Cretaceous Intraplate Contraction in Southern Patagonia: A Far-Field Response to Changing Subduction Dynamics?

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 area...

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Autor principal: Gianni, G.M
Otros Autores: Navarrete, C., Liendo, I., Díaz, M., Giménez, M.E, Encinas, A., Folguera, A.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: Blackwell Publishing Ltd 2018
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100 1 |a Gianni, G.M. 
245 1 0 |a Cretaceous Intraplate Contraction in Southern Patagonia: A Far-Field Response to Changing Subduction Dynamics? 
260 |b Blackwell Publishing Ltd  |c 2018 
270 1 0 |m Gianni, G.M.; Instituto Geofísico Sismológico Ing. Volponi, Universidad Nacional de San JuanArgentina; email: guidogianni22@gmail.com 
506 |2 openaire  |e Política editorial 
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520 3 |a 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.  |l eng 
536 |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas 
536 |a Detalles de la financiación: The authors want to recognize the support received by CONICET and the fruitful discussions with Miguel Ramos and Andrés Echaurren from the Laboratorio de Tectónica Andina. The geochronological data used are listed in the references text and Supporting Information S1. Comments by Etienne Jaillard and two anonymous reviewers helped to improve this manuscript. We are thankful to the Editor Laurent Jolivet for an effective handling of the manuscript. 
593 |a Instituto Geofísico Sismológico Ing. Volponi, Universidad Nacional de San Juan, San Juan, Argentina 
593 |a Departamento de Geología, Universidad Nacional de la Patagonia San Juan Bosco, Comodoro Rivadavia, Argentina 
593 |a Departamento de Geología, Universidad Nacional de San Juan, San Juan, Argentina 
593 |a Departamento de Ciencias de la Tierra, Universidad de Concepción, Concepción, Chile 
593 |a IDEAN, Instituto de Estudios Andinos Don Pablo Groeber, UBA - CONICET. Departamento de Ciencias Geológicas, FCEN, Universidad de Buenos Aires, Buenos Aires, Argentina 
690 1 0 |a ARC MIGRATION 
690 1 0 |a BROKEN FORELAND 
690 1 0 |a GROWTH STRATA 
690 1 0 |a INTRAPLATE CONTRACTION 
690 1 0 |a PATAGONIAN ANDES 
690 1 0 |a SYNOROGENIC DEPOSITS 
690 1 0 |a DEPOSITS 
690 1 0 |a ARC MIGRATION 
690 1 0 |a BROKEN FORELAND 
690 1 0 |a GROWTH STRATA 
690 1 0 |a MAGMATIC QUIESCENCE 
690 1 0 |a PATAGONIAN ANDES 
690 1 0 |a SEDIMENTOLOGICAL ANALYSIS 
690 1 0 |a SUBDUCTION DYNAMICS 
690 1 0 |a TECTONICS 
690 1 0 |a CRETACEOUS 
690 1 0 |a FOLD AND THRUST BELT 
690 1 0 |a FORELAND BASIN 
690 1 0 |a INTRAPLATE PROCESS 
690 1 0 |a SUBDUCTION 
690 1 0 |a ANDES 
690 1 0 |a PATAGONIA 
651 4 |a SOUTHERN SOUTH AMERICA 
700 1 |a Navarrete, C. 
700 1 |a Liendo, I. 
700 1 |a Díaz, M. 
700 1 |a Giménez, M.E. 
700 1 |a Encinas, A. 
700 1 |a Folguera, A. 
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