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Abstract:

Elastic properties in twelve representative rock samples from Central and Western Precordillera in the Andean backarc region of Argentina between 30 and 31°S were estimated from detailed petrological analysis. Thus, P and S seismic-wave velocities (Vp, Vs) as well as Poisson's ratio (σ) among other parameters were derived for gabbros, leuco-gabbros and wehrlites, in greenschist and amphibolite metamorphic conditions using a framework of a wide variety of empirical observations from active continental margins. In addition, Vs lithosphere models along two west-east cross sections were obtained using a joint inversion of teleseismic Rayleigh waves and receiver functions. These models clearly delineate the upper-plate crustal structure and the flat-slab subduction of the Nazca plate at about 100 km depth in this region. The suggested seismic velocity structure shows a relatively low (<3.3 km/s) Vs layer located in the first 15-18 km depth, then an increase of it from 3.3 to 4 km/s between 20 and 55 km depth with a mayor change at 40 km depth beneath the Precordillera showing an increase in Vs from 3.3 to 3.8 km/s. The Moho discontinuity was identified at around 65 km depth beneath the Precordillera (Vs = 4.3 km/s) and shows a low shear-wave velocity contrast in comparison with the upper continental mantle's parameters. Using this seismological model, Vs estimations derived from the petrological analyses for the 12 collected samples can be projected at depths greater than 30 km. These geophysical and petrological results agree with the hypothesis of a mafic thickened and partially eclogitized lower crust beneath the Precordillera, which has been predicted previously on a base of seismological studies only. Our petrological and seismological results collectively support a thick crustal model of a mafic-ultramafic composition extending to middle-to-lower crustal levels beneath Central and Western Precordillera; this region correlates with a suture zone between the eastern Cuyania terrane and the western Chilenia terrane. © 2015 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Constraining a mafic thick crust model in the Andean Precordillera of the Pampean flat slab subduction region
Autor:Pérez Luján, S.B.; Ammirati, J.-B.; Alvarado, P.; Vujovich, G.I.
Filiación:Centro de Investigaciones de la Geósfera y Biósfera (CIGEOBIO), Consejo Nacional de Investigaciones Cientificas y Tecnicas CONICET, Dpto. de Geofisica y Astronomia, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, San Juan, Meglioli 1160 Sur, Rivadavia, San Juan, 5406, Argentina
Agencia Nacional de Promoción Científica y Tecnológica (FONCyT), Argentina
Instituto de Estudios Andinos Don Pablo Groeber (UBA-CONICET), Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:Continental crust; Flat slab subduction; Mafic-ultramafic lithology; Seismic velocities; Western Andean Precordillera; crustal thickness; elastic property; lithology; mafic rock; modeling; Moho; Nazca plate; P-wave; petrology; rock property; S-wave; seismic velocity; slab; subduction; suture zone; terrane; ultramafic rock; wave velocity; Argentina; Precordillera
Año:2015
Volumen:64
Página de inicio:325
Página de fin:338
DOI: http://dx.doi.org/10.1016/j.jsames.2015.09.005
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v64_n_p325_PerezLujan

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Citas:

---------- APA ----------
Pérez Luján, S.B., Ammirati, J.-B., Alvarado, P. & Vujovich, G.I. (2015) . Constraining a mafic thick crust model in the Andean Precordillera of the Pampean flat slab subduction region. Journal of South American Earth Sciences, 64, 325-338.
http://dx.doi.org/10.1016/j.jsames.2015.09.005
---------- CHICAGO ----------
Pérez Luján, S.B., Ammirati, J.-B., Alvarado, P., Vujovich, G.I. "Constraining a mafic thick crust model in the Andean Precordillera of the Pampean flat slab subduction region" . Journal of South American Earth Sciences 64 (2015) : 325-338.
http://dx.doi.org/10.1016/j.jsames.2015.09.005
---------- MLA ----------
Pérez Luján, S.B., Ammirati, J.-B., Alvarado, P., Vujovich, G.I. "Constraining a mafic thick crust model in the Andean Precordillera of the Pampean flat slab subduction region" . Journal of South American Earth Sciences, vol. 64, 2015, pp. 325-338.
http://dx.doi.org/10.1016/j.jsames.2015.09.005
---------- VANCOUVER ----------
Pérez Luján, S.B., Ammirati, J.-B., Alvarado, P., Vujovich, G.I. Constraining a mafic thick crust model in the Andean Precordillera of the Pampean flat slab subduction region. J. South Am. Earth Sci. 2015;64:325-338.
http://dx.doi.org/10.1016/j.jsames.2015.09.005