| Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences | Host |
| Groundwater Science and Engineering Limited | Publish |
| Citation: |
Tong Xiao-xia, Gan Rong, Gu Shu-qian, Sun Xing-le, Huang Kai-tuo, Yan Xiao-feng. 2022. Stable chlorine isotopic signatures and fractionation mechanism of groundwater in Anyang, China. Journal of Groundwater Science and Engineering, 10(4): 393-404. doi: 10.19637/j.cnki.2305-7068.2022.04.007
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Stable chlorine isotopic signatures and fractionation mechanism of groundwater in Anyang, China
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Abstract
The present work provides an online Bench II-IRMS technique for the measurement of stable chlorine isotope ratio, which is used to measure the δ37Cl of 38 groundwater samples from the Karst and Quaternary aquifers in Anyang area. The regional distribution and signature of δ37Cl value are characterized on the base of isotopic data. The results suggest that the δ37Cl value of Quaternary groundwater decreases with increasing Cl− concentration, and has no correlation with δ18O and δD values, but closely correlates with the depth to water table. The fractionation mechanism of the chlorine isotope is expounded according to the type of groundwater. The δ37Cl value of karst water is generally positive, which is relevant to the dissolution of evaporite (gypsum mine), and may be caused by the mixing of groundwater and precipitation. The groundwater of Quaternary unconfined aquifer is mainly recharged by precipitation, and the δ37Cl value of groundwater is generally negative. The δ37Cl value of groundwater in Quaternary confined aquifer is more negative with increasing the depth to water level and elevated Cl− concentration, which is possible to result from the isotope fractionation of ion filtration. The groundwater with inorganic pollutants in Quaternary unconfined aquifer has generally a positive δ37Cl value.
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Keywords:
- North China Plain /
- Groundwater /
- Gas Bench II-IRMS /
- Chlorine isotope /
- Karst aquifer
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References
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Tong Xiao-xia, Gan Rong, Gu Shu-qian, Sun Xing-le, Huang Kai-tuo, Yan Xiao-feng. 2022. Stable chlorine isotopic signatures and fractionation mechanism of groundwater in Anyang, China. Journal of Groundwater Science and Engineering, 10(4): 393-404. doi: 10.19637/j.cnki.2305-7068.2022.04.007
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Figure 1.
Geological map of the study area and distribution of sampling points
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Figure 2.
Correlation between groundwater Cl− concentration and δ37Cl values
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Figure 3.
Relationship between δ18O and δD values of groundwater
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Figure 4.
δ37Cl-δ18OH2O relationship
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Figure 5.
δ37Cl-δDH2O relationship
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Figure 6.
Relationship between groundwater Cl− ion concentration and burial depth
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Figure 7.
Relationship between groundwater δ37Cl value and burial depth
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Figure 8.
(a) Relationship between Cl− and δ37Cl values in pore pressurized water of the Quaternary system (b) Conceptual illustration of ion permeation. 034 (0.21, 105.5) indicates point 034 (δ37Cl, Cl−) , respectively