Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (5): 1460-1469.doi: 10.13278/j.cnki.jjuese.201505117

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Stratigraphic and Paleo-Environmental Evolution of Liaodong Bay Since Late Pleistocene: Evidence from Core LDD7

Sun Rongtao1, Zhao Jingtao2,3, Li Jun2,3, Hu Bangqi2,3   

  1. 1. School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255049, Shandong, China;
    2. Key Laboratory of Marine Hydrocarbon Resources and Environment Geology, Ministry of Land and Resources, Qingdao 266071, Shandong, China;
    3. Qingdao Institute of Marine Geology, Qingdao 266071, Shandong, China
  • Received:2014-12-21 Published:2015-09-26

Abstract:

The benthic foraminifera and ostracoda faunas in 300 samples and the sediment grain sizes in 196 samples of a 50.1 m-long sediment core (LDD7) from the middle area of Liaodong bay are analyzed to document the stratigraphy and reconstruct the environmental evolution during Late Pleistocene. In addition,14C dating of the benthic foraminifera from 8 layers is analyzed using accelerator mass spectrometry to establish the accurate chronostratigraphic framework of the core. It is showed that the central area of Liaodong bay maintained a relatively continuous sedimentary sequence during Late Pleistocene. Core LDD7 recorded the sedimentary environment evolution of the last 60.85 cal.ka. Based on the result, 9 depositional units (U1 to U9 in descending order) in core LDD7 are identified. These units are interpreted as marine facies, continental facies, or transitional facies in the different stages of the Late Pleistocene glacial cycles in the central region of Liaodong bay. By correlation with other well-studied cores in the nearby area,two transgressive layers of Core LDD7 are in agreement with Xianxian transgression and Huanghua transgression, of which the durations of 45.84-27.66 cal.kaBP and 10.64-0 cal.kaBP are detected. Besides, the average subsidence rate and deposition rate in the middle part of Liaodong bay show values significantly lower than those in the south area after Xianxian transgression based on this study; however, the deposition rate in the middle part was higher than that in the south area during Xianxian transgression process.

Key words: Liaodong bay, micro fossils, transgression layer, paleo-environmental evolution, AMS14C dating, depositional sequence

CLC Number: 

  • P736.2

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