Wei Yuan (a)State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China. b)University of Chinese Academy of Sciences, Beijing 100049, China), Jiubin Chen (State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.), Zuoying Yin (State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.), Jean Louis Birck (Laboratoire de Géochimie et Cosmochimie, Institute de Physique du Globe de Paris (IPGP), 75252 Paris, France)