1. The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences, Curtin University, Perth, WA 6845, Australia
2. Physics of Geological Processes (PGP), The Njord Centre, Department of Geosciences, University of Oslo, 0316 Oslo, Norway
3. Institut für Mineralogie, University of Münster, Münster 48149, Germany