1. School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, United Kingdom
2. Natural Environment Research Council (NERC) Isotope Facility, Scottish Universities Environmental Research Centre, Rankine Avenue, Scottish Enterprise Technology Park, East Kilbride G75 0QF, Scotland
3. Teck Resources Limited, Bentall 5, 550 Burrard Street, Suite 3300, Vancouver, British Columbia V6C 0B3, Canada