DBPapers
DOI: 10.5593/SGEM2015/B11/S1.024

GEOCHEMISTRY OF SEDIMENTARY IRON ORES BAKCHAR DEPOSIT, WESTERN SIBERIA

E. Asochakova
Tuesday 4 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-31-5 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 1, 181-188 pp

ABSTRACT
Bakchar deposit is one part of the biggest west-Siberian iron ore basin, which is a broad band of Cretaceous-Paleogene coastal-marine clastic sediments with oolitic ironstone. When studying the ore sediments, were distinguished three essential ore types in the geological section. The first type is goethite-hydrogoethitic oolitic ores representing cemented or loose sediments of brownish colour with oolites and clastic materials. The second ore type is glauconite-chloritic, are distinguished for their dense, weakly cemented structure and the greenish-gray colour with clay minerals and oolites. The third transitional ore type bears the signs of both goethite-hydrogoethitic and glauconite-chloritic formations. The study of lithochemical features of oolitic iron ores showed that the main reason that determines their diversity, is a variation of the amount of terrigenous and ore components. It controls and distribution of trace elements, which in the context of complex ore uneven. All oolitic iron ore characterized by elevated concentrations of many trace elements among which are valuable as alloying (Mn, V, Cr, Ti, Zr, Mo et al.) and harmful (S, As, Cu, Pb, Zn, P). Enrichment oolitic iron ores rare earths due to the presence of micro-phosphates and their resistance to oxidation. Distribution of trace elements shows separation of geochemical and genetic relationships in the different type of iron ore Bakchar deposit.

Keywords: oolitic iron ore, trace element, REE

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