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Fig. 7 | Earth, Planets and Space

Fig. 7

From: Sulfur isotopic characteristics of volcanic products from the September 2014 Mount Ontake eruption, Japan

Fig. 7

X-ray diffraction (XRD) patterns of a randomly oriented bulk pyroclastic material (OT-3) and b oriented clay fractions (<2 µm) separated through elutriation of the OT-3 sample from the 2014 Mt. Ontake eruption. The clay-fraction samples were examined with XRD after various treatments (ethylene glycol treatment, HCl treatment, and heating at 500 °C). Note that the smectite peak of the untreated clay fraction was shifted after the ethylene glycol, HCl, and heating treatments. Abbreviations for minerals: Aln alunite, Ah anhydrite, Bt biotite, Cb cristobalite, Gp gypsum, Ka kaolin minerals, Pl plagioclase, Py pyrite, Pph pyrophyllite, Q quartz, Sm smectite

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