【摘要】 东天山彩霞山大型铅锌矿床位于中天山地块北缘，矿体主要产于白云石大理岩与下伏的硅化粉砂岩接触部位，其热液期成矿作用可分为4个阶段：黄铁矿阶段、闪锌矿-黄铁矿阶段、闪锌矿-磁黄铁矿-透闪石阶段、硫盐-方铅矿阶段。前人获得成矿时代数据范围跨度大，直接影响了对矿床成因的认识。本次工作选取不同矿体矿石中33件金属硫化物，分期次开展Rb-Sr同位素测年，获得了（326.5±4.2）Ma、(315.3～312.9) Ma、(302.3～299) Ma等前3个成矿阶段的年龄，结合成矿地质特征和前人有关东天山区域构造演化的研究成果，认为彩霞山铅锌矿的成矿构造背景为弧前盆地向弧内盆地转换阶段，是东天山造山带晚石炭世构造-岩浆活动的产物。更多还原

【Abstract】 Caixiashan giant Pb-Zn deposit in East Tianshan is located in the north margin of the middle Tianshan massif. The ore bodies mainly occur in the contact areas between dolomite marble and underlying siltstone. The hydrothermal mineralization can be divided into four stages: Pyrite, Sphalerite-pyrite, Sphalerite-pyrrhotite-tremolite, Sulfate-galena. The large range of ore-forming ages obtained by predecessors makes the genesis of this deposit debatable. Therefore,33 sulfides from different stages of this deposit were selected and Rb-Sr isotopic dating was carried out. We obtained oreforming ages of the three stages,(326.5±4.2)Ma,( 315.3～ 312.9)Ma and(302.3～299)Ma. Combined with metallogenic geological characteristics and previous research achievements on regional tectonic evolution in the East Tianshan, we believe that the mineralization occurred in fore/intra-arc basin inversion stage. The metallogeny is the product of the tectonic-magmatic activity of the Late Carboniferous in the East Tianshan orogenic belt.更多还原