河南汝阳竹园沟钼矿床成矿母岩类型和成矿阶段研究

RESEARCH ON TYPE OF METALLOGENIC MOTHER ROCK AND ITS MINERALIZATION STAGES OF ZHUYUANGOU MOLYBDENUM DEPOSIT

河南汝阳县竹园沟钼矿床是新近发现并探明的斑岩型钼矿床,该矿床最大特点是赋矿岩石全部为花岗岩类岩石。矿床的成矿母岩为中细粒黑云母花岗斑岩,该类岩石常具似斑状结构,说明其成岩是浅成的。根据矿床矿石内各类脉体的先后顺序及含矿性,结合矿物的共生组合关系及结构构造特征,将矿化划分为四个热液作用阶段:即①石英脉阶段;②辉钼矿—石英脉阶段;③辉钼矿—钾长石—石英脉阶段;④萤石—钾长石—石英脉阶段。结论是:第②、③两个阶段是矿床的主要成矿阶段。

Zhuyuangou molybdenum deposit is a newly discovered and proved porphyry molybdenum deposit in Ruy- ang, Henan. Its most obvious characteristic is that the ore -host rocks are all granite. The metallogenic mother rocks belong to mid - fine grained biotite granite porphyry, and this kind of rock＇ s structure is always similar to that of porphyritic rock, so it proves hypabyssal diagenesis. According to all kinds of veins＇ order and the ore - bearing potential in the deposit, and the combinative relations with mineral association and structure features, min- eralization is divided into four hydrothermal process stages ： （ 1 ） the quartz vein stage ; （2） the molybdenite - quartz vein stage; （3） molybdenite -potassium feldspar- quartz vein stage; （4） the fluorite -potassium feldspar -quartz vein stage. The conclusion is： （2）and （3） are the main mineralization sta^es of the deposit.