Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada; 2. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. Department of Earth Sciences, University of Western Ontario, London, Ontario, N6A 5B7, Canada; 4. College of Resources and Environment, Hefei University of Technology, Hefei 230009, Anhui, China; 5. Department of Geology, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada