書誌事項
- タイトル別名
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- Hemispherical lens-shaped joints observed in the Narukawa Andesite, Nanae, Hokkaido
- ホッカイドウ カメダグン ナナエチョウサン ノ ナルカワ アンザンガン ニ ミラレル ハンキュウメン レンズジョウ セツリ
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説明
Extension joints with a peculiar shape of hemispherical lens were observed in the Narukawa Andesite, Nanae, Hokkaido. The size of the joints ranges from 5 to 46cm in diameter and from 0.7 to 2.4cm in depth. The occurrence of the hemispherical joints is restricted on the surface of platy and/or columnarjoints of the andesite lavas. The joint surface morphology is characterized by a plumose pattern, which is distinctive at the joint fringes. The hackle marks are also common around plagioclase megacrysts, which can be observed on the bottom of the hemispherical lenses. In some cases the jointing stays on the half ways, where the lenses remain on the platy surface of lavas. Taking all the modes of occurrence into considerations, the hemispherical lens-shaped joints are explained as extensional cracks initiated by a residual strain within individually jointed blocks of plates and/or columns in the andesite lavas.
収録刊行物
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- 地球科学
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地球科学 58 (3), 179-184, 2004
地学団体研究会
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詳細情報 詳細情報について
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- CRID
- 1390282679242068480
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- NII論文ID
- 110004860755
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- NII書誌ID
- AN00141269
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- ISSN
- 21897212
- 03666611
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- NDL書誌ID
- 6960762
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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
- CiNii Articles
- KAKEN
- Crossref
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- 抄録ライセンスフラグ
- 使用不可
