内蒙古东乌旗呼布敦陶勒盖锑矿成矿地质特征及成因探讨

Geological characteristics and discussion on genesis of Hubudun Tuolergai Sb deposit in Inner Mongolia

内蒙古东乌珠穆沁旗呼布敦陶勒盖锑矿床是大兴安岭中段首次发现的锑矿床,规模已达中型。矿体赋存于安格尔音乌拉组一段(D_(3)a^(1)),受近EW向断裂控制作用明显,断裂内的次级裂隙是辉锑矿矿化富集的主要地段。矿体围岩为变质粉砂岩夹碳质板岩、含碳泥质板岩等;含矿岩系中As、Bi、Sb、Mo、W、Zn、Au、Pb、Cd单元素的高背景值、As-Sb异常组合及其高浓度分带的特征可作为间接找矿标志。基于成矿地质特征、矿体特征等分析,呼布敦陶勒盖锑矿床成因类型应属于碎屑岩地层中的热液型矿床,成矿过程与晚古生代二叠纪末古鄂霍茨克洋闭合过程中陆陆碰撞期间的俯冲、增生造山作用有关。该矿床的发现,为内蒙古地区增加了新的找矿潜力、找矿方向。

The medium-sized Hubudun Tuolergai is the first Sb deposit discovered in East Ujimqin Banner in the Middle Daxing Angling mountains.Ore bodies occur in the first member of the Angeryinwula formation and are clearly controlled by EW fault.Mineralization is concentrated in sub-fractures within the fault.Meta-siltstone and the intercalated carbonaceous slate and carbonaceous argilaceous slate are the wall rock.High single element background value of As,Bi,Sb.,Mo,W,Zn,Au,Pb,Cd and the As-Sb anomaly and the high concentration zoning can be used as indirect prospecting marks.Based on the metallogenic geological and ore bodies'characteristics the Hubudun Tuolergai Sb deposit is genetically a hydrothermal deposit in detrital strata related to continent-continent collision caused by subduction and accretion orogenesis during closure of Paleookhotsk ocean at end of Permian Epoch.