1. Geological Survey of Norway; Leiv Eirikssons vei 39 7491 Trondheim Norway
2. Institute of Petrology and Structural Geology; Charles University; 128 43 Praha 2 Czech Republic
3. Department of Geology; University of Tromsø; Dramsveien 201 9037 Tromsø Norway
4. School of Geography, Earth and Environmental Sciences; Plymouth University; Fitzroy, Drake Circus Plymouth Devon PL4 8AA UK
5. Department of Geosciences; University of Oslo; Postbox 1047 Blindern 0316 Oslo Norway
6. Department of Geosciences; Swedish Museum of Natural History; Box 50007 SE-104 05 Stockholm Sweden