广西佛子冲铅锌矿田两种矿石类型及其成因意义

佛子冲矿田有两种不同的矿石类型，其矿物组成，结构造及赋存的矿体形态，产状都明显不同，其中一类矿石产于层状，似层状矿体中，矿石矿物组成较简单，标型矿物为浅色闪锌矿和具细晶，微晶结构的透辉石，矿石中发育典型的同生沉积组构，推断为同沉积期热水沉积成矿作用的产物，称为热水沉积型矿石，另一类矿石产于脉状，简柱状，透镜状及似层状矿体中，在岩体接触带，断裂构造与层状，似层状矿体复合部位发育，矿石矿物相对复杂，标型矿物为铁闪锌矿和钙铁辉石，该类矿石穿切或叠生于热水沉积型矿石之上，矿石结构构造反映后生成因特征，称为叠生改造型矿石，两类矿石标型矿物的化学成分和流体包裹体包裹体成分有明显差异，指示了不同的形成环境，成矿过程可划分出两个成矿期，即早志留世热水沉积成矿期和燕山期岩浆－热液叠生改造成矿期。

Two kinds of ore and their genesis in Fozichong lead-zinc orefield,Guangxi

Two kinds of ore have been identified in Fozichong orefield. The first ore type emerges in bedded orebodies.The ore's mineral component is simple,leucoratic sphalerite and diopsite are the guide minerals of the ore. Typical syngenetic sedimentary structure, which is called as hot-water sedimentary ore. The which have stable thickness and its main association of minerals are leucocratic sphalerite-galenite-diopsite (epidot, chlorite). There are laminated structure,soft sedimentary-slipping deformed structure, syngenetic brecciated structure in the ore which are the mirror of syngenetic sedimentation. The other type of ore has the charactristic of epigenetic mineralization,which is called as telescoped ore. The ore occurs in vein, pocket, lensoid and beded. The ore minerals are mainly composed of marmatite, galenit, pyrrhotite(pyrite), chalcopyrite, or marmatite, galenite, pyrite and hedenbergite. Marmatite and hedenbergite are the indicated minerals of the ore. The main ore structure include massive?vein?drusy structure, etc. The second type ore penetrates last type ore in some areas. Therefore, two mineralizalion periods ore divided, which can be called as hot-water sedimention period and telescoping period.