Summary
During the last few years nearly 50 minerals and unnamed platinum-group element (PGE) phases have been identified by the authors in nickel-bearing mafic-ultramafic massifs of the Kola region. About 20 established PGE minerals have been found whilst more than 20 previously undescribed and unnamed PGE phases can be reported. In addition high concentrations of these elements in sulfarsenides of the cobaltitegersdorffite series have been established. The PGE phases form tiny (5–70 µm, seldom larger) mono- and polymineral inclusions in the main sulfides of the nickel-copper mineralization; at the contacts with silicates and within the silicates themselves. The details of the composition of platinum mineralization in various massifs, its formation under magmatic and hydrothermal conditions and wide isomorphism in certain groups of minerals have been established. Specific features of PGE mineralization of the region as a whole are: the predominance of bismuth tellurides and arsenides of palladium and platinum, a highly subordinated role of their sulphides and higher concentrations of several PGE in sulfarsenides.
Zusammenfassung
In den vergangenen Jahren wurden etwa 50 z.T. noch unbekannte Minerale von Platingruppen-Elementen (PGE) in Ni-führenden mafisch-ultramafischen Gesteinen der Kola Region bestimmt (ca. 20 bereits bakannte und mehr also 20 bisher nicht beschriebene bzw. noch unbenannte PGE-Minerale). Außerdem wurden hohe Konzentrationen dieser Elemente in Sulfarseniden der Cobaltit-Gersdorffit-Reihe nachgewiesen.
Die PGE-Minerale kommen als mono- und polymineralische Einschlüsse in den Sulfiden der Ni-Cu-Mineralisation, am Kontakt der Sulfide zu den Silikaten und in den Silikaten selbst vor. Details über die PGE-Mineralisation in verschiedenen Gebieten, ihre Bildung unter magmatischen und hydrothermalen Bedingungen und die Isomorphiebeziehungen innerhalb bestimmter Mineralgruppen werden dargestellt.
Spezifische Eigenheiten der PGE-Mineralisation dieser Region sind: Das Vorherrschen von wismutvtelluriden, sowie von Pd- und Pt-Arseniden, die untergeordnete Rolle von Pd- und Pt-Sulfiden und erhöhte Gehalte bestimmter PGE in den Sulfarseniden.
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Contribution to the Fifth International Platinum Symposium, Helsinki, August 1989.
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Yakovlev, Y.N., Mitrofanov, F.P., Razhev, S.A. et al. Mineralogy of PGE in the mafic-ultramafic massifs of the Kola region. Mineralogy and Petrology 43, 181–192 (1991). https://doi.org/10.1007/BF01166890
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DOI: https://doi.org/10.1007/BF01166890