Abstract—

Pyrite ores on the flanks of the Saum copper–zinc massive sulfide deposit are clastic sediments intensely transformed under conditions of acid diagenesis. Colusite in ores is confined to fine-grained pyrite clasts, which are rimmed by later small-crystalline pyrite aggregates. Colusite forms fine dissemination (1–3 µm) and large isometric grains (up to 50–100 µm), contains inclusions of sulvanite, and belongs to arsenocolusite in chemical compositions (wt %): 12.62–14.87 As, 0.19–0.64 Sb, 0.29–1.46 Sn, 3.05–3.23 V, and 1.51–3.20 Fe. The LA ICP MS analysis of fine-grained pyrite revealed minor Ga, Ge, In, and Se contents in composition of arsenocolusite, which are correlated with chemical elements of colusite according to isomorphous substitutions in its formula. Galena, tellurobismuthite, native gold, molybdenite, rutile, monazite, uraninite, and Ba-bearing muscovite are found in fine-grained pyrite in assemblage with colusite. Interaction of sulfide sediments with seawater led to their enrichment in seawater elements (V, Mo, and U) and the deposition of colusite in assemblage with molybdenite and uraninite from trace element-rich diagenetic fluids under their dehydration.

中文翻译：

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北乌拉尔桑姆铜锌大规模硫化物矿床硫铁矿中的砷锰矿

摘要—

Saum铜锌块状硫化物矿床侧面的硫铁矿是在酸性成岩作用下强烈转化的碎屑沉积物。矿石中的软锰矿仅限于细粒的黄铁矿碎屑，这些碎屑被后来的小晶体黄铁矿聚集体所包围。天青石形成良好的散布（1-3 µm）和等长的大晶粒（最大50-100 µm），包含亚硫酸盐夹杂物，并且在化学成分（重量％）中属于毒砂锰矿：12.62–14.87 As，0.19–0.64 Sb， 0.29–1.46 Sn，3.05–3.23 V和1.51–3.20 Fe。细粒黄铁矿的LA ICP MS分析表明，毒砷铝矾石成分中的Ga，Ge，In和Se含量较低，根据其配方中的同构取代形式，它们与褐铁矿的化学元素相关。方铅矿，碲锌锰矿，原生金，辉钼矿，金红石，独居石，铀矿，细粒黄铁矿与辉石矿结合时发现了含Ba和白云母。硫化物沉积物与海水的相互作用导致其富含海水元素（V，Mo和U），并且在脱水后富集微量元素的成岩流体中的辉钼矿与辉钼矿和尿素岩组合沉积。