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Atypical graphite occurrences in zavallya field

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Category: Geology

Last Updated on 28 July 2014

Published on 13 August 2013

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Authors:

V.M. Zagnitko, Doctor of Geological and Mineralogical Sciences, Professor, Taras Shevchenko National University of Kyiv, Faculty of Geology, Kyiv, Ukraine.

N.M. Lyzhachenko, Taras Shevchenko National University of Kyiv, Postgraduate Student, Kyiv, Ukraine.

S.I. Kurylo, Postgraduate Student, Senior Research Fellow of the M.P. Semenenko Institute of Geochemistry Mineralogy and Ore Formation of the National Academy of Sciences of Ukraine, Kyiv, Ukraine

Abstract:

Purpose. To give a comprehensive description and evaluation of graphite-tremolite metasomatites’ formation conditions based on mineralogical and petrographic, isotopic and analytical data.

Methodology. We have carried out the petrographic study for a continuous series of thin sections that represent completely the facies of the core-sample and determined the isotopic composition of the graphitic carbon from central part of the metasomatite. We have determined the macro-component content (silicate analysis) by means of X-ray fluorescence method with wave dispersion and concentrations of impurity elements by means of energodispersive X-ray fluorescence method, and have carried out the study of the chemical composition of individual minerals by electron microscope. These analytical studies have been conducted in the laboratory for mineralogical and geochemical studies of the geological faculty of Taras Shevchenko National University of Kyiv and the laboratory of M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of National Academy of Science of Ukraine.

Findings. Based on comprehensive studies we have found out that graphite-tremolite metasomatites was formed from calciphyre under the influence of high temperature aqueous solutions of silicon. The appearance of graphite in the central zone is associated with the process of decarbonization of primary silicate-carbonate material.

Originality. Zavallya graphite field is limited mostly to the gneiss rocks formed by primary sedimentary organic matter. We present the study of uncharacteristic manifestations of graphite on the basis of isotopic data analysis and describe the most feasible way of its formation.

Practical value. The results will be of practical use in further study and development of graphite metamorphosed strata of the Ukrainian shield.

References:

1. Войтович В.С. Генезис Завальевського графитового месторождения / В.С. Войтович // Геол. журн. – 1990. – № 2. – С. 138–144.

Voitovich, V.S. (1990), “Genesis of Zavallya graphite deposit”, Geologichnyi zhurnal, no.2, pp. 138–144.

2. Загнітко В.М. Проблеми генезису та стратиграфії карбонатних порід бузької серії Українського щита / В.М. Загнітко, Л.М. Степанюк, Н.М. Лижаченко // Геохімія та рудоутворення – 2010. – № 28. – С. 25–29

Zagnitko, V.M., Stepanyuk, L. and Lyzhachen­ko, N.M. (2010), “The problem of the Genesis and stratigraphy of carbonate rocks of the Bug series of the Ukrainian shield”, Geokhimia ta rudoutvorennia, no. 28, pp. 25–29.

3. Luque, F.J., Pasters, J.D., Wopenka, B, Rodas, M. and Barrenechea, J.F. (1998), “Natural fluid-deposited graphite: mineralogical characteristics and mechanisms of formation”, American journal of science, Vol. 298, pp. 471–498.

4. Яценко В.Г. Геология, минералогия и генезис графита Украинского щита / Яценко В.Г. – К.: Логос, 2008 – 127 с.

Yatsenko, V.G. (2008), Geologiya, mineralogiya i genesis grafita Ukrainskogo schita [Geology, Mineralogy and Genesis of Graphite of the Ukrainian Shield], Logos, Kiev, Ukraine.

5. Шакіна К.А. Графітове зруденіння на Завалівському родовищі як результат гідротермальної діяльності / К.А. Шакіна, Л.З. Скакун // Геохімія та рудоутворення. – 2009. –№ 27. –С. 50–53.

Shakina, K.A. and Skakun, L.Z. (2009), “Graphite mineralization of Zavallya field as a result of hydrothermal activity”, Geokhimia ta rudoutvorennia, no. 27, pp. 50–53.

6. Степанюк Л.М. Последовательность проявления геологических процессов в породах бугской серии / Л.М. Степанюк // Минерал. журн. – 1999. – № 5/6. – С. 89–92.

Stepanyuk, L.M. (1999), “The sequence of the appearances of geological processes in the rocks of the Bug series”, Mineralogichnyi zhurnal, no.5/6, pp. 89–92.

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