内蒙古阿巴嘎旗查干诺尔铜多金属矿区矿化带特征及矿床成因

Characteristics and Genesis of Mineralization Zones in Chaganuoer Copper Polymetallic Mining Area,Abaga Qi Inner Mongolia

查干诺尔铜多金属矿成矿地质优越,找矿潜力巨大但勘查程度尚浅。在研究区域基础地质和前人工作的基础上,通过野外地质调查、采样与测试分析等手段,研究了查干诺尔铜多金属矿矿床地质特征,探讨了矿床成因。研究结果表明:查干诺尔铜多金属矿矿化体发育于二长花岗岩侵入岩与灰岩外接触带的矽卡岩体内或蚀变二长花岗岩枝附近。矿区主要发育Ⅰ号和Ⅱ号矽卡岩矿化带,带内局部发育铜、钼(钨)矿化。工业铜矿体主要分布在近东西向Ⅰ号和Ⅱ号矽卡岩矿化带内。区内矿体以隐伏矿体和盲矿体为主,矿石主要为原生矿石,氧化矿石较少。矿物成分金属矿物主要为黄铁矿、黄铜矿、辉铜矿、辉钼矿、磁铁矿,其次为白钨矿、钛铁矿,偶见方铅矿、闪锌矿;地表见孔雀石、铜兰。矿石有益元素以铜为主,最低品位为0.20%,最高品位为3.15%,平均品位为0.58%。矿体围岩蚀变褐铁矿化、孔雀石化、矽卡岩化、硅化、绿帘石化、绿泥石化、高岭土化等发育地段。矿床成因类型为中高温热液-矽卡岩型叠加成因,有4大找矿标志。

The Chaganuoer copper polymetallic mineralization has superior mineralization geology and huge prospecting potential,but the exploration level is still shallow.On the basis of studying the basic geology of the research area and previous work,the geological characteristics of the Chaganuoer copper polymetallic deposit were studied through field geological investigation,sampling,and testing analysis,and the genesis of the deposit was explored.The research results indicate that the Chagan Nur copper polymetallic mineralization body is developed within the skarn body of the contact zone between the diorite intrusive rock and the limestone or near the altered diorite branches.The mining area mainly develops the No.Ⅰand No.Ⅱskarn mineralization zones,with local copper and molybdenum(tungsten)mineralization within the zones.The industrial copper ore bodies are mainly distributed in the near east-west orientedⅠandⅡskarn mineralization zones.The ore bodies in the area are mainly concealed and blind,with primary ore as the main ore and less oxidized ore.The mineral composition of metallic minerals mainly includes pyrite,chalcopyrite,molybdenite,and magnetite,followed by scheelite and ilmenite,and occasionally galena and sphalerite;malachite and azurite can be seen on the surface.The beneficial elements in the ore are mainly copper,with a minimum grade of 0.20%,a maximum grade of 3.15%,and an average grade of 0.58%.The surrounding rocks of the ore body have undergone alteration,including limonitization,peacock petrification,skarnization,silicification,epidote,chloritization,and kaolinite.The genesis type of the deposit is a medium high temperature hydrothermal skarn type superimposed genesis deposit,with four major prospecting indicators.