1. Geological Survey of Canada, 601 Booth Street, Ottawa, ON, Canada K1A 0E8
2. Queen's Facility for Isotope Research, Department of Geological Sciences and Geological Engineering, Queen's University, 36 Union Street, Kingston, Ontario, Canada K7L 3N6
3. Arthur B. McDonald Canadian Astroparticle Physics Research Institute, Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario, Canada K7L 3N6