江苏镇江谏壁岩体特征与钼(钨)矿床类型

谏壁钼(钨)矿床是产于下扬子地台中的一类斑岩型矿床。在大陆边缘活动带中，陆壳碰撞、俯冲，形成了壳幔混源型中酸性、钙碱性杂岩体，为中—浅成相。岩石的演化、分异于岩浆的晚期产生了各类中酸性斑岩脉体，沿主岩体的碎裂岩化带产出。区内成矿物质主要来源于岩浆，可能有部分的围岩有益组分的加入。成矿温度、压力为中—低温和低压。矿化作用主要为热液充填作用，与石英脉带紧密相关。矿石类型为细脉状、网脉状、细脉浸染状等。矿体围岩蚀变不具有“环带模式”。因此，矿床属斑岩—石英脉型热液充填—交代钼(钨)矿床。与斑岩型(铜)矿床相比仍有一定的差异，而与钨、钼一类矿床相近。

Features of Jianbi Rock Mass and Type of Molybdenum(Wolframium) Deposits, in Zhenjiang, Jiangsu Province

Located in lower Yangtze platform, Jianbi molybdenum(wolframium) deposit belongs to a porphyry ore deposit. The collision and subduction of continental crust formed an intermediate acidic and calc-alkaline complex mass as a medium-hypabyssal facies with crust-mantle mixed source type in the mobile belt of continental margin. All sorts of intermediate acidic porphyry veins are produced by the evolution and differentiation of rocks during the late magma mass. They are distributed along the catalastic rock belt of major rock mass. The metallogenetic substances in the area are originated from the magma and useful components from some well rocks can be joined in the substances. The mineralization linked with quartz veins is constituted of low-to-moderate temperature and low pressure as well as hydrothermal infilling process. The ore types are thread vein, net-veined, veinlet-disseminated and so on. There exists on zoning model in the well-rock alteration of orebody. So, Jianbi deposit belongs to a molybdenum(wolframium) deposit of porphyry infilled by quartz vein hydrothermal solution-replacement. Compared with Porphyritic copper deposit, the deposit has a certain difference and it is similar to wolframium or molybdenum deposits.