Affiliation: | a Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK;b Academy of Sciences (VISTA), c/o Geodynamics Centre, Geological Survey of Norway, Leiv Eirikssons vei, 39, Trondheim, N-7491, Norway;c Department of Geological Sciences, The University of Michigan, 2534 C.C. Little bldg., Ann Arbor, MI 48109-1063, USA |