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Takano, Masahiro*; Kagi, Hiroyuki*; Mori, Yuichiro*; Aoki, Katsutoshi*; Kakizawa, Sho*; Sano, Asami; Iizuka-Oku, Riko*; Tsuchiya, Taku*
Journal of Mineralogical and Petrological Sciences (Internet), 119(1), p.240122_1 - 240122_9, 2024/00
Times Cited Count：0 Percentile：0.00(Mineralogy)Hydrogenation of iron sulfide (FeS) under high-pressure and high-temperature conditions has attracted attention because hydrogen and sulfur are promising candidates as light elements in the cores of the Earth and other terrestrial planets. In earlier reports describing the hydrogenation of FeS, the chemical compositions of starting materials were not fully clarified. This study reports in-situ neutron and X-ray diffraction measurements under high-pressure and high-temperature conditions of an Fe-S-H system using a stochiometric Fe1.000S (troilite) as a starting material. The occupancies determined were significantly lower than those reported from earlier studies, indicating that the hydrogenation of FeS can be affected strongly by the stoichiometry of iron sulfide.
Yuguchi, Takashi*; Izumino, Yuya*; Sasao, Eiji
Journal of Mineralogical and Petrological Sciences (Internet), 117(1), p.220415_1 - 220415_12, 2022/00
Times Cited Count：1 Percentile：9.89(Mineralogy)This study presents the use of petrographic plagioclase alteration indicators as a new method for quantitatively evaluating the extent of plagioclase alteration within granites, using the Toki granite, central Japan. Alteration indicators and areal fractions of microvoids in the plagioclases were obtained via BSE image analysis. The volume of the micropores in the altered plagioclase was characterized by the areal fraction of microvoids in the grains. The plagioclase alteration indicators were obtained as the ratio between the alteration product area and the original plagioclase area. In our previous study, we focused on biotite chloritization indicators. We found positive correlations between the plagioclase alteration and biotite chloritization indicators in the same sample, indicating that each alteration indicator can be used independently as a representative value for the sample. In the Toki granite, the plagioclase alteration was related to the biotite chloritization.
