Isotopic Constraint of S-H-O on Ore-Forming Fluids Origin of the Congjiang-Nage Cu Multiple-Metallic Ore Deposit,Southeast Guizhou Province

The Nage Cu multiple-metallic ore deposit is located in the transitional zone of the Yangtze craton and Cathaysia,which is the southwest of Jiangnan orogenic belt,and is a representative ore deposit of this region. Isotopic geochemistry of S,H and O is analyzed in this paper to help understand the sources of the ore-forming fluids. The δ34 SV-CDT values of the ores sulfides show a total range from -2.7‰ to 2.8‰,the average value is 0.1‰,and most of them are between -2.5‰ and 2.5‰,indicating that the sulfur should be originated from the mantle material. The δDV-SMOW and δ18OH2O values of the gangue quartz inclusion range from -60.7‰ to -44.4‰ and from 7.9‰ to 9.0‰,respectively. In the diagram of δD versus δ18O,all samples fall into the region of magmatic and/or metamorphic water,which means that the ore-forming fluids were provided by the mantle and/or the hosted-metamorphic sedimentary rocks. This work suggests that the mineralization fluids of this deposit have a characteristic of multiple sources.