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dc.contributor.author
Perez Lujan, Sofia Beatriz
dc.contributor.author
Ammirati, Jean Baptiste
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Alvarado, Patricia Monica
dc.contributor.author
Vujovich, Graciela Irene
dc.date.available
2016-03-23T14:58:08Z
dc.date.issued
2015-09-09
dc.identifier.citation
Perez Lujan, Sofia Beatriz; Ammirati, Jean Baptiste; Alvarado, Patricia Monica; Vujovich, Graciela Irene; Constraining a mafic thick crust model in the Andean Precordillera of the Pampean flat slab subduction region; Elsevier; Journal of South American Earth Sciences; 64; 2; 9-9-2015; 325-338
dc.identifier.issn
0895-9811
dc.identifier.uri
http://hdl.handle.net/11336/4913
dc.description.abstract
Elastic properties in twelve representative rock samples from Central and Western Precordillera in the Andean backarc region of Argentina between 30 and 31S were estimated from detailed petrological analysis. Thus, P and S seismic-wave velocities (Vp, Vs) as well as Poisson´s ratio (s) among other parameterswere 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 westeeast cross sections were obtainedusing 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) Vslayer located in the first 15e18 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 ¼ 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 andpetrological 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 eultramafic 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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Seismic Velocities
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Continental Crust
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Mafic-Ultramafic Lithology
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Geoquímica y Geofísica
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Constraining a mafic thick crust model in the Andean Precordillera of the Pampean flat slab subduction region
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
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info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-03-30 10:35:44.97925-03
dc.journal.volume
64
dc.journal.number
2
dc.journal.pagination
325-338
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Perez Lujan, Sofia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Juan. Centro de Investigaciones de la Geosfera y Biosfera; Argentina
dc.description.fil
Fil: Ammirati, Jean Baptiste. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Juan. Centro de Investigaciones de la Geosfera y Biosfera; Argentina. Ministerio de Ciencia, Tecnologí­a e Innovación Productiva. Agencia Nacional de Promoción Cientí­fica y Tecnológica. Fondo para la Investigación Cientí­fica y Tecnológica; Argentina
dc.description.fil
Fil: Alvarado, Patricia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Juan. Centro de Investigaciones de la Geosfera y Biosfera; Argentina
dc.description.fil
Fil: Vujovich, Graciela Irene. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geologicas. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
dc.journal.title
Journal of South American Earth Sciences
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0895981115300572
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info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2015.09.005
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info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2015.09.005