Mathematics – Logic
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997gecoa..61...83s&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 61, Issue 1, p. 83-99.
Mathematics
Logic
16
Scientific paper
The composition of the carbonic phase(s) of fluid inclusions in pegmatite quartz from the Strange Lake peralkaline complex has been analysed by gas chromatography using online extraction of inclusion contents and a PoraPLOT® Q capillary column. The measured gas species are, in order of abundance, CH4, H2, C2H6, CO2, N2, CA, n-C4H10, n-C5H12, C2H2, i-C4H10 and C2H4 Minor amounts of i-C5H12, n-C6H14, i-C6H14, and neo-C6H14 were also detected (but not quantified) in some samples. A suite of quartz samples from Ca-metasomatised pegmatites contains fluid inclusions with a similar distribution of hydrocarbons but much higher proportions of C02. The carbonic fluid coexisted immiscibly with a brine (Salvi and Williams-Jones, 1992), which on the basis of field and petrographic evidence, was interpreted to have originated from the magma. However, thermodynamic calculations indicate that the above gas species, specifically the hydrocarbons, could not have coexisted at equilibrium in the proportions measured, at any geologically reasonable conditions either prior to or post entrapment. We propose, instead, that the gas compositions measured in the Strange Lake inclusions, and in inclusions from other alkalic complexes, resulted from the production of H2 during the alteration of arfvedsonite to aegirine, and the subsequent reaction of this H2 with orthomagmatic C02 and CO to form hydrocarbons in a magnetite-catalysed Fischer-Tropsch synthesis. Locally, influx of an oxidised calcic brine, derived externally from the pluton, altered the original composition of the fluid by converting hydrocarbons to C02.
Salvi Stefano
Williams-Jones Anthony E.
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