青海格尔木开木棋拉仁-长梁山地区铜多金属矿地质特征与成矿规律简析

Simple Analysis of Geological Features and Metallogenetic Regularities of Cu-Polymetallic Deposits in the Kaimuqilaren-Changliangshan Region, Golmud, Qinghai

研究区位于柴达木准地台之南缘,大地构造位置属秦祁昆造山系之东昆仑弧盆系,区内出露地层较少,断层与褶皱均较为发育,根据区内铜矿化特征,铜矿主要发现在黑色泥板岩和细砂质千枚岩、细粒变砂岩中,两者铜矿(化)都具有明显层控特征,符合火山沉积型铜矿的成矿模式。本文对青海格尔木开木棋拉仁-长梁山地区铜多金属矿地层、构造特征与地区成矿规律进行系统分析,主要地球化学数据异常包含W、Sn、Mo、Ti、Cr、Ni、Au、Ag、Hg等,异常分布受成矿地质条件控制,且具有典型空间分布特征,其主要矿物为自然铜和表生氧化产物黑铜矿、赤铜矿及孔雀石,故认为该铜矿成矿类型为变质砂岩型。根据火山沉积型铜矿的成矿模型,该类型铜矿往往形成规模较大的中大型铜矿床,区域内具有较好的铜找矿潜力。

The Kaimuqilaren-Changliangshan Region in Golmud lies in the east Kunlun lake-basin system of the Qinqikun orogenic system on the southern margin of the Qaidam metaplatform.Cu mineralization in this region occurs in black argillite,fine sandy phyllite and fine-grained metamorphic sandstone.W,Sn,Mo,Ti,Cr,Ni,Au,Ag and Hg geochemical anomalies are delineated in this region.Main Cu-bearing minerals are native copper,tenorite,cuprite and malachite.This Cu deposit belongs to metamorphic sandstone type one.This region is of good perspective for searching for copper deposit.