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- 木川 栄一
- 地質調杏所海洋地質部 富山大学教育学部地球環境研究室
書誌事項
- タイトル別名
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- Magnetization of Oceanic Crust: The origin of the stripes.
- カイヨウ チカク ノ ジカ カイヨウ チジキ シマジョウ イジョウ ノ キゲン
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説明
The location of the magnetized rocks of the oceanic crust that are responsible for sea-floor spreading magnetic anomalies has been a long-standing problem in geophysics. The recognition of these anomalies was a keystone in the development of the theory of plate tectonics. Our present concept of oceanic crustal magnetization is much more complex than the original, uniformly magnetized model of Vine-Matthwes-Morley. Magnetic inversion studies indicated that the upper oceanic extrusive layer (layer 2A, 0.5 km thick) was the only magnetic layer and that it was not necessary to postulate any contribution from deeper parts of oceanic crust. Direct measurements of the magnetic properties from the sea floor, however, have shown that (i) the magnetization of layer 2A is insufficient to give the required size of observed magnetic anomalies and (ii) some contribution from lower intrusive rocks is necessary. Recent ODP studies reported high magnetization intensities in the gabbroic rocks and the peridotites. The source of the lineated magnetic anomalies must reside in most of the oceanic crust and in the upper portion of upper mantle.
収録刊行物
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- 地学雑誌
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地学雑誌 104 (3), 381-391, 1995
公益社団法人 東京地学協会
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詳細情報 詳細情報について
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- CRID
- 1390001204230274304
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- NII論文ID
- 10002232762
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- NII書誌ID
- AN00322536
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- ISSN
- 18840884
- 0022135X
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- NDL書誌ID
- 3609860
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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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