黑龙江省砂宝斯金矿床同位素地球化学特征与成矿物质来源

为了确定砂宝斯大型金矿床的成矿热液和成矿物质的来源,在矿床地质特征研究的基础上,选取金矿石中与金矿化密切相关的石英和黄铁矿分别进行了H、O和S、Pb同位素的测试工作。结果表明:石英中的δD变化范围为-138.3‰~-117.8‰,δ~(18)O_水变化范围为4.6‰~5.6‰,δD-δ~(18)O水图解上,6件样品落入以岩浆水为主体并混有大气降水的区域;矿石中黄铁矿的δ~(34)S值介于-9.6‰~-8.3‰,集中于0.2‰~5.6‰,表现出离散性较大的混合硫的特征;黄铁矿的~(206)Pb/~(204)Pb、~(207)Pb/~(204)Pb和~(208)Pb/~(204)Pb值的变化范围分别为17.75~18.45、15.48~15.69和37.76~38.44,在铅同位素构造模式图解和Δβ-Δγ成因分类图解中,表现为岩浆作用所导致的上地壳地幔混合铅。综合分析认为,砂宝斯金矿床的成矿热液主要来自岩浆热液,并有天水加入,成矿物质具有以岩浆为主并混有地层物质的特征。

Isotopic geochemistry and metallogenic material source of Shabaosi Gold Deposit in Heilongjiang Province

In order to determine the source of ore-forming materials and hydrothermal fluids of Shabaosi large-scale gold deposit , the paper based on the study of geological features in the deposit picked up quartz and pyrites closely related to gold mineralization from the gold ores ,and carried out test work on the isotopes of H ,O and S ,Pb re-spectively.The results show that the range of δD in quartz is -138.3‰to -117.8‰,the range of δOH2O is 4.6 ‰to 5.6 ‰;inδD-δOH2O diagram,6 samples fall into the area of magmatic water with meteoric water; the range ofδ34 S in pyrite is -9.6‰to -8.3‰and concentrates between 0.2‰and 5.6‰,exhibiting a dispersive feature of mixed sulfur;the ranges of 206 Pb/204 Pb,207 Pb/204 Pb and 208 Pb/204 Pb in pyrite are 17.75 to 18.45,15.48 to 15.69 and 37.76 to 38.44.In Pb isotope diagram and Δβ-Δγdiagram,lead is mixed from both upper crust and mantle by mag-matism.Comprehensive analysis takes that the ore-forming hydrothermal fluids of Shabaosi Gold Deposit are from mag-matic fluids in addition to some meteoric water and the ore-forming materials primarily derive from magma and are mixed with the feature of stratum matters .