Paleo-geomorphology and sedimentary systems of the Xiyang tidal channel on the central Jiangsu coast at the late Pleistocene

Wang Hui; Xia Fei; Zhang Yongzhan; Gao Shu; Li Jiabiao

doi:10.3969/j.issn.0253-4193.2019.03.013

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Wang Hui, Xia Fei, Zhang Yongzhan, Gao Shu, Li Jiabiao. Paleo-geomorphology and sedimentary systems of the Xiyang tidal channel on the central Jiangsu coast at the late Pleistocene[J]. Haiyang Xuebao, 2019, 41(3): 134-142. doi: 10.3969/j.issn.0253-4193.2019.03.013

Citation:

Wang Hui, Xia Fei, Zhang Yongzhan, Gao Shu, Li Jiabiao. Paleo-geomorphology and sedimentary systems of the Xiyang tidal channel on the central Jiangsu coast at the late Pleistocene[J]. Haiyang Xuebao, 2019, 41(3): 134-142. doi: 10.3969/j.issn.0253-4193.2019.03.013

Citation:

Wang Hui, Xia Fei, Zhang Yongzhan, Gao Shu, Li Jiabiao. Paleo-geomorphology and sedimentary systems of the Xiyang tidal channel on the central Jiangsu coast at the late Pleistocene[J]. Haiyang Xuebao, 2019, 41(3): 134-142. doi: 10.3969/j.issn.0253-4193.2019.03.013

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Paleo-geomorphology and sedimentary systems of the Xiyang tidal channel on the central Jiangsu coast at the late Pleistocene

doi: 10.3969/j.issn.0253-4193.2019.03.013

1.
Key Laboratory of Coast & Island Development of Ministry of Education, Nanjing University, Nanjing 210023, China
2.
School of Urban and Resource Environment, Jiangsu Second Normal University, Nanjing 210013, China
3.
State Key Laboratory for Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
4.
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China

Received Date: 2017-06-28
Rev Recd Date: 2018-07-23

Abstract

Abstract

The South Yellow Sea has been one of the important sinks for the terrigenous sediments transported by the Changjiang and Yellow rivers. It contains abundant information for the river migration and evolution in the sedimentary records. The Xiyang tidal channel, as one of the important tidal channels in the northwestern radial sand ridge field, is located on the central Jiangsu coast of the South Yellow Sea. It has the strong impacts from both the ancient Yellow River and Changjiang River in this area. So far, the studies on the paleo-geomorphology and sedimentary strata are still not sufficient. Based on the about 380 km long shallow seismic profiles obtained in the study area, combined with the published data of sedimentary core, the shallow seismic sequence has been studied, and concerned characteristics of the sedimentary environments have been discussed. The results indicate that there is a regional unconformable seismic reflection interface underneath the seafloor, 33-49 m below the mean sea-level, characterized by strong amplitude, medium frequency and good continuity. This strong reflection interface could correspond to the top surface of coastal lacustrine deposits in the core. It is the representative for a paleo-geomorphological surface. The spatial distribution of this strong reflection interface, joint with the groove seismic structures underneath it, figure out that several ancient channels extending to the sea northeastwards and converging in the lower-lying area located in the north of the study area. The strong reflection interface is an eroded surface formed during the last deglaciation transgression. Its overlying is the shallow water deposits formed during the Holocene, on the other hand, its underlying is the deposits in flood plain or coastal marsh or ancient river or tidal channels formed during the last stage of the late Pleistocene. The further study of this regional interface is helpful to understand the evolution of the sedimentary systems in the western South Yellow Sea since the late Pleistocene, and to improve the understanding of the development of the radial sand ridge field.
- seismic stratigraphy,
- paleo-geomorphology,
- ancient channels,
- late Pleistocene,
- radial sand ridge field,
- South Yellow Sea

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References(28)

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