新疆东戈壁斑岩型钼矿床脉体特征

新疆东戈壁斑岩型钼矿床规模达特大型,该矿床具有独特的地质特征,矿体不是产于斑岩体的内外接触带,而是产于斑岩体100～200 m外侧围岩脉体中。矿化主要富集于各种脉体中,石英脉、钾长石脉是最常见、分布数量最多的脉体,此外还有方解石-石英脉、萤石-石英脉及方解石-萤石-石英脉、萤石-钾长石脉等成份复杂、规模不等的脉体,脉体外围岩中基本无矿化。不同成份的脉体其矿化种类、强弱有较大差异,本文重点研究了矿化脉体的分类、脉体与不同成分的金属矿物矿化之间的对应关系及脉体之间的交切系等特征。通过脉体特征能从一个方面了解与岩浆热液成矿作用有关的热液成份的复杂组合,为再塑成矿作用过程、更好地指导区域找矿工作提供新的思路。

THE CHARACTERISTIC OF VEINS IN THE EAST GOBI PORPHYRY-TYPE MOLYBDENUM DEPOSIT IN XINJIANG PROVINCE

The East Gobi Mo deposit in Xinjiang province is a super large ore deposit, and it has the particular geo- logical characteristic, the orebody is not situated in the internal and external contact zones, but situated in the veins in wall rock 100 - 200 m outside the porphyry body. The mineralization is concentrated in various kinds veins. Quartz and potassium feldspar veins are the most common and enjoy the largest distribution, furthermore complex ingredients and different scales veins like calcite quartz vein, fluorite quartz vein, calcite - fluorite - quartz vein, fluorite - potassium feldspar vein etc. The wall rock outside the veins mostly have no mineralization. Different ingredients veins have bigger differences in mineralization types and strength. The paper focuses in researching the characteristic in classification of mineralization veins, the correlation berween veins and metal minerals with different ingredients, and the cut relationship between different veins. Through the characteristic of veins we can understand the combinatorial complexity of hydrothermal ingredients which related to magmatic hydrothermal action, and then reconstructed the mineralization process and provide a new approach for region geological prospecting work.