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Artículo

3D density model of the Central Andes

Prezzi, Claudia BeatrizIcon ; Götze, Hans Jürgen; Schmidt, Sabine
Fecha de publicación: 12/2009
Editorial: Elsevier Science
Revista: Physics of the Earth and Planetary Interiors
ISSN: 0031-9201
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Meteorología y Ciencias Atmosféricas

Resumen

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.
Palabras clave: 3d Density Model , Central Andes , Gravity , Lithospheric Structure
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/75381
DOI: http://dx.doi.org/10.1016/j.pepi.2009.09.004
URL: https://www.sciencedirect.com/science/article/pii/S003192010900199X
Colecciones
Articulos(IGEBA)
Articulos de INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BS. AS
Citación
Prezzi, Claudia Beatriz; Götze, Hans Jürgen; Schmidt, Sabine; 3D density model of the Central Andes; Elsevier Science; Physics of the Earth and Planetary Interiors; 177; 3-4; 12-2009; 217-234
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