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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Autores principales: Sagripanti, L., Aguirre-Urreta, B., Folguera, A., Ramos, V.A.
Formato: SER
Materias:
basin evolution
Cretaceous
facies
foreland basin
marine sediment
Mesozoic
orogeny
outcrop
reverse fault
sediment core
slab
uplift
Argentina
Mendoza
Acceso en línea: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 todo:paper_03058719_v399_n_p203_Sagripanti
record_format dspace
spelling todo:paper_03058719_v399_n_p203_Sagripanti2023-10-03T15:22:05Z The Neocomian of Chachahuén (Mendoza, Argentina): Evidence of a broken foreland associated with the Payenia flat-slab Sagripanti, L. Aguirre-Urreta, B. Folguera, A. Ramos, V.A. 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. SER info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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
Sagripanti, L.
Aguirre-Urreta, B.
Folguera, A.
Ramos, V.A.
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.
format SER
author Sagripanti, L.
Aguirre-Urreta, B.
Folguera, A.
Ramos, V.A.
author_facet Sagripanti, L.
Aguirre-Urreta, B.
Folguera, A.
Ramos, V.A.
author_sort Sagripanti, L.
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
url http://hdl.handle.net/20.500.12110/paper_03058719_v399_n_p203_Sagripanti
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