1 State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China.
2 State Key Laboratory of Isotope Geochemistry and Chinese Academy of Sciences Center for Excellence in Deep Earth Science, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
3 University of Chinese Academy of Sciences, Beijing 100049, China.