Gas Chromatographic Analysis of Fluid Inclusions

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  • 流体包有物のガスクロマトグラフ分析
  • リュウタイ ホウユウブツ ノ ガス クロマトグラフ ブンセキ エイブン

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Abstract

Major gas compositions of fluid inclusions in quartz and anhydrite from epithermal gold deposits and active geothermal systems were determined by the combination of a vacuum system and gas chromatography. A special gas sampler was designed for collection of gases released from fluid inclusions in a vacuum system and for transfer of them to a gas chromatograph. A ball-crushing method or decrepitation method was applied to release inclusion fluids and it was concluded that the decrepitation method was preferable to the crushing method in gas analysis of quartz, because small amounts of N2 and CH4 were generated in case of crushing of quartz. Gas concentrations of fluid inclusions from epither-mal gold deposits and geothermal systems were generally less than 2 in molality (moles/kg of water). Major gas species are CO2, CH4 and N2, and CO2 predominates over CH4 and N2. H2 concentrations of fluids were calculated from CO2 and CH4 concentrations obtained by analysis assuming that the fluids were the H2O-CO2-CH4 H2 system in boiling condition. H2 concentrations of inclusion fluids calculated on the assumption that the systems were not controlled with carbon, agree fairly well with the analyzed ones of the present geothermal fluids. H2 concentrations of fluid inclusions from epithermal gold deposits are in the order of 10-6, in mole fraction, and those of the present geothermal fluids are about 1×10-6 but those of fluid inclusions are about 1×10-5.

Journal

  • Shigen-Chishitsu

    Shigen-Chishitsu 42 (235), 289-299, 1992

    The Society of Resource Geology

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