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Volume 41 Issue 1
Jan.  2022
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Article Navigation >  Bulletin of Geological Science and Technology  > 2022  >  41(1): 90-98
Li Jing, Zhang Yanian, Liang Xing, Liu Yan. Paleo-salt porewater trapped in the clayey aquitard and its transport processes in Jiangsu coastal plain[J]. Bulletin of Geological Science and Technology, 2022, 41(1): 90-98. doi: 10.19509/j.cnki.dzkq.2021.0158
Citation: Li Jing, Zhang Yanian, Liang Xing, Liu Yan. Paleo-salt porewater trapped in the clayey aquitard and its transport processes in Jiangsu coastal plain[J]. Bulletin of Geological Science and Technology, 2022, 41(1): 90-98. doi: 10.19509/j.cnki.dzkq.2021.0158
shu

Paleo-salt porewater trapped in the clayey aquitard and its transport processes in Jiangsu coastal plain

doi: 10.19509/j.cnki.dzkq.2021.0158
  • Received Date: 08 Jul 2021
    Available Online: 02 Mar 2022
    Abstract
  • Clayey aquitards are widespread in the coastal plain and they are capable to preserve paleo-saltwater. Its salinity distribution and transport process play an important role on the evolution of aquifer groundwater, yet they have attracted little attention. In this paper, undisturbed clayey samples in seven boreholes along the Jiangsu coastal plain were collected and porewater was extracted by squeezing. Based on the natural tracers Cl- and Br- profiles and numerical simulation, porewater salinity characterization and transport mechanism were analyzed. The results showed that two trends of porewater Cl- variations are observed: one is that Cl- peak value is near surface and decreases with depth; the other one is that the Cl- peak value is at depth of 25 m and decreases towards both ends. Porewater has a Cl- range of 486.2-38 036.7 mg/L and Cl/Br of 72-360(average: 241). The relations between Cl- and Cl/Br ratios and the profile signature indicate that saline porewater is of marine origin, and from the Holocene transgression seawater. Subsequently, they were diluted by freshwater. Aquitard porewater 1-D transport model suggests that the transgression and regression events are dominant for the salinity evolution. Holocene seawater is still trapped in the sediment whereas Pleistocene seawater has been flushed out. In aquitard, diffusion is dominant for solute transport with the vertical velocity of 0.43-15.8 mm/yr and influenced by advection in higher permeability sand layers. The redistribution of paleo-saltwater, in particular, in the condition of groundwater over-extraction, would be the important saline source for aquifer groundwater.

     

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