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Platinum-Group Minerals in the Early Proterozoic Kuusijarvi Marginal Series, Koillismaa Layered Igneous Complex, Northeastern Finland

机译:铂族群矿物在早期的前果古代Kuusijarvi边缘系列,Koillismaa分层Igneous Complex,Northeastern Finland

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The 2.44 Ga Kuusijarvi layered intrusion in northeastern Finland hosts a 15-33 m thick platinum-group mineral (PGM)-Ni-Cu sulfide-bearing gabbro layer in the Marginal Series, which is mineralized by disseminated chalcopyrite, pyrrhotite, pentlandite and pyrite and platinum-group minerals merenskyite (62 % of the PGM), michenerite (1.3 %), kotulskite (5 %), Pd-rich bismuthian melonite (25.3%), sperrylite (6.6.%) and platinum group element (PGE)-rich cobaltite. The PGE-Cu-Ni sulfide-bearing gabbro has Cu/(Cu+Ni) of 0.53 and Pt/(Pt+Pd) of 0.29. The PGM have grain sizes of <40 urn, mostly in the range 5-15μm. The PGM occur primarily in connection with hydrosilicates between amphibole and pyroxene grains in the hosting gabbro. Partly the PGM occur at sulfide grain boundaries. On a textural basis it is concluded that the PGE-mineralization took place at a late stage in connection with the crystallization of hydrosilicates, possibly during metamorphic retrograde recrystallization at temperatures below 500°C.
机译:芬兰东北部的2.44甘毛毛河侵入侵入铂金矿物(PGM) - 耐硫化铝矿物(PGM) - 耐硫化物含Gabbro层,其通过播散的硫代铜矿,Pyrrhotite,Pentlandite和硫铁矿矿化铂 - 群矿物矿物质(PGM的62%),咪塞岩(1.3%),Kotulskite(5%),富含富含铋的铋素(25.3%),斯皮里莱(6.6。%)和铂族元素(PGE) - 粒子钴罐。 PGE-Cu-Ni硫化物轴承Gabbro具有0.53和Pt /(Pt + Pd)的Cu /(Cu + Ni)为0.29。 PGM具有<40瓮的粒度,主要在5-15μm的范围内。 PGM主要与托管Gabbro中的锥体和焦烷颗粒之间的氢化物相关。部分PGM发生在硫化物晶界。上的纹理基础得出的结论是所述PGE-矿化在温度低于500℃变质逆行再结晶期间发生在后期阶段中与氢化硅酸盐的结晶连接,可能。

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