内蒙古准好来铜矿床地质特征及成因探讨

准好来铜矿床位于大兴安岭南段成矿带中段,产于晚古生代弧后盆地内"双峰式"海相火山岩地层中。通过对大地构造环境、地层层序、含矿建造岩石组合及岩石化学成分等分析研究,总结了矿床地质特征,并对矿床的成因进行了探讨。结果表明,该矿床形成于晚古生代弧后盆地发育阶段的海底喷流沉积作用,与古生代活动大陆边缘成矿系统相关,属广义上的块状硫化物矿床,具有层控性、分带性等特点,其成因与岩性、火山机构及后期断裂构造密切相关,找矿标志明显,找矿潜力较大。

Geological characteristics and genesis of Zhunhaolai copper deposit in west Ujimqin Banner, Inner Mongolia

The Zhunhaolai Copper deposit is located in the middle of southern Daxinganling metallogenic belt, and it occurs in the"Bimodal"marine volcanic rock stratum in the late Paleozoic back-arc basin. Based on the analysis of the tectonic environment, stratigraphic sequence, ore-bearing rock assemblage and petrochemistry, the geologic characteristics of the deposit are summarized and the genesis of the deposit is analyzed in the paper. The results show that the deposit formed in the sea floor exhalation sedimentation environment of the late Paleozoic back-arc basin and the formation of the deposit is related to the metallogenic system of Paleozoic active continental margin. Meanwhile, it belongs to general massive sulfide deposit which is of stratabound and zonality. Its origin is closely related to the lithology, volcanic edifice and the later fault structure. Hence, the Zhunhaolai Copper deposit shows obvious indidactors and has a good potential for prospecting.