1. Department of Earth Sciences ETH Zurich Zurich Switzerland
2. Now at Institut für Geologie, Leibniz Universität Hannover, Hannover, Germany.
3. Géosciences Azur Université de Nice Sophia Antipolis, CNRS, IRD Nice France
4. Department of Earth Sciences Royal Holloway, University of London Egham UK
5. IMG Quartier UNIL‐Dorigny Lausanne Switzerland