Holocene shortening rates of an Andean-front thrust, Southern Precordillera, Argentina

Autores
Costa, Carlos H.; Ahumada, Emilio Antonio; Vazquez, Fabricio Rodrigo; Krohling, Daniela Mariel Ines
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A significant part of the Quaternary shortening between the Chilean trench and the relative stable interior of the South American plate at the Pampean flat slab (27–33°S), has been accommodated at the eastern foothills of the Andes and mainly within a narrow neotectonic belt along the eastern side of the Argentine Precordillera. Tectonic geodesy results point out that this area is being shortened at a ~2–4 mm/a rate, whereas shortening rates estimated over longer time periods (1–20 Ma) suggest values ranging from 1 mm/a to 16 mm/a. Geomorphic and geologic evidence indicate that the east-directed Las Higueras Thrust System is one of the main structures that has accommodated Quaternary deformation at this section of the Andean orogenic front (32° 05′–32° 35′S). An outcrop exhibiting the thrust propagation into fluvial sediments allows the Holocene shortening rates at the northern end of this structure to be estimated, based on retrodeformation of Holocene strata and radiocarbon dating of two charcoal-bearing beds. Estimated shortening rates yielded mean values of 1.90 ± 0.28 mm/a for the last 4495 ± 143 cal yr BP and 1.53 ± 0.26 for the last 8245 ± 48 cal yr BP. These results pose some uncertainties due to the incompleteness of the exposed deformation at the hanging wall. However, they correspond to a key timescale which helps to bridge the gap between rates derived from the short-term GPS data and the longterm permanent deformation rates obtained through geologic studies. Although the estimated rates suggest that slip on the thrust could have accelerated during the last ~4 ka, more data are necessary to reliably address this key issue.
Fil: Costa, Carlos H.. Universidad Nacional de San Luis. Facultad de Cs.fisico Matemáticas y Naturales. Departamento de Geología; Argentina
Fil: Ahumada, Emilio Antonio. Universidad Nacional de San Luis. Facultad de Cs.humanas. Departamento Educación y Formación Docente; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Vazquez, Fabricio Rodrigo. Universidad Nacional de San Luis. Facultad de Cs.fisico Matemáticas y Naturales. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Krohling, Daniela Mariel Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Nacional del Litoral; Argentina
Materia
Andean Thrusts
Neotectonics
Holocene
Argentine Precordillera
Shortening Rates
Orogenic Front
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/16794
Acceder
id CONICETDig_ea99731e6f67ab99f1c406e20a6054b1
oai_identifier_str oai:ri.conicet.gov.ar:11336/16794
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Holocene shortening rates of an Andean-front thrust, Southern Precordillera, ArgentinaCosta, Carlos H.Ahumada, Emilio AntonioVazquez, Fabricio RodrigoKrohling, Daniela Mariel InesAndean ThrustsNeotectonicsHoloceneArgentine PrecordilleraShortening RatesOrogenic Fronthttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1A significant part of the Quaternary shortening between the Chilean trench and the relative stable interior of the South American plate at the Pampean flat slab (27–33°S), has been accommodated at the eastern foothills of the Andes and mainly within a narrow neotectonic belt along the eastern side of the Argentine Precordillera. Tectonic geodesy results point out that this area is being shortened at a ~2–4 mm/a rate, whereas shortening rates estimated over longer time periods (1–20 Ma) suggest values ranging from 1 mm/a to 16 mm/a. Geomorphic and geologic evidence indicate that the east-directed Las Higueras Thrust System is one of the main structures that has accommodated Quaternary deformation at this section of the Andean orogenic front (32° 05′–32° 35′S). An outcrop exhibiting the thrust propagation into fluvial sediments allows the Holocene shortening rates at the northern end of this structure to be estimated, based on retrodeformation of Holocene strata and radiocarbon dating of two charcoal-bearing beds. Estimated shortening rates yielded mean values of 1.90 ± 0.28 mm/a for the last 4495 ± 143 cal yr BP and 1.53 ± 0.26 for the last 8245 ± 48 cal yr BP. These results pose some uncertainties due to the incompleteness of the exposed deformation at the hanging wall. However, they correspond to a key timescale which helps to bridge the gap between rates derived from the short-term GPS data and the longterm permanent deformation rates obtained through geologic studies. Although the estimated rates suggest that slip on the thrust could have accelerated during the last ~4 ka, more data are necessary to reliably address this key issue.Fil: Costa, Carlos H.. Universidad Nacional de San Luis. Facultad de Cs.fisico Matemáticas y Naturales. Departamento de Geología; ArgentinaFil: Ahumada, Emilio Antonio. Universidad Nacional de San Luis. Facultad de Cs.humanas. Departamento Educación y Formación Docente; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Vazquez, Fabricio Rodrigo. Universidad Nacional de San Luis. Facultad de Cs.fisico Matemáticas y Naturales. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Krohling, Daniela Mariel Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Nacional del Litoral; ArgentinaElsevier2015-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/16794Costa, Carlos H.; Ahumada, Emilio Antonio; Vazquez, Fabricio Rodrigo; Krohling, Daniela Mariel Ines; Holocene shortening rates of an Andean-front thrust, Southern Precordillera, Argentina; Elsevier; Tectonophysics; 664; 9-2015; 191-2010040-1951enginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2015.09.017info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0040195115005181info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:27:20Zoai:ri.conicet.gov.ar:11336/16794instacron: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:34982025-09-29 10:27:20.977CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Holocene shortening rates of an Andean-front thrust, Southern Precordillera, Argentina
title Holocene shortening rates of an Andean-front thrust, Southern Precordillera, Argentina
spellingShingle Holocene shortening rates of an Andean-front thrust, Southern Precordillera, Argentina
Costa, Carlos H.
Andean Thrusts
Neotectonics
Holocene
Argentine Precordillera
Shortening Rates
Orogenic Front
title_short Holocene shortening rates of an Andean-front thrust, Southern Precordillera, Argentina
title_full Holocene shortening rates of an Andean-front thrust, Southern Precordillera, Argentina
title_fullStr Holocene shortening rates of an Andean-front thrust, Southern Precordillera, Argentina
title_full_unstemmed Holocene shortening rates of an Andean-front thrust, Southern Precordillera, Argentina
title_sort Holocene shortening rates of an Andean-front thrust, Southern Precordillera, Argentina
dc.creator.none.fl_str_mv Costa, Carlos H.
Ahumada, Emilio Antonio
Vazquez, Fabricio Rodrigo
Krohling, Daniela Mariel Ines
author Costa, Carlos H.
author_facet Costa, Carlos H.
Ahumada, Emilio Antonio
Vazquez, Fabricio Rodrigo
Krohling, Daniela Mariel Ines
author_role author
author2 Ahumada, Emilio Antonio
Vazquez, Fabricio Rodrigo
Krohling, Daniela Mariel Ines
author2_role author
author
author
dc.subject.none.fl_str_mv Andean Thrusts
Neotectonics
Holocene
Argentine Precordillera
Shortening Rates
Orogenic Front
topic Andean Thrusts
Neotectonics
Holocene
Argentine Precordillera
Shortening Rates
Orogenic Front
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv A significant part of the Quaternary shortening between the Chilean trench and the relative stable interior of the South American plate at the Pampean flat slab (27–33°S), has been accommodated at the eastern foothills of the Andes and mainly within a narrow neotectonic belt along the eastern side of the Argentine Precordillera. Tectonic geodesy results point out that this area is being shortened at a ~2–4 mm/a rate, whereas shortening rates estimated over longer time periods (1–20 Ma) suggest values ranging from 1 mm/a to 16 mm/a. Geomorphic and geologic evidence indicate that the east-directed Las Higueras Thrust System is one of the main structures that has accommodated Quaternary deformation at this section of the Andean orogenic front (32° 05′–32° 35′S). An outcrop exhibiting the thrust propagation into fluvial sediments allows the Holocene shortening rates at the northern end of this structure to be estimated, based on retrodeformation of Holocene strata and radiocarbon dating of two charcoal-bearing beds. Estimated shortening rates yielded mean values of 1.90 ± 0.28 mm/a for the last 4495 ± 143 cal yr BP and 1.53 ± 0.26 for the last 8245 ± 48 cal yr BP. These results pose some uncertainties due to the incompleteness of the exposed deformation at the hanging wall. However, they correspond to a key timescale which helps to bridge the gap between rates derived from the short-term GPS data and the longterm permanent deformation rates obtained through geologic studies. Although the estimated rates suggest that slip on the thrust could have accelerated during the last ~4 ka, more data are necessary to reliably address this key issue.
Fil: Costa, Carlos H.. Universidad Nacional de San Luis. Facultad de Cs.fisico Matemáticas y Naturales. Departamento de Geología; Argentina
Fil: Ahumada, Emilio Antonio. Universidad Nacional de San Luis. Facultad de Cs.humanas. Departamento Educación y Formación Docente; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Vazquez, Fabricio Rodrigo. Universidad Nacional de San Luis. Facultad de Cs.fisico Matemáticas y Naturales. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Krohling, Daniela Mariel Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Nacional del Litoral; Argentina
description A significant part of the Quaternary shortening between the Chilean trench and the relative stable interior of the South American plate at the Pampean flat slab (27–33°S), has been accommodated at the eastern foothills of the Andes and mainly within a narrow neotectonic belt along the eastern side of the Argentine Precordillera. Tectonic geodesy results point out that this area is being shortened at a ~2–4 mm/a rate, whereas shortening rates estimated over longer time periods (1–20 Ma) suggest values ranging from 1 mm/a to 16 mm/a. Geomorphic and geologic evidence indicate that the east-directed Las Higueras Thrust System is one of the main structures that has accommodated Quaternary deformation at this section of the Andean orogenic front (32° 05′–32° 35′S). An outcrop exhibiting the thrust propagation into fluvial sediments allows the Holocene shortening rates at the northern end of this structure to be estimated, based on retrodeformation of Holocene strata and radiocarbon dating of two charcoal-bearing beds. Estimated shortening rates yielded mean values of 1.90 ± 0.28 mm/a for the last 4495 ± 143 cal yr BP and 1.53 ± 0.26 for the last 8245 ± 48 cal yr BP. These results pose some uncertainties due to the incompleteness of the exposed deformation at the hanging wall. However, they correspond to a key timescale which helps to bridge the gap between rates derived from the short-term GPS data and the longterm permanent deformation rates obtained through geologic studies. Although the estimated rates suggest that slip on the thrust could have accelerated during the last ~4 ka, more data are necessary to reliably address this key issue.
publishDate 2015
dc.date.none.fl_str_mv 2015-09
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/11336/16794
Costa, Carlos H.; Ahumada, Emilio Antonio; Vazquez, Fabricio Rodrigo; Krohling, Daniela Mariel Ines; Holocene shortening rates of an Andean-front thrust, Southern Precordillera, Argentina; Elsevier; Tectonophysics; 664; 9-2015; 191-201
0040-1951
url http://hdl.handle.net/11336/16794
identifier_str_mv Costa, Carlos H.; Ahumada, Emilio Antonio; Vazquez, Fabricio Rodrigo; Krohling, Daniela Mariel Ines; Holocene shortening rates of an Andean-front thrust, Southern Precordillera, Argentina; Elsevier; Tectonophysics; 664; 9-2015; 191-201
0040-1951
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2015.09.017
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0040195115005181
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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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score 13.069144

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