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- 松浦 旅人
- 日本工営株式会社四国事務所
書誌事項
- タイトル別名
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- A Late Pleistocene Tephra Layer Containing Biotite and Cummingtonite in the Northern Part of Yamagata Prefecture, Northeast Japan.
- ヤマガタケン ホクブ ニ ブンプ スル コウキ コウシン セイ ノ ガン クロウンモ カミングトンセンセキ テフラ
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説明
Dokusawa tephra (Dks) is distributed in the northern part of Yamagata Prefecture, Northeast Japan. This study clarifies its petrographic properties, stratigraphic position, and distribution. It also discusses the locations of source vents and the eruptive age of Dks, and suggests a tentative correlation of Dks with specific tephra distributed in neighboring regions. The conclusions are as follows.<br>1. Dks is distinguished by its phenocristic biotite and cummingtonite.<br>2. The refractive index of volcanic glass (n) is 1.495-1.498, and that of cummingtonite (n2) is 1.665-1.671.<br>3. The mg-value of cummingtonite is 0.571-0.568.<br>4. The eruptive age of Dks is estimated as a bit later than 100ka because Dks is just above the Sanbe Kisuki tephra (100ka).<br>5. A source vent of Dks is presumably situated in the Hijiori caldera-Mt. Gassan-Mt. Hayama triangle or to its southwest, based on the Dks isopach.<br>6. Dks may correlate with Kitahara tephra (Kth) in the northern part of Miyagi Prefecture, because properties of Dks are quite similar to those of Kth.
収録刊行物
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- 第四紀研究
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第四紀研究 39 (2), 165-170, 2000
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
- 1390001206496966016
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- NII論文ID
- 10004720311
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- NII書誌ID
- AN0034136X
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- ISSN
- 18818129
- 04182642
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- NDL書誌ID
- 5333596
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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
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
