新疆阿尔金断裂北缘喀腊大湾铜多金属矿床地质特征及控矿因素

通过对区域含矿岩系、火山作用、构造演化与矿产等开展地质调查表明:这些矿床产于塔里木地块古陆缘红柳沟-拉配泉元古代裂谷带、喀腊达坂大断裂北侧,含矿地层为蓟县系卓阿布拉克组变质火山岩,具有典型的双峰式火山岩建造特点,成矿作用发生于火山喷发旋回的间歇期。通过对典型矿床喀腊大湾铜多金属矿床地质特征及控矿因素研究,表明该矿床具明显的矿化分带和蚀变分带,δ(34S)测定反映硫大部分来源于海水,成因类型属与海相火山作用有关的喷气-喷流型硫化物矿床,该矿床的主要控矿因素为海相沉积地层、火山喷发的间歇期和断裂构造等,变质作用对成矿有一定的富集作用。

Geological Feature and Ore-Controlling Factors of Kaladawan Copper-Polymetal Deposit in Northern Side of Altyn Fault,Xinjiang

From the researching on regional geology, ore-bearing rocks, volcanic and tectonic evolution, manycopper-polymetal deposits were discovered in the northern side of Altyn fault in recent years, which has laid afoundation for prospecting mineral resources in the Altyn mountains. The study shows that these metal depositsdistribute in Proterozoic Hongliugou-Lapeiquan rift at the continental margin of the Tarim plate and northern sideof the Kaladaban fault. The ore-bearing stratum is matevolcanics of Zhuoabulake formation of Jixian system.These volcanic rocks show some characteristics of bimodal volcanic rock. The copper-polymetal mineralizationoccurred during the intermittent eruption of the volcanic activity. There are obvious mineralization and alterationzone in the ore area. The isotopic composition of sulfur indicates that its source is sea water and the deposit is amassive sulfide-type deposit formed in submarine exhalation process.