Study on the fluid inclusions from Jiama skarn copper polymetallic deposit and Qulong porphyry copper deposit in Gandese copper belt, Tibet

The dominant fluid inclusions in Jiama skarn ore deposit related to metallogensis include liquid-rich, gas-rich two-phase and daughter-minerals hearing polyphase types, homogenization temperature of the fluid inclusions ranges from 2407 to >500 degrees C. The formation of ore deposit has undergone multistage mineralization, the temperature of the garnet formed at early anhydrous stage is above 500 degrees C,the hydrous skarn stage is the main stage for the precipitation of sulfides minerals, its formation temperature is within the range of mesothermal (270 degrees C to 360 degrees C). The study of mineralogy aggregation, features of different types of fluid inclusions and the analytic results get by Laser Laman Spectroscopy, indicated that the ore-forming fluids is of high-salinity and riched in the constituents of Na, K, Ca, Si, Cl-, SO42-, CO32-. Jiama copper polymetallic deposit is a typical high-temperature canbonate-hosted skarn deposit. Comparing the fluid inclusions and stable isotopes of Jiama skarn deposit with that of Qulong porphyry copper deposit near Jiama has shown that the two ore deposits belong to the same metallogenetic series.