26.11 NATURE OF CARBON OF EARLY DOCAMBREY GRAPHITE DEPOSITS OF THE UKRAINIAN SHIELD

UDC 553.078• 📖 Issue 26 / 2016 • 120-128 pages

 

M. Yaroshchuk., O. Musych

M. Yaroshchuk, Dr.Sc. (Geol.- Min), leading researcher SI «Institute of Environmental Geochemistry of the NAS of Ukraine» marina_yaroshchuk@meta.ua;
O. Musych Ph.D. (Biology), senior researcher, SI «Institute of Environmental Geochemistry of the NAS of Ukraine» Nad79eva@bygmir.net.

Abstract

The role of abiotic carbon in graphite formation, related to the intense interaction of reduced mantle carbonaceous fluids and the rocks crust and metamorphism of graphite rocks in deep conditions of granulite facies, is substantiated. The main volatile components of magmatic and metamorphic processes – water and carbon dioxide, are separated from the deep interior, penetrating into the earth’s crust in the form of ready-made chemical compounds, products of chemical reactions between hydrogen, hydrocarbons and oxygen, are constantly taking place in the earth’s crust in the process of its development and formation. Water and carbon dioxide as the main components of a mixture of gases released from the great depths of the Earth to the surface and have survived to our time, thanks to its low volatility, and their source (CO2, CO, CH4) is the reaction of ambient carbon (graphite) in mantle rocks with water. The formation of graphite ore deposits of the Ukrainian Shield dedicated to contacts between highly aluminous gneisses and carbonate rocks, can be explained by the interaction of CO2 liberated during calciphyres skarn formation and reduced deep fluids coming in tectonized area of these rocks contacts. High- temperature metamorphism caused recrystallization of fine carbonaceous matter in holocrystalline graphite. These data can be used as a search criterion for opening of the graphite deposits.

 

Key words: graphite, biogenic and abiogenic carbon, carbon’s fluids, metamorphism of graphite’s rocks.

 

Article



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