Early Paleozoic structural and metamorphic evolution of the Transpatagonian Orogen related to Gondwana assembly.

• Autores: González, Pablo Diego; Naipauer, Maximiliano; Sato, Ana María; Varela, Ricardo; Stipp Basei, Miguel Angel; Cábana, María Cecilia; Vlach, Silvio Roberto; Arce, Martín; Parada, Martín Nazareno
• Año de publicación: 2020
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Exactas y Naturales; Fold-and-thrust belt; Low-grade metamorphism; Anti-clockwise P–T-time path; Early Paleozoic; Patagonia; Ciencias Exactas y Naturales
• Institución: Universidad Nacional de Río Negro

Fil: González, Pablo Diego. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: González, Pablo Diego. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Naipauer, Maximiliano. Instituto de Estudios Andinos “Don Pablo Groeber” (UBA-CONICET). Buenos Aires, Argentina.
Fil: Sato, Ana María. Universidad Nacional de La Plata (UNLP), Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas. CONICET. Buenos Aires, Argentina.
Fil: Varela, Ricardo. CONICET - Centro de Investigaciones Geológicas, Universidad Nacional de La Plata; Argentina.
Fil: Stipp Basei, Miguel Angel. Centro de Pesquisas Geocronológicas (CPGeo), Instituto de Geociências, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Universidade de São Paulo. São Paulo. Brasil.
Fil: Cábana, María Cecilia. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Vlach, Silvio Roberto. Centro de Pesquisas Geocronológicas (CPGeo), Instituto de Geociências, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Universidade de São Paulo. São Paulo. Brasil.
Fil: Arce, Martín. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Parada, Martín Nazareno. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
The temporal and spatial relationships between polyphase folding and faulting, regional metamorphism, and granitoids intrusions are discussed for the low-grade basement rocks of the El Jagüelito Formation from the eastern North Patagonian Massif, Argentina, at the inferred western Gondwana margin. As a result of the tectonometamorphic and magmatic events, a late Cambrian-early Ordovician orogenic belt is revealed in northern Patagonia and shall be named the Transpatagonian orogen. It is an NW–SE-trending belt traced from the extra-Andean North Patagonian Cordillera region via the eastern North Patagonian Massif up to the Atlantic coast in the east. The early Paleozoic Transpatagonian orogen is the result of compressional tectonics, also showing a significant dextral shearing, and regional metamorphism leading to the development of a fold-and-thrust belt with an anticlockwise P–T–D-time path. The double-sided orogen is divided into three tectonometamorphic zones bounded by NW–SE trending major faults. Regional comparisons of our results in the present contribution together with available geological data, allow characterizing the orogen as part of a paired metamorphic belt system, with an outboard low-P/high-T belt (northern Patagonia terrane) and a parallel, inboard medium-P/T belt of Barrowian type (Famatinian Orogen on Gondwana margin), respectively. They are juxtaposed tectonically along with the contact of the suture Huincul Fault Zone. The Transpatagonian orogen was implanted along the southernmost Gondwana margin during the final stages of the supercontinent assembly in the early Paleozoic. The tectonism of the Permian Gondwanide orogeny reworked the Transpatagonian orogen.
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