1. Earth Sciences Department; Vrije University Amsterdam; Amsterdam Netherlands
2. Laboratoire de Géologie de Lyon: Terre, Planètes, Environnement; University of Lyon; Villeurbanne Cedex France
3. Institut de Recherche en Astrophysique et Planétologie; Université Paul Sabatier; Toulouse France
4. Institute of Planetary Research; German Aerospace Center; Berlin Germany
5. Department of Earth Sciences; Brock University; St. Catharines Ontario Canada
6. Pangaea Scientific; Brockville Ontario Canada