1. Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180,
USA
2. Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
3. Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180,
USA
4. Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA