Journal
APPLIED GEOCHEMISTRY
Volume 23, Issue 12, Pages 3519-3534Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.apgeochem.2008.07.019
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Funding
- National Science Foundation of China [40671029]
- Dudley Stamp grants programme of the Royal Society
- Hong Kong Grants Programme of the Royal Geographical Society
- British Society for Geomorphology
- ERC [1141.1005, 1206.1006]
- NERC ICP-AES [GSS/301/0905, OSS/313/0506]
- 111 Project [B06026]
- Royal Society [PEK/0992/306]
- NERC [bgs05007] Funding Source: UKRI
- Natural Environment Research Council [bgs05007] Funding Source: researchfish
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Sources of groundwater recharge to the Badain Jaran Desert in China have been investigated using geochemical and isotopic techniques. Stable isotope compositions (6180 and delta(2)H) of shallow groundwater and surface water from oasis lakes evolve from a starting composition considerably depleted compared to local unsaturated zone moisture, confirming inferences from chloride mass balance that direct infiltration of precipitation is not a volumetrically important source of recharge to the shallow aquifer in the study area. Shallow phreatic and deeper confined groundwater bodies appear unconnected based on chemical composition and radiocarbon activities. Hydrogeologic evidence points toward a bordering mountain range (Yabulai) as a likely recharge zone, which is consistent with tracer results. A mean residence time in the range of 1-2 ka for the desert's southeastern margin is inferred from radiocarbon. These results reveal that some replenishment to the desert aquifer is occurring but at a rate much lower than previously suggested, which is relevant for water resources planning in this ecologically sensitive area. (C) 2008 Elsevier Ltd. All rights reserved.
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