1. Chair of Geochemistry and Economic Geology, Institute for Applied Geosciences Karlsruhe Institute of Technology, , Adenauerring 20b, 76131 Karlsruhe, Germany
2. Laboratory for Environmental and Raw Materials Analysis (LERA) , Adenauerring 20b, 76131 Karlsruhe, Germany
3. Eberhard Karls University , Institute of Geosciences, Schnarrenbergstrasse 94-96, 72076 Tübingen, Germany
4. Mapping and Mineral Resources Geological Survey of Denmark and Greenland, , Øster Voldgade 10, DK-1350, Copenhagen K, Denmark