Characteristics of Palaeoenvironmental Evolution in the Shasan-Shasi Section of the Chexi Depression in the Bohai Bay Basin

LIU Jie; LI Min; CHEN Pan-Pan; LI Cun-Lei; DUAN Chang-Jiang; WANG Bao-Chun; XIA Xiao-Duo; MENG Long-Qi

doi:10.3969/j.issn.2097-0013.2025.01.011

2025 Vol. 41, No. 1

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Article navigation > South China Geology > 2025 > 41(1): 136-147

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LIU Jie, LI Min, CHEN Pan-Pan, LI Cun-Lei, DUAN Chang-Jiang, WANG Bao-Chun, XIA Xiao-Duo, MENG Long-Qi. 2025. Characteristics of Palaeoenvironmental Evolution in the Shasan-Shasi Section of the Chexi Depression in the Bohai Bay Basin. South China Geology, 41(1): 136-147. doi: 10.3969/j.issn.2097-0013.2025.01.011

Citation:

LIU Jie, LI Min, CHEN Pan-Pan, LI Cun-Lei, DUAN Chang-Jiang, WANG Bao-Chun, XIA Xiao-Duo, MENG Long-Qi. 2025. Characteristics of Palaeoenvironmental Evolution in the Shasan-Shasi Section of the Chexi Depression in the Bohai Bay Basin. South China Geology, 41(1): 136-147. doi: 10.3969/j.issn.2097-0013.2025.01.011

Characteristics of Palaeoenvironmental Evolution in the Shasan-Shasi Section of the Chexi Depression in the Bohai Bay Basin

1.
Liaoning University of Petroleum and Chemical Technology, Fushun 113005, Liaoning, China
2.
Xi'an Engineering Investigation & Design Research Institute of China National Nonferrous Metals Industry Co., Ltd., Xi'an 710054, Shanxi, China
3.
CNOOC EnerTech-Drilling & Production Co., Tianjin 300452, China

Received Date: 19 August 2024

Revised Date: 03 December 2024

Publish Date: 20 March 2025

Abstract

Abstract

Due to the untypical features and comparatively smaller scale, previous studies on gravity flow deposits in shallow marine shelf areas are mostly limited to simple descriptions, so the understanding of their sedimentary characteristics and genesis mechanisms is not sufficient, and the main controlling factors and mechanisms affecting their development are not known. In this paper, the gravity flow deposits of the Shasan-Shasi section in Chexi Depression, Bohai Bay Basin have been studied, the palaeoenvironmental conditions and depositional patterns affecting the developmental characteristics of gravity currents in the Shasan-Shasan section of the Chexi Depression has been analyzed, and geological significance has been further discussed. The palaeoclimate index C and the Fe/Mn index of the Shasan-Shasi section sediments in Chexi Depression indicate that during the sedimentation period of Shasi section the climate has been dry, and slightly more humid during the sedimentation period of the Shasan section, mainly semihumid to humid. The Sr/Ba index indicates that the Shasi section sediments has been deposited in a brackish water environment, while the Shasan section sediments has been deposited in a fresh-brackish water environment. Based on the sediment distribution pattern and the sedimentary structural characteristics in the study area, it could be calculated that the average maximum paleowater depths of the Shasan and Shasi section would be 60.07 m and 20.32 m, respectively. Based on the characteristics of the core samples of the Shasan-Shasi section in Chexi Depression, combined with the sedimentary environment and topography study in the area, it can be deduced that the Shasan section has developed slump deposits, sediment flow deposits, turbidity currents deposits, while the Shasi section has developed mudstone flow deposits.
- Bohai Bay Basin /
- Chexi Depression /
- Shasan-Shasi section /
- gravity flow deposition /
- palaeoenvironmental evolution

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