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New Data on Platinum Group Element Bearing Chromitites from the Kurtushiba Ophiolite, Western Sayan
Geology of Ore Deposits ( IF 0.7 ) Pub Date : 2021-02-08 , DOI: 10.1134/s1075701520080140
A. N. Yurichev , A. I. Chernyshov

Abstract—Small grains of platinum group minerals (PGMs) have been found in chromitites of the Ergaksky and Kalninsky ultramafic massifs, which are marginal northeastern fragments of the Kurtushiba ophiolite belt in Western Sayan. Along with previously described PGMs, the Cu–Ru–Os solid solution, arsenic-bearing (As up to 3.6 wt %) laurite with minor Pt, Ni, and Co, platinum group element (PGE) sulfides of the MeS and Me3S4 types, sulfoarsenide with the high Rh content (12.7 wt %) in chromitites of the Ergaksky massif, and laurite and sulfoarsenides in chromitites of the Kalninsky massif were found for the first time. The PGM compositions indicate a high formation temperature of Ru–Os sulfide (1200–1250°C) in both massifs, as well as a high partial sulfur pressure during the formation of chromitites and syngenetic PGMs in the Ergaksky massif. The PGM assemblages were formed during several stages. The Os–Ir–Ru alloys and the laurite–erlichmanite series disulfides (predominantly partitioning Ru) are early; the Cu–Ru–Os alloys, sulfides (Ru,Fe)3S4, (Ru,Ni,Fe)S, and PGE sulfoarsenides are late and were crystallized under the influence of reductive fluids as a result of PGE remobilization and redeposition.



中文翻译:

西萨彦岭Kurtushiba蛇绿岩中含铂族元素白铁矿的新数据

摘要—在萨尔州西部库尔图巴蛇绿岩带的东北边缘边缘的埃尔加克斯基和卡林斯基超镁铁质岩块的铬铁矿中发现了铂族矿物(PGM)的小晶粒。连同先前描述的PGM,Cu-Ru-Os固溶体,含砷(高达3.6 wt%)的月桂酸盐和少量的Pt,Ni和Co,MeS和Me 3 S的铂族元素(PGE)硫化物4首次发现Ergaksky断块的铬铁矿中Rh含量高(12.7 wt%)的硫砷化物,以及Kalninsky断块的铬铁矿中月桂酸盐和硫代砷化物。PGM的组成表明,两个地块中Ru-Os硫化物的形成温度都很高(1200-1250°C),而Ergaksky地块中铬铁矿和同系PGM的形成过程中硫分压较高。PGM组件是在几个阶段中形成的。Os-Ir-Ru合金和月桂石-水滑石系列二硫化物(主要是Ru分配)是早期的。Cu-Ru-Os合金,硫化物(Ru,Fe)3 S 4,(Ru,Ni,Fe)S和PGE硫砷化物较晚,并且由于PGE迁移和再沉积,在还原液的作用下结晶。

更新日期:2021-02-08
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