1. Earth and Oceanographic Science, Bowdoin College, Brunswick, ME 04011, USA.
2. Geoscience Atom Probe Facility, Advanced Resource Characterisation Facility, John de Laeter Centre, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
3. Department of Applied Geology, Western Australian School of Mines, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
4. Department of Physics and Astronomy, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
5. Department of Geosciences, University of Massachusetts, Amherst, MA 01003, USA.
6. Department of Earth Science, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.