海州湾弱透水层孔隙水的化学特征与盐分演变

李静; 朱佳俊; 梁杏; 刘彦; 江欣悦; 杜永昌

doi:10.3799/dqkx.2022.232

Volume 49 Issue 3

Mar. 2024

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Article Navigation > Earth Science > 2024 > 49(3): 939-951

Li Jing, Zhu Jiajun, Liang Xing, Liu Yan, Jiang Xinyue, Du Yongchang, 2024. Chemical Signatures and Salinity Evolution of Aquitard Porewater in the Haizhou Bay. Earth Science, 49(3): 939-951. doi: 10.3799/dqkx.2022.232

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Li Jing, Zhu Jiajun, Liang Xing, Liu Yan, Jiang Xinyue, Du Yongchang, 2024. Chemical Signatures and Salinity Evolution of Aquitard Porewater in the Haizhou Bay. Earth Science, 49(3): 939-951. doi: 10.3799/dqkx.2022.232

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Chemical Signatures and Salinity Evolution of Aquitard Porewater in the Haizhou Bay

doi: 10.3799/dqkx.2022.232

1.
School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
2.
Geological Survey Institute of Jiangsu Province, Nanjing 210018, China
3.
Key Laboratory of Earth Fissures Geological Disaster, Ministry of Natural Resources, Nanjing 210018, China

Received Date: 2022-03-21
Available Online: 2024-04-12
Publish Date: 2024-03-25

Abstract

Abstract

To ascertain the salinity origin and evolution of aquitard porewater in the coastal zone, this paper collected four borehole core samples in the Laizhou Bay, Lianyungang City, and porewater was then extracted by mechanical squeezing. The chemical and isotopic components of porewater were measured and a solute transport model of porewater since Holocene in a 2D typical section was established. The results show that the total dissolved solids of porewater range from 0.9 to 41.4 g/L from land to sea, and it is higher in shallower sediments and lower in deeper ones. Porewater has Cl/Br ratio of 170-533 (267 in average) and ⁸⁷Sr/⁸⁶Sr of 0.709 3-0.711 6, together with the positive correlation between Cl^‒ and δ¹⁸O, indicating that saline porewater is of marine origin and has been affected by silicate weathering and cation exchange. In the Holocene aquitard, porewater is trapped ancient seawater in 10-5 ka BP and the downward infiltration led to salinization of the underlying Pleistocene porewater. About 4 ka BP, porewater was diluted by freshwater in the regression, yet paleo-seawater has not been totally flushed. While in the area close to the coastline, the continuous evaporation led to the occurrence of much saltier porewater. Porewater simulation suggests that aquitard porewater salinity evolution is mainly controlled by transgression-regression events, and during transgression, seawater downward invaded in a "finger-like" pattern, resulting in the heterogeneous distribution of brackish and fresh groundwater.
- aquitard,
- porewater,
- salinity evolution,
- transport,
- Lianyungang City,
- hydrochemistry,
- environmental geology

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References(47)

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Chemical Signatures and Salinity Evolution of Aquitard Porewater in the Haizhou Bay

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