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Science in China Series D: Earth Sciences

, Volume 42, Issue 1, pp 52–60 | Cite as

Characteristic and paleoenvironmental evolution of subaerial tidal sand body in Subei coastal plain

  • Congxian Li
  • Jiaqiang Zhang
  • Shouye Yang
  • Daidu Fan
Article

Abstract

The subaerial tidal sand area in the northern Jiangsu Province (Subei), stretching from Dongtai towards east with a fan shape, is an early developing stage of radial sand ridges distributed in the South Yellow Sea. Since 5000–6000 a BP, after the Holocene transgression maximum in the northern Jiangsu Province, subaqueous tidal sand bodies were exposed and changed into land gradually. The environmental magnetism analysis shows that subaerial tidal sand strata are formed by the convergent-divergent paleo-tidal current field. The sediment source of tidal sand strata came early from the Changjiang River and late from the Yellow River. Sea floor erosion by tidal currents also served as an important sand source. Drilling cores and ground-penetrating profile show that there exists no probability of sand supplying directly by a large river through the apical area of tidal sand ridges either on land or in the sea. Fluvial deposits supplied the tidal sand bodies by alongshore transportation, which corresponds to the conclusions obtained by the analyses of provenance and paleocurrent field.

Keywords

Subei coastal plain tidal sand bodies paleo-tidal current field paleoenvironment 

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Copyright information

© Science in China Press 1999

Authors and Affiliations

  • Congxian Li
    • 1
  • Jiaqiang Zhang
    • 1
  • Shouye Yang
    • 1
  • Daidu Fan
    • 1
  1. 1.Laboratory of Marine GeologyState Education CommissionShanghaiChina

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