热液脉型铅-锌-银矿床富铁闪锌矿中硫化物包裹体成因探讨

通过对热液脉型的铅－锌－银矿床（３个）和银矿床（１个）和闪锌矿中硫化物包囊体的特征研究表明，石英－硫化物阶段富铁闪锌矿（主矿物）的硫化物包裹体十分发育：沿生长带产出的乳滴状黄铜矿与主矿物为共同沉淀成因；沿穿切主矿物的黄铜矿或石英细脉两侧，和受粗粒黄铜矿溶蚀的富铁闪锌矿近接触部位发育的乳滴状黄铜矿为渗透－交代产物；沿解理（裂隙）或粒间、粒内产出的各种形态磁黄铁矿是充填－交代的结果；沿解理分布的脉状毒

Genesis of sulfide inclusions in iron-rich sphalerite from hydrothermal vein-type lead-zinc-silver deposits

Sphalerite from Pb Zn deposits of various genetic types often contains sulfide inclusions that occur in different forms of intergrowths.The study of the genesis of sulfide inclusions is of great significance to the understanding of the crystallization sequence of ore minerals and the ore forming process.According to the features of sulfide inclusions in sphalerite and the electron microprobe analyses of sphalerites near inclusions from three hydrothermal vein type Pb Zn Ag deposits(Caijiaying,Sandaogou and Qingda)and one Ag deposit(Xiazhai),the author comes to the conclusion that iron rich sphalerite(host mineral)has a large number of sulfide inclusions:the emulsion drop like chalcopyrites densely existent along the growth zones of host minerals were formed by coprecipitation of chalcopyrite and iron rich sphalerite,while the coarser chalcopyrite inclusions in the emulsion drop like chalcopyrites are recrystallization products.The emulsion drop like chalcopyrites along both sides of chalcopyrite or quartz veinlets cutting host minerals and those near the contact of iron rich sphalerite corroded by coarse chalcopyrite are considered to be products of permeation and replacemlent by cupreous solution.A great variety of pyrrhotites distributed in cleavages(cracks),intergrains or grains of host minerals were formed by filling metasomatism.Arsenopyrite veinlets in cleavages of host minerals belong to filling replacement product.The lamellar or emulsion drop like chalcopyrites and pyrrhotite laths distributed in cleavages of host minerals resulted from filling metasomatism of the solution that contained the two sorts of mineral components,and when pyrrhotite and chalcopyrite coexisted in the same lath like inclusion,the former was corroded by chacopyrite.At the same time,the varieties of sulfide inclusions of iron rich sphalerite are intimately related to ore mineral assemblages of the studied ore deposits.