書誌事項
- タイトル別名
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- Geology of Katsuyama-Osakabe Area, Okayama Prefecture, Southwest Japan: Chaotic Rock Bodies Originated by Sedimentary and Diapiric Processes
- オカヤマケン カツヤマ-ケイブ チイキ ノ チシツ : タイセキセイ オヨビ ダイアピル キゲン ノ コンザイガン
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On the basis of the results of field surveying and microstructural study, we describe here the occurrence of chaotic rocks formed by diapiric processes, and the structural relationships between the Ohsayama serpentinite mélange, the Permian olistostrome, and the Sangun metamorphic rocks. The Ohsayama serpentinite mélange is distributed in the Osakabe area and was defined by Tsujimori (1998) as a tectonic mélange with a serpentinite matrix. It contains blueschist-facies schists with a metamorphic age (320 Ma) older than that of the Sangun metamorphic rocks (180 Ma), and is traceable to the north of the Permian olistostrome. The Permian olistostrome is distributed in the Katsuyama area and consists of submarine sliding deposits with mudstone, sandstone, alternating beds of sandstone and mudstone, and limestone blocks. In addition to these rocks, we newly found chaotic rocks of diapiric origin. These chaotic rocks are characterized by a predominant mud matrix and non-sorted clasts with sizes ranging from 1 mm to more than 10 m. The distribution of the chaotic rock body cuts the bedding planes of the other strata at a high angle. The clasts have irregular shapes, a zigsaw-puzzle structure, and disaggregated wisps. These features indicate that the clasts were broken and driven upward by overpressured fl uids. The Sangun metamorphic rocks, which are of a high pressure type and commonly show three generations of foliation, underlie both the Ohsayama serpentinite mélange and Permian olistostrome with a fault contact and form syncline trending E-W and plunging 7°to west at the northeast part of the surveyed area.
収録刊行物
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- 広島大学大学院総合科学研究科紀要. II, 環境科学研究
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広島大学大学院総合科学研究科紀要. II, 環境科学研究 13 19-39, 2018-12-31
広島大学大学院総合科学研究科
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詳細情報 詳細情報について
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- CRID
- 1390290699835564416
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- NII論文ID
- 120006591464
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- NII書誌ID
- AA12198658
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- ISSN
- 18817696
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- DOI
- 10.15027/47115
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- NDL書誌ID
- 029573832
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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
- IRDB
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用可