AN UNUSUAL ASSOCIATION OF HYDROTHERMAL PLATINUM-GROUP MINERALS FROM THE IMANDRA LAYERED COMPLEX, KOLA PENINSULA, NORTHWESTERN RUSSIA
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dc.contributor.author | Barkov A.Y. | |
dc.contributor.author | Fleet M.E. | |
dc.date.accessioned | 2022-11-08T06:07:43Z | |
dc.date.available | 2022-11-08T06:07:43Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=14428908 | |
dc.identifier.citation | The Canadian Mineralogist, 2004, 42, 2, 455-467 | |
dc.identifier.issn | 0008-4476 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/39609 | |
dc.description.abstract | An unusual association of platinum-group minerals (PGM) is observed in a chromitite layer of the Mount Bol' shaya Varaka deposit, Imandra layered complex, Kola Peninsula, Russia. The PGM typically occur as cluster-like. or chain-like micro-aggreates. and as separate minute g-rams located in contact with chromite along grain boundaries. The PGM are enclosed in magnesiohornblende, edenite, talc, or phlogopite, and may transect the host hydrous silicates; they include sperrylite, laurite-erlichmanite. unnamed Cu-2(Ni,Co)Pt3S8. hollingworthite, pyrite rich in the platinum-group elements (Ru 10.96, Os 0.98, and Ir 0.54 wt.%), nickelian platarsite(?), (Pt0.71Ni0.26Co0.05)(Sigma1.02)As1.10S0.88, daomanite, and cooperite. Concentrations of Rh and S in the rhodian sulfurian sperrylite vary front 1.0 and 0.8 to 6.6 and 4.9 wt.%, respectively, and the composition most enriched in Rh and S is (Pt0.78Rh0.20Ir0.03)(Sigma1.01)(As1.53S0.47)(Sigma2.00). The correlations Pt-Rh (correlation coefficient R = -0.99), Pt-As (R = 0.98), PtS (R = -0.99). Rh-As (R = -0.97), Rh-S (R = 0.97), and As-S (R = -1.00) are important and consistent with the existence of a new series of solid solution, extending from PtAs2 toward the pyrite-type Rh1-xS2 ("Rh2S5"). Most of the PGM precipitated during deuteric alteration at a postmagmatic-hydrothermal stage of crystallization of the chromitite. The majority of the laurite-erlichmanite grains display a close textural relationship with the hydrous silicates and form part of the hydrothermal mineralization at Imandra. | |
dc.subject | platinum-group elements | |
dc.subject | platinum-group minerals | |
dc.subject | substitutions | |
dc.subject | hydrothermal mineralization | |
dc.subject | chromitite layer | |
dc.subject | layered intrusion | |
dc.subject | mafic rocks | |
dc.subject | Mount Bol’shaya Varaka | |
dc.subject | Imandra complex | |
dc.subject | Baltic Shield | |
dc.subject | Russia | |
dc.title | AN UNUSUAL ASSOCIATION OF HYDROTHERMAL PLATINUM-GROUP MINERALS FROM THE IMANDRA LAYERED COMPLEX, KOLA PENINSULA, NORTHWESTERN RUSSIA | |
dc.type | Статья |
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