Talk:Shirasu-Daichi

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Latest comment: 2 years ago1 comment1 person in discussion

Interesting Google translate told me that Shirasu-Daichi is a Japanese translation which might mean the whitefish like earth . “Shirasu” is a local name of pumiceous sediments in Kagoshima Prefecture, Japan.^[1]

Looks to me we are talking about the pyroclastic output of volcanoes such as Aira Caldera and Ito pyroclastic flow but context is difficult for those of us who have not visited this locality. Shirasu now means ignimbrite deposits. The Ito Ignimbrite obviously is the last major eruption on the Plateau but this is only up to 160m thick, so are there earlier eruptive products? . ^[2]. There was a fair tephra fall forming the Aira-Tn tephra layer dated at 25,120 ± 270 bp.^[3] Presumably Ebino Plateau is part but that is for someone who knows the locality.

^ "Applied Geological Problems of Shirasu (シラスの応用地質学的諸問題)". 地学雑誌 (Earth Science Magazine. 1989. doi:10.5026/jgeography.98.4_379.
^ Baer, E. M. (1997). "Turbulent transport and deposition of the Ito pyroclastic flow: Determinations using anisotropy of magnetic susceptibility". Journal of Geophysical Research: Solid Earth. 102: 22565–22586.
^ "Improved 14 C dating of a tephra layer (AT tephra, Japan) using AMS on selected organic fractions" (PDF). Nuclear Instruments and Methods in Physics Research B. doi:10.1016/j.nimb.2004.04.103.

ChaseKiwi (talk) 17:37, 11 September 2022 (UTC)Reply

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[1] "Applied Geological Problems of Shirasu (シラスの応用地質学的諸問題)". 地学雑誌 (Earth Science Magazine. 1989. doi:10.5026/jgeography.98.4_379.

[2] Baer, E. M. (1997). "Turbulent transport and deposition of the Ito pyroclastic flow: Determinations using anisotropy of magnetic susceptibility". Journal of Geophysical Research: Solid Earth. 102: 22565–22586.

[3] "Improved 14 C dating of a tephra layer (AT tephra, Japan) using AMS on selected organic fractions" (PDF). Nuclear Instruments and Methods in Physics Research B. doi:10.1016/j.nimb.2004.04.103.

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