二棚甸子-宽甸万宝一带铜钼矿成矿地质特征

Geological characteristics of copper and molybdenum mineralization in area of Erpengdianzi—Wanbao in Kuandian

为研究二棚甸子-宽甸万宝一带铜钼矿成矿的地质特征,对这一成矿带铜钼矿所处的区域地质背景,矿区、矿体地质特征等进行论述,分析总结矿体的成矿条件,探究岩浆活动、构造运动及围岩蚀变与铜钼矿体成因之间的关系.结果表明:铜矿体多产于岩体内部或接触带附近,钼矿体主要赋存在花岗闪长岩岩体内,刘家沟、昌邑沟钼矿体赋存于花岗斑岩或石英斑岩围岩,滚立岔则是一条燕山期侵入的花岗闪长岩与古生界地层所形成的含铜多金属矽卡岩带;断裂构造多具控岩控矿作用,为成矿提供元素的运移通道,断裂交汇处是储矿的有利部位;围岩总体上具有硅化、钾化、伊利石—水云母化、黄铁绢英岩化等.

In order to research the geological characteristics of copper and molybdenum mineralization in the area of Erpengdianzi--Wanbao in Kuandian, the paper discussed the regional geological background of this copper and molybdenum metallogenic belt, the geological characteristics of the mining area and the ore bodies, analyzed and summarized the metallogenic conditions of the ore bodies, and explored the relationship between magmatism, tectonic movement and wall rock alteration with the cause of formation of copper and molybdenum ore. The results show that the Copper ore often comes from the inner rock or occurs near the contacting zone, the Molybdenum mainly exists in granodioite, the Molybdenum in Liujiagou and Changyigou exists in granite porphyry and adjoining rock of quartz porphyry, and Gunlicha is a belt of copper-bearing polymetallic skarn forming by Yanshanian granodiorite and palaeozoic strata; the faulted structure often has an impact on controlling rock and ore, and provides the metallogenic elements＇ migration channel. The fracture interchange is the favorable ore-contained position; Wall rock alteration generally consists of silicification, potassic alteration, illite-hydromicazation and beresitization and so on.