1. Department of Geosciences; University of Tromsø; Tromsø Norway
2. Institut de la Sciences de la Terre d'Orléans; Université d'Orléans; Orléans France
3. Department of Geology; Basel University; Basel Switzerland
4. Now at Institut für Geowissenschaften; Frankfurt Germany
5. Institute for Mineralogy; Leibniz University of Hannover; Hannover Germany
6. Université de Lorraine, CNRS, CREGU, GeoRessources; Vandœuvre-lès-Nancy France
7. Research School of Earth Sciences; Australian National University; Canberra A.C.T. Australia