Redox potential of the Khibiny magmatic system and genesis of abiogenic hydrocarbons in alkaline plutons |
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Authors: | I D Ryabchikov L N Kogarko |
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Institution: | 1.Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry,Russian Academy of Sciences,Moscow,Russia;2.Vernadsky Institute of Geochemistry and Analytical Chemistry,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The temperature and redox conditions of the crystallization of rocks from the Khibiny alkaline pluton have been estimated
based on an analysis of coexisting magnetite, ilmenite, titanite, and pyroxene. Under redox conditions characteristic of the
Khibiny Complex, CO2 is contained in fluid and carbonate anions are contained in melt at high temperature; then graphite is released and an appreciable
amount of hydrocarbons appear at a lower temperature as products of reaction of graphite with fluid. Abiogenic hydrocarbons
can arise in igneous complexes owing to a processes distinct from Fischer-Tropsch synthesis. |
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