额济纳旗碧玉岭铜矿田成矿特征及找矿标志
Characteristics and Ore-Prospecting Indicators of Copper Deposits in Biyuling Ore Field, Ejinaqi
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摘要: 碧玉岭铜矿区产出于塔里木-华北板块与哈萨克斯坦板块缝合带,其形成与中奥陶统幔源基性火山喷发活动间歇期海底热液喷流活动有关。容矿岩石为碧玉岩,属于含铁硅质岩类的典型喷流岩或热水沉积岩,是同生成矿阶段的主要产物。造山期矿质发生活化迁移,在断裂破碎带中再次富集成矿,因此矿体分布受喷流岩带与断裂破碎带双重控制。浸染状-块状硫化物矿化受碧玉岩层位与岩性控制,矿化体受断裂破碎带控制。结合成矿地质特征及矿物元素的组合异常特征,初步认为该区的找矿标志为:基性火山岩-碧玉岩-孔雀石、褐铁矿、石膏-Cu、Zn、Ba异常。Abstract: The Biyuling copper depositis situated on the suture zone between Tarim-North China Plate and Kazakhstan Plate,which is related to the seaflo or hydrothermal activity during the intermission of the basic volcanic activity in the Middle Ordovician.The containing or erocks are jasper rocks,and they belong to the typical exhalative rock or hydrothermal sedimentary rock of containing iron cherts,which are the major productions in the period of the contemporaneous ore-forming.The mineral matters had occurred activated movement in the orogenic time,then the ore bodies enriched again in the crushed zones. So the distribution of ore bodies is controlled by the exhalative rock belts and the crushed zones.The jasper rock level and lithological character dominate the metallization of the disseminated and massive sulfides,and the ore bodies are controlled by the crushed zones;Intergrate the geological and element assem blage anomalies,we suggest that the propecting criteria is meta-volcanics,jasper rocks,Cu2(CO3)(OH)2,limonite,CaSO4 and element assem blage anomalies of Cu-Zn-Pb.
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