Large-scale HFSE and REE mobility linked to the formation of vein-type U-deposits in the Moldanubian Zone of the Bohemian Massif
| Authors | |
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| Year of publication | 2023 |
| Type | Article in Proceedings |
| Conference | Mineral Resources in a Changing World, 17th SGA Biennial Meeting 2023, Volume 3 |
| MU Faculty or unit | |
| Citation | |
| Web | Link pro stáhnutí sborníků abstraktů |
| Keywords | U-deposits; durbachites; hydrothermal alteration; HFSE and REE mobilization; |
| Attached files | |
| Description | Multi-element EMP maps and analyses of major accessory phases and their possible alteration products from ultrapotassic rocks (durbachites), in combination with LA-ICP-MS analyses of hydrothermal U-mineralization, provided constraints on potential U source of vein-type U-deposits in the Moldanubian Zone of the Bohemian Massif. The extensive metal mobilization in durbachites, recorded by EMP imaging, was controlled by self-induced radiation damage (metamictization) and subsequent fluid-driven alteration of U-bearing phases (thorite, allanite, zircon). Unusual trace element signatures of low-T hydrothermal Umineralization (e.g., extremely high Zr, Nb, Ti, ?REE) from the vein-type deposits reflect the large-scale HFSE and REE mobility via aqueous solutions. The character of late alteration of primary phases (zircon dissolution vs. resistance of apatite) and mineral assemblages of hydrothermal phases in durbachites (e.g., synchisite, Frich titanite, monazite) indicates the importance of alkali-, F-, and P-rich fluids in the formation of U-deposits. The infiltration of oxidized, highly alkaline basinal brines likely played a key role in HFSE and REE mobility during the Permian hydrothermal event, as suggested by EMP chemical dating of U-mineralization. |
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