Time correlation between MIS5a transgression and global sea level change of the second Marine layer in the coastal lowland of Bohai Bay

CHEN Yongsheng; HU Yipan; JIANG Xingyu; LI Jianfen; SHANG Zhiwen; FANG Jing; WANG Fu

doi:10.12029/gc20210328001

2024 Vol. 51, No. 6

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CHEN Yongsheng, HU Yipan, JIANG Xingyu, LI Jianfen, SHANG Zhiwen, FANG Jing, WANG Fu. 2024. Time correlation between MIS5a transgression and global sea level change of the second Marine layer in the coastal lowland of Bohai Bay[J]. Geology in China, 51(6): 2056-2065. doi: 10.12029/gc20210328001

Citation:

CHEN Yongsheng, HU Yipan, JIANG Xingyu, LI Jianfen, SHANG Zhiwen, FANG Jing, WANG Fu. 2024. Time correlation between MIS5a transgression and global sea level change of the second Marine layer in the coastal lowland of Bohai Bay[J]. Geology in China, 51(6): 2056-2065. doi: 10.12029/gc20210328001

Time correlation between MIS5a transgression and global sea level change of the second Marine layer in the coastal lowland of Bohai Bay

1.
Tianjin Centre, China Geological Survey, Tianjin 300170, China
2.
Key Laboratory of Coast Geo−environment, China Geological Survey, CGS, Tianjin, 300170, China
3.
Tianjin Key Laboratory of Coast Geological Processes and Environmental Safety, Tianjin 300170, China
4.
Key Laboratory of Marine Resources of Hubei Province, China University of Geosciences, Wuhan 430000, Hubei, China
5.
College of Urban and Environmental Science, Tianjin Normal University, Tianjin 300387, China

Fund Project: Supported by the National Natural Foundation of China (No.41372173, No.41806109) and the projects of China Geological Survey (No.DD20189506, No. DD20211301).

More Information

Author Bio: CHEN Yongsheng, female, born in 1975, Ph.D., senior engineer, engaged in Quaternary coastal geological environment changes research; E-mail: cyongsheng@mail.cgs.gov.cn
Corresponding author: WANG Fu, male, born in 1979, Ph.D., researcher, engaged in geological environment changes of the Quaternary coastal zone research; E-mail: wfu@mail.cgs.gov.cn.

Received Date: 28 March 2021

Revised Date: 27 June 2021

Publish Date: 25 November 2024

Abstract

Abstract

This paper is the result of coastal geological survey engineering.
Objective
The second marine layer in the coastal lowland of Bohai Bay remains controversial, which restricts the progress of sea level change research in this area. This study performs optically stimulated luminescence dating on this layer, expecting to calibrate the precise stratigraphic age and the corresponding marine transgression episodes.
Methods
By taking the CZ80, CZ85, and CZ66 boreholes on the west coast of the Bohai Bay as the research targets, based on the examination of sedimentary structures, textures and foraminifera abundance in the cores and sedimentary microfacies, the second marine layer was identified, and a comparative profile of the second marine layer was constructed. The formation age of this layer was precisely determined through the optically stimulated luminescence dating method, and the relationship between the development duration of the second marine layer and global sea level changes was further explored.
Results
The CZ80, CZ85, and CZ66 boreholes all intersected the second marine layer beneath the Holocene stratum (including the first marine layer). The base of the marine layer was embedded at a depth ranging between 35 and 33 meters, corresponding to the elevation ranging from −31.13 to −28.39 meters in the Yellow Sea. The top of the marine layer was buried within a depth range of 32 to 20 meters, with an elevation varying from −25.58 to −15.39 meters. The optically stimulated luminescence dating outcomes reveal that the occurrence time of the marine transgression event corresponding to the second marine layer was approximately 94 to 71 ka.
Conclusions
The optically stimulated luminescence (OSL) dating outcomes reveal that the second marine layer in this region commenced at 94 ka or earlier, and the influence of seawater terminated approximately 71 ka ago. Through comparison with the global sea−level curve, the spatio−temporal attributes of the second marine layer are consistent with the MIS5a stage, chronicling the marine transgression event during the MIS5a stage.
- MIS5a transgression /
- global sea level change /
- Optically Stimulated Luminescence (OSL) dating /
- the second marine layer /
- Bohai Bay /
- coastal geological survey engineering

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References

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