河南前河金矿岩石矿物特征

Rock and mineral characteristics of Qianhe gold deposit in Henan

前河金矿属构造蚀变岩型。容矿岩石为正长斑岩,矿体大小不等,控矿破碎带内的岩石曾经受到早期塑性变形和晚期脆性变形两个阶段。容矿岩石及矿体围岩曾受多次热液蚀变作用,可分为三个成矿期:岩浆热液期、表生期和沉积期。岩浆热液期为最主要的成矿期,由四个矿化阶段组成。一种富铁黄铜矿在金矿石中广泛存在,可作为金矿石的指示矿物。

The Qianhe gold deposit belongs to structural altered rock type deposit. The host rock is feldspar porphyry. The size of the orebodies varies and rock inside the host structure has been undergone two stages deformation： the initial plastic transformation and later brittle transformation. The host rock had been altered thermally several times. There are three matellogenic periods： magma intrusive-thermal alteration, surface oxidizing activity and sedimentation. The magma intrusive-thermal alteration is the main endogenetic period, which is composed of four mineralization stages. A chalcopyrite rich in iron can be regarded as an indicator mineral for gold ore as it is widespread in the ore.