1. Australian Research Council Centre of Excellence for Core to Crust Fluid Systems/GEMOC, Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia
2. Centre for Earth Evolution and Dynamics, Department of Geosciences, University of Oslo, 0371 Oslo, Norway
3. Laboratori de Càlcul Numèric, Escola Tècnica Superior d’Enginyers de Camins, Canals i Ports, Universitat Politècnica de Catalunya, E-08034 Barcelona, Spain. E-mail: juan.afonso@mq.edu.au