Genetic implication of stable isotope characteristic of Zhaxikang Pb-Zn (Ag, Sb) vein deposit, Southern Tibet in China

The Zhaxikang Pb-Zn (Ag, Sb) deposit is located in south of Lhasa in the Northern Himalaya antimony-gold Metallogenetic Belt. It is hosted in the Jurassic Ridang formation, which is composed of black shale, sandstone slate and siltstone. The mineralization forms sub-vertical veins with comb, ribbon, crack, breccia, massive and zoning textures. Primary fluid inclusions exhibit Th values ranging from 245 degrees C to 279 degrees C with salinities range from 0.7 to 12.3 wt.% NaCl equiv. The delta O-18 and delta D-H2O values of quartz suggest an isotopically heterogeneous fluid source involving mixing between black shale-derived organic-rich water and meteoric water. Sulphur and lead isotopic data are consistent with local derivation from fluid-rock interaction that leached metals from the Mesozoic sedimentary sequence.