書誌事項
- タイトル別名
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- Mid-Holocene Widespread Tephra, Komagatake-g (Ko-g) in Hokkaido, Northern Japan
- ホッカイドウ コマガタケ キゲン ノ コウイキ テフラ コマガタケ gテフラ ノ ブンプ ト フンシュツ ネンダイ
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The widespread tephra Komagatake-g (Ko-g), which erupted from Komagatake volcano, is extensively distributed in southern to eastern Hokkaido. Ko-g is characterized by predominantly spongy glass and plagioclase with some orthopyroxene and clinopyroxene. The refractive index of dehydrated volcanic glass ranges from n=1.500-1.505. On the northeastern slopes of Mt. Komagatake, Ko-g is a coarse pumice-fall deposit (-20cm in diameter) with maximum thickness of 125cm. Even in eastern Hokkaido, 360km from the source, Ko-g has a thickness of 5cm and a grain size up to 1/2mm in diameter.<br>Based on several 14C dates obtained from different regions, the eruptive age of Ko-g can be determined to be 6, 500-6, 600 cal yrs BP.<br>Ko-g is an important key tephra for examining some issues in Hokkaido such as Jomon cultures, the mid-Holocene transgression, the chronology of tsunami sediments, and slope deposits in the Hidaka mountains.
収録刊行物
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- 第四紀研究
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第四紀研究 43 (3), 189-200, 2004
日本第四紀学会
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詳細情報 詳細情報について
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- CRID
- 1390001206496154880
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- NII論文ID
- 10013120988
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- NII書誌ID
- AN0034136X
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- ISSN
- 18818129
- 04182642
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- NDL書誌ID
- 7017400
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- 抄録ライセンスフラグ
- 使用不可