青海省巴硬格莉沟—哇沿河多金属矿化带稳定同位素地质与成矿物质来源

通过对青海省巴硬格莉沟—哇沿河多金属成矿带大量矿石及围岩的硫、氢、氧、碳、铅等稳定同位素测试及分析 ,指出该区成矿物质主要来源于幔源物质与壳源物质的混合 ,成矿与矿带外围印支期 (局部包括少量早燕山期 )二长花岗岩及下元古界达肯大坂群大理岩、二云斜长片麻岩关系密切 ,成矿热液具有混合热液性质 ,主要为岩浆水与变质水的混合 ,并有一定量的大气降水加入。因此构造 (哇洪山断裂带及其派生构造 )、岩体 (印支及早燕山期二长花岗岩 )、地层 (达肯大坂群二云斜长片麻岩、大理岩 )“三位一体”是本区多金属找矿工作的有利部位 ,在今后的找矿勘探中应予以重视。

STABLE ISOTOPIC GEOLOGY AND SOURCE OF ORE-FORMING MATERIALS IN BAYINGGELIGOU-WAYANHE POLYMETAL MINERALIZATION ZONES, QINGHAI PROVINCE

The Bayinggeligou-Wayanhe polymetal mineralization zones in Qinghai Province are located in the middle part of the NNW-trending Wahongshan fault belt. Study on the isotopic compositions of S, H, O, C and Pb of ores and rocks shows that the ore-forming materials come from the mixture of mantle and crust materials. The ore-forming fluids mainly came from granitic rocks emplaced in the Indosinian stage (also some granitic rocks formed in Early Yanshanian) and the Dakendaban Group metamorphic rocks in the area. During mineralization, some meteoric water was involved. The superposition localities of faults, the Dakendaban Group metamorphic rocks and the Indosinian granitic rocks are the best positions for mineralization in the area, to which much attention should be paid during ore exploration in the future.