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Although hydrocarbon-bearing fluids have been known from the alkaline igneous rocks of the Khibiny intrusion for many years, their origin remains enigmatic. A recently proposed model of post-magmatic hydrocarbon (HC) generation through Fischer-Tropsch (FT) type reactions suggests the hydration of Fe-bearing phases and release of H 2 which reacts with magmatically derived CO 2 to form...
Laser Raman and microthermometric analysis have been used independently to calculate the molar proportions of mixed CH 4 –CO 2 fluid inclusions in quartz from the South Wales Coalfield, UK. The respective ratios of the mean values obtained are 84:16 and 85:15 mol%. Therefore, the fluid inclusions are suitable for independently checking the validity of LRM and microthermometric data,...
The Khibiny Complex hosts a wide variety of carbon-bearing species that include both oxidized and reduced varieties. Oxidised varieties include carbonate minerals, especially in the carbonatite complex at the eastern end of the pluton, and Na-carbonate phases. Reduced varieties include abiogenic hydrocarbon gases, particularly methane and ethane, dispersed bitumens, solid organic substances and graphite...
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