九嶷山—姑婆山地区铅锌矿成矿环境分析及找矿思路

THE METALLOGENIC ENVIRONMENTS ANALYSIS AND PROSPECTING IDEA OF THE Pb-Zn DEPOSIT IN JIUYISHAN-GUPOSHAN AREA

通过对九嶷山—姑婆山地区铅锌矿床成矿环境分析,认为加里东运动形成的EW向构造及NE,NW向基底断裂控制着该区的沉积相变化。地层中铅锌物质主要来源于古隆起的蚀源区,中泥盆统棋子桥组为该区铅锌矿最重要的矿源层,加里东期岩体呈面状侵入,印支期岩体呈岩株状侵入,而燕山期岩体一般呈岩株或岩脉状沿NNE向断裂带或构造交汇部位产出,在岩体接触带或距岩体1～2km处形成岩浆热液型铅锌矿,在远离岩体的有利地层(岩性)部位形成沉积改造型铅锌矿。总结了两类铅锌矿的找矿标志,提出了"三带一点"的找矿远景区,强调运用综合方法找矿。

According to analysis for metallogenic environment in JiuyishanGuposhan it is thought that the distribution of sedimentary facies in the area has been controlled by the EWtrending structure formed in Caledonian movement and the NENWtrending foundational fracture activity. PbZn in the strata mainly derived from the old uplifted terrigenous area.Qiziqiao formation of middle Devonian epoch is the most important layer of source bed. The magma body in Cabedonian period occur in areal intrusion, and the magma body in IndoChina period in apophysis, stock, the magma body in Yanshanian period in apophysis stockdike along NNEtrending fracture zones or structure intersections. Magma hydrothermal PbZn deposit was formed in contact zone or 1~2 km away from rock body .Sedimentarymodification type PbZn deposit was formed further away from rock body. The paper summarizes the effective prospecting marks of two type PbZn deposits,and puts out minergenic prospect of 'three zoneone point', and emphsizes that synthetical prospecting must be used ,and there is definite guide significance to the area PbZn deposit prospecting.