1. Camborne School of Mines University of Exeter Penryn UK
2. Department of Geology and Geophysics Woods Hole Oceanographic Institution Woods Hole MA USA
3. Aix Marseille University, CNRS, IRD, INRAE, Collège de France, CEREGE Aix en Provence France
4. School of Environment, Earth and Ecosystem Sciences Faculty of Science, Technology and Mathematics, The Open University Milton Keynes UK
5. National Environmental Isotope Facility, British Geological Survey, UK and School of Biosciences, University of Nottingham Nottingham UK
6. Now at Department of Earth Sciences University of Bergen Bergen Norway
7. Environment and Sustainability Institute, University of Exeter Penryn UK