Lithospheric 3D gravity modelling using upper-mantle density constraints: Towards a characterization of the crustal configuration in the North Patagonian Massif area, Argentina

The North Patagonian Massif is an Argentinean plateau that has an average height of 1200 m and stands from 500 to 700 m above the neighboring areas. During Paleogene, it suffered a sudden uplift of more than 1200 m without noticeable internal deformation; thus, it could be related to isostatic diseq...

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Autores principales: Gómez Dacal, María Laura, Tocho, Claudia Noemí, Aragón, Eugenio, Sippel, Judith, Scheck Wenderoth, Magdalena, Ponce, Alexis Daniel
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2017
Materias:
Geofísica
Geología
3D gravity modelling
Crustal configuration
North Patagonian massif
Seismic tomography
Xenoliths
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/98476
https://ri.conicet.gov.ar/11336/63452
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-98476
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geofísica
Geología
3D gravity modelling
Crustal configuration
North Patagonian massif
Seismic tomography
Xenoliths
spellingShingle Geofísica
Geología
3D gravity modelling
Crustal configuration
North Patagonian massif
Seismic tomography
Xenoliths
Gómez Dacal, María Laura
Tocho, Claudia Noemí
Aragón, Eugenio
Sippel, Judith
Scheck Wenderoth, Magdalena
Ponce, Alexis Daniel
Lithospheric 3D gravity modelling using upper-mantle density constraints: Towards a characterization of the crustal configuration in the North Patagonian Massif area, Argentina
topic_facet Geofísica
Geología
3D gravity modelling
Crustal configuration
North Patagonian massif
Seismic tomography
Xenoliths
description The North Patagonian Massif is an Argentinean plateau that has an average height of 1200 m and stands from 500 to 700 m above the neighboring areas. During Paleogene, it suffered a sudden uplift of more than 1200 m without noticeable internal deformation; thus, it could be related to isostatic disequilibrium. To shed light on the geodynamic development of the area it is necessary to characterize the present-day configuration of the crust. In this study, a lithospheric-scale 3D density model was developed by integrating all the available data of the area with the objective of assessing the depth of the crust–mantle discontinuity (Moho). During the construction of the initial density model, we tested different mantle density scenarios obtained using P- and S-wave velocities from tomographic models, converting them into densities and comparing the conversions with densities obtained from xenoliths. Below the North Patagonian Massif plateau, we have derived a Moho depth between 40 and 50 km which is from 2 to 7 km deeper than its surroundings. There is an evident correlation between high topography and deep Moho that would indicate isostatic equilibrium at present. The model results provide a new approach to the Moho depth in an area where there is no seismic constraining information about this discontinuity. In addition, we found a spatial correlation between the variation of the mean crustal density and the location of the Paleozoic terranes that were proposed to constitute the basement of Argentina.
format Articulo
Preprint
author Gómez Dacal, María Laura
Tocho, Claudia Noemí
Aragón, Eugenio
Sippel, Judith
Scheck Wenderoth, Magdalena
Ponce, Alexis Daniel
author_facet Gómez Dacal, María Laura
Tocho, Claudia Noemí
Aragón, Eugenio
Sippel, Judith
Scheck Wenderoth, Magdalena
Ponce, Alexis Daniel
author_sort Gómez Dacal, María Laura
title Lithospheric 3D gravity modelling using upper-mantle density constraints: Towards a characterization of the crustal configuration in the North Patagonian Massif area, Argentina
title_short Lithospheric 3D gravity modelling using upper-mantle density constraints: Towards a characterization of the crustal configuration in the North Patagonian Massif area, Argentina
title_full Lithospheric 3D gravity modelling using upper-mantle density constraints: Towards a characterization of the crustal configuration in the North Patagonian Massif area, Argentina
title_fullStr Lithospheric 3D gravity modelling using upper-mantle density constraints: Towards a characterization of the crustal configuration in the North Patagonian Massif area, Argentina
title_full_unstemmed Lithospheric 3D gravity modelling using upper-mantle density constraints: Towards a characterization of the crustal configuration in the North Patagonian Massif area, Argentina
title_sort lithospheric 3d gravity modelling using upper-mantle density constraints: towards a characterization of the crustal configuration in the north patagonian massif area, argentina
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/98476
https://ri.conicet.gov.ar/11336/63452
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