Water Content of Melt Inclusions in Phenocrysts Using Secondary Ion Mass Spectrometer

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  • SIMSによる斑晶メルト包有物の含水量分析
  • Water Content of Melt Inclusions in Phe

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Analytical method by secondary ion mass spectrometry, SIMS, is developed for water micro analysis of hydrous silicate glasses. Standard hydrous glasses are synthesized and carefully examined their homogeneities. “Matrix effect” for the determination of hydrogen analysis by the SIMS method is corrected using their SiO2 content (wt. %). Using the SIMS, water contents of andesitic to rhyolitic glasses can be estimated precisely (〓±0.5wt. % H2O). As an application of the SIMS analysis, water contents of melt inclusions and matrix glasses from the Aira eruptive products are examined. The water contents of the melt inclusions are 5-7 wt. % H2O. This is consistent with the water contents calculated by the relationship between water solubility and water pressure from the data of Aramaki (1971).

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