Journal of the Japan Society of Engineering Geology
Online ISSN : 1884-0973
Print ISSN : 0286-7737
ISSN-L : 0286-7737
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Volume 63, Issue 5
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  • Identification of Zenikame-Menagawa Tephra Using Major Element Compositions of Amphibole Phenocrysts
    Hazuki WATANABE, Rina OKADA, Koji UMEDA, Yuuki NISHIDA
    2022 Volume 63 Issue 5 Pages 228-236
    Published: December 10, 2022
    Released on J-STAGE: February 14, 2023
    DOIhttps://doi.org/10.5110/jjseg.63.228
    JOURNAL FREE ACCESS
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    Petrochemistry of the mafic minerals played an important role in the identification and correlation of tephra layers that include few glass shards, due to chemical weathering and/or alteration. The analyses are applied to the correlation of the Zenikame-Menagawa tephra（Z-M）in the Tokachi district, eastern Hokkaido, with those erupted from Zenikame volcano, located about 200 km west of the district. By utilizing quantitative major element analysis of amphiboles, distal Z-M tephra layers are recognized to be interbedded with the eruptive deposits, derived from Kuttara volcano. Accordingly, the eruption age of the Z-M is estimated to be between 44.1 and ca. 54 ka.

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Serialization Course Key Points of Civil Engineering Geological Investigation in Geological Bodies
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