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Título: U-Pb geochronology of the meta-volcanic rocks from Sierra de Calcatapul: implications for the Middle Triassic syn-rift volcanism and tectonic evolution of Northern extra-Andean Patagonia.
Autor(es): González, Pablo Diego
Giacosa, Raúl Eduardo
Lagorio, Silvia
Ballivian Justiniano, Carlos
Sato, Ana María
Cábana, María Cecilia
Basei, Miguel Angel Stip
Busteros, Alicia
Silva Nieto, Diego
Fecha de publicación: 1-jun-2021
Editorial: Elsevier
Citación: González, P.D., Giacosa, R., Lagorio, S., Ballivian Justiniano, C., Sato, A.M., Cábana, M.C., Basei, M., Busteros, A., Silva Nieto, D. (2021). U-Pb geochronology of the meta-volcanic rocks from Sierra de Calcatapul: implications for the Middle Triassic syn-rift volcanism and tectonic evolution of Northern extra-Andean Patagonia. Journal of South American Earth Sciences; 108; 103170.
Revista: Journal of South American Earth Sciences
Abstract: This contribution deals first new ICP-MS U–Pb zircon ages that indicate Middle- and Late Triassic magmatic episode and tectonometamorphic events, respectively, for the central Patagonia region, instead of a Paleozoic history as previously estimated. The Calcatapul Formation consists of a (meta-) volcano-sedimentary syn-rift sequence deposited unconformably, shortly after the extensional Gondwanide orogenic collapse, over a basement composed of Permian granites. Two 206Pb/238U ages yielded 245.1 ±2.8 and 244.8 ±4.1 Ma to magmatic crystallization of ignimbrites, along with another weighted mean of 226.7 ±4.4 Ma interpreted as the age of the tectonometamorphic event D1-M1 affecting the Calcatapul sequence. U–Pb ages open new insights into the tectonomagmatic evolution of the area because the syn-rift wedge deposited in the Uribe and Yancamil half- grabens under the extensional tectonic regime was then inverted along the basin-bounding faults like the Yancamil fault. Inversion tectonics involved reverse fault-related uplift against a buttress of the rigid granitic block, and under dynamic greenschist-to-amphibolite facies metamorphic conditions, before the Late-Triassic granitic magmatism of the Lipetr´en Suite took place. The pre-rift granitic basement represents the southern extension of the main magmatic phase of Choiyoi Province in Patagonia, whereas the Middle Triassic recorded the extensional, post-Choiyoi magmatism. The local, compressive D1 event punctuated an overall widespread lithospheric extension that leads to Gondwana breakup since the earliest Jurassic times.
Resumen: -
URI: http://rid.unrn.edu.ar/handle/20.500.12049/8254
Identificador DOI: https://doi.org/10.1016/j.jsames.2021.103170
ISSN: 0895-9811
Otros enlaces: https://www.sciencedirect.com/science/article/pii/S0895981121000171?via%3Dihub
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