Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System
- Autores
- Costa, Carlos H.; Ahumada, Emilio Antonio; Gardini, Carlos Enrique; Vazquez, Fabricio Rodrigo; Diederix, Hans
- Año de publicación
- 2014
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- 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.
Fil: Costa, Carlos H.. Universidad Nacional de San Luis; Argentina
Fil: Ahumada, Emilio Antonio. Universidad Nacional de San Luis; Argentina
Fil: Gardini, Carlos Enrique. Universidad Nacional de San Luis; Argentina
Fil: Vazquez, Fabricio Rodrigo. Universidad Nacional de San Luis; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Diederix, Hans. Servicio Geológico Colombiano; Colombia - Materia
-
Neotectonics
Andean Front
Quaternary Thrusts
Argentine Precordillera - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/14026
Ver los metadatos del registro completo
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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 Técnicas2025-09-03T09:52:37Zoai: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:34982025-09-03 09:52:38.105CONICET 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 |
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 |
topic |
Neotectonics Andean Front Quaternary Thrusts Argentine Precordillera |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
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. Fil: Costa, Carlos H.. Universidad Nacional de San Luis; Argentina Fil: Ahumada, Emilio Antonio. Universidad Nacional de San Luis; Argentina Fil: Gardini, Carlos Enrique. Universidad Nacional de San Luis; Argentina Fil: Vazquez, Fabricio Rodrigo. Universidad Nacional de San Luis; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Diederix, Hans. Servicio Geológico Colombiano; Colombia |
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 |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
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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1842269172160004096 |
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13.13397 |