1. Université d'Orléans; ISTO, UMR; Orléans France
2. CNRS/INSU; ISTO,UMR; Orléans France
3. BRGM; ISTO; Orléans France
4. Sorbonne Universités; ISTeP UPMC; Paris France
5. CNRS UMR 7193; Université Pierre et Marie Curie; Paris CEDEX France
6. Department of Earth Sciences, Utrecht University; Utrecht Netherlands
7. Now at TNO Geological Survey of the Netherlands; Utrecht Netherlands