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EMPA U-Th-total Pb dating of uraninite from the Stara Kamienica schist belt (West Sudetes, SW Poland) : new data towards interpreting the genesis of cassiterite-sulphide mineralization

Małek Rafał, Mikulski Stanisław Z.

Geological Quarterly

2024

Vol. 68, No. 4

art. no. 36

Electron microprobe analyses of mineral samples from archival drilling cores from the Stara Kamienica schist belt, Western Sudetes, were applied to help interpret cassiterite-sulphide mineralization known for centuries, but still of unclear origin. The new data, including EMPA U-Th-total Pb dating of uraninites coeval with cassiterite-sulphide mineralization, help inform discussion of the genesis of this tin mineralization. The uraninites analyzed, scattered within micas in the schists, have homogeneous internal structure without any cracks and clear grain edges, which may indicate their hydrothermal origin. Results of uraninite dating indicate two age ranges: approximately 300–310 and 345–360 Ma, which may suggest crystallization of the cassiterite-sulphide mineralization during hydrothermal metasomatic processes related, respectively, to regional metamorphism and the final emplacement of the Karkonosze granitoid intrusion.