The multi-isotope composition of sulfur in sulfides and microfossils of the Mesoarchean Leksa pyrite ore occurrence of the Karelian Craton: new data on abiogenic and biogenic effects on the formation of ancient ores

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Abstract


The first data on the multi-isotopic composition of sulfur of sulphides and fossilized microorganisms, first discovered in Mesoarchean (about 2.9 billion years) SCM of the Karelian Craton, are given. As a result of detailed electron-microscopic and microprobe studies, the presence of several varieties of suspected microfossils - silicate cocoids, pyrite-marcasitic spheroids, and hollow tubes - was found in sedimentary rocks of the Lex’s ore occurrence. It is shown that the isotopic composition of sulfur correlates with the typomorphic features of sulfides, their composition and indicates a significant participation of sedimentary sulfur in pyrite ore formation. The process of deposition of iron sulfide occurred with active biological participation.


About the authors

S. V. Vysotskii

Far East Geological Institute, Far East Branch, Russian Academy of Sciences

Author for correspondence.
Email: vysotskiy@fegdi.ru

Russian Federation, 159, 100-letya avenue, Vladivostok, 690022

A. I. Khanchuk

Far East Geological Institute, Far East Branch, Russian Academy of Sciences

Email: vysotskiy@fegdi.ru

Russian Federation, 159, 100-letya avenue, Vladivostok, 690022

Academician of the Russian Academy of Sciences

L. V. Kuleshevich

Institute of Geology of the Karelian Research Centre of the Russian Academy of Sciences

Email: vysotskiy@fegdi.ru

Russian Federation, 11, Poushkinskaya street, Petrozavodsk, Karelia, 185910

A. V. Ignat’iev

Far East Geological Institute, Far East Branch, Russian Academy of Sciences

Email: vysotskiy@fegdi.ru

Russian Federation, 159, 100-letya avenue, Vladivostok, 690022

A. I. Slabunov

Institute of Geology of the Karelian Research Centre of the Russian Academy of Sciences

Email: vysotskiy@fegdi.ru

Russian Federation, 11, Poushkinskaya street, Petrozavodsk, Karelia, 185910

T. A. Velivetskaya

Far East Geological Institute, Far East Branch, Russian Academy of Sciences

Email: vysotskiy@fegdi.ru

Russian Federation, 159, 100-letya avenue, Vladivostok, 690022

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