1. Université de Franche-Comté, Institut UTINAM, CNRS/INSU, UMR 6213, Besançon, France.
2. Université de Toulouse, UPS-OMP, CNRS-INSU, IRAP, Toulouse, France.
3. Department of Geology, University of South Florida, Tampa, Florida, USA.
4. Université Paris-Sud, Laboratoire IDES, UMR 8148, Orsay, France/CNRS, Orsay, France.