Quaternary transgressive and regressive depositional sequences in the East China Sea

Liu, Zhenxia; Yin, Ping; Xiong, Yihui; Berné, Serge; Trentesaux, Alain; Li, Chaoxin

doi:10.1007/bf02900944

“…This is consistent with the conditions of abundant fine-grained sediment supply and tidal dominance of the region (Gao (1988); Z. X. Liu et al (1998Liu et al ( , 2000Liu et al ( , 2003; Saito et al 2009a). In areas of small river inputs, in contrast, tidal flats are either located in well-sheltered embayments or in estuarine bay head areas along the coastline of Europe (e.g.…”

Section: Tidal Flatssupporting

confidence: 83%

Holocene sedimentary systems on a broad continental shelf with abundant river input: process–product relationships

Gao

¹

,

Wang

²

,

Yang

³

et al. 2016

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The region consisting of the Bohai, Yellow and East China seas represents a typical wide continental shelf environment with abundant terrestrial sediment supply. Here, a variety of sedimentary systems have been formed during the Holocene period. These systems have unique characteristics in terms of spatial distribution, material composition, deposition rate, and the timing and duration for their formation, which are related to active sediment-transport processes induced by tides and waves, shelf circulations, and sediment gravity flows. The sedimentary records contained within the deposits have a high temporal resolution, but each with a limited temporal coverage. However, if these records are connected, then they may form a complete archive for environmental change studies. In the field of process-product relationship studies, the mid-Holocene coastal deposits on the Jiangsu coast, the early-middle Holocene sequences of the Hangzhou Bay, the Holocene mud deposits off the Zhejiang-Fujian coasts and the other mud areas over the region are of importance. These systems may be understood by identifying the material supply (from both seabed reworking during the sea-level rise events and river discharges), transportaccumulation processes, the formation of sediment sequences and the future evolution of the sediment systems, for which numerical modelling becomes increasingly important.

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“…The sand ridges had developed on the existing continental sediment and were partly reworked, or existed during low sea-level period (former sand ridges) and expanded during sea-level rise with similar tidal current condition, the only difference of which is scale. This model resulted in erosional sand ridges [33] or depositional-erosional sand ridges [19] . In model B, sand ridges are completely developed during sea-level rise, and continental deposition formed an active transferring sand layer under tidal current.…”

Section: Evolution Models Of the Sand Ridgesmentioning

confidence: 99%

“…Deposits were eroded and turned up to form ridge under steady condition of water depth and reciprocating currents. This model resulted in depositional sand ridges [19] . Based on Huthnance's mathematical model [38,39] , Snedden [55] suggested 3 stages of sand ridge evolution (Fig.…”

Section: Evolution Models Of the Sand Ridgesmentioning

confidence: 99%

“…Based on single channel seismic profiles obtained during the Chinese-French joint cruise in 1996, tidal sand ridges buried in the sediment layers on the continental shelf of the ECS have been well studied [18,19,26,27,33] . In this paper, seismic profiles close to the multi-beam study area and boreholes and cores are selected to combine multibeam sounding data with lithology analysis to do further research.…”

Section: Internal Structures Of the Linear Sand Ridgesmentioning

confidence: 99%

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Linear sand ridges on the outer shelf of the East China Sea

Wu¹,

Ziyin²,

Jin³

et al. 2005

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Based on the latest full-coverage high-resolution multi-beam sounding data, the distribution of the linear sand ridges on the outer shelf of the East China Sea (ECS) is studied with quantitative statistical analysis. The study area can be divided into the northeastern part and the southwestern part. Sand ridges in the northeastern area, trending 116°N, show obvious linear character and shrink to the inner shelf. Sand ridges in the southwestern area, trending 120°N -146°N, tend to have net form. Sand ridges gradually become sand sheets in the center part of study area. Sand ridges are distributed landward to the isobath of 60m, distributed seaward to the water depth of 120 m in the northeast and 150 m in the southwest. Immature sand ridges are observed at water depth of 130-180 m in the southwestern depressions. The acoustic reflection properties of the internal high-angle inclined beddings of the sand ridges are analyzed based on the typical seismic profiles close to the research area. Lithological analysis and dating of 4 boreholes and 12 cores indicate that the widely distributed transgressive sand layer with high content of shell debris which was formed in the early-middle Holocene is the main composition of the linear sand ridges on the outer shelf of the ECS. The dominating factor in formation, developing and burying of the sand ridges is the variation of water depth caused by sealevel change and the rate of sediment supply. In 12400 aBP the cotidal lines of the M 2 tidal component were closely perpendicular to the strike-directions of the sand ridges in the study area, and the tidal wave system during 12000-8000 aBP might play a key role in the formation of the linear sand ridges which are widely distributed on the outer shelf of the ECS.Off [1] first noticed the huge rhythmic linear submarine topography that widely distributed on the wave-dominated continental shelves in 1963 and named it linear sand bodies, and considered that such underwater topography which alternated between ridge and trough was caused by tidal currents. Later studies proved that the reciprocating tidal-current with certain speed and ellipticity is the dominant force that causes the formation of linear sand ridges, so it is usually called the tidal sand ridges. Since then, studies on the linear sand ridges have covered the wave-dominated continental shelves all over the world. Domestic researches began in the early 1980s to study the formation of radiant sand ridges in Jianggang, Jiangsu [2][3][4][5][6][7] . Later, such linear topography was found in the offshore areas, the Yellow Sea, the Bohai Sea, the inner shelf of the East China Sea(ECS), estuaries, some straits and channel-outlets. After 20 years' study, plentiful results were achieved by Chinese scientists, and a series of papers on tidal sand ridges, tidal wave system and tidal deposits of the eastern China seas have been published by worldfamous publishing houses [16 -18,30 -37] since late 1990s. However, most studies were focused on the Yellow Sea, the Bohai Sea, the offsho...

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“…9). This model resulted in depositional sand ridges [19] . The sand ridges had developed on the existing continental sediment and were partly reworked, or existed during low sea-level period (former sand ridges) and expanded during sea-level rise with similar tidal current condition, the only difference of which is scale.…”

Section: Evolution Models Of the Sand Ridgesmentioning

confidence: 99%

Linear sand ridges on the outer shelf of the East China Sea

Wu

¹

,

Jin

²

,

Li

³

et al. 2005

View full text Add to dashboard Cite

Based on the latest full-coverage high-resolution multi-beam sounding data, the distribution of the linear sand ridges on the outer shelf of the East China Sea (ECS) is studied with quantitative statistical analysis. The study area can be divided into the northeastern part and the southwestern part. Sand ridges in the northeastern area, trending 116°N, show obvious linear character and shrink to the inner shelf. Sand ridges in the southwestern area, trending 120°N -146°N, tend to have net form. Sand ridges gradually become sand sheets in the center part of study area. Sand ridges are distributed landward to the isobath of 60m, distributed seaward to the water depth of 120 m in the northeast and 150 m in the southwest. Immature sand ridges are observed at water depth of 130-180 m in the southwestern depressions. The acoustic reflection properties of the internal high-angle inclined beddings of the sand ridges are analyzed based on the typical seismic profiles close to the research area. Lithological analysis and dating of 4 boreholes and 12 cores indicate that the widely distributed transgressive sand layer with high content of shell debris which was formed in the early-middle Holocene is the main composition of the linear sand ridges on the outer shelf of the ECS. The dominating factor in formation, developing and burying of the sand ridges is the variation of water depth caused by sealevel change and the rate of sediment supply. In 12400 aBP the cotidal lines of the M 2 tidal component were closely perpendicular to the strike-directions of the sand ridges in the study area, and the tidal wave system during 12000-8000 aBP might play a key role in the formation of the linear sand ridges which are widely distributed on the outer shelf of the ECS.

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Quaternary transgressive and regressive depositional sequences in the East China Sea

Cited by 13 publications

References 7 publications

Holocene sedimentary systems on a broad continental shelf with abundant river input: process–product relationships

Holocene sedimentary systems on a broad continental shelf with abundant river input: process–product relationships

Linear sand ridges on the outer shelf of the East China Sea

Linear sand ridges on the outer shelf of the East China Sea

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