新疆西天山新发现新源县卡特巴阿苏大型金铜矿床

乌兹别克斯坦-吉尔吉斯斯坦中天山不乏世界级金铜矿床，新疆西部中天山及其南北缘是值得高度关注的金铜找矿方向。最近，新疆地质矿产勘查开发局第一区域地质调查大队在新疆西天山新发现新源县卡特巴阿苏大型金铜矿床。矿床位于新源县城南东直线距离30km处，产在新疆西部中天山北缘，矿体主体形成于石炭纪二长花岗岩热液蚀变体内，呈板状和透镜状，长度几米到几千米，厚度几米到几十米，上部以金矿体为主，下部铜矿体增多。矿石中黄铁矿和黄铜矿可能是主要的载金矿物，矿石平均品位金 3.84g/t、铜 0.65%。金铜成矿作用受控于二长花岗岩等岩体侵入期后热液蚀变过程。矿床的发现具有重要的经济价值，同时证实新疆西部中天山及其南北缘具备金、铜矿的巨大潜力；是地质调查先行、引导商业勘探、实现找矿突破的典范。

The discovery of the Kateba'asu large Au-Cu deposit in Xinyuan County, western Tianshan, Xinjiang

World-class Au-Cu deposits are distributed along Middle Tianshan Mountains of Uzbekistan and Kyrgyzstan. Special attention should be paid to Au-Cu prospecting in China's Middle Tianshan and its northern and southern edges. Recently, a large Au-Cu deposit of Kateba'asu in Xinyuan County of Xinjiang was discovered by No.1 Geological Survey Party of Xinjiang Bureau of Geology and Mineral Exploration and Mining. The Kateba'asu Au-Cu deposit is located on the northern margin of the Middle Tianshan Mountains of Xinjiang, ~30km southeast of Xinyuan County. Gold-copper mineralization mainly occurs in the alteration zone of Carboniferous monzonitic granite intrusion. Au-Cu ore bodies are a few to several thousand meters long and several to dozens of meters thick, assume tabular and lenticular forms, and have average grades of gold 3.84g/t and copper 0.65%. The ore bodies in the upper part are mainly associated with gold mineralization and copper mineralization which increases with the depth. Ore minerals include pyrite and chalcopyrite, which are probably the main gold-bearing minerals. Gold-copper mineralization was closely related to the hydrothermal process after the emplacement of granite intrusions (e.g., monzonitic granite, alkali-feldspar granite, granodiorite). The Kateba'asu Au-Cu deposit possesses great economic value and also indicates the existence of high prospecting potential in the Middle Tianshan Mountains of west Xinjiang. The discovery of the Kateba'asu large Au-Cu deposit gives us an example of the new prospecting model, in which geological survey goes ahead and then guides the commercial exploration, thus finally realizing important breakthrough.