内蒙古太平川钼铜矿床蚀变、地球化学异常特征及其找矿意义

大兴安岭北部额尔古纳成矿带是东北地区重要的有色、贵金属成矿带,内蒙古额尔古纳市太平川钼铜矿床位于该带满洲里—莫尔道嘎段(中段).矿区具有面状蚀变的特征,绢云母化强度总体上花岗斑岩>花岗闪长斑岩>似斑状(混合)花岗岩(或花岗闪长岩);花岗斑岩中绢云母化强度具有自上而下的强→弱→强→弱的"韵律"变化特征;从矿(化)体中心向外,具有绢云母化→碳酸盐化→绿帘石化、绿泥石化→泥化(高岭土化)的蚀变分带;矿区平面上具有Mo、Cu、Au、Ag的元素组合及由内向外Mo→Cu、Au、Ag→W的元素异常水平分带,剖面上则具有(Pb、Ag)Hg、As、→Mo、Cu、Au(Zn、Sb、Co、Ni)→W、Bi(Mn、B)元素异常垂向分带.矿区绢云母化的强度及蚀变分带特征,平面上地球化学元素组合以及水平方向、垂向上的元素地球化学异常分带,可以有效的指示矿区深部及边部找矿.

Characteristics of alteration and geochemical anomalies of Taipingchuan Mo-Cu deposit in Inner Mongolia and its significance for prospecting

Taipingchuan Mo-Cu deposit of Argun City in Inner Mongolia is located in the Manzhouli-Mordaga ore block (middle block)of Argun metallogenic belt in northern Greater Khingan Mountains,which is an important metallogenic belt of nonferrous metal and precious metal in Northeast China Region.The mining area is characterized by planar alteration.In descending order minerals such as granite porphyry,granodiorite porphyry,and porphyritic (mixed)granite (or granodiorite)show the intensity of sericitization.From top to bottom of the granite porphyry,the intensity of sericitization in granite porphyry varies "rhythmically"from strong to weak,then to strong and to weak again.From the center to the edge of the ore (mineralized) bodies,the altered zoning occurs as from sericitization to carbonatation,and to epidotization and chloritiza-tion,and then to potash feldspathization (kaolinization);an element association of Mo,Cu,Au and Ag and an outward horizontal zoning of element anomalies in the form of Mo→Cu,Au and Ag→W occur in the plane of the mining area,while a vertical zoning of element anomalies in the form of (Pb,Ag)Hg,As→Mo,Cu,Au (Zn,Sb,Co,Ni)→W,Bi (Mn,B)occurs in the section.A study of the intensity of sericitization and the char-acteristics of alteration zoning,geochemical element associationin the plane as well ashorizontal and vertical zoning of elemental geochemical anomalies on the plane and in the section could find effective indicators of ores buried in the deep part of the mining area and its peripheral area.