1. Department of Earth and Planetary Sciences University of Tennessee Knoxville TN USA
2. Department of Geological Sciences University of Texas at Austin Austin TX USA
3. Department of Earth, Environmental and Planetary Sciences Brown University Providence RI USA
4. Leibniz Universität Hannover Institut für Mineralogie Hannover Germany
5. Western Colorado University Gunnison CO USA
6. Lamont Doherty Earth Observatory Columbia University New York NY USA