The Rinconada phase: A regional tectono-metamorphic event of Silurian age in the pre-Andean basement of Argentina

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Casquet, César and Ramacciotti, Carlos and Larrovere, Mariano Alexis and Verdecchia, Sebastián and Murra, Juan Alberto and Baldo, Edgardo G. and Pankhurst, R.J. and Rapela, Carlos W. (2021) The Rinconada phase: A regional tectono-metamorphic event of Silurian age in the pre-Andean basement of Argentina. Journal of South American earth sciences, 111 (103432). ISSN 0895-9811

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Official URL: https://www.sciencedirect.com/science/article/pii/S0895981121002790?via%3Dihub



Abstract

A Silurian regional tectonometamorphic event has been widely recorded by different geochronological methods in the Sierras Pampeanas, NW Argentina and the Precordillera. It took place between ca. 445 and 420 Ma after the regional Hirnantian (late Ordovician) glaciogenic sedimentation. Three domains are recognized. 1) The eastern Sierras Pampeanas and the Puna mainly record focused westward ductile thrusting and heating. 2) In the westernmost Sierras Pampeanas (Maz, Espinal, and Umango) garnet-amphibolite facies metamorphism, penetrative foliation development and westward ductile thrusting (nappes) took place. 3) In the Precordillera, the Rinconada formation of Silurian age consisting of chaotic olistoliths of Ordovician and Cambrian age correlates with this event. The three domains correspond to the hinterland, the internal hot and thickened metamorphic core, and the foreland respectively of an orogenic belt. Remarkably no Cordilleran-type magmatism of this age has been recorded. The regional importance of this event was overlooked so far.


Item Type:Article
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CRUE-CSIC (Acuerdos Transformativos 2021)

Uncontrolled Keywords:The Rinconada tectonic phase, Famatinian orogeny, Geochronology, Argentina
Subjects:Sciences > Geology > Geodynamics
Sciences > Geology > Petrology
ID Code:68538
Deposited On:04 Nov 2021 12:27
Last Modified:18 Feb 2022 08:55

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