Metallogenesis of vein-type U-deposits in the Bohemian Massif, constrained by U–Pb uraninite-apatite dating and AFT thermochronology
| Autoři | |
|---|---|
| Rok publikování | 2025 |
| Druh | Článek ve sborníku |
| Konference | 18th SGA Biennial Meeting 2025, Volume 1 |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | https://www.e-sga.org/publications/conference-proceedings |
| Klíčová slova | U-deposits; SIMS U-Pb dating; AFT thermochronology; metallogenetic model |
| Přiložené soubory | |
| Popis | Although the Bohemian Massif hosts significant vein-type U-deposits associated with shear zones, their metallogenetic model in the frame of the Central European Variscides is poorly constrained due to the lack of geochronological data. This contribution presents the first SIMS U-Pb age of 270.8 ± 7.5 Ma obtained so far for the U-mineralization from the Bohemian Massif. This age coincides with the main U mineralizing events in the entire Variscan Orogenic Belt, including large metallogenic provinces in the Massif Central, Armorican Massif, Black Forest, and Erzgebirge. The recognition of the Permian mineralizing event indicates that the metallogenesis of U-deposits in the Bohemian Massif was linked to the lithospheric extensional events responsible for the coeval exhumation of the metamorphic complexes and the formation of the Late Carboniferous to Lower Permian sedimentary basins that generated oxidizing basinal fluids percolating through and liberating U from the crystalline basement. The AFT thermochronology along with U-Pb apatite dating reflects the rapid Permian exhumation of the crystalline basement, which allowed the influx of oxidized basinal brines mixed with meteoritic waters, which are the most important ore-forming fluids in the entire European Variscan Belt. |
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