Alexander V Sobolev, ISTerre Institute of Earth Sciences, Saint Martin d'Hères, France, Evgeny Asafov, Vernadsky Institute of Geochemistry and Analytical Chemistry RAS, Moscow, Russia, Andrey Gurenko, Centre de Recherches Pétrographiques et Géochimiques (CRPG), Vandoeuvre-lès-Nancy, France, Nicholas T Arndt, Université Grenoble Alpes, ISTerre, Grenoble, France, Valentina G. Batanova, ISTerre, Unversite J Fourier, Grenoble, France; University Grenoble Alpes, Grenoble, France, Maxim Portnyagin, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, Dieter Garbe-Schönberg, Institute of Geosciences, Geology, Kiel, Germany, Allan Wilson, University of the Witwatersrand, Johannesburg, South Africa and Gary R Byerly, Louisana State Univ, Baton Rouge, LA, United States