Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (2): 499-517.doi: 10.13278/j.cnki.jjuese.201602116

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Records of Holocene Sedimentation Environment and Relative Sea Level by the Boreholes Collected Along the Present Shoreline of the West Coast of Bohai Bay, China

Chen Yongsheng1,2, Li Jianfen1,2, Wang Fu1,2, Tian Lizhu1,2, Shang Zhiwen1,2, Shi Peixin1,2, Jiang Xingyu1,2, Wang Hong1,2   

  1. 1. Tianjin Centre, China Geological Survey, Tianjin 300170, China;
    2. Key Laboratory of Muddy Coast Geo-Environment, China Geological Survey, Tianjin 300170, China
  • Received:2015-05-16 Published:2016-03-26
  • Supported by:

    Supported by National Natural Science Foundation of China (41372173,41476074) and China Geological Survey (1212011120169,12120113005800)

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Abstract:

The three boreholes (NP3, CH110, and BT113) distribute from north to south along the west coast of Bohai bay. Through sampling the materials of the upper beds of the three cores deposited during Holocene, the authors analyze lithology, ages of AMS 14C, the assemblages of benthic foraminifera, and ostracoda to rebuild the Holocene sedimentation environment, and discuss the relative sea level changes quantificational. The results indicate that influenced by land-ocean interaction, the study area went through various stages of environmental development from swamp, tidal flat, shallow sea, prodelta, delta front to delta plain. At the beginning of Holocene, swamps developed in the mid to north parts of the study area; the south part, however, was exposed without deposition and unconformable contact with the underlying fluvial sediment deposited during Late Pleistocene. In Early Holocene, tidal flat developed overall with about 1m sediment only which took about several hundred years to more than a thousand years. Around 7000 cal BP, the sedimentation environment was transformed into shallow sea followed increasing water depth in Mid-Holocene, and at 6000 cal BP, changed into delta regime at north and south ends along the present shoreline. But, at mid of shoreline, delta regime began at 1500 cal BP. The environmental change in the west coast of Bohai bay reflects the relative sea level change in Holocene. At the beginning of Holocene, the relative sea level rose close to 21.3-20.4 m. At ca.8000 cal BP, the relative sea level was 18.6-17.0 m, and below 6.8 m at ca.6000 cal BP. At ca.5000-1000 cal BP, the relative sea level was above 2.5 m. It was between 1.3 m to 0.4 m during 1000-800 cal BP. During the period of 8000-5000 cal BP, the sea level rose about 15.0 m with a faster rate of 5 m/1 ka.

Key words: present shoreline of the west coast of Bohai bay, Holocene, sedimentation environment, relative sea level

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