書誌事項
- タイトル別名
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- Rock Magnetic Study of Holocene Marine Sediments Recovered from the Okhotsk Sea: Study of Two Core Sediments Near Kitamiyamato Bank off Abashiri, Hokkaido
- オホーツクカイ カンシンセイ タイセキブツ ノ ガンセキ ジキガクテキ ケンキュウ ホッカイドウ アバシリオキ キタミ ヤマトタイシュウヘン デ サイシュ サレタ 2ホン ノ コア シリョウ
- Study of Two Core Sediments Near Kitamiyamato Bank off Abashiri, Hokkaido
- 北海道網走沖北見大和堆周辺で採取された2本のコア試料
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抄録
Marine sediment formed at a high sedimentation rate is distributed in the Okhotsk Sea, off Abashiri, Hokkaido. In order to make a detailed study of environmental changes in the area, we applied rock magnetic methods to two gravity cores covering 2, 700yrs (sediment rate about 150cm/yrs), GH00-1001 (water depth 461m) and GH00-1006 (water depth 1, 348m), recovered from the northern and southern basins near Kitamiyamato Bank. The dominant magnetic mineral in both cores is magnetite. A variety of rock magnetic parameters show three types of downcore variation, which are spiky anomalies suggesting the presence of volcanic ash and basaltic granules. Stepping down of the parameters indicates chemical change in a sedimentary environment, and the rather broad peaks suggest changes in the origin of detrital grains. Based on magnetic parameters, we also magnetically illustrated that increase in grain-size below -300cm (GH00-1001) and -150cm (GH00-1006) is a result of the dissolution of the fine part of magnetic grains in a reducing environment. Magnetic parameters are sensitive enough to pinpoint an episodic input of detrital material of different grain size and mineralogy at 275cm and 420cm (GH00-1001), which corresponds to the Kofun cold age (AD246-732).
収録刊行物
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- 第四紀研究
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第四紀研究 42 (2), 83-97, 2003
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
- 1390001206496456832
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- NII論文ID
- 130001563471
- 10023994915
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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
- 6539501
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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
