1. ISTO, UMR 7327, CNRS/INSU, FR-45071 Orléans, France
2. ISTO, UMR 7327, Université d'Orléans, FR-45071 Orléans, France
3. ISTO, UMR 7327, BRGM, FR-45071 Orléans, France
4. Institute for Advanced Studies, Le Studium, Orléans, France
5. Department of Geography, University of Cambridge, Downing Place, Cambridge CB2 3EN, UK
6. Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, New Mexico 87801, USA
7. Department of Earth Sciences, University of Camerino, IT-62302 Camerino, Italy