Artículo

Orts, D.L.; Folguera, A.; Giménez, M.; Ruiz, F.; Rojas Vera, E.A.; Lince Klinger, F. "Cenozoic building and deformational processes in the North Patagonian Andes" (2015) Journal of Geodynamics. 86:26-41
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Abstract:

The Oligocene to present evolution of the North Patagonian Andes is analyzed linking geological and geophysical data in order to decipher the deformational processes that acted through time and relate them to basin formation processes. Seismic reflection profiles reveal the shallow structure of the retroarc area where contractional structures, associated with Oligocene to early Miocene inverted extensional depocenters, are partially onlapped by early to late Miocene synorogenic deposits. From the construction of five structural cross sections along the retroarc area between 40° and 43°30'. S, constrained by surface, gravity and seismic data, a shortening gradient is observed along Andean strike. The highest shortening of 18.7. km (15.34%) is determined near 41°30'. S coincidentally with maximum mean topographic values on the eastern Andean slope, where basement blocks were uplifted in the orogenic front area, and the deepest and broadest synorogenic depocenters were formed towards the foreland. Additionally, eastward shifting of Miocene calc-alkaline rocks occurred at these latitudes, which is interpreted as indicative of a change in the subduction parameters at this time. Deep crustal retroarc structure is evaluated through inversion of gravity models that made possible to infer Moho attenuated zones. These coincide with the occurrence of younger than 5. Ma within-plate volcanics as well as with crustal thermal anomalies suggested by shallowing of the Curie isotherm calculated from magnetic data. Younger volcanism and thermal anomalies are explained by slab steepening since early Pliocene, after a mild-shallow subduction setting in the middle to late Miocene, age of the main compressive event. © 2015 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Cenozoic building and deformational processes in the North Patagonian Andes
Autor:Orts, D.L.; Folguera, A.; Giménez, M.; Ruiz, F.; Rojas Vera, E.A.; Lince Klinger, F.
Filiación:Instituto de Estudios Andinos Don Pablo Groeber, Departamento de Ciencias Geológicas, FCEyN, Universidad de Buenos Aires - CONICET, Ciudad Universitaria - Pabellón II, Buenos Aires, Argentina
Instituto Geofísico y Sismológico Ing, Volponi, Universidad Nacional de San Juan, CONICET, Ruta 12-Km17, San Juan, Argentina
Palabras clave:Andean orogenesis; Arc migration; Foreland basin; Gravity and magnetic data; Patagonian Andes; Shallow subduction; Shortening; Andean orogeny; Cenozoic; deformation; depocenter; foreland basin; gravity field; magnetic field; slab; subduction zone; temperature anomaly; volcanism; Andes; Patagonia
Año:2015
Volumen:86
Página de inicio:26
Página de fin:41
DOI: http://dx.doi.org/10.1016/j.jog.2015.02.002
Título revista:Journal of Geodynamics
Título revista abreviado:J. Geodyn.
ISSN:02643707
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02643707_v86_n_p26_Orts

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Citas:

---------- APA ----------
Orts, D.L., Folguera, A., Giménez, M., Ruiz, F., Rojas Vera, E.A. & Lince Klinger, F. (2015) . Cenozoic building and deformational processes in the North Patagonian Andes. Journal of Geodynamics, 86, 26-41.
http://dx.doi.org/10.1016/j.jog.2015.02.002
---------- CHICAGO ----------
Orts, D.L., Folguera, A., Giménez, M., Ruiz, F., Rojas Vera, E.A., Lince Klinger, F. "Cenozoic building and deformational processes in the North Patagonian Andes" . Journal of Geodynamics 86 (2015) : 26-41.
http://dx.doi.org/10.1016/j.jog.2015.02.002
---------- MLA ----------
Orts, D.L., Folguera, A., Giménez, M., Ruiz, F., Rojas Vera, E.A., Lince Klinger, F. "Cenozoic building and deformational processes in the North Patagonian Andes" . Journal of Geodynamics, vol. 86, 2015, pp. 26-41.
http://dx.doi.org/10.1016/j.jog.2015.02.002
---------- VANCOUVER ----------
Orts, D.L., Folguera, A., Giménez, M., Ruiz, F., Rojas Vera, E.A., Lince Klinger, F. Cenozoic building and deformational processes in the North Patagonian Andes. J. Geodyn. 2015;86:26-41.
http://dx.doi.org/10.1016/j.jog.2015.02.002