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Abstract:

The origin, extent, and timing of intraplate contraction in Patagonia are among the least understood geological processes of southern South America. Particularly, the intraplate Deseado fold-thrust belt (FTB), located in the Patagonian broken foreland (47°–48°30′S), is one of the most enigmatic areas. In this belt, time constraints on tectonic events are limited and synorogenic deposits have not been documented so far. Furthermore, the driving mechanism for intraplate contraction remains unknown. In this study, we carried out a structural and sedimentological analysis. We report the first syntectonic deposits in this area in the Baqueró (Aptian) and Chubut (Cenomanian/Campanian) groups and a newly found unit referred to as the Albian beds (109.9 ± 1.5 Ma). Thus, several contractional stages in late Aptian, Albian, and Cenomanian-Campanian are then inferred. We suggest that the Deseado FTB constituted the southernmost expression of the early Patagonian broken foreland in Cretaceous times. Additionally, we analyzed the spatiotemporal magmatic arc behavior as a proxy of dynamic changes in the Andean subduction during determined stages of intraplate contraction. We observe a significant arc broadening from ~121 to 82 Myr and magmatic quiescence after ~67 Ma. This is interpreted as a slab shallowing to flattening process. Far-field tectonic forces would have been produced by increased plate coupling linked to the slab flattening as indirectly indicated by the correlation between Cretaceous arc expansion and intraplate contraction. Finally, the tectonic evolution of the Deseado FTB favors studies supporting inception of Andean shortening since Cretaceous times. ©2018. American Geophysical Union. All Rights Reserved.

Registro:

Documento: Artículo
Título:Cretaceous Intraplate Contraction in Southern Patagonia: A Far-Field Response to Changing Subduction Dynamics?
Autor:Gianni, G.M.; Navarrete, C.; Liendo, I.; Díaz, M.; Giménez, M.E.; Encinas, A.; Folguera, A.
Filiación:Instituto Geofísico Sismológico Ing. Volponi, Universidad Nacional de San Juan, San Juan, Argentina
Departamento de Geología, Universidad Nacional de la Patagonia San Juan Bosco, Comodoro Rivadavia, Argentina
Departamento de Geología, Universidad Nacional de San Juan, San Juan, Argentina
Departamento de Ciencias de la Tierra, Universidad de Concepción, Concepción, Chile
IDEAN, Instituto de Estudios Andinos Don Pablo Groeber, UBA - CONICET. Departamento de Ciencias Geológicas, FCEN, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:arc migration; broken foreland; growth strata; intraplate contraction; Patagonian Andes; synorogenic deposits; Deposits; arc migration; broken foreland; Growth strata; Magmatic quiescence; Patagonian Andes; Sedimentological analysis; Southern south america; Subduction dynamics; Tectonics; Cretaceous; fold and thrust belt; foreland basin; intraplate process; subduction; Andes; Patagonia
Año:2018
Volumen:37
Número:9
Página de inicio:2915
Página de fin:2937
DOI: http://dx.doi.org/10.1029/2018TC005173
Título revista:Tectonics
Título revista abreviado:Tectonics
ISSN:02787407
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02787407_v37_n9_p2915_Gianni

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Citas:

---------- APA ----------
Gianni, G.M., Navarrete, C., Liendo, I., Díaz, M., Giménez, M.E., Encinas, A. & Folguera, A. (2018) . Cretaceous Intraplate Contraction in Southern Patagonia: A Far-Field Response to Changing Subduction Dynamics?. Tectonics, 37(9), 2915-2937.
http://dx.doi.org/10.1029/2018TC005173
---------- CHICAGO ----------
Gianni, G.M., Navarrete, C., Liendo, I., Díaz, M., Giménez, M.E., Encinas, A., et al. "Cretaceous Intraplate Contraction in Southern Patagonia: A Far-Field Response to Changing Subduction Dynamics?" . Tectonics 37, no. 9 (2018) : 2915-2937.
http://dx.doi.org/10.1029/2018TC005173
---------- MLA ----------
Gianni, G.M., Navarrete, C., Liendo, I., Díaz, M., Giménez, M.E., Encinas, A., et al. "Cretaceous Intraplate Contraction in Southern Patagonia: A Far-Field Response to Changing Subduction Dynamics?" . Tectonics, vol. 37, no. 9, 2018, pp. 2915-2937.
http://dx.doi.org/10.1029/2018TC005173
---------- VANCOUVER ----------
Gianni, G.M., Navarrete, C., Liendo, I., Díaz, M., Giménez, M.E., Encinas, A., et al. Cretaceous Intraplate Contraction in Southern Patagonia: A Far-Field Response to Changing Subduction Dynamics?. Tectonics. 2018;37(9):2915-2937.
http://dx.doi.org/10.1029/2018TC005173