| 阿克阔依金矿化带地质特征及其含金石英脉成因 |
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| 引用本文：.1993.Geology of the Akekuoyi gold mineralization belt and genesis of its auriferous quartz veins[J].Mineral Deposits,12(2):129~137 |
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| 中文摘要:西准噶尔阿克阔依金矿化带内已发现30余个金矿点或矿化点，为石英脉型矿脉，其分布受NEE和EW向裂隙控制，在矿脉走向和倾向上均呈平行排列和成群出现。它们与海西晚期花岗岩有密切成因关系。含金矿物为自然金和银黝铜矿．经石英气液包裹体测试表明：金矿化主要温度170～310℃。矿化条件为还原和酸性环境。成矿物质从花岗岩岩浆热液析出和围岩中萃取。岩浆热液与天水，形成混合的、富挥发分及成矿元素的成矿热液。 |
| 中文关键词:花岗岩岩浆 石英脉型矿脉 低-中温热液矿床 成矿地球化学条件 |
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| Geology of the Akekuoyi gold mineralization belt and genesis of its auriferous quartz veins |
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| Abstract:Lying on the western margin of the Junggar basin, the Akekuoyi gold mineralization belt is located between the Mayile fault and the Dalabut fault of the Hercynian folded belt, being the westward extension of the Anqi-Hatu metallogenic belt. The mineralization belt is mainly controlled by the east-west and NE-trending major faults. and the ore-bearing quartz veins are hosted by the second-order faults adjacent to the major faults. The host rock of the auriferolls quartz veins are tuffaceous siltstone—fine-grained sandstone and tuffaceous medium and coarse-grained sandstone of the Lower Carboniferous Baogutu Formation and Xibeikulas Formation. As their gold abundance is higher than the clarke value of gold in the crust, these rocks made up a favorable material prerequisite for metallogenesis. In addition, Hercynian granltes are well developed in this region, which also provided sufficient energy and ore substances for the formation of gold deposits．In the mineralization belt some 30 km in length and 1～2 km in width, more than 30 ore occurrences have been found. Mineral composition of the ore is quite simple, dominated by the quartz vein type. Three ore-forming stages can be recognized, i. e., the quartz-sulfide stage. The quartz-narive gold-freibergite stage and the quartz-carbonate stage. Geochemical characteristics of the mineralization belt suggest that the ore-forming fluids are mixture of late hydrothermal solution produced by evolution of granitic magma with underground water. From the above discussion it is considered that the gold deposits in this mineralization belt are mesothermal-epithermal deposits. |
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