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朝山金矿床位于安徽铜陵狮子山矿田 ,属于矽卡岩型金矿床 ,侵入岩体为白芒山辉石二长闪长岩体。成矿过程包括矽卡岩阶段、石英_硫化物阶段和碳酸盐阶段 3个主要成矿阶段。文章通过对朝山金矿床的氢、氧、碳、硫、硅同位素组成和稀土元素地球化学特征的研究 ,探讨成矿溶液中水、碳、硅和硫的来源以及成矿溶液的演化问题。研究表明 ,成矿热液早期以岩浆热液为主 ,随着成矿过程的进行 ,加入的大气降水比重越来越大 ,到晚期可能主要以大气降水为主。该矿床矿石中方解石的碳、氧同位素组成与矿区大理岩的碳、氧同位素组成明显不同 ,其δ13CV_PDB、δ18OV_SMOW值分别为 - 4 .5～ - 5 .3‰、13.9～ 14 .0‰ ,与岩浆作用形成的CO2 的碳、氧同位素组成一致 ,表明矿石中方解石的碳、氧来源于岩浆作用。硅和硫具深部岩浆或岩浆热液来源的特点。
The Jiashan gold deposit is located in the Shizishan ore field, Tongling, Anhui Province and belongs to the skarn-type gold deposit. The intrusive rock is the Baishi Mangdexene diorite body. The metallogenic processes include skarn stage, quartz-sulphide stage and carbonate stage. In this paper, by studying the hydrogen, oxygen, carbon, sulfur and silicon isotopic composition and REE geochemical characteristics of the Dashan gold deposit, the source of water, carbon, silicon and sulfur and the evolution of ore-forming solution in the ore-forming solution are discussed. The results show that the hydrothermal fluid is dominated by magmatic hydrothermal fluid in the early stage, and the proportion of atmospheric precipitation added to it increases with the progress of mineralization, which may be dominated by atmospheric precipitation in the late stage. The carbon and oxygen isotopic composition of the calcite in this ore deposit is obviously different from that of the marble in the ore area. The δ13CV_PDB and δ18OV_SMOW values of the calcite in this ore deposit are -4.5-5.3%, 13.9-14.0% and The carbon and oxygen isotopic compositions of CO2 formed by magmatism are consistent, indicating that the calcite in the ore has carbon and oxygen originating from magmatic activity. Silicon and sulfur with deep magmatic or magmatic hydrothermal source characteristics.