Mineralization Characteristics of Uranium Polymetallic Deposit in Beijinqi Volcanic Basin, West Junggar
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摘要: 北金齐火山岩盆地是在华力西晚期伸展构造作用下形成的陆相火山岩盆地，切盆及环状断裂发育。铀多金属矿化亦环带状分布于盆地周边，按照含矿建造可分为：赋存于上二叠统库吉尔台组凝灰质砾岩段的铀钼矿化；赋存于下二叠统卡拉岗组熔岩段的铀铜矿化。通过对不同层位的典型矿点特征分析，认为北金齐火山岩盆地铀多金属找矿潜力较大。由于克孜勒阔腊铀钼矿点受酸性凝灰质砾岩及特定的构造位置的控制，笔者指出了2个找矿方向，首先应圈定由酸性砾石构成的含矿凝灰质砾岩带，其次注重寻找深部隐伏的酸性斑岩体及其内外接触带部位的多金属矿化部位；阿尔帕萨勒铀铜矿化点与之配套的隐爆角砾岩、蚀变分带均显示深部具备形成次火山岩型或斑岩型多金属矿化的有利条件。Abstract: The Beijinqi volcanic rock basin is a continental volcanic rock basin formed under extensional tectonic action in Late Variscan, with well development of basin-cutting and ring faults. Uranium polymetallicminimalized zone is occurred in the periphery of the basin withring distribution.According to the ore-bearing construction, the uranium mineralization can be divided into two kinds, that is, the uranium-molybdenum mineralization existed in tuffaceous conglomerate zone in Upper Permian Kujiertai Formation and the uranium-copper developed in lava zone in Lower Permian Kalagang Formation.After analyzing typical ore occurrences in different layers, it's believed that the Beijinqi volcanic rock basin has a great ore-prospecting potential in uranium polymetallic deposits. Considered to the Kezilekuola uranium-molybdenum ore occurrence controlled by acidic tuffaceous conglomerate and specific tectonic setting, two ore-prospecting directions have been pointed out in this paper. Firstly, theore-bearing tuffaceous conglomerate zone consisting of acidic gravel should be defined. Then, the polymetallic mineralization should be found in the deep concealed acidic porphyry and its internal or external contact zone.The Aerpasale uranium-copper ore occurrence and its corresponding cryptoexpiosive breccia, alteration zonation all show that its depth has advantage to form sub-volcanian type or porphyry type polymetallic mineralization.
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Keywords:
- polymetallic deposit /
- volcanic basin /
- ore-controlling factors /
- Beijinqi
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