| 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 |
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| 引用本文：.1999.Genesis of sulfide inclusions in iron-rich sphalerite from hydrothermal vein-type lead-zinc-silver deposits[J].Mineral Deposits,18(3):244~252 |
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| 基金项目:“九五”国家重点科研项目 |
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| 中文摘要:通过对热液脉型的铅-锌-银矿床（3个）和银矿床（1个）的闪锌矿中硫化物包裹体的特征研究表明，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肯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砂属充填-交代成因；沿解理产出的晶片状或乳滴状黄铜矿和板条状磁黄铁矿，是含这两种矿物成分溶液充填-交代所为，而在含有磁黄铁矿和黄铜矿的同一板条状包裹体中，黄铜矿溶蚀磁黄铁矿。这为查明矿物生成顺序和揭示成矿作用过程具有重要指示意义。 |
| 中文关键词:铅-锌-银-矿床 富铁闪锌矿 硫化物包裹体特征 成因探讨 |
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| Genesis of sulfide inclusions in iron-rich sphalerite from hydrothermal vein-type lead-zinc-silver deposits |
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| Abstract: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 sphalcrite (host mineral) has a large number of sulfide inclusions: the emulsion drop-like chalcopyrites densely existent along the growth zones or host minerals were formed by coprecipitation of chakopyrite and iron-rich sphalerite, while the coarser chalcopyrite inclusions in the eimulsion drop-like chalcopyrites are recrysiallization 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 replacement 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-metahomatism of the solution that containcd 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 su1fide inclusions of ironrich sphalerite are intimately related to ore mineral assemblages of the studied ore deposits. |
| keywords:Pb-Zn-Ag deposit, iron-rich sphalerite, features of sulfide inclusions, genesis |
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