再论大兴安岭中东部六九山铜矿床成矿地质特征、成因与成矿地质背景  

A re-evaluation on the deposit geological features,genesis and metallogenic geological setting of Liujiushan Cu deposit in the central-eastern segment of the Greater Xing an Range

作　　者：宫永吉 孙景贵[2] 刘阳[2] GONG Yong-ji;SUN Jing-gui;LIU Yang(Heilongjiang Six Nine Mining Co.Ltd.,Qiqihar 161100,Heilongjiang,China;College of Earth Science,Jilin University,Changchun 130061,Jilin,China)

机构地区：[1]黑龙江陆玖矿业有限公司,黑龙江齐齐哈尔161100 [2]吉林大学地球科学学院,吉林长春130061

出　　处：《吉林地质》2020年第4期1-10,共10页Jilin Geology

基　　金：国家自然科学基金(41390444);科技部国家重点研发计划课题(2017YFC0601306)共同资助。

摘　　要：六九山铜矿床产在大兴安岭中东部的突泉—龙江—岔路口斑岩-浅成热液Cu (Mo)-Pb-Zn成矿带中部,发育在中生代花岗闪长岩体与叠加之上的光华组酸性火山岩体系的NWW向断裂中。矿体呈椭圆似穹隆状,长轴近东西走向,矿体处于海拔-80^+300 m之间。矿体工业类型为角砾岩型,主要由隐爆热液胶结角砾岩和次要的热液充填角砾岩和网脉状热液充填震裂(碎)岩组成。原生围岩蚀变从早到晚依次发生强弱不同的钾长石-黑云母化→青磐岩化→泥化→绢英岩化→早阶段灰白色硅化(面状)→成矿阶段灰白色硅化(充填状)→晚阶段白色硅化(梳状+晶洞状+晶簇)→萤石+石膏(浸染状+晶洞+细脉状)→碳酸盐化。原生矿化依次是黄铁矿+辉钼矿→黄铁矿+黄铜矿→黄铜矿+闪锌矿。成矿过程经历乳白色脉状黄铁矿+石英±黄铜矿阶段、胶结状石英+黄铁矿+黄铜矿阶段、细脉+晶洞状石英+黄铁矿阶段和浸染+细脉状萤石+石膏阶段。将其与典型矿床成矿特征对比、并结合区域成岩成矿年代学研究成果,认为该矿床应是浅成热液高硫化型铜矿床。成矿作用适值早白垩世库拉板块向欧亚大陆俯冲的大陆边缘火山弧环境。Liujiushan copper deposit is located in the center of Butuquan-Longjiang-Chalukou porphyry-epithermal Cu(Mo)-Pb-Zn belt at the central-eastern segment of the Greater Xing an Range region,and is hosted by the NWW-trending faults in the Mesozoic granodiorite stocks and overlying felsic volcanic rocks.The ore veins are ellipsoidal and dome-like with an E-W axis.These veins are restricted at the elevations between-80 m and+300 m.The industrial type of the ore body is breccia type,which is mainly composed of cryptoexplosive hydrothermal cemented breccia,secondary hydrothermal filling breccia and reticular vein hydrothermal filling fracturing(clastic)rock.The alteration types with time are from K-feldspar biotitization→propylitization→argillization→sericitization→early stage grayish white silicification(faceted)→mineralization stage gray white silicification(filling type),late stage white silicification(comb+miarolitic+crystal druse)→fluorite+gypsum(disseminated+crystalloid+veinlet)→carbonation.The primary mineralization is pyrite+molybdenite→pyrite+chalcopyrite→chalcopyrite+sphalerite.The mineralization process experienced opalescent veined pyrite+quartz±chalcopyrite,cemented quartz+pyrite+chalcopyrite stage,veinlet+crystalloid quartz+pyrite stage and disseminated+veinlet fluorite+gypsum stage.In comparison with other typical deposits,and combination with the research results of regional diagenetic and metallogenic geochronology,it is considered that the deposit should be a typical high sulfide epithermal copper deposit,and the mineralization occurred in the volcanic arc environment of continental margin when the Early Cretaceous Kula oceanic slab subducted to the Eurasia continent.

关 键 词：成矿地质特征 矿床成因 成矿地质背景 六九山铜矿床 大兴安岭中东部 

分 类 号：P618.41[天文地球—矿床学]