3D density model of the Central Andes
We developed a 3D density model of the continental 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 integrating the availab...
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2009
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319201_v177_n3-4_p217_Prezzi http://hdl.handle.net/20.500.12110/paper_00319201_v177_n3-4_p217_Prezzi |
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paper:paper_00319201_v177_n3-4_p217_Prezzi2023-06-08T14:58:52Z 3D density model of the Central Andes 3D density model Central Andes Gravity Lithospheric structure Atacama Attenuation tomography Bouguer anomaly Central Andes Continental crusts Contour map Density models Forward modelling Gain insight Geochemical data Gravity model Hypocentre Internal loads Lithospheric structure Low-velocity zone Lower crust Magnetotelluric studies Partial melt Partial melting Pressure and temperature Receiver function analysis Seismic lines Seismic studies South America Thermal model Travel time Upper mantle Vertical plane Analytical geochemistry Seismology Structural geology Tomography Three dimensional Bouguer anomaly continental crust crustal thickness geodynamics gravity field lithospheric structure lower crust Moho P-T conditions partial melting seismotectonics subduction zone tectonic plate tectonic setting three-dimensional modeling upper mantle Altiplano Andes Puna South America We developed a 3D density model of the continental 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 integrating the available information (geophysical, geologic, petrologic, and geochemical) in a single model. The geometry of our model is defined and constrained by hypocentre location, reflection and refraction on and offshore seismic lines, travel time and attenuation tomography, receiver function analysis, magnetotelluric studies, thermal models and balanced structural cross-sections. The densities allocated to the different bodies are 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. We include a partial melting zone at midcrustal depths under the Altiplano-Puna (low-velocity zone) and consider the presence of a rheologically strong block beneath the Salar de Atacama basin, according to recent seismic studies. Contour maps of the depth of the continental Moho, the thickness of the lower crust and the depth to the bottom of the lithosphere below South America are produced. The possible percentage of partial melt in the Central Andes low-velocity zone is estimated. The residual anomaly is calculated by subtracting from the Bouguer anomaly the gravimetric effect of the modelled subducted slab and of the modelled Moho. Isostatic anomalies are calculated from regional and local isostatic Mohos calculated with and without internal loads, derived from our gravity model, which are then compared to the modelled continental Moho. This study contributes to a more detailed knowledge of the lithospheric structure of this region of the Andes and provides an integrated 3D density model, which may be used by the geoscientific community as a tool that can help to understand and interpret the geodynamic features and processes acting along the Central Andes. © 2009 Elsevier B.V. All rights reserved. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319201_v177_n3-4_p217_Prezzi http://hdl.handle.net/20.500.12110/paper_00319201_v177_n3-4_p217_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 |
3D density model Central Andes Gravity Lithospheric structure Atacama Attenuation tomography Bouguer anomaly Central Andes Continental crusts Contour map Density models Forward modelling Gain insight Geochemical data Gravity model Hypocentre Internal loads Lithospheric structure Low-velocity zone Lower crust Magnetotelluric studies Partial melt Partial melting Pressure and temperature Receiver function analysis Seismic lines Seismic studies South America Thermal model Travel time Upper mantle Vertical plane Analytical geochemistry Seismology Structural geology Tomography Three dimensional Bouguer anomaly continental crust crustal thickness geodynamics gravity field lithospheric structure lower crust Moho P-T conditions partial melting seismotectonics subduction zone tectonic plate tectonic setting three-dimensional modeling upper mantle Altiplano Andes Puna South America |
| spellingShingle |
3D density model Central Andes Gravity Lithospheric structure Atacama Attenuation tomography Bouguer anomaly Central Andes Continental crusts Contour map Density models Forward modelling Gain insight Geochemical data Gravity model Hypocentre Internal loads Lithospheric structure Low-velocity zone Lower crust Magnetotelluric studies Partial melt Partial melting Pressure and temperature Receiver function analysis Seismic lines Seismic studies South America Thermal model Travel time Upper mantle Vertical plane Analytical geochemistry Seismology Structural geology Tomography Three dimensional Bouguer anomaly continental crust crustal thickness geodynamics gravity field lithospheric structure lower crust Moho P-T conditions partial melting seismotectonics subduction zone tectonic plate tectonic setting three-dimensional modeling upper mantle Altiplano Andes Puna South America 3D density model of the Central Andes |
| topic_facet |
3D density model Central Andes Gravity Lithospheric structure Atacama Attenuation tomography Bouguer anomaly Central Andes Continental crusts Contour map Density models Forward modelling Gain insight Geochemical data Gravity model Hypocentre Internal loads Lithospheric structure Low-velocity zone Lower crust Magnetotelluric studies Partial melt Partial melting Pressure and temperature Receiver function analysis Seismic lines Seismic studies South America Thermal model Travel time Upper mantle Vertical plane Analytical geochemistry Seismology Structural geology Tomography Three dimensional Bouguer anomaly continental crust crustal thickness geodynamics gravity field lithospheric structure lower crust Moho P-T conditions partial melting seismotectonics subduction zone tectonic plate tectonic setting three-dimensional modeling upper mantle Altiplano Andes Puna South America |
| description |
We developed a 3D density model of the continental 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 integrating the available information (geophysical, geologic, petrologic, and geochemical) in a single model. The geometry of our model is defined and constrained by hypocentre location, reflection and refraction on and offshore seismic lines, travel time and attenuation tomography, receiver function analysis, magnetotelluric studies, thermal models and balanced structural cross-sections. The densities allocated to the different bodies are 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. We include a partial melting zone at midcrustal depths under the Altiplano-Puna (low-velocity zone) and consider the presence of a rheologically strong block beneath the Salar de Atacama basin, according to recent seismic studies. Contour maps of the depth of the continental Moho, the thickness of the lower crust and the depth to the bottom of the lithosphere below South America are produced. The possible percentage of partial melt in the Central Andes low-velocity zone is estimated. The residual anomaly is calculated by subtracting from the Bouguer anomaly the gravimetric effect of the modelled subducted slab and of the modelled Moho. Isostatic anomalies are calculated from regional and local isostatic Mohos calculated with and without internal loads, derived from our gravity model, which are then compared to the modelled continental Moho. This study contributes to a more detailed knowledge of the lithospheric structure of this region of the Andes and provides an integrated 3D density model, which may be used by the geoscientific community as a tool that can help to understand and interpret the geodynamic features and processes acting along the Central Andes. © 2009 Elsevier B.V. All rights reserved. |
| title |
3D density model of the Central Andes |
| title_short |
3D density model of the Central Andes |
| title_full |
3D density model of the Central Andes |
| title_fullStr |
3D density model of the Central Andes |
| title_full_unstemmed |
3D density model of the Central Andes |
| title_sort |
3d density model of the central andes |
| publishDate |
2009 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319201_v177_n3-4_p217_Prezzi http://hdl.handle.net/20.500.12110/paper_00319201_v177_n3-4_p217_Prezzi |
| _version_ |
1768544629091729408 |