K.I. Hoholev1, V.M. Zagnitko2
1-M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
ORCID 0000-0002-7727-9965
2-Institute of Geology Taras Shevchenko National University of Kyiv
ORCID 0000-0003-0165-0534
Language: Ukrainian
Geochemistry and ore formation 2019, 40: 48-57
https://doi.org/10.15407/gof.2019.40.048
The features of chemical, mineral and isotopic composition of low-grade metamorphic BIF are discussed. The comparison between iron producing areas of other Precambrian shields is made. Particular attention is paid to carbonate-ferruginous rocks, the genesis of which is the most speculative. Based on the comparison of isotopic composition of oxygen and carbon, and applying the calculations of chemical composition of BIF on normative mineralogical composition in the MINLITH program the following results are achieved: (1) The probable conditions of the sedimentation of primary BIF components of the Ukrainian Shield were found. In low-temperature metamorphic associations of carbonate-ferruginous rocks of Precambrian carbonates are mainly of primary sedimentary and diagenetic origin; (2) The comparison of isotopic, petro- graphic and mineralogical data indicates close physical and chemical conditions of formation of iron oxides and iron carbon- ates over a long period of BIF formation on different continents. The physical and chemical conditions and the role of vol- canogenous, terrigenous and chemogenous components in BIF sedimentation were found. The climate conditions during sedimentation were defined as arid, and the tectonic settlement as shallow inland seas. The influence of the supergene processes on the isotopic composition of carbonates of BIF was proved. These processes led to a decrease of concentrations of 18O isotope in minerals of iron associations.
Keywords: ferruginous-siliceous formation, sedimentation, metamorphism, isotopic composition, genesis.
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