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Li Congxian, Zhang Gui jia, Li Tiesong. Rhythms of Tidal Flat Sedimentation and Cyclisity of Affecting Factors[J]. Acta Sedimentologica Sinica, 1995, 13(S1): 71-78.
Citation: Li Congxian, Zhang Gui jia, Li Tiesong. Rhythms of Tidal Flat Sedimentation and Cyclisity of Affecting Factors[J]. Acta Sedimentologica Sinica, 1995, 13(S1): 71-78.

Rhythms of Tidal Flat Sedimentation and Cyclisity of Affecting Factors

  • Publish Date: 1995-12-10
  • Tidalites in Zhejiang Ordovician System and the recent and subrecent tidal flat deposits in the Yangtze delta are studied,utilizing the method commonly-used abaord for tide-channel and tide-flat research.The tide-flat laminae and micro-sequences are measured, and the results are analyzed by time-series analytical method to achieve "spring-neap tidal cycles". Consequently, the sedimention rate on the tidal flats is calculated to be 3. 0-4. 5m/a. However, the sedimention rate, speculated from the sea-walls built in various ages in the Yangtze Delta and measured by Ph21o, is only 2. 2-4. 0cm/a. The former is approximately one hundred times greater than the latter.Sedimentary observation on modern tidal flat show that, laminae and micro-sequences are formed by changing of current velosity during single tidal cycle; whereas, single layer and small-sequences in tidal flat sediments are the results of the intercourse of storm and calm weathers. The laminae can be eroded and destroyed by ensuing strong tidal currents,and the small-sequences can be reworked by ensuing strong storm waves. Statistical data show that the number of preserved laminae and micro-sequences is less than 10% of the experienced cycles; and the nmuber of the preserved single layer and small-sequences is less than 10% of the experienced storms. This asymmetry betweent the preserved rhythms and the cycles of the affecting factors in the basic reason for the error in speculating sedimentary rates from the sedimention rhythms on the tidal flats.Sedimentation on tidal flats in mainly vertical aggradation, while in tidal channels is mainly lateral deposition. Erosion can eliminate the tide-flat rhythms. However, the tide-channel rhythms can be eroded also, but the number of the rhythms remains unchanged. Therefore, the method of calculating sedimentation duration and sedimention rate,developed from the concepts of the "tidal bundle" and "spring-neap tidal cycle" in tidal channels, is inapplicable to tidal flat sediments.
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    3.Boesma, J. R. and Terwindt, J. H. J.,1981,Neap一spring tide sequences of intertidal shoal deposits in a mega一tidal estuary. Sedimentology. 28s151一170.

    4.Allen, P, and Homewood, P.,1984, Evolution and mechanics of a Miocene tidal sand一wave, sedimentology. 31:63一 81.

    5.de Boer, P. L.,Oost, A. P. and Visser, M. J.,1989, The diurnal inequality of the tide as a parameter for recognizing tidal influences, J. Sediment. Petrlo.,59(6):912一921.

    6.Dalrymple, R. W.,Makino, Y. and Zailtin, B. A.,1990, Timporal and spatial patterns of mud flat sedimentation in a macrotidal esyuary, Cobequid Bay一Salmon River Estuary. In, D. G. Smith. G. E. Rienson and B. A. Zaitlin (Editors).

    7.Kuecher, G. J.,Woodland ,tidal cycles from the Francis B. G. and Broasthurat, F. M.,1990, Evidence of deposition from individual tides and of Creek Shale (host rock to the Mazon Creek Biota). Westphallian D (Pennsylvanian),nothereastern Illinois. Sediment. Geol.,68:211一221.

    8.Kvale, E. O.,Aecher. A. W. and Johnson, H. R.,1989, Daily, monthly and yearly tidal cycles within laminated silt-stones of the Mansfiedld Formation (Pennsylvarian) of Indiana, Geology. 17,365一368.

    9.Kvale, E. O. and Archer, A. W:,1990, Tidal deposits associated with low一sulfur coals. Brazil FM. (Lower Pennsyl-vanian). Indiana. J. Sediment. Petro.,60(4),563一574.

    10.Terwindt, J. H. J.1988, Paleotidal reconstructions of inshore tidal depositional Nio (Editor). Tidal一Influenced Sedimentary Environmentsenvironments. In: P. L. de Bier. A.van Gelder and S. D.and Facies. Reidel, Dordrecht, p. 23一263.

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  • Published:  1995-12-10

Rhythms of Tidal Flat Sedimentation and Cyclisity of Affecting Factors

Abstract: Tidalites in Zhejiang Ordovician System and the recent and subrecent tidal flat deposits in the Yangtze delta are studied,utilizing the method commonly-used abaord for tide-channel and tide-flat research.The tide-flat laminae and micro-sequences are measured, and the results are analyzed by time-series analytical method to achieve "spring-neap tidal cycles". Consequently, the sedimention rate on the tidal flats is calculated to be 3. 0-4. 5m/a. However, the sedimention rate, speculated from the sea-walls built in various ages in the Yangtze Delta and measured by Ph21o, is only 2. 2-4. 0cm/a. The former is approximately one hundred times greater than the latter.Sedimentary observation on modern tidal flat show that, laminae and micro-sequences are formed by changing of current velosity during single tidal cycle; whereas, single layer and small-sequences in tidal flat sediments are the results of the intercourse of storm and calm weathers. The laminae can be eroded and destroyed by ensuing strong tidal currents,and the small-sequences can be reworked by ensuing strong storm waves. Statistical data show that the number of preserved laminae and micro-sequences is less than 10% of the experienced cycles; and the nmuber of the preserved single layer and small-sequences is less than 10% of the experienced storms. This asymmetry betweent the preserved rhythms and the cycles of the affecting factors in the basic reason for the error in speculating sedimentary rates from the sedimention rhythms on the tidal flats.Sedimentation on tidal flats in mainly vertical aggradation, while in tidal channels is mainly lateral deposition. Erosion can eliminate the tide-flat rhythms. However, the tide-channel rhythms can be eroded also, but the number of the rhythms remains unchanged. Therefore, the method of calculating sedimentation duration and sedimention rate,developed from the concepts of the "tidal bundle" and "spring-neap tidal cycle" in tidal channels, is inapplicable to tidal flat sediments.

Li Congxian, Zhang Gui jia, Li Tiesong. Rhythms of Tidal Flat Sedimentation and Cyclisity of Affecting Factors[J]. Acta Sedimentologica Sinica, 1995, 13(S1): 71-78.
Citation: Li Congxian, Zhang Gui jia, Li Tiesong. Rhythms of Tidal Flat Sedimentation and Cyclisity of Affecting Factors[J]. Acta Sedimentologica Sinica, 1995, 13(S1): 71-78.
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