Native elements in rocks of the banded iron formation,Kola Peninsula |
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| Authors: | A V Bazai G Yu Ivanyuk Ya A Pakhomovsky P M Goryainov V N Yakovenchuk |
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| Institution: | (1) State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China;(2) Faculty of Earth Resources, China University of Geosciences, Wuhan, 430074, China;(3) Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China; |
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| Abstract: | Eleven native minerals and intermetallic alloys were identified in rocks of the banded iron formation (BIF) in the Kola Peninsula:
copper, silver, gold, electrum, auricupride, cuproauride, tetraauricupride, bismuth, sulfur, tellurium, and graphite. Graphite
is a common mineral of sulfide-bearing BIF and gneiss. Sulfur occurs in supergene-altered sulfide-bearing BIFs together with
Fe- and Ca-sulfates. Gold of low fineness (electrum) in association with electrum, acanthite, auricupride, volynskite, hessite,
cervelleite, pavonite, petzite, and bismuth is related to the areas of hydrothermally altered skarnoids with greenalite, chamosite,
aegirine, and Na-Ca amphibole. Redeposited gold of high fineness associated with auricupride, hessite, silver, electrum, kostovite,
cuproauride, tetraauricupride, and sperrylite occurs in low-temperature zonal hydrothermal segregations hosted in aluminous
gneiss and which formed under the effect of alkalized, highly siliceous solutions at the regressive stage of BIF metamorphism. |
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