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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

no journal, ,

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.

Oral presentation

Form of potassium in clay minerals from Miocene andesite in the west coast of the Noto Peninsula

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

no journal, ,

Based on our analysis of XAFS, TEM, etc., we found that our analyzed clay minerals include potassium-fixed structure like illite, even if only smectite is identified in them according to XRD analysis.