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Abstract:

Desertification of Central Patagonia began between ~14–12 Ma and therefore was not directly connected to the opening of the Drake Passage and initial conformation of the Antarctica ice cap in early Miocene times. Local processes, in particular the uplift of the Southern Andes, seem to have played a major role in climatic and biotic changes. We studied synorogenic strata filling a partly cannibalized foredeep between ~45° and 47°S at the latitudes of the Chile triple juction. Older synorogenic successions have yielded 18.7–16.4 Ma (U-Pb) in the western sector of the North Patagonian Cordillera corresponding to Meseta Guadal, Jeinemeni and Alto de Río Cisnes sections. This uplift was partly contemporaneous with broken foreland deformation associated with the San Bernardo fold belt to the east at 17.7–15 Ma. Younger synorogenic successions of 13.5 Ma (U-Pb), associated with a short pulse of major uplift that gave way to deposition of a thick conglomeratic succession, and subsequently finer-grained deposits of 12.3 Ma, are on the eastern Andean front in the Chalía and Guenguell sections, implying a retraction in orogenic activity, and out-of-sequence growth of the Patagonian Cordillera. Consequently, contractional deformation in this area ended after ~12 Ma, sealed by the extrusion of extensive alkali flood basalts, indicating that Neogene shortening only lasted ~6 My, ending around 6 My before the subduction of the Chile Ridge at the latitudes of Central Patagonia and 4.5 My before subduction at the southern tip of South America. © 2018 Elsevier B.V.

Registro:

Documento: Artículo
Título:Constraints on the Neogene growth of the central Patagonian Andes at the latitude of the Chile triple junction (45–47°S) using U/Pb geochronology in synorogenic strata
Autor:Folguera, A.; Encinas, A.; Echaurren, A.; Gianni, G.; Orts, D.; Valencia, V.; Carrasco, G.
Filiación:Instituto de Estudios Andinos, Universidad de Buenos Aires-CONICET, Argentina
Departamento de Ciencias de la Tierra, Facultad de Ciencias Químicas, Universidad de Concepción, Chile
Universidad de San Juan, Instituto Volponi-CONICET, Argentina
Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro – CONICET, Argentina
School of the Environment, Washington State University, Pullman, WA 99164, United States
Servicios Científicos Educativos y Turismo Científico Chile, Pedro León Ugalde 254, Santiago, Chile
Palabras clave:Neogene uplift; Patagonian Andes; Synorogenic strata; U-Pb geochronology; Basalt; Binary alloys; Deformation; Geochronology; Structural geology; Uranium alloys; Central Patagonia; Chile triple junctions; Foreland deformation; Neo genes; Out of sequences; Patagonian Andes; Synorogenic strata; U-Pb geochronology; Lead alloys; deformation; desertification; geochronology; ice cap; Neogene; orogeny; triple junction; uplift; uranium-lead dating; Andes; Chile Ridge; Cordillera; Drake Passage; Pacific Ocean; Paraguay; Patagonia
Año:2018
Volumen:744
Página de inicio:134
Página de fin:154
DOI: http://dx.doi.org/10.1016/j.tecto.2018.06.011
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v744_n_p134_Folguera

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Citas:

---------- APA ----------
Folguera, A., Encinas, A., Echaurren, A., Gianni, G., Orts, D., Valencia, V. & Carrasco, G. (2018) . Constraints on the Neogene growth of the central Patagonian Andes at the latitude of the Chile triple junction (45–47°S) using U/Pb geochronology in synorogenic strata. Tectonophysics, 744, 134-154.
http://dx.doi.org/10.1016/j.tecto.2018.06.011
---------- CHICAGO ----------
Folguera, A., Encinas, A., Echaurren, A., Gianni, G., Orts, D., Valencia, V., et al. "Constraints on the Neogene growth of the central Patagonian Andes at the latitude of the Chile triple junction (45–47°S) using U/Pb geochronology in synorogenic strata" . Tectonophysics 744 (2018) : 134-154.
http://dx.doi.org/10.1016/j.tecto.2018.06.011
---------- MLA ----------
Folguera, A., Encinas, A., Echaurren, A., Gianni, G., Orts, D., Valencia, V., et al. "Constraints on the Neogene growth of the central Patagonian Andes at the latitude of the Chile triple junction (45–47°S) using U/Pb geochronology in synorogenic strata" . Tectonophysics, vol. 744, 2018, pp. 134-154.
http://dx.doi.org/10.1016/j.tecto.2018.06.011
---------- VANCOUVER ----------
Folguera, A., Encinas, A., Echaurren, A., Gianni, G., Orts, D., Valencia, V., et al. Constraints on the Neogene growth of the central Patagonian Andes at the latitude of the Chile triple junction (45–47°S) using U/Pb geochronology in synorogenic strata. Tectonophysics. 2018;744:134-154.
http://dx.doi.org/10.1016/j.tecto.2018.06.011