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- 1School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen’s Road, BS8 1RJ, Bristol, U.K.
- 2Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, 10th Street & Constitution Avenue NW, Washington, D.C. 20560-0119, U.S.A.
- 3Edinburgh Ion Microprobe Facility, School of Geosciences, University of Edinburgh, Grant Institute, Kings Buildings, West Mains Road, EH9 3JW, Edinburgh, U.K.
Manuscript handled by Maurizio Petrelli