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Abstract:

The western retroarc of the Southern Andes between 38° and 40° S is formed by a NNW-elongated ridge not associated with stacked thrust sheets. On the contrary, during the last 4-3 Ma this ridge was affected by extensional deformation, regional uplift and related folding on a very broad scale. Receiver function analysis shows that the drainage divide area and adjacent retroarc lie over an attenuated crust. Expected crustal thickness at these latitudes is around 38 km, whereas in this part of the retroarc the thickness is less than 32 km. The causes for such attenuation have been linked to a moderate steepening of the subducted Nazca plate beneath the South American plate, which is suggested by a westward shift and narrowing of the magmatic arc during the last 4 to 5 Ma. Gravimetric studies show that the upper plate did not react homogeneously to slab steepening, but ancient sutures and lithospheric discontinuities deeply buried under Mesozoic to Cenozoic sequences in the retroarc were locally reactivated. These processes resulted in an asthenospheric anomaly that correlates at the surface with the area of Pliocene to Quaternary doming, widespread extension and three radial troughs. Two of the troughs have accommodated substantial amounts of extension, but the third was probably aborted at an early stage. Moreover, the presence of an anomalous concentration of calderas and large volcanic centers over the proposed asthenospheric anomaly, and their age distribution, may indicate minor migration of the asthenospheric anomaly between 4 and 2 Ma through the western South American plate. © 2007 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Crustal attenuation in the Southern Andean retroarc (38°-39°30′ S) determined from tectonic and gravimetric studies: The Lonco-Luán asthenospheric anomaly
Autor:Folguera, A.; Introcaso, A.; Giménez, M.; Ruiz, F.; Martinez, P.; Tunstall, C.; García Morabito, E.; Ramos, V.A.
Filiación:Laboratorio de Tectónica Andina, Universidad de Buenos Aires, CONICET, Buenos Aires, Argentina
Instituto de Física de Rosario, Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Universidad Nacional de Rosario, Argentina
Instituto Geofísico Sismológico Ing. F. S. Volponi, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Argentina
Idioma: Inglés
Palabras clave:Andean gravity; Asthenospheric anomalies; Retroarc extension; Retroarc volcanism; Thermal uplift; asthenosphere; Cenozoic; crustal structure; crustal thickness; deformation; extensional tectonics; folding; gravimetry; Mesozoic; Nazca plate; slab; tectonic plate; thrust; uplift; South America; Indicator minor
Año:2007
Volumen:439
Número:1-4
Página de inicio:129
Página de fin:147
DOI: http://dx.doi.org/10.1016/j.tecto.2007.04.001
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v439_n1-4_p129_Folguera

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Citas:

---------- APA ----------
Folguera, A., Introcaso, A., Giménez, M., Ruiz, F., Martinez, P., Tunstall, C., García Morabito, E.,..., Ramos, V.A. (2007) . Crustal attenuation in the Southern Andean retroarc (38°-39°30′ S) determined from tectonic and gravimetric studies: The Lonco-Luán asthenospheric anomaly. Tectonophysics, 439(1-4), 129-147.
http://dx.doi.org/10.1016/j.tecto.2007.04.001
---------- CHICAGO ----------
Folguera, A., Introcaso, A., Giménez, M., Ruiz, F., Martinez, P., Tunstall, C., et al. "Crustal attenuation in the Southern Andean retroarc (38°-39°30′ S) determined from tectonic and gravimetric studies: The Lonco-Luán asthenospheric anomaly" . Tectonophysics 439, no. 1-4 (2007) : 129-147.
http://dx.doi.org/10.1016/j.tecto.2007.04.001
---------- MLA ----------
Folguera, A., Introcaso, A., Giménez, M., Ruiz, F., Martinez, P., Tunstall, C., et al. "Crustal attenuation in the Southern Andean retroarc (38°-39°30′ S) determined from tectonic and gravimetric studies: The Lonco-Luán asthenospheric anomaly" . Tectonophysics, vol. 439, no. 1-4, 2007, pp. 129-147.
http://dx.doi.org/10.1016/j.tecto.2007.04.001
---------- VANCOUVER ----------
Folguera, A., Introcaso, A., Giménez, M., Ruiz, F., Martinez, P., Tunstall, C., et al. Crustal attenuation in the Southern Andean retroarc (38°-39°30′ S) determined from tectonic and gravimetric studies: The Lonco-Luán asthenospheric anomaly. Tectonophysics. 2007;439(1-4):129-147.
http://dx.doi.org/10.1016/j.tecto.2007.04.001