab basin evolution Cretaceous facies foreland basin marine sediment Mesozoic orogeny outcrop reverse fault sediment core slab uplift Argentina Mendoza Isolated marine sedimentary Lower Cretaceous deposits crop out in the foreland of the Neuquén Basin, west-central Argentina. They are the result of an anomalous uplift of the Sierra de Chachahuén in the far foreland region. These outcrops are assigned to the Agrio Formation based on their rich fossil contents. In particular, the study reveals a unique outcrop of continental facies along the eastern proximal margin of the basin that were known only from core wells, and constitutes the first exposed evidence at the surface. These deformed deposits are 70 km from the Andean orogenic front and present 2 km of local uplift produced by high-angle basement reverse faults that reactivated a previous Early Mesozoic rift system. The increase in compression was related to the decrease in the subduction angle. This fact, together with the expansion of the magmatic arc, controlled the Chachahuén calc-alkaline Late Miocene volcanic centre and the uplift of the Mesozoic deposits in the foreland. This broken foreland was associated with localized heating of the Miocene volcanic centre that produced the rising of the brittle-ductile transitions. This fact weakens the foreland area, which was broken by compression during the development of the Payenia flat-slab. © 2015 The Geological Society of London. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v399_n_p203_Sagripanti http://hdl.handle.net/20.500.12110/paper_03058719_v399_n_p203_Sagripanti
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	basin evolution Cretaceous facies foreland basin marine sediment Mesozoic orogeny outcrop reverse fault sediment core slab uplift Argentina Mendoza
spellingShingle	basin evolution Cretaceous facies foreland basin marine sediment Mesozoic orogeny outcrop reverse fault sediment core slab uplift Argentina Mendoza The Neocomian of Chachahuén (Mendoza, Argentina): Evidence of a broken foreland associated with the Payenia flat-slab
topic_facet	basin evolution Cretaceous facies foreland basin marine sediment Mesozoic orogeny outcrop reverse fault sediment core slab uplift Argentina Mendoza
description	Isolated marine sedimentary Lower Cretaceous deposits crop out in the foreland of the Neuquén Basin, west-central Argentina. They are the result of an anomalous uplift of the Sierra de Chachahuén in the far foreland region. These outcrops are assigned to the Agrio Formation based on their rich fossil contents. In particular, the study reveals a unique outcrop of continental facies along the eastern proximal margin of the basin that were known only from core wells, and constitutes the first exposed evidence at the surface. These deformed deposits are 70 km from the Andean orogenic front and present 2 km of local uplift produced by high-angle basement reverse faults that reactivated a previous Early Mesozoic rift system. The increase in compression was related to the decrease in the subduction angle. This fact, together with the expansion of the magmatic arc, controlled the Chachahuén calc-alkaline Late Miocene volcanic centre and the uplift of the Mesozoic deposits in the foreland. This broken foreland was associated with localized heating of the Miocene volcanic centre that produced the rising of the brittle-ductile transitions. This fact weakens the foreland area, which was broken by compression during the development of the Payenia flat-slab. © 2015 The Geological Society of London.
title	The Neocomian of Chachahuén (Mendoza, Argentina): Evidence of a broken foreland associated with the Payenia flat-slab
title_short	The Neocomian of Chachahuén (Mendoza, Argentina): Evidence of a broken foreland associated with the Payenia flat-slab
title_full	The Neocomian of Chachahuén (Mendoza, Argentina): Evidence of a broken foreland associated with the Payenia flat-slab
title_fullStr	The Neocomian of Chachahuén (Mendoza, Argentina): Evidence of a broken foreland associated with the Payenia flat-slab
title_full_unstemmed	The Neocomian of Chachahuén (Mendoza, Argentina): Evidence of a broken foreland associated with the Payenia flat-slab
title_sort	neocomian of chachahuén (mendoza, argentina): evidence of a broken foreland associated with the payenia flat-slab
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v399_n_p203_Sagripanti http://hdl.handle.net/20.500.12110/paper_03058719_v399_n_p203_Sagripanti
_version_	1768546444229214208

The Neocomian of Chachahuén (Mendoza, Argentina): Evidence of a broken foreland associated with the Payenia flat-slab

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