Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1039/c4em00019f |
Geochemical evolution of groundwater salinity at basin scale: a case study from Datong basin, northern China | |
Wu, Ya; Wang, Yanxin1 | |
通讯作者 | Wang, Yanxin |
来源期刊 | ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS |
ISSN | 2050-7887 |
EISSN | 2050-7895 |
出版年 | 2014 |
卷号 | 16期号:6页码:1469-1479 |
英文摘要 | A hydrogeochemical investigation using integrated methods of stable isotopes (O-18, H-2), Sr-87/Sr-86 ratios, Cl/Br ratios, chloride-mass balance, mass balance and hydrogeochemical modeling was conducted to interpret the geochemical evolution of groundwater salinity in Datong basin, northern China. The delta H-2, delta O-18 ratios in precipitation exhibited a local meteoric water line of delta H-2 = 6.4 delta O-18 -5 (R-2 = 0.94), while those in groundwater suggested their meteoric origin in a historically colder climatic regime with a speculated recharge rate of less than 20.5 mm overall per year, in addition to recharge from a component of deep residual ancient lake water enriched with Br. According to the Sr isotope binary mixing model, the mixing of recharges from the Shentou karst springs (24%), the western margins (11%) and the eastern margins (65%) accounts for the groundwater from the deep aquifers of the down-gradient parts in the central basin is a possible mixing mechanism. In Datong, hydrolysis of silicate minerals is the most important hydrogeochemical process responsible for groundwater chemistry, in addition to dissolution of carbonate and evaporites. In the recharge areas, silicate chemical weathering is typically at the bisiallitization stage, while that in the central basin is mostly at the monosiallitization stage with limited evidence of being in equilibrium with gibbsite. Na exchange with bound Ca, Mg prevails at basin scale, and intensifies with groundwater salinity, while Ca, Mg exchange with bound Na locally occurs in the east pluvial and alluvial plains. Although groundwater salinity increases with the progress of water-rock/sediment interactions along the flow path, as a result of carbonate solubility control and continuous evapotranspiration, Na-HCO3 and Na-Cl-SO4 types of water are usually characterized respectively in the deep and the shallow aquifers of an inland basin with a silicate terrain in an arid climatic regime. |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000336841600026 |
WOS关键词 | MASS-BALANCE METHOD ; ENVIRONMENTAL ISOTOPES ; NORTHWEST CHINA ; CL/BR RATIOS ; WATER ; RECHARGE ; CHLORIDE ; FLOW ; RESOURCES ; BROMIDE |
WOS类目 | Chemistry, Analytical ; Environmental Sciences |
WOS研究方向 | Chemistry ; Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/181975 |
作者单位 | 1.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China; 2.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China |
推荐引用方式 GB/T 7714 | Wu, Ya,Wang, Yanxin. Geochemical evolution of groundwater salinity at basin scale: a case study from Datong basin, northern China[J],2014,16(6):1469-1479. |
APA | Wu, Ya,&Wang, Yanxin.(2014).Geochemical evolution of groundwater salinity at basin scale: a case study from Datong basin, northern China.ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS,16(6),1469-1479. |
MLA | Wu, Ya,et al."Geochemical evolution of groundwater salinity at basin scale: a case study from Datong basin, northern China".ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS 16.6(2014):1469-1479. |
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