Yangtze offshore, China: Highly laminated sediments from the transition zone between subaqueous delta and the continental shelf

Zhanghua Wang, Yoshiki Saito, Kazuaki Hori, Akihisa Kitamura, Zhongyuan Chen

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

This study examines the deposition of highly laminated muddy sediment in vibrocores recovered from a depth of 40-55 m of water and located 120 km east of the Yangtze River mouth. X-radiographs show numerous sharp-based sedimentary rhythmics with nearly parallel and undulated laminations, interbedded with silty lenses and interbeds. The laminated sediment varies from clayey silt to silty clay. AMS radiocarbon dates on well-preserved bivalves are primarily younger than 5500 y BP, indicating the formation of the laminated sediment under the present sea-level conditions. Macro- and microfossils in the sediments are consistent with the modern offshore sedimentary setting. The laminated sediment originated from the Yangtze estuary, but the sedimentation processes were not deltaic. The highly laminated sediment that lies below the normal wave base of 10 m was deposited on the seaward margin of the Yangtze subaqueous delta, closely associated with submarine tidal and storm-generated currents.

Original languageEnglish
Pages (from-to)161-168
Number of pages8
JournalEstuarine, Coastal and Shelf Science
Volume62
Issue number1-2
DOIs
Publication statusPublished - 2005 Jan
Externally publishedYes

Keywords

  • Yangtze offshore
  • highly laminated sediment
  • storm-generated sedimentation
  • submarine tidal current
  • transition zone

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

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