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核桃坪铅锌多金属矿床是云南保山地块近年来所发现的一个大型多金属矿床,地勘工作显示该类型矿床在该区具良好的找矿前景。对矿区围岩及矿石矿物的硫同位素组成、铅同位素组成与氢、氧同位素进行系统研究与对比,结果表明:矿床中的δ34S‰的变化区间较窄,在+2.9‰～+6.6‰之间,峰值集中于+4.5‰～+5.5‰,具有深部岩浆硫同位素组成特征;硫化物单矿物(闪锌矿和方铅矿)及矿石铅的铅同位素组成以高μ值和低放射性成因铅为特征,显壳源铅的特征,暗示矿床成矿物质以壳源为主;与硫化物共生的石英δ18OV-SMOW变化范围在+10.5‰～+12.1‰之间,平均值为+11.3‰,极差为1.6‰,δDV-SMOW值为-109‰～-91‰,平均值为-100.8‰,极差为-8‰,表明成矿流体主要来源于深部的岩浆水,可能遭受了后期的大气降水或者是底层建造水的混合。结合矿床地质特征,笔者认为本矿床的成矿物质主要与深部隐伏岩体有关,属于与深部岩浆热液活动有关的夕卡岩型矿床。
The lead-zinc polymetallic deposit in Walnutping is a large polymetallic deposit discovered in recent years in Baoshan block, Yunnan Province. Geological prospecting shows that this type of deposit has a good prospecting prospect in this area. Sulfur isotope compositions, Pb isotopic compositions and hydrogen and oxygen isotope compositions of the surrounding rocks and ore minerals in the ore district are systematically studied and compared. The results show that the variation range of δ34S ‰ in the ore deposit is relatively narrow, ranging from + 2.9 ‰ to + 6.6 ‰ , With a peak concentrated at +4.5 ‰ ~ + 5.5 ‰, which has the characteristics of deep magmatic sulfur isotopic composition. The lead isotopic composition of sulfide single minerals (sphalerite and galena) and ore lead is characterized by high μ value and low radiogenic lead The characteristics of lead and lead in the crust indicate that the metallogenic material of the deposit is dominated by the crust. The δ18OV-SMOW coexisting with sulfides ranges from + 10.5 ‰ to + 12.1 ‰ with an average of + 11.3 ‰, The δDV-SMOW values ranged from -109 ‰ to -91 ‰, with an average of -100.8 ‰ and an extreme difference of -8 ‰, indicating that the ore-forming fluids mainly originated from deep magmatic water and may have suffered from the later atmosphere Precipitation or mixing of groundwater. Combined with the geological characteristics of the deposit, I believe that the ore-forming material of this deposit is mainly related to the deep concealed rock mass, and belongs to the skarn deposit associated with the deep magmatic hydrothermal activity.