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北海道地方の第4紀テフラ研究

https://hiroshima.repo.nii.ac.jp/records/2010454
https://hiroshima.repo.nii.ac.jp/records/2010454
bb8dd02d-544f-4e4b-a4c8-fcd0c1c54990
名前 / ファイル ライセンス アクション
QuaternaryRes_30-5_379.pdf QuaternaryRes_30-5_379.pdf (1007.0 KB)
Item type デフォルトアイテムタイプ_(フル)(1)
公開日 2023-03-18
タイトル
タイトル 北海道地方の第4紀テフラ研究
言語 ja
タイトル
タイトル Quaternary Tephra Studies in the Hokkaido District, Northern Japan
言語 en
作成者 奥村, 晃史

× 奥村, 晃史

ja 奥村, 晃史

en Okumura, Koji

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
主題
主題Scheme NDC
主題 450
内容記述
内容記述 The critical problems remaining for the study of the Quarternary tephrochronology of Hokkaido in the 1980s were the lack of extensive marker tephras and of well-defined chronological data beyond the range of 14C method. In the last ten years, these problems were partly solved for the Holocene and Late Pleistocene with the recognition of a number of remarkable wide-spread tephra-layers including B-Tm (< 1 ka) Aso-4 (70 ka), Toya (90 ka) and KHb (100 ka). The finding of Aso-4 and Toya layers enabled to correlate the tephrochronology of Hokkaido with that of Honshu and Kyushu. Meanwhile, information on Early to Middle Pleistocene tephras is still insufficient for establishing a comprehensive chrono-stratigraphy in most of Hokkaido, with the exception of the region around the Tokachi Plain. The tephrostratigraphy in eastern Hokkaido is described in this paper in order to summarize recent progress and to show the outline of Quaternary tephras in Hokkaido. The stratigraphy of pyroclastic flow deposits from Akan and Kutcharo volcanoes, which have the longest history of explosive activities in Hokkaido, has been revised and interrelated through stratigraphic revision and extensive application of microprobe techniques to glass shards. Intervening airfall tephras with different petrographic characteristics from tephras occurring in eastern Hokkaido are introduced as possible marker tephras of Early to Middle Pleistocene age. Chronological data for Middle Pleistocene tephras are still very few, but their stratigraphic positions in relation to major transgressions are revealed. Temporal and regional variation of potassium content in glass shards and maffic mineral assembrage is examined to give general ideas of source volcanoes and ages of unidentified tephra layers of Early to Middle Pleistocene.
言語 en
出版者
出版者 日本第四紀学会
言語
言語 jpn
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0418-2642
収録物識別子
収録物識別子タイプ NCID
収録物識別子 AN0034136X
開始ページ
開始ページ 379
書誌情報 第四紀研究
第四紀研究

巻 30, 号 5, p. 379-390, 発行日 1991-12
旧ID 26263
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