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- W1563643162 abstract "The Kola alkaline province of NW Russia is the type example of the occurrence ofabiogenic hydrocarbons (HCs) in crystalline rocks. Methane and higher hydrocarbons, up toC5H12, are contained primarily within abundant fluid inclusions in rock-forming minerals oras free gas contained in sealed microfractures or along grain boundaries. Such occurrences arenot unique to Kola. High-temperature, hydrocarbon-rich fluid inclusions are present inalkaline rocks from Ilimaussaq, Greenland, and in recent years they have been described inother silica-undersaturated igneous rocks as well as in hydrothermal systems associated withbasic igneous rocks.Two main models (Potter and Konnerup-Madsen, 2003) have been proposed for thegenesis of these abiogenic HCs: (1) a late-magmatic model whereby the HCs are equilibriumproducts of volatiles exsolved directly from magmas, and; (2) a post-magmatic,disequilibrium model whereby HCs are generated via Fischer-Tropsch type reactions at ca.350°C involving CO2 and H2O bearing fluids, linked to redox reactions accompanyinghydrothermal alteration.This paper reports on recent and current research on the origin and distribution of HCsfrom the Khibina and Lovozero intrusions of the Kola Peninsular that supports an abiogenicorigin through Fischer- Tropsch synthesis.An approximate estimate of the total volume of HCs contained within these rocks canbe made on the assumption that CH4-rich inclusions, with a mean density of 0.1 g/cc occupy0.1% on the total rock volume. For a body of rock 20 x 10km (less than 10% of the area of theKhibina and Lovozero intrusions) and 1km thickness this corresponds to some 40 milliontonnes of methane and associated higher HCs.Due to the low permeability these complexes cannot yet be considered as potentiallyeconomic. However, large volumes of free-flowing methane have been recorded as beingreleased when rocks are fractured as a result of drilling during underground mining (Nivin etal., 2001) suggesting the ease with which sealed microfractures and fluid inclusions planesmay be opened up and connected. Hence they are potential source rocks for abiogenic HCsespecially in areas where there has been major faulting and accompanying hydrothermalalteration. Where these faults extended to sufficient depth to intersect suitable conditions forFischer-Tropsch reactions they would have acted as focal points for HC generation as well ashaving acted as suitable pathways for their migration to potential traps at higher levels in thecrust. Modern day reactivation of these fault systems, by either natural or anthropogenicprocesses will cause the release of significant amounts of methane and higher HCs trapped ongrain boundaries and in secondary fluid inclusions." @default.
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- W1563643162 date "2003-09-01" @default.
- W1563643162 modified "2023-09-27" @default.
- W1563643162 title "Alkaline igneous rocks of the Kola Peninsula: potential source rocks for abiogenic hydrocarbons via Fischer-Tropsch type reactions" @default.
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