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通过测定相山铀矿成矿期方解石的δ13 CPDB和δ18 OSMOW值,分别为-3.2‰～-7.4‰,1.7‰～15.2‰,表明成矿流体中矿化剂CO2主要来源于地幔去气,且δ13 CPDB与δ18 OSMOW呈负相关关系,暗示CO2去气作用或流体与围岩间的水-岩反应可能是导致方解石沉淀的主要机制。萤石的流体包裹体中水的δ18 O值为-1.4‰～-9.0‰,δD值为-68‰～-90‰;石英的δ18 O值为2.4‰～4.4‰,δD值为-59‰～-71‰,属大气降水成因流体,成矿过程中发生的水-岩相互作用对流体氢氧同位素组成特征具有重要影响;S2-作为还原剂对铀沉淀也起了很大的作用;黄铁矿的δ34S为+9.6‰～+19.55‰,成矿流体中的硫可能主要来自围岩。
By measuring the δ13CPDB and δ18OSMOW values of calcite in the Xiangshan uranium mineralization stage, they are -3.2 ‰ ~ -7.4 ‰ and 1.7 ‰ ~15.2 ‰ respectively, indicating that the mineralizer CO2 in the ore-forming fluid is mainly derived from the mantle gas, And the δ13 CPDB and δ18 OSMOW are negatively correlated, suggesting that CO2 degassing or water-rock reaction between fluid and surrounding rock may be the main mechanism leading to calcite precipitation. The δ18O values of water in fluid inclusions of fluorite range from -1.4 ‰ to -9.0 ‰, the δD values are from -68 ‰ to -90 ‰, the δ18 O values of quartz are from 2.4 ‰ to 4.4 ‰, and the δD values are -59 ‰ ~ -71 ‰, belonging to the genesis of precipitation, and the water-rock interaction during mineralization has an important influence on the composition of hydrogen and oxygen isotopes. S2- as a reductant also plays a very important role in the precipitation of uranium. Yellow The δ34S of iron ore is + 9.6 ‰ ~ + 19.55 ‰, and the sulfur in ore-forming fluids may come mainly from the surrounding rock.