書誌事項
- タイトル別名
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- Paleomagnetic Method Applied to a Suspected Deformed Sedimentary Layer Exposed at Oki Trench Site at the Agematsu Fault in Nagano Prefecture, Central Japan
- アゲマツ ダンソウ オオキ チク トレンチ ニ シュツゲンシタ ケイシャソウ ノ セイイン ニ カンスル コチジキガクテキ シュホウ ニ ヨル ケントウ
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説明
A paleomagnetic method was applied to decipher the origin of a dipping layer of the Agematsu fault at Oki trench sites (Si, S2). In S1 and S2 trenches, a sedimentary layer dipping up to 40 degrees was observed on the slope of bulge. It was discussed if the origin of dipping layer was due to tectonic deformation or to primary sedimentary structure. Oriented samples were collected from the same stratigraphic horizon. Alternating field (AF) demagnetization revealed that the remanent magnetization was divided into the stable primary component and the secondary component that could be cleaned by demagnetization at low AF levels. The primary component was estimated to be of DRM origin from low Qratio and high ARM/NRM ratio. The origin of dips of the sedimentary layer is considered to be primary sedimentary structure, because the scatter of the directions of remanent magnetization after the tilt correction is larger than that before the correction. There were large differences in the mean directions and the scatters of the secondary components between S1 and S2 trenches. In S2 trench, the secondary component showed less scatter than primary component and eastward deflection. The secondary component of S1 was regarded as VRM. There is a possibility that the origin of the secondary component in the S2 trench is due to lightning-induced remanent magnetization.
収録刊行物
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- 応用地質
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応用地質 48 (1), 27-34, 2007
一般社団法人 日本応用地質学会
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詳細情報 詳細情報について
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- CRID
- 1390282679071130752
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- NII論文ID
- 110006277230
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- NII書誌ID
- AN00026635
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- ISSN
- 18840973
- 02867737
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- NDL書誌ID
- 8788324
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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
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可
