Abstract
On the basis of results of the studies of primary fluid inclusions, and the hydrogen and oxygen isotope data, the authors concluded that the early-stage ore-forming fluid from the Jinchangqing gold (copper) ore deposit is a kind of sulfate type hot brine characterized by medium temperature and salinity, genetically related to the late-stage ore-forming fluid derived from an acidic and more reductive environment. However, the late-stage ore-forming fluid is a sort of low temperature and low salinity chloride-type hot brine which originated from a lower pressure, acidic and more oxidative environment. In general, the ore fluids were derived from the late-stage, or largely from the early-stage groundwater-derived meteoric water, which has a 12% – 17% heavier oxygen isotopic composition than the original rain water (δ18O = — 15. 3%), and were formed during gold mineralization as a product of oxygen isotope exchange during the reaction between ore-forming fluid and wall rocks under a lower water/rock ratio condition.
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This research project was granted jointly by the 95’ State Key Science and Technology Projects (96-914-03-04), Research Projects in 95’ Key Regions and Zones sponsored by the original Non-ferrous Metal Industry General Company (96-D-42), the State Key Basic Research, Development and Planning Program (G1999043208) and the Foundation Projects of Yunnan Provincial Education Department (0142104).
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Mingqin, H., Huanbin, S., Jiajun, L. et al. Characteristics and origin of ore-forming fluids of Jinchangqing gold (copper) ore deposit (s) in Xiangyun, Yunnan Province. Chin. J. Geochem. 24, 136–143 (2005). https://doi.org/10.1007/BF02841156
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DOI: https://doi.org/10.1007/BF02841156