西天山卡特巴阿苏金铜矿区成矿元素分布及其勘查意义

Element distribution of Katebasu gold-copper deposit in West Tianshan Mountains and its exploration significance

卡特巴阿苏金铜矿床是近年在西天山新发现的大型金铜矿床,资源储量有望继续扩大,后续勘探方向亟待明确。文章对矿区地表11条探槽和主矿段已完成的108个钻孔中金、铜品位进行了统计分析。研究结果表明,金铜成矿受构造断裂控制,沿断裂破碎带走向自西向东,成矿元素在平面和纵剖面中均显示Cu-Au→Au-Cu→Au(Cu)→Au的变化特征,暗示成矿流体自南西流向北东,成矿热源可能位于矿区63~47勘探线之间;在47勘探线剖面中,成矿元素自下而上显示Au-Cu→Au(Cu)→Au的变化特征,暗示成矿流体来自深部。结合在矿区63~47勘探线之间发现的与成矿有关的闪长岩小岩体,以及大比例尺勘查地球化学测量所反映的矿区自南西至北东具有W-CuAu→Au-Cu-Bi-Mo→Au(Cu)-Pb-Zn→Au-Ag的元素分布特征,认为矿区成矿中心可能在63~47勘探线之间,成矿流体由此沿断裂构造向北东方向迁移,后续正确的地质勘查方向应在63~47勘探线间的深部。

The Katebasu large-sized gold-copper deposit was discovered recently in West Tianshan Mountains. Its reserves are expected to further expand, and the follow-up exploration urgently needs clear direction. An analysis of copper grade statistics from 108 drill holes of chief ore block shows that gold and copper mineralization is controlled by the fracture. From west to east along the fracture, ore-forming elements in the plane and the vertical profile show variation of Cu-Au→Au-Cu→Au （Cu）→Au, which indicates that ore-forming fluid migrated from southwest to northeast, and the center of mineralization may be located between No.63 to No.47 exploration line. Along the exploration line profile, ore-forming elements show upward variation of Au-Cu→Au（Cu）→Au, suggesting that ore-forming fluids were derived from the depth. According to the discovery of the diorite intrusion related to the mineralization along No.63-No.47 exploration line of the deposit and large-scale geochemical exploration measurements, it is held that the ore deposit shows northeastward variation of W-Cu-Au→Au-Cu-Bi-Mo→ Au（Cu）-Pb-Zn→Au-Ag in element distribution. The authors thus consider that metallogenic thermal center may be between No.63 and No.47 exploration line, that ore-forming fluids were transported from southwest to northeast along the fault, and that follow-up geological exploration should be focused on the depth between No.63 and No.47 exploration line.