1. Laboratoire Magmas et Volcans, CNRS-UMR6524, IRD-UMR163, OPGC, Université Clermont Auvergne, F-63178 Aubière, France
2. Universidade de Coimbra, Centro de Geociências, Departamento de Ciências da Terra, Coimbra, Portugal
3. Institute of Geosciences, University of Potsdam, 14476 Potsdam, Germany
4. UFMG-Federal University of Minas Gerais, Belo Horizonte, Brazil
5. Institute of Geological Sciences, University of Bern, 3012 Bern, Switzerland
6. Geological Survey of Finland, P.O. Box 96, FI-02151 Espoo, Finland