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• W3136376053 endingPage "103247" @default.
• W3136376053 startingPage "103247" @default.
• W3136376053 abstract "We used micro-Raman spectroscopy to analyze volcanic ejecta from the 7 March 2012 phreatic eruption at Old Crater (Million Dollar Hole) on Ioto Island, Izu-Bonin arc, Japan, to assess the ability of this technique to identify clay and other alteration minerals in volcanic ejecta. We also analyzed five reference clay minerals (kaolinite, dickite, pyrophyllite, montmorillonite, and saponite) using the same technique. Dickite, montmorillonite, gypsum, pyrite, marcasite, quartz (α-quartz), and anatase were identified by comparison with spectra of the reference materials and published databases. These minerals occur in close spatial association with each other. Marcasite, quartz, and anatase in aliquots of the sample were not observed by a previous powder X-ray diffraction (XRD) study. The presence of dickite, montmorillonite, gypsum, quartz, marcasite, and anatase indicates that these alteration minerals were likely derived from the acidic alteration zone (150–190 °C) below the crater on Ioto Island. Our results demonstrate that Raman microspectroscopy, compared with conventional XRD, is a more sensitive technique for identifying and characterizing alteration minerals present in the volcanic ejecta. However, owing to the strong fluorescence from clay minerals during Raman analysis, the presence of other minerals in the sample may be overlooked. Therefore, the use of the two techniques in combination can be a powerful tool for obtaining a full understanding of mineral phases in volcanic ejecta from phreatic eruptions, thereby providing more accurate information on the hydrothermal conditions below volcanic craters." @default.
• W3136376053 created "2021-03-29" @default.
• W3136376053 creator A5053895506 @default.
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• W3136376053 date "2021-05-01" @default.
• W3136376053 modified "2023-09-23" @default.
• W3136376053 title "Raman microspectroscopic study of reference clay minerals and alteration minerals in volcanic ejecta from the 7 March 2012 phreatic eruption on Ioto Island (Iwo-jima), Izu-Bonin arc, Japan" @default.
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• W3136376053 doi "https://doi.org/10.1016/j.vibspec.2021.103247" @default.
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