大兴安岭南段巴彦高勒银多金属矿地质地球化学特征及找矿标志  

Geological and geochemical characteristics and prospecting marks of the Bayan’gaole silver-polymetallic deposit in the south Daxinganling mountains

作　　者：朵兴芳 屠立鹏 李志丹 王丽瑛[1] 魏子鑫 王俊[3] 高洪生[1] DUO Xingfang;TU Lipeng;LI Zhidan;WANG Liying;WEI Zixin;WANG Jun;GAO Hongsheng(Tianjin Geological Survey Research Institute, Tianjin 300191, China;Tianjin Center, China Geological Survey, Tianjin 300170, China;Geophysical Exploration Academy of China Metallurgical Geology Bureau, Baoding 071051, Hebei, China)

机构地区：[1]天津市地质调查研究院,天津300191 [2]中国地质调查局天津地质调查中心,天津300170 [3]中国冶金地质总局地球物理勘查院,河北保定071051

出　　处：《地质找矿论丛》2020年第4期390-398,共9页Contributions to Geology and Mineral Resources Research

基　　金：全国矿产资源国情调查与综合评价项目(编号:DD20190606);中国地质调查局地质调查项目(编号:DD20190119)联合资助。

摘　　要：巴彦高勒银多金属矿是大兴安岭南段新发现的一例小型银多金属矿床,矿体多呈脉状、透镜状产于古元古界锡林郭勒杂岩中,受NE向断裂控制。矿石矿物主要有方铅矿、闪锌矿、黄铁矿、辉银矿、黝锑银矿等,脉石矿物主要有萤石、毒砂、石英、绿帘石、绿泥石等。围岩蚀变主要为褐铁矿化、硅化、高岭土化、黄铁矿化、绿泥石化、绿帘石化等。通过在该矿区开展1∶1万土壤地球化学测量,共圈定出编号为Ht1至Ht4的4个矿致组合异常区,并发现了对应的矿脉和蚀变带。根据矿体发育部位和围岩蚀变分带特征,推测成矿与热液活动有关,矿床成因为中低温热液型。通过分析成矿地质特征,得出该矿床浅表以褐铁矿化,深部以硅化、高岭土化为重要的找矿标志,北东向构造破碎带是重要的控矿构造,而1∶1万土壤地球化学测量成果圈出的Ag、Pb、Zn单元素地球化学异常及Ag-Sb-Sn-Cu-Pb-Zn组合异常是十分有效的化探标志。Bayan’gaole silver-polymetallic deposit is a small size deposit newly discovered in the south Daxinganling mountains.Ore bodies are hosted in the Palaeoproterozoic Xilinguole complex occurring as veins and lenticular bodies controlled by NE faults.Galena,sphalerite,pyrite,argentite and dyscrasit are the main ore minerals and fluorite,arsenopyrite,quartz,epidote and chlorite the main gangue minerals.The wall rock alterations are mainly limonitizaation,silicification,kaolinization,pyritization,chloritization and epidotization.Soil geochemical survey at scale 1∶10000 shows 4 combination anomlies i.e.Ht-1 to Ht-4 and corresponding ore veins and alteration zones encountered.According to locations of ore body and the wall rock alteration zoning we consider the mineralization to be related to hydrothermal activity and the ore deposit a medium-low temperature hydrothermal type.Through analysis of the metallogenic characteristics,we concluded that the limonitization at surface and shallow depth and the silicification and kaolinization to depth are the main prospecting marks.The NE tectonic fracture zone was the mian ore-controlling structure.The Ag,Pb and Zn single element geochemical anomaly and the Ag,Sb,Sn,Cu,Pb combination anomaly the geochemical prospecting marks.

关 键 词：银多金属矿 地质特征 找矿标志 巴彦高勒 大兴安岭南段 内蒙古 

分 类 号：P618.52[天文地球—矿床学] P632.1[天文地球—地质学]