1. Department of Earth Sciences, University of Geneva, CH-1205 Geneva, Switzerland
2. Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany
3. Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland
4. Department of Quantum Matter Physics (DQMP) and Group of Applied Physics (GAP), University of Geneva, CH-1211 Geneva, Switzerland