Jun Zhong, Tianjin University, Tianjin, China, Si-Liang Li, Institute of Surface-Earth System Science,Tianjin University, Tianjin, China, Daniel Enrique Ibarra, Stanford University, Stanford, CA, United States, Hu Ding, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China and Cong-Qiang Liu, Chinese Academy Sciences, Guiyang, Guizhou, China