Lithospheric density structure of the southern Central Andes constrained by 3D data-integrative gravity modelling

Autores
Rodriguez Piceda, Constanza; Scheck Wenderoth, Magdalena; Gómez Dacal, María Laura; Bott, Judith; Prezzi, Claudia Beatriz; Strecker, Manfred R.
Año de publicación
2020
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The southern Central Andes (SCA) (between 27° S and 40° S) is bordered to the west by the convergent margin between the continental South American Plate and the oceanic Nazca Plate. The subduction angle along this margin is variable, as is the deformation of the upper plate. Between 33° S and 35° S, the subduction angle of the Nazca plate increases from sub-horizontal (< 5°) in the north to relatively steep (~ 30°) in the south. The SCA contain inherited lithological and structural heterogeneities within the crust that have been reactivated and overprinted since the onset of subduction and associated Cenozoic deformation within the Andean orogen. The distribution of the deformation within the SCA has often been attributed to the variations in the subduction angle and the reactivation of these inherited heterogeneities. However, the possible influence that the thickness and composition of the continental crust have had on both short-term and long-term deformation of the SCA is yet to be thoroughly investigated. For our investigations, we have derived density distributions and thicknesses for various layers that make up the lithosphere and evaluated their relationships with tectonic events that occurred over the history of the Andean orogeny and, in particular, investigated the short- and long-term nature of the present-day deformation processes. We established a 3D model of lithosphere beneath the orogen and its foreland (29° S–39° S) that is consistent with currently available geological and geophysical data, including the gravity data. The modelled crustal configuration and density distribution reveal spatial relationships with different tectonic domains: the crystalline crust in the orogen (the magmatic arc and the main orogenic wedge) is thicker (~ 55 km) and less dense (~ 2900 kg/m3) than in the forearc (~ 35 km, ~ 2975 kg/m3) and foreland (~ 30 km, ~ 3000 kg/m3). Crustal thickening in the orogen probably occurred as a result of stacking of low-density domains, while density and thickness variations beneath the forearc and foreland most likely reflect differences in the tectonic evolution of each area following crustal accretion. No clear spatial relationship exists between the density distribution within the lithosphere and previously proposed boundaries of crustal terranes accreted during the early Paleozoic. Areas with ongoing deformation show a spatial correlation with those areas that have the highest topographic gradients and where there are abrupt changes in the average crustal-density contrast. This suggests that the short-term deformation within the interior of the Andean orogen and its foreland is fundamentally influenced by the crustal composition and the relative thickness of different crustal layers. A thicker, denser, and potentially stronger lithosphere beneath the northern part of the SCA foreland is interpreted to have favoured a strong coupling between the Nazca and South American plates, facilitating the development of a sub-horizontal slab.
Fil: Rodriguez Piceda, Constanza. German Research Centre for Geosciences; Alemania. Universitat Potsdam; Alemania
Fil: Scheck Wenderoth, Magdalena. German Research Centre for Geosciences; Alemania. RWTH Aachen University; Alemania
Fil: Gómez Dacal, María Laura. German Research Centre for Geosciences; Alemania. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Bott, Judith. German Research Centre for Geosciences; Alemania
Fil: Prezzi, Claudia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Strecker, Manfred R.. German Research Centre for Geosciences; Alemania. Universitat Potsdam; Alemania
Materia
CENTRAL ANDES
CRUSTAL DENSITY
GRAVITY MODELLING
LITHOSPHERIC STRUCTURE
SUBDUCTION
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:11336/142322

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network_name_str CONICET Digital (CONICET)
spelling Lithospheric density structure of the southern Central Andes constrained by 3D data-integrative gravity modellingRodriguez Piceda, ConstanzaScheck Wenderoth, MagdalenaGómez Dacal, María LauraBott, JudithPrezzi, Claudia BeatrizStrecker, Manfred R.CENTRAL ANDESCRUSTAL DENSITYGRAVITY MODELLINGLITHOSPHERIC STRUCTURESUBDUCTIONhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The southern Central Andes (SCA) (between 27° S and 40° S) is bordered to the west by the convergent margin between the continental South American Plate and the oceanic Nazca Plate. The subduction angle along this margin is variable, as is the deformation of the upper plate. Between 33° S and 35° S, the subduction angle of the Nazca plate increases from sub-horizontal (< 5°) in the north to relatively steep (~ 30°) in the south. The SCA contain inherited lithological and structural heterogeneities within the crust that have been reactivated and overprinted since the onset of subduction and associated Cenozoic deformation within the Andean orogen. The distribution of the deformation within the SCA has often been attributed to the variations in the subduction angle and the reactivation of these inherited heterogeneities. However, the possible influence that the thickness and composition of the continental crust have had on both short-term and long-term deformation of the SCA is yet to be thoroughly investigated. For our investigations, we have derived density distributions and thicknesses for various layers that make up the lithosphere and evaluated their relationships with tectonic events that occurred over the history of the Andean orogeny and, in particular, investigated the short- and long-term nature of the present-day deformation processes. We established a 3D model of lithosphere beneath the orogen and its foreland (29° S–39° S) that is consistent with currently available geological and geophysical data, including the gravity data. The modelled crustal configuration and density distribution reveal spatial relationships with different tectonic domains: the crystalline crust in the orogen (the magmatic arc and the main orogenic wedge) is thicker (~ 55 km) and less dense (~ 2900 kg/m3) than in the forearc (~ 35 km, ~ 2975 kg/m3) and foreland (~ 30 km, ~ 3000 kg/m3). Crustal thickening in the orogen probably occurred as a result of stacking of low-density domains, while density and thickness variations beneath the forearc and foreland most likely reflect differences in the tectonic evolution of each area following crustal accretion. No clear spatial relationship exists between the density distribution within the lithosphere and previously proposed boundaries of crustal terranes accreted during the early Paleozoic. Areas with ongoing deformation show a spatial correlation with those areas that have the highest topographic gradients and where there are abrupt changes in the average crustal-density contrast. This suggests that the short-term deformation within the interior of the Andean orogen and its foreland is fundamentally influenced by the crustal composition and the relative thickness of different crustal layers. A thicker, denser, and potentially stronger lithosphere beneath the northern part of the SCA foreland is interpreted to have favoured a strong coupling between the Nazca and South American plates, facilitating the development of a sub-horizontal slab.Fil: Rodriguez Piceda, Constanza. German Research Centre for Geosciences; Alemania. Universitat Potsdam; AlemaniaFil: Scheck Wenderoth, Magdalena. German Research Centre for Geosciences; Alemania. RWTH Aachen University; AlemaniaFil: Gómez Dacal, María Laura. German Research Centre for Geosciences; Alemania. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Bott, Judith. German Research Centre for Geosciences; AlemaniaFil: Prezzi, Claudia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Strecker, Manfred R.. German Research Centre for Geosciences; Alemania. Universitat Potsdam; AlemaniaSpringer2020-12-21info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/142322Rodriguez Piceda, Constanza; Scheck Wenderoth, Magdalena; Gómez Dacal, María Laura; Bott, Judith; Prezzi, Claudia Beatriz; et al.; Lithospheric density structure of the southern Central Andes constrained by 3D data-integrative gravity modelling; Springer; International Journal of Earth Sciences; 110; 7; 21-12-2020; 2333-23591437-3254CONICET DigitalCONICETenghttp://hdl.handle.net/11336/184921info:eu-repo/semantics/altIdentifier/url/http://link.springer.com/10.1007/s00531-020-01962-1info:eu-repo/semantics/altIdentifier/doi/10.1007/s00531-020-01962-1info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:29:48Zoai:ri.conicet.gov.ar:11336/142322instacron: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 10:29:49.005CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Lithospheric density structure of the southern Central Andes constrained by 3D data-integrative gravity modelling
title Lithospheric density structure of the southern Central Andes constrained by 3D data-integrative gravity modelling
spellingShingle Lithospheric density structure of the southern Central Andes constrained by 3D data-integrative gravity modelling
Rodriguez Piceda, Constanza
CENTRAL ANDES
CRUSTAL DENSITY
GRAVITY MODELLING
LITHOSPHERIC STRUCTURE
SUBDUCTION
title_short Lithospheric density structure of the southern Central Andes constrained by 3D data-integrative gravity modelling
title_full Lithospheric density structure of the southern Central Andes constrained by 3D data-integrative gravity modelling
title_fullStr Lithospheric density structure of the southern Central Andes constrained by 3D data-integrative gravity modelling
title_full_unstemmed Lithospheric density structure of the southern Central Andes constrained by 3D data-integrative gravity modelling
title_sort Lithospheric density structure of the southern Central Andes constrained by 3D data-integrative gravity modelling
dc.creator.none.fl_str_mv Rodriguez Piceda, Constanza
Scheck Wenderoth, Magdalena
Gómez Dacal, María Laura
Bott, Judith
Prezzi, Claudia Beatriz
Strecker, Manfred R.
author Rodriguez Piceda, Constanza
author_facet Rodriguez Piceda, Constanza
Scheck Wenderoth, Magdalena
Gómez Dacal, María Laura
Bott, Judith
Prezzi, Claudia Beatriz
Strecker, Manfred R.
author_role author
author2 Scheck Wenderoth, Magdalena
Gómez Dacal, María Laura
Bott, Judith
Prezzi, Claudia Beatriz
Strecker, Manfred R.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv CENTRAL ANDES
CRUSTAL DENSITY
GRAVITY MODELLING
LITHOSPHERIC STRUCTURE
SUBDUCTION
topic CENTRAL ANDES
CRUSTAL DENSITY
GRAVITY MODELLING
LITHOSPHERIC STRUCTURE
SUBDUCTION
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 southern Central Andes (SCA) (between 27° S and 40° S) is bordered to the west by the convergent margin between the continental South American Plate and the oceanic Nazca Plate. The subduction angle along this margin is variable, as is the deformation of the upper plate. Between 33° S and 35° S, the subduction angle of the Nazca plate increases from sub-horizontal (< 5°) in the north to relatively steep (~ 30°) in the south. The SCA contain inherited lithological and structural heterogeneities within the crust that have been reactivated and overprinted since the onset of subduction and associated Cenozoic deformation within the Andean orogen. The distribution of the deformation within the SCA has often been attributed to the variations in the subduction angle and the reactivation of these inherited heterogeneities. However, the possible influence that the thickness and composition of the continental crust have had on both short-term and long-term deformation of the SCA is yet to be thoroughly investigated. For our investigations, we have derived density distributions and thicknesses for various layers that make up the lithosphere and evaluated their relationships with tectonic events that occurred over the history of the Andean orogeny and, in particular, investigated the short- and long-term nature of the present-day deformation processes. We established a 3D model of lithosphere beneath the orogen and its foreland (29° S–39° S) that is consistent with currently available geological and geophysical data, including the gravity data. The modelled crustal configuration and density distribution reveal spatial relationships with different tectonic domains: the crystalline crust in the orogen (the magmatic arc and the main orogenic wedge) is thicker (~ 55 km) and less dense (~ 2900 kg/m3) than in the forearc (~ 35 km, ~ 2975 kg/m3) and foreland (~ 30 km, ~ 3000 kg/m3). Crustal thickening in the orogen probably occurred as a result of stacking of low-density domains, while density and thickness variations beneath the forearc and foreland most likely reflect differences in the tectonic evolution of each area following crustal accretion. No clear spatial relationship exists between the density distribution within the lithosphere and previously proposed boundaries of crustal terranes accreted during the early Paleozoic. Areas with ongoing deformation show a spatial correlation with those areas that have the highest topographic gradients and where there are abrupt changes in the average crustal-density contrast. This suggests that the short-term deformation within the interior of the Andean orogen and its foreland is fundamentally influenced by the crustal composition and the relative thickness of different crustal layers. A thicker, denser, and potentially stronger lithosphere beneath the northern part of the SCA foreland is interpreted to have favoured a strong coupling between the Nazca and South American plates, facilitating the development of a sub-horizontal slab.
Fil: Rodriguez Piceda, Constanza. German Research Centre for Geosciences; Alemania. Universitat Potsdam; Alemania
Fil: Scheck Wenderoth, Magdalena. German Research Centre for Geosciences; Alemania. RWTH Aachen University; Alemania
Fil: Gómez Dacal, María Laura. German Research Centre for Geosciences; Alemania. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Bott, Judith. German Research Centre for Geosciences; Alemania
Fil: Prezzi, Claudia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Strecker, Manfred R.. German Research Centre for Geosciences; Alemania. Universitat Potsdam; Alemania
description The southern Central Andes (SCA) (between 27° S and 40° S) is bordered to the west by the convergent margin between the continental South American Plate and the oceanic Nazca Plate. The subduction angle along this margin is variable, as is the deformation of the upper plate. Between 33° S and 35° S, the subduction angle of the Nazca plate increases from sub-horizontal (< 5°) in the north to relatively steep (~ 30°) in the south. The SCA contain inherited lithological and structural heterogeneities within the crust that have been reactivated and overprinted since the onset of subduction and associated Cenozoic deformation within the Andean orogen. The distribution of the deformation within the SCA has often been attributed to the variations in the subduction angle and the reactivation of these inherited heterogeneities. However, the possible influence that the thickness and composition of the continental crust have had on both short-term and long-term deformation of the SCA is yet to be thoroughly investigated. For our investigations, we have derived density distributions and thicknesses for various layers that make up the lithosphere and evaluated their relationships with tectonic events that occurred over the history of the Andean orogeny and, in particular, investigated the short- and long-term nature of the present-day deformation processes. We established a 3D model of lithosphere beneath the orogen and its foreland (29° S–39° S) that is consistent with currently available geological and geophysical data, including the gravity data. The modelled crustal configuration and density distribution reveal spatial relationships with different tectonic domains: the crystalline crust in the orogen (the magmatic arc and the main orogenic wedge) is thicker (~ 55 km) and less dense (~ 2900 kg/m3) than in the forearc (~ 35 km, ~ 2975 kg/m3) and foreland (~ 30 km, ~ 3000 kg/m3). Crustal thickening in the orogen probably occurred as a result of stacking of low-density domains, while density and thickness variations beneath the forearc and foreland most likely reflect differences in the tectonic evolution of each area following crustal accretion. No clear spatial relationship exists between the density distribution within the lithosphere and previously proposed boundaries of crustal terranes accreted during the early Paleozoic. Areas with ongoing deformation show a spatial correlation with those areas that have the highest topographic gradients and where there are abrupt changes in the average crustal-density contrast. This suggests that the short-term deformation within the interior of the Andean orogen and its foreland is fundamentally influenced by the crustal composition and the relative thickness of different crustal layers. A thicker, denser, and potentially stronger lithosphere beneath the northern part of the SCA foreland is interpreted to have favoured a strong coupling between the Nazca and South American plates, facilitating the development of a sub-horizontal slab.
publishDate 2020
dc.date.none.fl_str_mv 2020-12-21
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/142322
Rodriguez Piceda, Constanza; Scheck Wenderoth, Magdalena; Gómez Dacal, María Laura; Bott, Judith; Prezzi, Claudia Beatriz; et al.; Lithospheric density structure of the southern Central Andes constrained by 3D data-integrative gravity modelling; Springer; International Journal of Earth Sciences; 110; 7; 21-12-2020; 2333-2359
1437-3254
CONICET Digital
CONICET
url http://hdl.handle.net/11336/142322
identifier_str_mv Rodriguez Piceda, Constanza; Scheck Wenderoth, Magdalena; Gómez Dacal, María Laura; Bott, Judith; Prezzi, Claudia Beatriz; et al.; Lithospheric density structure of the southern Central Andes constrained by 3D data-integrative gravity modelling; Springer; International Journal of Earth Sciences; 110; 7; 21-12-2020; 2333-2359
1437-3254
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv http://hdl.handle.net/11336/184921
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info:eu-repo/semantics/altIdentifier/doi/10.1007/s00531-020-01962-1
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