Fission Track Ages of Pyroclastic Flows in the Pliocene Ashoro Formation and the Plio-Pleistocene Ikeda Formation Developed in Eastern Hokkaido, Japan

Koshimizu, Satoshi

北海道大学理学部紀要, 1981, 19(4), 505-518

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URI	https://hdl.handle.net/2115/36700
タイトル	Fission Track Ages of Pyroclastic Flows in the Pliocene Ashoro Formation and the Plio-Pleistocene Ikeda Formation Developed in Eastern Hokkaido, Japan
著者	著者名 Koshimizu, Satoshi
言語	英語
発行日	1981-02
出版者	北海道大学
出版者	Hokkaido University
収録物名	北海道大学理学部紀要
収録物名	Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy
巻(号)	19(4)
ページ	505-518
抄録	Fission track ages of the three pyroclastic flow deposits developed in the Tokachi Province, eastern Hokkaido, have been determined by means of grain by grain method of zircon extracted from these deposits. The following results have been obtained; 3.7±0.1 m.y. for the Inashibetsu pyroclastic flow deposits of the Ashoro Formation; 2.8±O.2 m.y. for the Sarubetsu pyroclastic flow deposits; and 2.0±O.1 m.y. for the Chiyoda pyroclastic flow deposits, both the latter two are of the Ikeda Formation. Pliocene-Pleistocene boundary in this Province must therefore lie somewhere which may be slightly above the horizon of Chiyoda pyroclastic flow deposits of the Ikeda Formation.
資源タイプ	紀要論文
出版タイプ	Version of Record
PISSN	0018-3474