2012 Fiscal Year Final Research Report
Modeling of sediment-wave depositional facies
| Project/Area Number |
22540465
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Chiba University |
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Principal Investigator |
ITO Makoto 千葉大学, 大学院・理学研究科, 教授 (10201930)
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| Project Period (FY) |
2010 – 2012
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| Keywords | セディメントウェーブ / 海底谷 / 海底チャネル / フォーセット層理 / バックセッ ト層理 / 下流進行型アンティデューン / 高流領域 |
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| Research Abstract |
The present study aimed to clarify depositional processes of coarse-grained sediment-wave deposits on the basis of outcrop analyses. The deposits have (1) flute structures in the bases, (2) symmetrical form with the wave steepness of0.035-0.08, the wave length of 3-100 m, and the wave height of 0.2-2 m, (3) foreset, backset, and trough cross bedding, and (4) the waveforms were not the product of erosional processes. Consequently, the coarse-grained sediment-wave deposits are thought to have formed as downstream-migrating gravel antidunes that formed by waves at the interface between the denser bottom-flow and the less-dense upper flow within a turbidity current.
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