Grain size features of the modern tidal−flat sediment on the north bank of Hangzhou Bay and the implication of sea-level reconstruction

ZHAN Qing; ZHAO Baocheng; CHEN Kunyu; SHI Yujin; WANG Hanmei

doi:10.12097/gbc.2022.03.042

2024 Vol. 43, No. 4

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Article navigation > Geological Bulletin of China > 2024 > 43(4): 516-526

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ZHAN Qing, ZHAO Baocheng, CHEN Kunyu, SHI Yujin, WANG Hanmei. 2024. Grain size features of the modern tidal−flat sediment on the north bank of Hangzhou Bay and the implication of sea-level reconstruction. Geological Bulletin of China, 43(4): 516-526. doi: 10.12097/gbc.2022.03.042

Citation:

ZHAN Qing, ZHAO Baocheng, CHEN Kunyu, SHI Yujin, WANG Hanmei. 2024. Grain size features of the modern tidal−flat sediment on the north bank of Hangzhou Bay and the implication of sea-level reconstruction. Geological Bulletin of China, 43(4): 516-526. doi: 10.12097/gbc.2022.03.042

Grain size features of the modern tidal−flat sediment on the north bank of Hangzhou Bay and the implication of sea-level reconstruction

1.
Shanghai Institute of Geological Survey, Shanghai 200072, China
2.
Key Laboratory of Land Subsidence Monitoring and Prevention, Ministry of Natural Resources, Shanghai 200072, China
3.
Shanghai Engineering Research Center of Land Subsidence, Shanghai 200072, China
4.
Shanghai High School International Division, Shanghai 200231, China

Received Date: 23 March 2022

Revised Date: 23 June 2022

Publish Date: 15 April 2024

Abstract

Abstract

In this paper we take detail analyses on the sediment grain size for three tidal flat sections to set up the diagnostic indexes for recognization of tidal flat facies along the north bank of the Hangzhou Bay. The study also examined the application of the diagnostic indexes for distinguishing salt marsh, upper and lower tidal flats in a Holocene sediment core HZK11. The results show that clay and sand components could be the diagnostic indexes for distinguishing salt marsh, upper and lower tidal flats. Salt marsh volume curves are different from the upper and lower tidal plat. The parameters (Mode, Median and Mode) are effective indexes to identify salt marsh upper and lower tidal flat sediments.Above diagnostic sediment components, grain size parameters and volume curves are applied successfully to identify the exact tidal plat facies in boreholes and can be used to reconstruct relative sea-level which demonstrates sea-level rise of around 1.2 cm/a from 9700 cal a BP to 8700 cal a BP.
- grain size analysis /
- diagnostic indexes /
- tidal flat facies /
- sea-level /
- Hangzhou Bay

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References

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