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Tidally Modulated Storm Sedimentation on Open-Coast Tidal Flats, Southwestern Coast of Korea: Distinguishing Tidal-Flat from Shoreface Storm Deposits

By
Byongcheon Yang
Byongcheon Yang
Department of Geological Sciences and Geological Engineering, Queen’s University, Kingston, Ontario, K7L 3N6, Canada Present address: Department of Earth and Atmospheric Sciences, 126 Earth Sciences Building, University of Alberta, Edmonton, Alberta, T6G 2E3, Canada, e-mail: tidalite@hotmail.com
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Robert W. Dalrymple
Robert W. Dalrymple
Department of Geological Sciences and Geological Engineering, Queen’s University, Kingston, Ontario, K7L 3N6, Canada, e-mail: dalrymple@geol.queensu.ca
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Seungsoo Chun
Seungsoo Chun
Faculty of Earth Systems and Environmental Sciences, Chonnam National University, Kwangju 500-757, Korea, e-mail: sschun@jnu.ac.kr
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Michael F. Johnson
Michael F. Johnson
Department of Geological Sciences and Geological Engineering, Queen’s University, Kingston, Ontario, K7L 3N6, Canada Present address: National Energy Board, 444 7th. Avenue SW, Calgary, Alberta, T2P OX8, Canada, e-mail: mike.johnson@neb-one.gc.ca
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Heejun Lee
Heejun Lee
Marine Geology Laboratory, Korea Ocean Research and Development Institute, Ansan PO Box 29, Seoul 425-600, Korea, e-mail: heelee@kordi.re.kr
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Published:
January 01, 2008

Abstract

Observations of physical processes on the open-coast tidal flats along the southwestern coast of Korea show that tidal modulation of wave energy, as a result of changing water depth, produces composite storm beds that should be distinct from the classic storm beds that characterize wave-dominated shorefaces and shelves with small tides.

Storms (typhoons) during the low-energy summer generate muddy storm beds that superficially resemble the upward-thinning tidal rhythmites that form between spring and neap tides. Sandy, winter storm beds contain both falling-tide deposits that consist of decreasing-energy facies successions and rising-tide deposits that consist of increasing-energy facies successions. Over most of the tidal flat, bioturbation levels are low, even in the summer mud deposits, because of episodic high-energy conditions and high rates of sedimentation. Bimodal levels of bioturbation (negligible in the thin intra-storm, low-tide mud drapes versus more intense in inter-storm, fair-weather deposits) should characterize deposits formed on open-coast tidal flats. The style of bioturbation on the lower flat is similar to that reported from upper shorefaces, whereas the inner flat contains a mixed Skolithos-Cruziana assemblage that is much less diverse than that found in shelf deposits. These observations show that a spectrum of storm-bed types is to be expected between wave-dominated (i.e., shoreface and shelf) and tide-dominated (i.e., tidal-flat) settings.

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SEPM Special Publication

Recent Advances in Models of Siliciclastic Shallow-Marine Stratigraphy

Gray J. Hampson
Gray J. Hampson
Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
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Ronald J. Steel
Ronald J. Steel
Department of Geosciences, Jackson School, University of Texas at Austin, Austin, Texas 78712, U.S.A.
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Peter M. Burgess
Peter M. Burgess
Shell International Exploration and Production, Kessler Park 1, P.O. Box 60, 2280 AB Rijswijk, The NetherlandsPresent address: Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK
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Robert W. Dalrymple
Robert W. Dalrymple
Department of Geological Sciences and Geological Engineering, Queen’s University, Kingston, Ontario K7L 3N6, Canada
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SEPM Society for Sedimentary Geology
Volume
90
ISBN electronic:
9781565763180
Publication date:
January 01, 2008

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