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安徽铜陵铜官山铜矿田是中国长江中、下游铁、铜、硫、金成矿带中著名的矽卡岩型矿床。马山金硫矿床位于安徽铜陵铜官山矿田,侵入岩体为天鹅抱蛋山石英闪长岩。文章通过对马山金硫矿床的氢、氧、碳、硫、硅同位素组成和稀土元素地球化学特征研究,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,稀土元素球粒陨石标准化组成模式为右倾型,矿石的稀土配分曲线类似于天鹅抱蛋山石英闪长岩,认为形成该矿床的热液流体主要来源于闪长质熔体。马山金硫矿床矿石中石英的δ18OH2OV-SMOW变化范围为6.9‰~10.7‰,平均为8.7‰,与岩体的δ18OV-SMOW值(9.3‰~11.1‰,平均为10.0‰)比较接近,而矿石中石英的δDV-SMOW变化范围为-69‰~-62‰,表明矿石成矿流体主要来自岩浆。矿石中方解石的碳、氧同位素组成与矿区围岩的碳、氧同位素组成明显不同,其δ13CV-PDB、δ18OV-SMOW值分别为-5.2‰~-3.6‰和12.2‰~12.9‰,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水来源的特点。
Tonglingshan Copper Mine, Tongling, Anhui, is a well-known skarn deposit in the iron, copper, sulfur and gold metallogenic belt in the middle and lower reaches of the Yangtze River in China. Mashan gold sulfur deposit located in Tongling Mountain, Tongling, Anhui Province, intrusive rock swan holding egg quartz quartzite. In this paper, we study the isotopic composition of hydrogen, oxygen, carbon, sulfur and silicon and the geochemical characteristics of rare earth elements in the Mashan gold-sulfur deposit to discuss the source of water, carbon, silicon and sulfur and the evolution of ore-forming solution in the ore-forming solution. The results show that the normalized compositional mode of REE chondrite is right-tilted and the REE distribution curve of ore is similar to that of the swan intrusion. It is believed that the hydrothermal fluids that form this deposit mainly come from the dioritic melt. The δ18OH2OV-SMOW of quartz in the ore from Mashan gold-sulfur deposit varies from 6.9 ‰ to 10.7 ‰ with an average of 8.7 ‰, which is close to the δ18OV-SMOW value of 9.3 ‰ ~11.1 ‰ (averaged 10.0 ‰) The δDV-SMOW of quartz varies from -69 ‰ to -62 ‰, indicating that the ore-forming fluid is mainly derived from magma. The δ13CV-PDB and δ18OV-SMOW values of calcite in the ore are obviously different from those of the surrounding rock in the ore area. The δ13CV-PDB and δ18OV-SMOW values are -5.2 ‰ ~ -3.6 ‰ and 12.2 ‰ ~ 12.9 ‰, respectively, The formed carbon and oxygen isotopic compositions are consistent, indicating that the calcite carbon and oxygen in the ore are derived from magmatic activity. Silicon and sulfur with deep magmatic or magmatic hydrothermal water source characteristics.