Thrust belts of the southern Central Andes: Along-strike variations in shortening, topography, crustal geometry, and denudation

Autores
Giambiagi, Laura Beatriz; Mescua, Jose Francisco; Bechis, Florencia; Tassara Oddo, Andres Humberto; Hoke, Gregory D.
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The Andean fold-and-thrust belts of westcentral Argentina (33 S and 36 S), above the normal subduction segment, present important along-strike variations in mean topographic uplift, structural elevation, amount and rate of shortening, and crustal root geometry. To analyze the controlling factors of these latitudinal changes, we compare these parameters and the chronology of deformation along 11 balanced crustal cross sections across the thrust belts between 70 W and 69 W, where the majority of the uppercrustal deformation is concentrated, and reconstruct the Moho geometry along the transects. We propose two models of crustal deformation: a 33 40 S model, where the locus of upper-crustal shortening is aligned with respect to the maximum crustal thickness, and a 35 40 S model, where the uppercrustal shortening is uncoupled from the lower-crustal deformation and thickening. This degree of coupling between brittle upper crust and ductile lower crust deformation has strong influence on mean topographic ele vation. In the northern sector of the study area, an initial thick and felsic crust favors the coupling model, while in the southern sector, a thin and mafic lower crust allows the uncoupling model. Our results indicate that interplate dynamics may control the overall pattern of tectonic shortening; however, local variations in mean topographic elevation, deformation styles, and crustal root geometry are not fully explained and are more likely to be due to upper-plate lithospheric strength variations.
Fil: Giambiagi, Laura Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina
Fil: Mescua, Jose Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina
Fil: Bechis, Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio. Universidad Nacional de Río Negro. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio; Argentina
Fil: Tassara Oddo, Andres Humberto. Universidad de Concepción; Chile
Fil: Hoke, Gregory D.. Syracuse University; Estados Unidos
Materia
Mountain Building
Structural Shortening
Topographic Uplift
Tectonic Evolution
Crustal Deformation
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/58279
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/58279
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Thrust belts of the southern Central Andes: Along-strike variations in shortening, topography, crustal geometry, and denudationGiambiagi, Laura BeatrizMescua, Jose FranciscoBechis, FlorenciaTassara Oddo, Andres HumbertoHoke, Gregory D.Mountain BuildingStructural ShorteningTopographic UpliftTectonic EvolutionCrustal Deformationhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Andean fold-and-thrust belts of westcentral Argentina (33 S and 36 S), above the normal subduction segment, present important along-strike variations in mean topographic uplift, structural elevation, amount and rate of shortening, and crustal root geometry. To analyze the controlling factors of these latitudinal changes, we compare these parameters and the chronology of deformation along 11 balanced crustal cross sections across the thrust belts between 70 W and 69 W, where the majority of the uppercrustal deformation is concentrated, and reconstruct the Moho geometry along the transects. We propose two models of crustal deformation: a 33 40 S model, where the locus of upper-crustal shortening is aligned with respect to the maximum crustal thickness, and a 35 40 S model, where the uppercrustal shortening is uncoupled from the lower-crustal deformation and thickening. This degree of coupling between brittle upper crust and ductile lower crust deformation has strong influence on mean topographic ele vation. In the northern sector of the study area, an initial thick and felsic crust favors the coupling model, while in the southern sector, a thin and mafic lower crust allows the uncoupling model. Our results indicate that interplate dynamics may control the overall pattern of tectonic shortening; however, local variations in mean topographic elevation, deformation styles, and crustal root geometry are not fully explained and are more likely to be due to upper-plate lithospheric strength variations.Fil: Giambiagi, Laura Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Mescua, Jose Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Bechis, Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio. Universidad Nacional de Río Negro. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio; ArgentinaFil: Tassara Oddo, Andres Humberto. Universidad de Concepción; ChileFil: Hoke, Gregory D.. Syracuse University; Estados UnidosGeological Society of America2012-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/58279Giambiagi, Laura Beatriz; Mescua, Jose Francisco; Bechis, Florencia; Tassara Oddo, Andres Humberto; Hoke, Gregory D.; Thrust belts of the southern Central Andes: Along-strike variations in shortening, topography, crustal geometry, and denudation; Geological Society of America; Geological Society Of America Bulletin; 124; 7-8; 7-2012; 1339-13510016-7606CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/gsabulletin/article-lookup/124/7-8/1339info:eu-repo/semantics/altIdentifier/doi/10.1130/B30609.1info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:00:13Zoai:ri.conicet.gov.ar:11336/58279instacron: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 10:00:13.616CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Thrust belts of the southern Central Andes: Along-strike variations in shortening, topography, crustal geometry, and denudation
title Thrust belts of the southern Central Andes: Along-strike variations in shortening, topography, crustal geometry, and denudation
spellingShingle Thrust belts of the southern Central Andes: Along-strike variations in shortening, topography, crustal geometry, and denudation
Giambiagi, Laura Beatriz
Mountain Building
Structural Shortening
Topographic Uplift
Tectonic Evolution
Crustal Deformation
title_short Thrust belts of the southern Central Andes: Along-strike variations in shortening, topography, crustal geometry, and denudation
title_full Thrust belts of the southern Central Andes: Along-strike variations in shortening, topography, crustal geometry, and denudation
title_fullStr Thrust belts of the southern Central Andes: Along-strike variations in shortening, topography, crustal geometry, and denudation
title_full_unstemmed Thrust belts of the southern Central Andes: Along-strike variations in shortening, topography, crustal geometry, and denudation
title_sort Thrust belts of the southern Central Andes: Along-strike variations in shortening, topography, crustal geometry, and denudation
dc.creator.none.fl_str_mv Giambiagi, Laura Beatriz
Mescua, Jose Francisco
Bechis, Florencia
Tassara Oddo, Andres Humberto
Hoke, Gregory D.
author Giambiagi, Laura Beatriz
author_facet Giambiagi, Laura Beatriz
Mescua, Jose Francisco
Bechis, Florencia
Tassara Oddo, Andres Humberto
Hoke, Gregory D.
author_role author
author2 Mescua, Jose Francisco
Bechis, Florencia
Tassara Oddo, Andres Humberto
Hoke, Gregory D.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Mountain Building
Structural Shortening
Topographic Uplift
Tectonic Evolution
Crustal Deformation
topic Mountain Building
Structural Shortening
Topographic Uplift
Tectonic Evolution
Crustal Deformation
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 Andean fold-and-thrust belts of westcentral Argentina (33 S and 36 S), above the normal subduction segment, present important along-strike variations in mean topographic uplift, structural elevation, amount and rate of shortening, and crustal root geometry. To analyze the controlling factors of these latitudinal changes, we compare these parameters and the chronology of deformation along 11 balanced crustal cross sections across the thrust belts between 70 W and 69 W, where the majority of the uppercrustal deformation is concentrated, and reconstruct the Moho geometry along the transects. We propose two models of crustal deformation: a 33 40 S model, where the locus of upper-crustal shortening is aligned with respect to the maximum crustal thickness, and a 35 40 S model, where the uppercrustal shortening is uncoupled from the lower-crustal deformation and thickening. This degree of coupling between brittle upper crust and ductile lower crust deformation has strong influence on mean topographic ele vation. In the northern sector of the study area, an initial thick and felsic crust favors the coupling model, while in the southern sector, a thin and mafic lower crust allows the uncoupling model. Our results indicate that interplate dynamics may control the overall pattern of tectonic shortening; however, local variations in mean topographic elevation, deformation styles, and crustal root geometry are not fully explained and are more likely to be due to upper-plate lithospheric strength variations.
Fil: Giambiagi, Laura Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina
Fil: Mescua, Jose Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina
Fil: Bechis, Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio. Universidad Nacional de Río Negro. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio; Argentina
Fil: Tassara Oddo, Andres Humberto. Universidad de Concepción; Chile
Fil: Hoke, Gregory D.. Syracuse University; Estados Unidos
description The Andean fold-and-thrust belts of westcentral Argentina (33 S and 36 S), above the normal subduction segment, present important along-strike variations in mean topographic uplift, structural elevation, amount and rate of shortening, and crustal root geometry. To analyze the controlling factors of these latitudinal changes, we compare these parameters and the chronology of deformation along 11 balanced crustal cross sections across the thrust belts between 70 W and 69 W, where the majority of the uppercrustal deformation is concentrated, and reconstruct the Moho geometry along the transects. We propose two models of crustal deformation: a 33 40 S model, where the locus of upper-crustal shortening is aligned with respect to the maximum crustal thickness, and a 35 40 S model, where the uppercrustal shortening is uncoupled from the lower-crustal deformation and thickening. This degree of coupling between brittle upper crust and ductile lower crust deformation has strong influence on mean topographic ele vation. In the northern sector of the study area, an initial thick and felsic crust favors the coupling model, while in the southern sector, a thin and mafic lower crust allows the uncoupling model. Our results indicate that interplate dynamics may control the overall pattern of tectonic shortening; however, local variations in mean topographic elevation, deformation styles, and crustal root geometry are not fully explained and are more likely to be due to upper-plate lithospheric strength variations.
publishDate 2012
dc.date.none.fl_str_mv 2012-07
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/11336/58279
Giambiagi, Laura Beatriz; Mescua, Jose Francisco; Bechis, Florencia; Tassara Oddo, Andres Humberto; Hoke, Gregory D.; Thrust belts of the southern Central Andes: Along-strike variations in shortening, topography, crustal geometry, and denudation; Geological Society of America; Geological Society Of America Bulletin; 124; 7-8; 7-2012; 1339-1351
0016-7606
CONICET Digital
CONICET
url http://hdl.handle.net/11336/58279
identifier_str_mv Giambiagi, Laura Beatriz; Mescua, Jose Francisco; Bechis, Florencia; Tassara Oddo, Andres Humberto; Hoke, Gregory D.; Thrust belts of the southern Central Andes: Along-strike variations in shortening, topography, crustal geometry, and denudation; Geological Society of America; Geological Society Of America Bulletin; 124; 7-8; 7-2012; 1339-1351
0016-7606
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/gsabulletin/article-lookup/124/7-8/1339
info:eu-repo/semantics/altIdentifier/doi/10.1130/B30609.1
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
application/pdf
dc.publisher.none.fl_str_mv Geological Society of America
publisher.none.fl_str_mv Geological Society of America
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
_version_ 1842269625971113984
score 13.13397

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