A review of the occurrence, form and origin of C-bearing species in the Khibiny alkaline igneous complex, Kola Peninsula, NW Russia

Nivin, V.A., Treloar, P.J., Konopleva, N.G. and Ikorsky, S.V. (2005) A review of the occurrence, form and origin of C-bearing species in the Khibiny alkaline igneous complex, Kola Peninsula, NW Russia. Lithos, 85(1-4), pp. 93-112. ISSN (print) 0024-4937

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Abstract

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. The majority of the carbon in the Khibiny Complex is hosted in either the carbonatite complex or within the so-called “Central Arch”. The Central Arch is a ring-shaped structure which separates khibinites (coarse-grained eudialite-bearing nepheline syenites) in the outer part of the complex from lyavochorrites (medium-grained nepheline syenites) and foyaites in the inner part. The Central Arch is petrologically diverse and hosts the major REE-enriched apatite-nepheline deposits for which the complex is best known. It also hosts zones with elevated hydrocarbon (dominantly methane) gas content and zones of hydrothermally deposited Na-carbonate mineralisation. The hydrocarbon gases are most likely the product of a series of post-magmatic abiogenic reactions. It is likely that the concentration of apatite-nepheline deposits, hydrocarbon gases and Na-carbonate mineralisation, is a function of long lived fluid percolation through the Central Arch. Fluid migration was facilitated by stress release during cooling and uplift of the Khibiny Complex. As a result, carbon with a mantle signature was concentrated into a narrow ring-shaped zone.

Item Type: Article
Additional Information: Revised version of the paper given at the final field workshop of the EuroCarb European Science Foundation network on mantle carbon and carbon cycling, held in Lanzarote and Fuerteventura, Spain in September 2003. The paper there was entitled:Alkaline igneous rocks of the Kola Peninsula: potential source rocks for abiogenic hydrocarbons via Fischer-Tropsch type reactions.
Research Area: Earth systems and environmental sciences
Faculty, School or Research Centre: Faculty of Science (until 2011) > School of Geography, Geology and Environment > Centre for Earth and Environmental Science Research (CEESR)
Depositing User: Peter Treloar
Date Deposited: 05 Oct 2007
Last Modified: 17 Aug 2012 08:45
URI: http://eprints.kingston.ac.uk/id/eprint/1777

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