Flujo de fluidos durante la deformación compresiva y extensiva en el cabalgamiento de Estamariu (Zona Axial de los Pirineos)

Autor: Muñoz-López, D., Alías, G., Cruset, David, Cantarero, I., Travé, Anna
Přispěvatelé: Ministerio de Economía y Competitividad (España), Generalitat de Catalunya
Rok vydání: 2021
Předmět:
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
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Popis: X Congreso Geológico de España, 5-7 Julio 2021, Vitoria - Gasteiz
Calcite veins precipitated in the Estamariu thrust during two tectonic events have been investigated in order to decipher the relationships between deformation and fluid migration in Paleozoic basement rocks. Structural observations constrain the timing of vein formation and fluid migration, whilst geochemical analyses (¿13C, ¿18O, 87Sr/86Sr and elemental composition) of the related calcite cements indicate the fluid origin, pathways and extent of fluid-rock interaction. The first tectonic event, related to the Alpine reactivation of the Estamariu Variscan thrust, is characterized by the upward migration of fluids derived from the crystalline basement, giving rise to the precipitation of calcite cements Cc1 and Cc2. The second tectonic event, developed during the Neogene extension, was responsible of the reactivation of the Estamariu thrust and the development of normal faults and shear fractures in which calcite cements Cc3, Cc4 and Cc5 precipitated. Cc3 and Cc4 precipitated from meteoric fluids that interacted at depth with basement rocks before upflowing through fault zones and related structures. Cc5 precipitated from meteoric fluids percolating from the surface through small fractures.
This research was funded by the Spanish Projects CGL2015-66335-C2-1-R and PGC2018-093903-B-C22, and by the Grup Consolidat de Recerca “Geologia Sedimentària” (2017-SGR- 824). The PhD research of DM-L is supported by the FPI2016 (BES-2016-077214) Spanish program from MINECO.
Databáze: OpenAIRE
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