Epidote U-Pb geochronology and H isotope geochemistry trace pre-orogenic hydration of midcrustal granitoids
نویسندگان
چکیده
Abstract Hydrothermal veins and altered feldspar are evidence for fluid circulation in granitic rocks the continental crust. The hydrothermal alteration of affects deformation behavior granitoids, especially if it occurs before orogeny. Geochronology can establish timing to determine this fluid-driven plays a role crustal deformation. Although existing dating techniques cannot be applied directly, absolute ages obtained from veins. We combined U-Pb geochronology hydrogen isotope data (δD) epidote [Ca2Al2(Al,Fe3+) Si3O12(OH)] unravel hydration post-Variscan granitoids Alpine orogen. recent protocol proves first time that fluids meteoric origin infiltrated Permian times by exploiting synrift faults, consistent with δD values epidote-forming fluids. This event caused at least some degree weakening ~260 m.y. their pervasive structural overprint preservation despite orogenic processes confirms as powerful tool which unveil pre-orogenic events metagranitoids. Our analytical approach broadens insights into water cycle middle crust orogens.
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ژورنال
عنوان ژورنال: Geology
سال: 2022
ISSN: ['0091-7613', '1943-2682']
DOI: https://doi.org/10.1130/g50028.1