新疆库木库里盆地铜矿地质特征及找矿前景

新疆库木库里盆地砂砾岩型铜矿带位于东昆仑成矿带西段东昆中断裂北侧新生代陆相盆地中 ,与西部且末县嘎其哥洛德和克孜勒小型砂砾岩型铜矿组成近2 0 0km长的大型砂砾岩型铜矿化带。铜矿化赋存于石马沟组上段 (E3 S1)砂岩中。围岩中铜含量一般低于地壳丰度值 ,南部火箭山地区发现有斑岩型铜矿化、昆中结合带也发现规模巨大的铜矿化带 ,它们可能是本区铜矿化的矿源层。铜矿化呈透镜状、似层状 ,剖面上已发现三层铜矿化 ,其中上部铜矿化较好。地表氧化矿石矿物组合简单 ;矿石构造为条带状、浸染状、团块状 ,填隙结构。铜矿化受湖泊三角洲相、三角洲前缘亚相的近岸砂坝、远岸砂坝的砂体控制。

GEOLOGICAL FEATURES AND PROSPECTING POTENTIAL OF COPPER ORES IN THE KUMUKULI BASIN, SINKIAND

The sandy gravel copper ore zone in the Kumukuli basin of Sinkiang is located in the Cenozoic continental basin at the north side of the western part of the eastern Kunlun mineralized zones. It composes of a large scale sandy gravel copper mineralized zone, 200km long, with the small sized copper ores in Geqigeluode and Kecile in Qiemo County at the west part. The copper mineralization occurs in sandstone of the upper portion (E 3S 1) of the Shimagou Formation. The copper content in wallrocks are generally lower than that of the crustal abundance ratio. The porpheric copper mineralization found in the Huojianshan area at the south and a large scaled copper mineralization discovered in the Kunzhong junction are very possible to be the source beds of copper mineralization in this area. The copper mineralization appearing in lens shaped and stratified has been found to be three layers at the profiles and the copper mineralization is better in upper portion. The composition of oxide ores on the surface is simple. The textures of ores are common in banded, disseminated, massive and interstitial structures. The copper mineralization is controlled by inshore sandbar and infralittoral sandbar of lacustrine delta facies and delta frontal sub facies.