Mineralogy of Chromitites of Mount Poklonnaya of the Karabash Massif, South Urals

IF 0.8 4区 地球科学 Q3 GEOLOGY Geology of Ore Deposits Pub Date : 2024-03-06 DOI:10.1134/s1075701523090052
V. I. Popova, E. V. Belogub, M. A. Rassomakhin, V. A. Popov, P. V. Khvorov
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Abstract

Mineral composition of chromitites and host serpentinites from a quarry at Mt. Poklonnaya of the Karabash serpentinite massif is studied using optical and electron microscopy. Along with previously known native osmium and laurite, eight minerals of platinum group elements (MPG) are found. Among them are isoferroplatinum, irarsite, iridium, naldrettite, cuproiridsite, sperrylite, tolovkite, and erlichmannite. It is found that magnesioalumochromite is an early magmatic Cr-spinel, while magnesiochromite and ferrichromite are late magmatic. The earliest native iridium and native osmium are replaced by platinum-group-elements sulfides, arsenides and stibnides. Magnesiochromite is associated with native gold, Ni chalcohenides (gersdorffite, millerite, pentlandite, heaslewoodite) and chalcopyrite. The formation of Cr-magnetite, magnetite, native iron, native nickel, galena, and barite is related to serpentinization. Carbonates (calcite and dolomite), brucite, andradite, sepiolite and an unidentified Ca-silicate formed at the latest stage of serpentinization. Secondary Ni minerals (gaspeite, nepuite, “garnierite”) are most likely products of the latest mineral-forming process.

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南乌拉尔卡拉巴赫山丘波克隆纳亚山铬铁矿矿物学
摘要 利用光学显微镜和电子显微镜研究了卡拉巴什蛇绿岩地块博克隆纳亚山采石场的铬铁矿和主蛇绿岩的矿物成分。除了之前已知的原生锇和月桂石之外,还发现了八种铂族元素(MPG)矿物。其中包括异铁铂石、铱铱石、铱、瑙铱石、铜铱石、榍石、托洛夫石和铒铱石。研究发现,镁铝铬铁矿是早期岩浆型铬黝帘石,而镁铬铁矿和铁铬铁矿则是晚期岩浆型铬黝帘石。最早的原生铱和原生锇被铂族元素硫化物、砷化物和锡化物所取代。菱镁铬铁矿与原生金、镍黄铜化物(gersdorffite、millerite、pentlandite、heaslewoodite)和黄铜矿伴生。铬磁铁矿、磁铁矿、原生铁、原生镍、方铅矿和重晶石的形成与蛇纹石化有关。碳酸盐(方解石和白云石)、青金石、安山岩、绢云母和一种不明钙硅酸盐形成于蛇纹岩化的最后期。次生镍矿物(霞石、霓辉石、"加尼耶石")很可能是最新矿物形成过程的产物。
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来源期刊
Geology of Ore Deposits
Geology of Ore Deposits 地学-地质学
CiteScore
1.10
自引率
14.30%
发文量
24
审稿时长
6-12 weeks
期刊介绍: Geology of Ore Deposits is a periodical covering the topic of metallic and nonmetallic mineral deposits, their formation conditions, and spatial and temporal distribution. The journal publishes original scientific articles and reviews on a wide range of problems in theoretical and applied geology. The journal focuses on the following problems: deep geological structure and geodynamic environment of ore formation; distribution pattern of metallogenic zones and mineral deposits; geology and formation environment of large and unique metallic and nonmetallic deposits; mineralogy of metallic and nonmetallic deposits; physicochemical and isotopic characteristics and geochemical environment of ore deposition; evolution of ore-forming systems; radiogeology and radioecology, economic problems in exploring, developing, and mining of ore commodities.
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