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Oral presentation

Chemical speciation of potassium in altered minerals from Miocene andesite in the west coast of the Noto Peninsula and their K-Ar ages

Unami, Kensuke*; Fukushi, Keisuke*; Takahashi, Yoshio*; Itaya, Tetsumaru*; Niwa, Masakazu

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K-Ar dating is generally not applicable to smectite, which is potassium-free clay mineral. However, based on multidisciplinary analyses such as XRD, TEM, exchangeable cation analysis, and XAFS, fixed potassium can exists in clay minerals in which only smectite is identified by XRD analysis.

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