[1] Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112-0111, United States
[2] Department of Geological Sciences, University of North Carolina, Chapel Hill, NC 27599, United States
[3] Institute for Earth Sciences, University of Potsdam, Germany
[4] Geological Sciences and Institute for Crustal Studies, University of California, Santa Barbara, CA 93106-9630, United States