1. School of Earth, Atmospheric and Environmental Sciences; The University of Manchester; Manchester M13 9PL UK
2. Department of Geovitenskap; University of Bergen; Realfagbygget, Allegaten 41 5007 Norway
3. NERC Isotope Community Support Facility; Scottish Universities Environmental Research Centre; Rankine Avenue, Scottish Enterprise Technology Park East Kilbride G75 0QF UK
4. Department of Earth Science and Engineering; Imperial College London; Prince Consort Road London SW7 2AZ UK
5. School of Earth Sciences; The University of Bristol; Wills Memorial Building, Queens Road Bristol BS8 1RJ UK