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Abstract:

Twenty-five new long-period magnetotelluric sites near 31.5°S were collected in a west-east profile. This profile and the previous one, aligned with and adjacent to the eastern end, have been merged to form a single profile of more than 700. km long, extending from the Precordillera to the Chaco-Pampean Plain. The geotectonic scenario is characterized by a modern flat subduction zone of the Nazca plate located at a depth of around 120. km and clearly defined by the distribution of earthquake hypocenters recorded by local and regional networks. A "bulge" shape at 68.5°W, with an anomalous dip to the west, is observed within this segment. The smooth slab deformation might result from the restriction on eastward motion due to the presence of an electrically resistive zone. The magnetotelluric model shows that this thick zone of increased resistivity is found from shallow crustal levels to upper mantle depths. The bulge geometry allows hot fluids and volatiles to rise from the deeper asthenospheric wedge, and reach the lower crust reducing its viscosity and letting it flow. The zones of low resistivity in the lower crust show spatial correlation with the areas of foreland deformation from Precordillera to the Sierras Pampeanas and may also suggest a ductile regime. Shear zones reactivated by Cenozoic faulting must necessarily have their roots in the levels of the ductile lower crust associated to conductive channels. The zone where the lower crust is closer to the surface coincides with the areas of greatest structural relief and erosion. The interface between the folded ductile lower crust and the brittle upper crust might act as the main level of décollement of the bordering structures between the Precordillera, Sierra de Pie de Palo and the Sierras Pampeanas. In addition, the geometry of the interface might be conditioning the vergence of those structures. © 2012 Elsevier B.V.

Registro:

Documento: Artículo
Título:Crustal deformation of the Andean foreland at 31° 30'S (Argentina) constrained by magnetotelluric survey
Autor:Orozco, L.A.; Favetto, A.; Pomposiello, C.; Rossello, E.; Booker, J.
Filiación:CONICET, INGEIS, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
CONICET, FCEN - Dpto. Ciencias Geológicas, Universidad de Buenos Aires, C1428EHA - Buenos Aires, Argentina
Department of Earth and Space Sciences, University of Washington, Box 351310, Seattle, WA 98195, United States
Palabras clave:Flat slab; Magnetotellurics; Sierras Pampeanas; Terranes; Anomalous dip; Argentina; Cenozoic; Conductive channels; Crustal deformations; Crustal levels; Ductile regime; Flat slabs; Foreland deformation; Hot fluids; Low resistivity; Lower crust; Magnetotelluric surveys; Nazca plate; Regional networks; Resistive zones; Shear zone; Sierras Pampeanas; Slab deformation; Spatial correlations; Subduction zones; Terranes; Upper crust; Upper mantle; Vergences; Deformation; Earthquakes; Magnetotellurics; Structural geology; Tectonics; asthenosphere; crustal structure; decollement; deformation; earthquake hypocenter; lower crust; magnetotelluric method; Nazca plate; shear zone; slab; subduction zone; terrane; upper crust; Andes; Argentina; Precordillera; San Juan [Argentina]; Sierra de Pie de Palo; Sierras Pampeanas
Año:2013
Volumen:582
Página de inicio:126
Página de fin:139
DOI: http://dx.doi.org/10.1016/j.tecto.2012.09.030
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v582_n_p126_Orozco

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Citas:

---------- APA ----------
Orozco, L.A., Favetto, A., Pomposiello, C., Rossello, E. & Booker, J. (2013) . Crustal deformation of the Andean foreland at 31° 30'S (Argentina) constrained by magnetotelluric survey. Tectonophysics, 582, 126-139.
http://dx.doi.org/10.1016/j.tecto.2012.09.030
---------- CHICAGO ----------
Orozco, L.A., Favetto, A., Pomposiello, C., Rossello, E., Booker, J. "Crustal deformation of the Andean foreland at 31° 30'S (Argentina) constrained by magnetotelluric survey" . Tectonophysics 582 (2013) : 126-139.
http://dx.doi.org/10.1016/j.tecto.2012.09.030
---------- MLA ----------
Orozco, L.A., Favetto, A., Pomposiello, C., Rossello, E., Booker, J. "Crustal deformation of the Andean foreland at 31° 30'S (Argentina) constrained by magnetotelluric survey" . Tectonophysics, vol. 582, 2013, pp. 126-139.
http://dx.doi.org/10.1016/j.tecto.2012.09.030
---------- VANCOUVER ----------
Orozco, L.A., Favetto, A., Pomposiello, C., Rossello, E., Booker, J. Crustal deformation of the Andean foreland at 31° 30'S (Argentina) constrained by magnetotelluric survey. Tectonophysics. 2013;582:126-139.
http://dx.doi.org/10.1016/j.tecto.2012.09.030