1. Department of Earth Sciences Uppsala University Villavägen 16 SE‐75236 Uppsala Sweden
2. CR2P UMR 7207 CNRS MNHN UPMC 57 rue Cuvier, CP 38 F‐75005 Paris France
3. IPANEMA USR 3461 CNRS MCC Site du Synchrotron SOLEIL BP48 Saint‐Aubin F‐91192 Gif‐sur‐Yvette France
4. Department of Geology Western Illinois University Tillman Hall 113 1 University Circle Macomb IL 61455 USA
5. MNHN/UPMC/CNRS/IRD – UMR 7208 BOREA 43 rue Cuvier 75005 Paris France