1. Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography; University of California; San Diego, La Jolla California 92093 USA
2. University of California, San Diego; San Diego Supercomputer Center; 9500 Gilman Drive, Mail Code 0527, La Jolla California 92093 USA
3. Division of Chemical Sciences, Geosciences, and Biosciences, SC-14, Office of Basic Energy Sciences; U.S. Department of Energy; 19901 Germantown Road, Germantown Maryland 20874 USA
4. Department of Geology; University of Maryland; College Park Maryland 20742 USA
5. Max-Planck-Institut für Chemie; Postfach 3060 55020 Mainz Germany
6. Earth and Planetary Sciences; Harvard University; Cambridge Massachusetts 02138 USA
7. Lamont-Doherty Earth Observatory; Palisades New York 10964 USA
8. Department of Earth and Atmospheric Sciences; Cornell University; Ithaca New York 14853 USA
9. National High Magnetic Field Laboratory and Department of Geological Sciences; Florida State University; 1800 E Paul Dirac Drive, Tallahassee Florida 32306 USA