广西大厂锡多金属矿床S、Pb同位素组成对成矿物质来源的示踪

为了查明广西大厂锡多金属矿床成矿物质来源，本文对不同类型、不同产状矿体的硫、铅同位素的组成进行分析和对比研究。结果表明：大厂不同类型或产状的矿体，其成矿物质来源是相同的；硫同位素特征显示，锌铜矿体为典型的岩浆硫来源，锡矿体为混合硫来源，硫同位素比值的变化与成矿过程和环境有关，反映深部来源成矿流体在由下向上的运移过程中，有围岩组分的加入。铅同位素特征表明，铅的来源主要为与岩浆作用有关的壳源铅，但也有上地壳及壳幔混合来源的铅参与

Sulfur and Lead Isotope Composition Tracing for the Sources of Ore-Forming Material in Dachang Tin-Polymentallic Orefield,Guangxi

To discern the material sources of the Dachang tin-polymetallic deposit,this paper analyzes and compares sulfur and lead isotope data of the orebodies with different mineralization types or occurrences from the deposit.The results indicate that the orebodies with different type and occurrence originated from the same source.Sulfur isotopic evidence indicates that Zn-Pb orebodies are typical magmatic sulfur in origin,Sn orebodies in mixed origin.Change of sulfur isotopic ratios is related to ore-formed process and environment,reflecting that there was a foreign components from country rock involving mineralization during the movement of deep-derived ore-forming fluid from low to upper.Lead isotope data indicate that lead originates mainly from the crust-derived magmatism but doesn't exclude involvement of Pb from the igneous intrusion.