1. Camborne School of Mines and Environment and Sustainability Institute University of Exeter, Penryn Campus Cornwall UK
2. MARUM – Center for Marine Environmental Sciences University of Bremen Bremen Germany
3. School of GeoSciences University of Edinburgh Edinburgh UK
4. NERC Isotope Geosciences Facility, British Geological Survey, Nottingham, NG12 5GG, UK and Centre for Environmental Geochemistry, School of Biosciences, Sutton Bonington Campus University of Nottingham Loughborough UK
5. Department of Earth and Planetary Sciences University of California Santa Cruz Santa Cruz CA USA