1 Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China.
2 Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China. Electronic address: sheng.xu@tju.edu.cn.
3 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Beijing 100044, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: haibin-wu@mail.iggcas.ac.cn.