[1] Vanderbilt University, Department of Earth and Environmental Sciences, PMB 351805, 2301 Vanderbilt Place, Nashville,TN,37235-1805, United States
[2] Stanford University - US Geological Survey, SHRIMP Lab, Green Earth Sciences Building, 367 Panama Street, Stanford,CA,94305, United States
[3] University of California, Los Angeles, Department of Earth, Planetary, and Space Sciences, W.M. Keck Foundation Center for Isotope Geochemistry, 595 Charles Young Drive East, Box 951567, Los Angeles,CA,90095-1567, United States
[4] University of Oregon, Department of Geological Sciences, 1272 E. 13th Avenue, Eugene,OR,97403-1272, United States
[5] University of South Dakota, Department of Earth Sciences, Akeley-Lawrence Science Center, 414 E. Clark Street, Vermillion,SD,57069, United States