Affiliation: | XIAO Tangfu~(1,3), Boyle Dan~2, Guha Jayanta~3, HONG Yetang~1 and ZHENG Baoshan~1 1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 2. Mineral Resources Division, Geological Survey of Canada, Ottawa K1A 0 ES, Canada; 3. Science de la Terre, Departement des Sciences Aplliquees, Universite du Quebec a Chicoutimi, Quebec G7 H 2B1, Canada |