Stable chlorine isotopic signatures and fractionation mechanism of groundwater in Anyang,China |
| |
| Authors: | Xiao-xia Tong Rong Gan Shu-qian Gu Xing-le Sun Kai-tuo Huang Xiao-feng Yan |
| |
| Affiliation: | 1.China geological Environmental Monitoring Institute, Beijing 100081, China2.School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China3.Henan ProvincialGeological Environment PlanningDesign Co., ltd, Zhengzhou 450001, China4.Henan Provincial Institute of Geological Environment Exploration, Zhengzhou 450001, China5.Henan Baoyuan Exploration Technology Co., Ltd, Zhengzhou 476341, China |
| |
| 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. |
| |
| Keywords: | North China Plain Groundwater Gas Bench II-IRMS Chlorine isotope Karst aquifer |
|
| 点击此处可从《》浏览原始摘要信息 |
|
点击此处可从《》下载全文 |
|
