1. GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
2. Department of Earth Sciences, Freie Universität Berlin, 12249 Berlin, Germany
3. The Rossendorf Beamline at ESRF, The European Synchrotron, CS 40220, 38043 Grenoble Cedex 9, France
4. Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraβe 400, 01328 Dresden, Germany