1. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
2. Department of Geology, San Jose State University, San Jose, California 95112, USA
3. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA
4. Department of Geology, University of Kansas, Lawrence, Kansas 66045, USA
5. Department of Earth Sciences, Memorial University of Newfoundland, St. John’s, Newfoundland A1B 3X5, Canada