Daniel Robert Lester, RMIT University, Melbourne, VIC, Australia, Marco Dentz, IDAEA-CSIC, Barcelona, Spain, Aditya Bandopadhyay, Géosciences Rennes, Rennes Cedex, France and Tanguy Le Borgne, University of Rennes, Geosciences Rennes, CNRS, UMR 6118, Rennes Cedex, France