1. 1Department of Earth & Planetary Sciences, McGill University, 3450 Rue University, Montréal, Québec H3A 0E8, Canada
2. 2Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
3. 3Department of Earth and Environmental Sciences, St. Francis Xavier University, Antigonish, Nova Scotia B2G 2W5, Canada
4. 4Earth Dynamics Research Group, The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences, Curtin University, Perth, Western Australia 6845, Australia
5. 5Department of Earth & Atmospheric Sciences, University of Alberta, Edmonton, Alberta 26G 2E3, Canada
6. 6Institute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk 664033, Russia