Low-sulfide platinum group element (PGE) mineralization of the Norilsk-type intrusions is located within the Upper Gabbroic Series, which comprises rocks heterogeneous in texture and composition. The highest grade of 10 to 50 g/t PGEs is confined primarily to chromitiferous taxitic gabbrodolerite, which forms irregular lens- and vein-like bodies that interfinger with contact gabbrodolerite, intrusion breccia, leucogabbro, and gabbrodolerite variably enriched in olivine, from olivine free up to picritic compositions. The abundant amygdules and pegmatoidal textures in Upper Gabbroic Series taxitic rocks, as well as the high enrichment of halogen in minerals (e.g., ≤4.6 wt % Cl in apatite), indicate a higher volatile content of the local magma compared to the magma that precipitated the Main Series. The observed diversity in spinel compositions, which evolve from chromite to Cr magnetite as well as toward hercynite, titanomagnetite, and ulvöspinel, is also indicative of crystallization from a fluid-saturated mush that subsequently reacted, to varying degrees, with contaminated trapped melt and immiscible fluid.The high PGE/S ratio is a primary feature of this mineralization style, albeit the ratio partly increased during sulfide replacement and resorption. The PGE tenor of bulk sulfides calculated as ΣPGE (g/t) in 100% sulfides exceeds 160 and may reach up to 1,400 to 2,500 in low-S ores (0.2–3 wt % S), whereas the value does not exceed 42 in the Talnakh disseminated ore and ranges from 35 to 120 in the Norilsk disseminated ore (1–10 wt % S). Several PGE peaks in the vertical sections correlate well with Cu, Ni, S, and Cr peaks, as well as with observed elevated proportion of amygdules. Low-sulfide ores are composed of two primary sulfide assemblages of pyrrhotite + pentlandite + chalcopyrite and pentlandite + pyrrhotite. The primary sulfides are depleted in the heavier ³⁴S isotope relative to sulfides of the corresponded main orebodies (e.g., mean δ³⁴S = 8.9‰ versus δ³⁴S = 12.3‰, respectively, in the Kharaelakh intrusion). A secondary pyrite + millerite + chalcopyrite assemblage has isotope composition enriched in ³⁴S by 2 to 6‰ δ³⁴S with respect to primary sulfides. The directly measured PGE content in sulfides (e.g., 11–2,274 g/t Pd in pentlandite and 0.10–33.3 g/t Rh in pyrrhotite) is within the range of the typical Norilsk-type magmatic sulfide compositions. The textural setting and diversity of platinum group minerals (PGMs) favor the hypothesis of fluid-controlled crystallization. However, the distinct PGM assemblages in Norilsk 1 and Talnakh-Kharaelakh low-sulfide ores are comparable with those of the corresponding presumably magmatic disseminated and massive orebodies. The most remarkable characteristic is the widespread Pt-Fe alloys in Norilsk 1 and their absence in Talnakh-Kharaelakh, which is interpreted to reflect better preservation of the high-temperature PGMs in Norilsk 1 in contrast to their substantial replacement in more oxidized fluid-enriched environments in Talnakh-Kharaelakh.

中文翻译：

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诺里尔斯克-塔尔纳赫营地的低硫铂族元素矿石

诺里尔斯克型侵入体的低硫化物铂族元素（PGE）矿化位于上高布罗布纪系列内，该组由质地和组成各异的岩石组成。最高等级的10至50 g / t PGE主要限于发色的盐生辉石辉闪石，它形成不规则的晶状和脉状体，与指辉闪石，侵入角砾岩，白垩纪和辉绿辉石（互不相同地富含橄榄石）相互指交直到野餐的成分。上盖布布纪系列滑石岩中丰富的杏仁核和类柱状纹理，以及矿物中卤素的高度富集（例如磷灰石中≤4.6 wt％Cl），表明本地岩浆的挥发性含量高于沉淀岩浆。主要系列。尖晶石成分的多样性 从铬铁矿到Cr磁铁矿以及向锂铁矿，钛磁铁矿和ulvöspinel演化，也表明从饱和流体形成的糊状结晶，随后与受污染的熔体和不混溶流体发生不同程度的反应.PGE / S高该比率是这种矿化方式的主要特征，尽管该比率在硫化物置换和吸收过程中部分增加。在100％硫化物中，以ΣPGE（g / t）计算的大块硫化物的PGE期限超过160，在低硫矿石（0.2-3 wt％S）中可能达到1400至2500，而在S中不超过42。塔尔纳克（Talnakh）散布的矿石，诺里尔斯克（Norilsk）散布的矿石（1-10 wt％S）介于35至120。垂直截面中的几个PGE峰与Cu，Ni，S和Cr峰以及观察到的扁桃体比例升高密切相关。低硫矿石由黄铁矿+绿铁矿+黄铜矿和绿铁矿+黄铁矿的两种主要硫化物组合组成。初级硫化物消耗较重^34个硫同位素相对于硫化物对应主矿体（例如，平均δ ³⁴ S = 8.9‰与δ ³⁴ S = 12.3‰，分别在Kharaelakh侵入）。一种二次黄铁矿+米勒尔+黄铜矿组合有富含同位素组合物³⁴由2至6‰δ小号³⁴关于伯硫化物的S。硫化物中直接测量的PGE含量（例如，在五氧化二锰中为11–2,274 g / t Pd，在黄铁矿中为0.10–33.3 g / t Rh）在典型的Norilsk型岩浆硫化物组成范围内。铂族矿物（PGM）的组织结构和多样性有利于流体控制结晶的假设。但是，在Norilsk 1和Talnakh-Kharaelakh低硫化物矿石中，独特的PGM组合与相应的岩浆散布和大量矿体的PGM组合具有可比性。最显着的特征是在Norilsk 1中广泛使用的Pt-Fe合金，而在Talnakh-Kharaelakh中则不存在，