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Abstract

The recently discovered Mokrsko deposit represents the largest gold deposit in the Bohemian massif. The deposit occurs in upper Proterozoic volcano-sedimentary rocks of the Jilove belt (640-700? Ma) and in granodiorite of Hercynian age (320-360 Ma). Gold-bearing quartz mineralization of vein and stockwork types is structurally and lithologically controlled. The lack of wall-rock alteration and the similar chemistry of amphibole and biotite from quartz veins and adjacent rocks suggest similar P-T conditions of origin. The temperature ranges obtained for the quartz veins (fluid inclusions: 250°-350°C; oxygen isotopes: 330°-420°C) and the temperatures and pressure of the adjacent rocks (500°-630°C); P<0.4 GPa) indicate that the gold mineralization occurred in the same temperature ranges as epidote-amphibolite and lower amphibolite facies metamorphism. The rock geochemistry suggests a hydrothermal metamorphic mobilization of gold from upper Proterozoic rocks with a possible enrichment by magmatic fluids.

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