1. State Key Laboratory of Loess and Quaternary Geology, Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi’an AMS Center, Institute of Earth Environment CAS, Xi’an 710061, China
2. Chengdu Center, China Geological Survey (Geosciences Innovation Center of Southwest China), Chengdu 611230, China
3. Xi’an Institute for Innovative Earth Environment Research, Xi’an 710061, China