Mineralogická charakteristika polymetalického rudního výskytu Hostětice u Telče (moldanubikum, Česká republika)

Samples from a small vein Pb-Zn-(Ag) ore occurrence near Hostětice (1.5 km east from the town of Telč, Českomoravská vrchovina Upland, Czech Republic) were studied mineralogically by means of electron microprobe and sulfur stable isotope analyses. Major sulfide minerals are represented by black sphalerite (with 0.044 - 0.192 apfu Fe, 0.005 - 0.006 apfu Cd, and 0.001 - 0.008 apfu Mn), galena (with low both Sb and Ag up to 0.003 apfu) and arsenopyrite (rarely with up to 0.010 apfu Co), which are accompanied by rare pyrite (rarely with up to 0.004 apfu Ni or As), chalcopyrite, and native bismuth. Ore minerals are hosted by quartz gangue with subordinate illite-muscovite, siderite (Sid52-79Mag19-43 Rdc1-3Cal0-2Smi0-2), anatase, and a kaolinite-group mineral. Supergene minerals are represented mainly by scorodite and anglesite and, rarely, by probable zýkaite. The δ34S values of galena and sphalerite range between 2.2 and 5.7 ‰ CDT. Arsenopyrite thermometry, illite compositional thermometry, sulfur isotope thermometry, and stabilities of anatase, muscovite, and a kaolinite-group mineral suggest formation temperatures of primary mineralization between 480 and <200 °C and at least episodically acidic pH of the parent fluids. The mineral assemblage and compositions of minerals from Hostětice resemble the so-called k-pol type of base-metal veins widely occurring in the wider area, however, the formation temperatures seem to be somewhat lower at Hostětice in comparison with typical k-pol mineralization.