首页|Origin of the Yueguang gold deposit in Xinhua,Hunan Province,South China:insights from fluid inclusion and hydrogen-oxygen stable isotope analysis
Origin of the Yueguang gold deposit in Xinhua,Hunan Province,South China:insights from fluid inclusion and hydrogen-oxygen stable isotope analysis
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The Yueguang gold deposit is located in Fengjia,Xinhua County,Hunan Province,South China.It represents a recently discovered small-scale gold deposit situated in the southwestern region of the Jiangnan Orogenic Belt,west of the Baimashan granitic batholith.In order to discern the characteristics of the ore-forming fluids,the underlying mineralization processes,and establish a foundation for the origin of the Yueguang gold deposit fluid inclusion micro-thermometry,as well as quartz hydrogen and oxygen isotope analysis,have been carried out on samples obtained from various stages of mineralization.The hydrothermal miner-alization stages within the Yueguang gold deposit can be categorized into three stages:(i)the barren,pre-ore quartz-pyrite stage(Stage Ⅰ),the quartz-pyrite-gold stage(StageⅡ),and the post-ore quartz-carbonate stage(Stage Ⅲ),with the second stage being the main mineralization stage.The fluid inclusions identified in samples from the main min-eralization stage can predominantly be described with the NaCl-H2O and CO2-NaCl-H2O systems.These inclusions display homogenization temperatures ranging from 158.8 to 334.9 ℃,and the fluid salinity ranges from 0.3％to 4.0％(wt.％NaCl equiv.).Laser Raman spectroscopy analysis of individual inclusions further reveals the presence of gas-phases such as CO2,CH4,and N2.Isotopic analysis indicates δ180 fluid values ranging from 3.95 to 6.7 ‰ and δDH2O values ranging from-71.9 to-55.7 ‰.These results indi-cate that the ore-forming fluid of the Yueguang gold deposit belongs to metamorphic hydrothermal fluids of middle-low temperature and low salinity.In the process of ore formation,gold is transported in the form of Au(HS)2-complexes,with gold deposition being driven by fluid immiscibility.Therefore,the Yueguang gold deposit is categorized as an orogenic gold deposit dominated by metamorphic hydrother-mal fluid.It may become a new target for gold exploration in the Baimashan region,central Hunan Province.
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