1. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, P.R. China
2. Department of Chemistry & Biochemistry, California State University East Bay, Hayward, California 94542, United States
3. Energy Geosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. BRGM, Orléans 45060, France
5. Univ. Orléans, CNRS, BRGM, ISTO, UMR 7327, F-45071, Orléans, France