Samuel Angiboust, Institut de Physique du Globe de Paris, Paris, France, Johannes Glodny, GeoForschungsZentrum Potsdam, Potsdam, Germany, Aitor Cambeses, Institut für Geologie, Mineralogie and Geophysik Ruhr-Universität Bochum, Bochum, Germany, Tom Raimondo, University of South Australia, School of Natural and Built Environments, Adelaide, Australia, Patrick Monie, Géosciences Montpellier, Montpellier Cedex 05, France, Michael Popov, Ural State Mining University, Department of Petrography, Ekaterinburg, Russia and Michael G Bostock, University of British Columbia, Vancouver, BC, Canada