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Federov Pansky Layered Mafic Intrusion |
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Russia |
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PGE PGM Cu Ni
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Super Porphyry Cu and Au
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The 2501 to 2446 Ma Federov Pansky PGE and Copper-Nickel bearing layered mafic intrusion is located in the central part of the Kola Peninsula in northwestern Russia, along the northern contact of the Early Proterozoic Imandra-Varzuga rift and Archaean granite gneiss. It is one of 14 major Palaeoproterozoic layered intrusions known in the Baltic Shield.
The 250 sq. km intrusion has been subdivided into eight zones/layers, as follows from top to bottom:
1). The 400 m thick Upper Gabbro zone.
2). The Upper Layered Horizon zone which is 250 m thick,
3). A 1500 m thick Gabbro zone,
4). The Lower Layered Horizon zone which is 100 m thick,
5). The 1000 m thick main Gabbronorite zone,
6). A 200 m thick Norite zone,
7). 150 to 300 m of Taxitic Gabbronorite,
8). 50 to 100 m thick Marginal zone mafic schists,
The Taxitic Gabbro-norite zone, which is restricted to particular sections of the intrusive, hosts Cu-Ni-PGE mineralization as disseminated sulphides forming a continuous body over a strike length of more than 2.5 km and for 150 to 200 m down dip. The mineralisation is almost entirely composed of varying amounts of pyrrhotite, chalcopyrite, and pentlandite and falls within two zones, namely an upper mineralised section with two higher-grade lenses, A and B, and the restricted lower mineralised section with six narrower lenses. The lower mineralised section is less continuous and less uniform a less uniform distribution of Cu-Ni-PGE mineralisation. Norite xenoliths in the Taxitic Gabbro-norite zone are virtually barren of and dilute PGE and base metal grades within the gabbro-notite.
The average total PGE grade of the mineralisation does not exceed a few grams per tonne and is palladium rich with a Pd/Pt ratio between 4.22 and 4.34. Rh and Au are from 0.1 to 0.5 g/t, while Os and Ir are <0.1 g/t. Cu is from 0.1 to 0.4%, and Ni from 0.1 to 0.3%, with an average Cu/Ni ratio from 1.44 to 1.80.
The main PGE-bearing minerals are merenskyite, moncheite, kotulskite, sobolevskite and michenerite with lesser sperrylite and vysotskite-braggite.
For detail consult the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 2002.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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Schissel D, Tsvetkov A A, Mitrofanov F P, Korchagin A U 2002 - Basal Patinum-Group Element mineralization in the Federov Pansky layered mafic intrusion, Kola Peninsula, Russia: in Econ. Geol. v97 pp 1657-1677
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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