Million-year-old groundwater revealed by krypton-81 dating in Guanzhong Basin, China

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1. National Natural Science Foundation of China [41602276, 21225314]
2. China Postdoctoral Science Foundation Funded Project [2015M581168]
3. National Key R&D Program of China [2016YFA0302200]
4. Special Fund for Land and Resources Research in the Public Interest [201511046]
5. Sinopec Green Energy Geothermal Development Co., Ltd