Affiliation: | Center for Geodynamics, Geological Survey of Norway, Leiv Eirikssons vei 39, N-7491;Trondheim (Norway) Department of Geosciences, University of Houston, 312 S&R1;Houston Tx 77204-5007, GL and DTM, Carnegie Institution of Washington, 5241 Broad Branch Road, Washington DC 20015, USA, and School of Geosciences, University of the Witwatersrand, WITS, 2050, South Africa |