[1] Stanford Synchrotron Radiat Lab, SLAC, Menlo Pk, CA 94025 USA
[2] Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA
[3] Univ Calif San Diego, Scripps Inst Oceanog, Div Marine Biol Res, San Diego, CA 92093 USA
[4] Univ Chicago, Consortium Adv Radiat Sources, Chicago, IL 60637 USA
[5] Univ Marne La Vallee, CNRS, Lab Geomat, FRE G2I 2455, F-774542 Marne La Vallee 2, France
[6] Dartmouth Coll, Dept Earth Sci, Hanover, NH 03755 USA
[7] Stanford Univ, Dept Civil & Environm Engn, Stanford, CA 94305 USA
[8] Univ Paris 06, IPGP, Lab Mineral Cristallog, F-75252 Paris 05, France
[9] Univ Paris 07, IPGP, Lab Mineral Cristallog, F-75252 Paris 05, France
[10] CNRS, UMR 7590, F-75252 Paris 05, France