Por favor, use este identificador para citar o enlazar este ítem:
http://rid.unrn.edu.ar/handle/20.500.12049/8254
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 |
Aparece en las colecciones: | Artículos |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
---|---|---|---|---|
Calcatapul_JSAES-2021.pdf | 9,71 MB | Adobe PDF | Visualizar/Abrir |
Este documento es resultado del financiamiento otorgado por el Estado Nacional, por lo tanto queda sujeto al cumplimiento de la Ley N° 26.899
Este ítem está sujeto a una licencia Creative Commons Licencia Creative Commons