Lithospheric structure of the Central Andes based on a 3D gravimetric model

We developed a 3D density model of the conti nental crust, the subducted plate and the upper mantle of the Central Andes between 20-29°S and 74-61°W through the forward modelling of Bouguer anomaly. The goal of this contribution is to gain insight on the lithospheric structure of the area, integrati...

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Autores principales: Prezzi, C.B., Götze, H.-J.
Formato: JOUR
Materias:
Central Andes
Convergent continental margins
Gavity anomalies
Lithospheric structure
Bouguer anomaly
continental crust
continental margin
convergent margin
forward modeling
gravimetry
lithospheric structure
Moho
three-dimensional modeling
Andes
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v65_n1_p81_Prezzi
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00044822_v65_n1_p81_Prezzi2023-10-03T13:58:33Z Lithospheric structure of the Central Andes based on a 3D gravimetric model Prezzi, C.B. Götze, H.-J. Central Andes Convergent continental margins Gavity anomalies Lithospheric structure Bouguer anomaly continental crust continental margin convergent margin forward modeling gravimetry lithospheric structure Moho three-dimensional modeling Andes We developed a 3D density model of the conti nental crust, the subducted plate and the upper mantle of the Central Andes between 20-29°S and 74-61°W through the forward modelling of Bouguer anomaly. The goal of this contribution is to gain insight on the lithospheric structure of the area, integrating the available information (geophysical, geologic, petrologic, and geochemical) in a single model. The geometry of our model is defined and constrained by hypocenters location, reflection and refraction seismic lines, travel time and attenuation tomography, receiver function analysis, magnetotelluric studies, thermal models and structural cross sections. The densities allocated to the different bodies were calculated considering petrologic and geochemical data and pressure and temperature conditions. The model consists of 31 parallel E-W vertical planes, where the continental crust comprises distinct bodies, which represent the different morphotectonic units of the Central Andes. Contour maps of the depth to the top of the subducted plate, the depth of the continental Moho and the depth to the top of the asthenosphere below South America were produced. The residual anomaly was calculated by subtracting from the Bouguer anomaly the gravimetric effect of the modelled subducted slab and of the modelled Moho. This study demonstrates how 3D gravity modelling, integrating geophysical, geologic and petrologic information, can help to reveal the lithospheric structure of the Central Andes. Fil:Prezzi, C.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v65_n1_p81_Prezzi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Central Andes
Convergent continental margins
Gavity anomalies
Lithospheric structure
Bouguer anomaly
continental crust
continental margin
convergent margin
forward modeling
gravimetry
lithospheric structure
Moho
three-dimensional modeling
Andes
spellingShingle Central Andes
Convergent continental margins
Gavity anomalies
Lithospheric structure
Bouguer anomaly
continental crust
continental margin
convergent margin
forward modeling
gravimetry
lithospheric structure
Moho
three-dimensional modeling
Andes
Prezzi, C.B.
Götze, H.-J.
Lithospheric structure of the Central Andes based on a 3D gravimetric model
topic_facet Central Andes
Convergent continental margins
Gavity anomalies
Lithospheric structure
Bouguer anomaly
continental crust
continental margin
convergent margin
forward modeling
gravimetry
lithospheric structure
Moho
three-dimensional modeling
Andes
description We developed a 3D density model of the conti nental crust, the subducted plate and the upper mantle of the Central Andes between 20-29°S and 74-61°W through the forward modelling of Bouguer anomaly. The goal of this contribution is to gain insight on the lithospheric structure of the area, integrating the available information (geophysical, geologic, petrologic, and geochemical) in a single model. The geometry of our model is defined and constrained by hypocenters location, reflection and refraction seismic lines, travel time and attenuation tomography, receiver function analysis, magnetotelluric studies, thermal models and structural cross sections. The densities allocated to the different bodies were calculated considering petrologic and geochemical data and pressure and temperature conditions. The model consists of 31 parallel E-W vertical planes, where the continental crust comprises distinct bodies, which represent the different morphotectonic units of the Central Andes. Contour maps of the depth to the top of the subducted plate, the depth of the continental Moho and the depth to the top of the asthenosphere below South America were produced. The residual anomaly was calculated by subtracting from the Bouguer anomaly the gravimetric effect of the modelled subducted slab and of the modelled Moho. This study demonstrates how 3D gravity modelling, integrating geophysical, geologic and petrologic information, can help to reveal the lithospheric structure of the Central Andes.
format JOUR
author Prezzi, C.B.
Götze, H.-J.
author_facet Prezzi, C.B.
Götze, H.-J.
author_sort Prezzi, C.B.
title Lithospheric structure of the Central Andes based on a 3D gravimetric model
title_short Lithospheric structure of the Central Andes based on a 3D gravimetric model
title_full Lithospheric structure of the Central Andes based on a 3D gravimetric model
title_fullStr Lithospheric structure of the Central Andes based on a 3D gravimetric model
title_full_unstemmed Lithospheric structure of the Central Andes based on a 3D gravimetric model
title_sort lithospheric structure of the central andes based on a 3d gravimetric model
url http://hdl.handle.net/20.500.12110/paper_00044822_v65_n1_p81_Prezzi
work_keys_str_mv AT prezzicb lithosphericstructureofthecentralandesbasedona3dgravimetricmodel
AT gotzehj lithosphericstructureofthecentralandesbasedona3dgravimetricmodel
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