書誌事項
- タイトル別名
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- Drifting Pumice Clasts Derived from Ulleung Island in Early Holocene Sediments at Oda, Shimane Prefecture, Southwestern Japan.
- シマネケン オオダシ ノ クッサク コア カラ ハッケンサレタ ウツリョウトウ
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抄録
A 2cm-thick pumice layer (Hane pumice bed) occurred within Early Holocene sediments at a depth of -13.6m in drill core samples from Lake Hane, east of Oda City, Shimane Prefecture. The pumice layer lies below the Kikai Akahoya tephra (6, 300 years BP). The pumice is trachytic in composition, consisting of glass, sanidine, clinopyroxene, kaersutite, biotite, and a small amount of plagioclase. Based on comparison of the chemical compositions of whole rock, glass, and constituent minerals from pumices from Ulleung Island, and the widespread Late Quaternary tephra of the San'in region, it is concluded that the Hane pumice is correlative with the lower part of the U-4 tephra at Ulleung Island. This occurs below the Ulleung-Oki tephra (U-Oki), which is dated at 9, 300 years BP. The sedimentary succession in which the pumice bed is intercalated becomes finer in an upward direction, indicating transgression in the early Holocene. Therefore, the age of the pumice is less than 10Ka BP. On the basis of the mode of occurrence of the Hane pumice and its sedimentary environment, it is not an air fall deposit, but was transported by an ocean current from Ulleung Island, about 300km distant from Hane. The pumice, which drifted ashore and was deposited, is important to the understanding of sea level change, since the occurrence gives a record of the paleo-sea level and currents in the area.
収録刊行物
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- 第四紀研究
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第四紀研究 36 (1), 1-16, 1997
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
- 1390282681472441728
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- NII論文ID
- 10002634337
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- NII書誌ID
- AN0034136X
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- ISSN
- 18818129
- 04182642
- http://id.crossref.org/issn/04182642
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- NDL書誌ID
- 4159549
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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
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- 抄録ライセンスフラグ
- 使用不可