1. Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
2. Univ. Lille, CNRS, INRA, ENSCL, UMR 8207, UMET—Unité Matériaux et Transformations, F-59000 Lille, France
3. Bavarian Research Institute of Experimental Geochemistry and Geophysics, University Bayreuth, 95440 Bayreuth, Germany
4. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA