Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System

The NNW-trending Las Peñas Thrust System is one of the key structures along the Andean orogenic front between 32°15′ and 32°40′S in the Southern Precordillera of Argentina. This east-verging structure crops out over a distance of c. 40 km and provides one of the best opportunities for a detailed fie...

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Autores: Costa, Carlos H., Ahumada, Emilio Antonio, Gardini, Carlos Enrique, Vazquez, Fabricio Rodrigo, Diederix, Hans
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/14026
Acceso en línea:http://hdl.handle.net/11336/14026
Access Level:acceso abierto
Palabra clave:Neotectonics
Andean Front
Quaternary Thrusts
Argentine Precordillera
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
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repository_id_str
spelling Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust SystemCosta, Carlos H.Ahumada, Emilio AntonioGardini, Carlos EnriqueVazquez, Fabricio RodrigoDiederix, HansNeotectonicsAndean FrontQuaternary ThrustsArgentine Precordillerahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The NNW-trending Las Peñas Thrust System is one of the key structures along the Andean orogenic front between 32°15′ and 32°40′S in the Southern Precordillera of Argentina. This east-verging structure crops out over a distance of c. 40 km and provides one of the best opportunities for a detailed field survey of Quaternary thrusting in the Andean frontal deformation zone. We present a systematic description of the geometry and geomorphic signatures of the main thrust deformation zone, which emplaces Neogene rocks over Quaternary alluvium, and usually behaves as a blind propagating thrust into the youngest (Late Pleistocene–Holocene) alluvial deposits. The Las Peñas Thrust System is understood to represent the latest stage of the eastward migration of an imbricated fan structure, which has driven the neotectonic uplift of the Las Peñas–Las Higueras range. Excellent outcrops provided by well-incised creek outlets reveal that the thrust system is made up either by a single fault surface or by two or more frontal splays. Several sections along its length can be differentiated on the basis of thrust geometries and/or morphotectonic features. The northern sections are characterized by isolated outcrops of Neogene rocks in the hanging wall, surrounded by alluvial bajadas. Remnants of fold limbs scarps depict the geomorphic signature of the thrust propagation into the Quaternary layers, although the preserved topographic relief always underestimates the cumulated thrust slip during the Quaternary. The southern part of this thrust system is defined by a frontal range, cored by a transposed south-plunging anticline in bedrock. Our observations suggest a dynamic and unsteady interaction between thrust propagation and sedimentation/erosion processes along the thrust trace during deposition of the Quaternary alluvial layers.Fil: Costa, Carlos H.. Universidad Nacional de San Luis; ArgentinaFil: Ahumada, Emilio Antonio. Universidad Nacional de San Luis; ArgentinaFil: Gardini, Carlos Enrique. Universidad Nacional de San Luis; ArgentinaFil: Vazquez, Fabricio Rodrigo. Universidad Nacional de San Luis; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Diederix, Hans. Servicio Geológico Colombiano; ColombiaLyell Collection2014-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/14026Costa, Carlos H.; Ahumada, Emilio Antonio; Gardini, Carlos Enrique; Vazquez, Fabricio Rodrigo; Diederix, Hans; Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System; Lyell Collection; Geological Society Of London Special Publication; 399; 1; 6-2014; 245-2660305-8719enginfo:eu-repo/semantics/altIdentifier/url/http://sp.lyellcollection.org/content/early/2014/02/05/SP399.5info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T13:46:41Zoai:ri.conicet.gov.ar:11336/14026instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982024-05-08 13:46:41.791CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System
title Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System
spellingShingle Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System
Costa, Carlos H.
Neotectonics
Andean Front
Quaternary Thrusts
Argentine Precordillera
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
title_short Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System
title_full Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System
title_fullStr Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System
title_full_unstemmed Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System
title_sort Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System
dc.creator.none.fl_str_mv Costa, Carlos H.
Ahumada, Emilio Antonio
Gardini, Carlos Enrique
Vazquez, Fabricio Rodrigo
Diederix, Hans
author Costa, Carlos H.
author_facet Costa, Carlos H.
Ahumada, Emilio Antonio
Gardini, Carlos Enrique
Vazquez, Fabricio Rodrigo
Diederix, Hans
author_role author
author2 Ahumada, Emilio Antonio
Gardini, Carlos Enrique
Vazquez, Fabricio Rodrigo
Diederix, Hans
author2_role author
author
author
author
dc.subject.none.fl_str_mv Neotectonics
Andean Front
Quaternary Thrusts
Argentine Precordillera
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
topic Neotectonics
Andean Front
Quaternary Thrusts
Argentine Precordillera
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
description The NNW-trending Las Peñas Thrust System is one of the key structures along the Andean orogenic front between 32°15′ and 32°40′S in the Southern Precordillera of Argentina. This east-verging structure crops out over a distance of c. 40 km and provides one of the best opportunities for a detailed field survey of Quaternary thrusting in the Andean frontal deformation zone. We present a systematic description of the geometry and geomorphic signatures of the main thrust deformation zone, which emplaces Neogene rocks over Quaternary alluvium, and usually behaves as a blind propagating thrust into the youngest (Late Pleistocene–Holocene) alluvial deposits. The Las Peñas Thrust System is understood to represent the latest stage of the eastward migration of an imbricated fan structure, which has driven the neotectonic uplift of the Las Peñas–Las Higueras range. Excellent outcrops provided by well-incised creek outlets reveal that the thrust system is made up either by a single fault surface or by two or more frontal splays. Several sections along its length can be differentiated on the basis of thrust geometries and/or morphotectonic features. The northern sections are characterized by isolated outcrops of Neogene rocks in the hanging wall, surrounded by alluvial bajadas. Remnants of fold limbs scarps depict the geomorphic signature of the thrust propagation into the Quaternary layers, although the preserved topographic relief always underestimates the cumulated thrust slip during the Quaternary. The southern part of this thrust system is defined by a frontal range, cored by a transposed south-plunging anticline in bedrock. Our observations suggest a dynamic and unsteady interaction between thrust propagation and sedimentation/erosion processes along the thrust trace during deposition of the Quaternary alluvial layers.
publishDate 2014
dc.date.none.fl_str_mv 2014-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/14026
Costa, Carlos H.; Ahumada, Emilio Antonio; Gardini, Carlos Enrique; Vazquez, Fabricio Rodrigo; Diederix, Hans; Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System; Lyell Collection; Geological Society Of London Special Publication; 399; 1; 6-2014; 245-266
0305-8719
url http://hdl.handle.net/11336/14026
identifier_str_mv Costa, Carlos H.; Ahumada, Emilio Antonio; Gardini, Carlos Enrique; Vazquez, Fabricio Rodrigo; Diederix, Hans; Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System; Lyell Collection; Geological Society Of London Special Publication; 399; 1; 6-2014; 245-266
0305-8719
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://sp.lyellcollection.org/content/early/2014/02/05/SP399.5
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Lyell Collection
publisher.none.fl_str_mv Lyell Collection
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 15,811543

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