Abstract

Mineralogical and geochemical studies of sulfide–platinum metal assemblages of the Khudolaz complex made it possible for the first time to substantiate their polygenetic nature. Three types of sulfide assemblages were distinguished. Their formation is associated with the segregation and fractionation of a sulfide melt, subsequent replacement of primary sulfides at the early hydrothermal stage, and partial redeposition of sulfides at the late hydrothermal stage. It was established (LA-ICP-MS data) that the removal of pla-tinum group elements (PGE) occurred due to primary sulfide alteration with their partial accumulation in newly formed sulfides. The structural position of PGM grains was studied using a scanning electron microscope. Platinum-group minerals (PGM) were crystallized during three stages: (1) from residual highly fractionated sulfide melts or immiscible metalloid melts captured by sulfides; (2) during the segregation of isomorphic impurities of PGE and chalcophile elements due to the exsolution of solid sulfide solutions; (3) during the interaction of antimony-enriched fluids with alternating sulfides.

中文翻译：

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Khudolaz 复合体（南乌拉尔）硫化物和铂金属矿化的成因

摘要

对 Khudolaz 复合体的硫化物 - 铂金属组合的矿物学和地球化学研究首次使证实它们的多基因性质成为可能。区分了三种类型的硫化物组合。它们的形成与硫化物熔体的偏析和分馏、早期热液阶段初级硫化物的后续置换以及后期热液阶段硫化物的部分再沉积有关。已确定（LA-ICP-MS 数据）铂族元素 (PGE) 的去除是由于初级硫化物改变及其在新形成的硫化物中部分积累所致。使用扫描电子显微镜研究了 PGM 晶粒的结构位置。铂族矿物 (PGM) 在三个阶段结晶：(1) 来自残余的高度分馏硫化物熔体或被硫化物捕获的不混溶准金属熔体；(2)硫化物固溶体溶出PGE和亲硫元素同晶杂质偏析过程中；(3) 在富锑流体与交替硫化物相互作用期间。