Hydrothermal uranium-base metal mineralization of the Jánská vein, Březové Hory, Příbram, Czech Republic: lead isotopes and chemical dating of uraninite

Abstract

The Jánská vein is one of the important veins of Březové Hory mining district (central Bohemia, Czech Republic). Base metals were mined here since 14 th century and uranium ore during late 1950's. Uranium mineralization is younger than most of the base metal mineralization according to macroscopic and microscopic study. Most specimens of uraninite, obtained from archive, contain more or less abundant galena inclusions. Galena of this type is non-radiogenic as indicated by its Pb isotopic composition (ICP-MS). Its origin can be explained by remobilisation of the older base-metal mineralization during the younger, uranium-bearing mineralization event. The amount of radiogenic Pb in uraninite fluctuates from 48 up to 89.8 %. The age of theoretical end member of uraninite, calculated statistically from all measured data (for intersection 208 Pb/ 206 Pb = 0), is 269.8 ± 20.3 Ma (2σ). The only uraninite grain without galena inclusions yielded an age of 263.2 ± 8.9 Ma by chemical dating using electron microprobe. The calculated age of the uranium mineralization is in agreement with published data for other uranium deposits genetically associated with the Central Bohemian Plutonic Complex.

Crystal structure, hydrogen bonding, mechanical properties and Raman spectrum of the lead uranyl silicate monohydrate mineral kasolite

“…The natural mineral sample studied in this work is from the Jánská vein, Příbram base metal ore district, Czech Republic. 48,49 Kasolite sample is an aggregate of lath-like to acicular crystals. This mineral sample was analyzed using Raman spectroscopy.…”

“…The Raman spectra of kasolite was recorded from a natural mineral sample from the Jánská vein, Příbram base metal ore district, Czech Republic. 48,49 The resulting spectrum was compared with the theoretical spectrum computed by using density functional perturbation theory. The theoretical spectrum was computed at T ¼ 298 K, l ¼ 532 nm, FWHM ¼ 20 cm À1 .…”

Uraninite, Coffinite and Ningyoite from Vein-Type Uranium Deposits of the Bohemian Massif (Central European Variscan Belt)

“…The Březové Hory base metal district is usually subdivided into Bohutín, central Březové Hory and Černojamské ore deposits ( Figure 2). The Březové Hory and Černojamské deposits were also shown to contain some uranium mineralisation (Jánská and Černojamská veins) [19,20]. The Příbram uranium district is largely hosted by a Neoproterozoic flysch sequence ( Figure 2).…”

Apatite at Niutoushan U–Pb–Zn deposit in Xiangshan ore field: A tracer for hydrothermal fluid

“…In addition to U–Pb–Zn mineralization, Volcanic‐hosted uranium deposits worldwide are generally intergrown with or associated with Be, Mo, F, Iron‐oxide–Copper–Gold (IOCG), REE–Nb–Ta. In recent years, some scholars probed into the linkage of U and polymetallic mineralization by mineralization ages, abnormal radiogenic Pb isotope composition (e.g., U–Pb–Zn mineralization, McCready & Stumpfi, 2004; Škácha, Goliáš, Sejkora, & Plasil, 2009), and the nature of hydrothermal fluid for transporting both U and metal elements (e.g., IOCG, Hrrzman & Valenta, 2005).…”