摘要
小池沟金矿床位于秦岭造山带熊耳山变质核杂岩构造中段。通过对该矿床主成矿阶段形成的蚀变岩型矿石中硫、铅同位素分析,获得矿床硫同位素δ^(34)S值为-3.05‰～10.93‰,多数位于陨石硫范围内,表明硫主要来源于地幔,并有地壳硫加入,反映了地幔硫遭受地壳物质混入后的硫同位素组成;铅同位素^(206)Pb/^(204)Pb值为17.09～17.53,^(207)Pb/^(204)Pb值为15.31～15.61,^(208)Pb/^(204)Pb值为37.20～38.10,变化范围均不大,属于正常铅范围。铅同位素特征参数及相关图解显示矿石铅具壳幔混合特征。硫、铅同位素组成表明,该矿床的成矿物质以幔源为主,为深部幔源物质混合了壳源物质。
Xiaochigou Gold Deposit is located in the middle of Xiongershan metamorphic core complex in Qinling orogenic belt.Based on the analysis of sulfur and lead isotopes in altered rock type ores formed in the main metallo-genic stage of the deposit,it is found that theδ34 S of sulfur isotope of the deposit is between-3.05‰and 10.93‰,mostly remaining within the range of meteorite sulfur,indicating that the sulfur mainly comes from the mantle with the addition of crustal sulfur,which reflects the sulfur isotopic composition of mantle sulfur after being mixed with crustal materials.The lead isotope 206 Pb/204 Pb value is 17.09-17.53,207 Pb/204 Pb value is 15.31-15.61,and 208 Pb/204 Pb value is 37.20-38.10.The variation range is not wide,belonging to normal lead range.Lead isotopic characteristic parameters and related diagrams show that the lead in ores has crust-mantle mixing characteristics.The sulfur and lead isotope compositions show that the ore-forming materials of the deposit are mainly mantle-derived materials,and the deep mantle-derived materials are mixed with crust-derived materials.
作者
刘征华
罗正传
李田园
李增辉
包文童
Liu Zhenghua;Luo Zhengzhuan;Li Tianyuan;Li Zenghui;Bao Wentong(Henan Nonferrous Mineral Exploration Engineering Research Center;No.6 Geological Team of Henan Province Nonferrous Metals Geological Mineral Resources Bureau;Henan Nonferrous Metals Geological Exploration Institute;No.7 Geological Team of Henan Province Nonferrous Metals Geological Mineral Resources Bureau)
出处
《黄金》
CAS
2019年第1期22-25,共4页
Gold
基金
河南省国土资源科研项目(豫国土资函[2017]237号-02)
关键词
小池沟金矿床
硫铅同位素
同位素组成
地球化学特征
成矿物质来源
Xiaochigou Gold Deposit
sulfur and lead isotope
isotopic composition
isotopic geochemistry
metal-logenic material source
