1. Max Planck Institute (MPI) for Chemistry, Post Office Box 3060, 55020 Mainz, Germany.
2. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygin Street 19, 119991 Moscow, Russia.
3. Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Koptuyga prospekt 3, 630090 Novosibirsk, Russia.
4. Research School of Earth Sciences, Australian National University, Canberra, ACT 0200 Australia.
5. Laboratoire de Géodynamique des Chaînes Alpines, Université de Grenoble, 38401 Grenoble cedex, France.