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Abstract:

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.

Registro:

Documento: Artículo
Título:Lithospheric structure of the Central Andes based on a 3D gravimetric model
Autor:Prezzi, C.B.; Götze, H.-J.
Filiación:CONICET, Universidad de Buenos Aires, INGEODAV, Dpto. de Ciencias. Geológicas, FCEyN, Universidad de Buenos Aires, Buenos Aires, Argentina
Institut für Geowissenschaften, Abteilung Geophysik, Christian Albrechts Universität, Kiel, Germany
Palabras clave: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
Año:2009
Volumen:65
Número:1
Página de inicio:81
Página de fin:96
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v65_n1_p81_Prezzi

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Citas:

---------- APA ----------
Prezzi, C.B. & Götze, H.-J. (2009) . Lithospheric structure of the Central Andes based on a 3D gravimetric model . Revista de la Asociacion Geologica Argentina, 65(1), 81-96.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v65_n1_p81_Prezzi [ ]
---------- CHICAGO ----------
Prezzi, C.B., Götze, H.-J. "Lithospheric structure of the Central Andes based on a 3D gravimetric model " . Revista de la Asociacion Geologica Argentina 65, no. 1 (2009) : 81-96.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v65_n1_p81_Prezzi [ ]
---------- MLA ----------
Prezzi, C.B., Götze, H.-J. "Lithospheric structure of the Central Andes based on a 3D gravimetric model " . Revista de la Asociacion Geologica Argentina, vol. 65, no. 1, 2009, pp. 81-96.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v65_n1_p81_Prezzi [ ]
---------- VANCOUVER ----------
Prezzi, C.B., Götze, H.-J. Lithospheric structure of the Central Andes based on a 3D gravimetric model . Rev. Asoc. Geol. Argent. 2009;65(1):81-96.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v65_n1_p81_Prezzi [ ]