Artículo

Encinas, A.; Folguera, A.; Riffo, R.; Molina, P.; Fernández Paz, L.; Litvak, V.D.; Colwyn, D.A.; Valencia, V.A.; Carrasco, M. "Cenozoic basin evolution of the Central Patagonian Andes: Evidence from geochronology, stratigraphy, and geochemistry" (2018) Geoscience Frontiers
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Abstract:

The Central Patagonian Andes is a particular segment of the Andean Cordillera that has been subjected to the subduction of two spreading ridges during Eocene and Neogene times. In order to understand the Cenozoic geologic evolution of the Central Patagonian Andes, we carried out geochronologic (U-Pb and 40 Ar/ 39 Ar), provenance, stratigraphic, sedimentologic, and geochemical studies on the sedimentary and volcanic Cenozoic deposits that crop out in the Meseta Guadal and Chile Chico areas (∼47°S). Our data indicate the presence of a nearly complete Cenozoic record, which refutes previous interpretations of a hiatus during the middle Eocene–late Oligocene in the Central Patagonian Andes. Our study suggests that the fluvial strata of the Ligorio Márquez Formation and the flood basalts of the Basaltos Inferiores de la Meseta Chile Chico Formation were deposited in an extensional setting related to the subduction of the Aluk-Farallon spreading ridge during the late Paleocene–Eocene. Geochemical data on volcanic rocks interbedded with fluvial strata of the San José Formation suggest that this unit was deposited in an extensional setting during the middle Eocene to late Oligocene. Progressive crustal thinning allowed the transgression of marine waters of Atlantic origin and deposition of the upper Oligocene–lower Miocene Guadal Formation. The fluvial synorogenic strata of the Santa Cruz Formation were deposited as a consequence of an important phase of compressive deformation and Andean uplift during the early–middle Miocene. Finally, alkali flood basalts of the late middle to late Miocene Basaltos Superiores de la Meseta Chile Chico Formation were extruded in the area in response to the suduction of the Chile Ridge under an extensional regime. Our studies indicate that the tectonic evolution of the Central Patagonian Andes is similar to that of the North Patagonian Andes and appears to differ from that of the Southern Patagonian Andes, which is thought to have been the subject of continuous compressive deformation since the late Early Cretaceous. © 2018 China University of Geosciences (Beijing) and Peking University

Registro:

Documento: Artículo
Título:Cenozoic basin evolution of the Central Patagonian Andes: Evidence from geochronology, stratigraphy, and geochemistry
Autor:Encinas, A.; Folguera, A.; Riffo, R.; Molina, P.; Fernández Paz, L.; Litvak, V.D.; Colwyn, D.A.; Valencia, V.A.; Carrasco, M.
Filiación:Departamento de Ciencias de la Tierra, Facultad de Ciencias Químicas, Universidad de Concepción, Víctor Lamas 1290, Concepción, 4030000, Chile
Instituto de Estudios Andinos, Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Ciencias Geológicas, Buenos Aires, Argentina
CONICET-Universidad de Buenos Aires, Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), Buenos Aires, Argentina
Department of Geology & Geophysics, Yale University, 210 Whitney Ave., New Haven, CT 06511, United States
School of the Environment, Washington State University, Pullman, WA 99164, United States
Palabras clave:Ar-Ar geochronology; Central Patagonian Andes; Geochemistry; Sedimentology; Stratigraphy; U-Pb geochronology
Año:2018
DOI: http://dx.doi.org/10.1016/j.gsf.2018.07.004
Título revista:Geoscience Frontiers
Título revista abreviado:Geosci. Front.
ISSN:16749871
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16749871_v_n_p_Encinas

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Citas:

---------- APA ----------
Encinas, A., Folguera, A., Riffo, R., Molina, P., Fernández Paz, L., Litvak, V.D., Colwyn, D.A.,..., Carrasco, M. (2018) . Cenozoic basin evolution of the Central Patagonian Andes: Evidence from geochronology, stratigraphy, and geochemistry. Geoscience Frontiers.
http://dx.doi.org/10.1016/j.gsf.2018.07.004
---------- CHICAGO ----------
Encinas, A., Folguera, A., Riffo, R., Molina, P., Fernández Paz, L., Litvak, V.D., et al. "Cenozoic basin evolution of the Central Patagonian Andes: Evidence from geochronology, stratigraphy, and geochemistry" . Geoscience Frontiers (2018).
http://dx.doi.org/10.1016/j.gsf.2018.07.004
---------- MLA ----------
Encinas, A., Folguera, A., Riffo, R., Molina, P., Fernández Paz, L., Litvak, V.D., et al. "Cenozoic basin evolution of the Central Patagonian Andes: Evidence from geochronology, stratigraphy, and geochemistry" . Geoscience Frontiers, 2018.
http://dx.doi.org/10.1016/j.gsf.2018.07.004
---------- VANCOUVER ----------
Encinas, A., Folguera, A., Riffo, R., Molina, P., Fernández Paz, L., Litvak, V.D., et al. Cenozoic basin evolution of the Central Patagonian Andes: Evidence from geochronology, stratigraphy, and geochemistry. Geosci. Front. 2018.
http://dx.doi.org/10.1016/j.gsf.2018.07.004