1. Laboratoire G-Time; Université Libre de Bruxelles; CP 160/02 50 Avenue F. D. Roosevelt Brussels B-1050 Belgium
2. Earth System Science; Vrije Universiteit Brussel; Pleinlaan 2 Brussels B-1050 Belgium
3. Department of Analytical Chemistry; Ghent University; Krijgslaan 281-S12 Ghent B-9000 Belgium
4. Department of Earth, Ocean & Atmospheric Science and National High Magnetic Field Laboratory; Florida State University; Tallahassee Florida 32310 USA
5. Museum für Naturkunde; Leibniz-Institut für Evolutions-und Biodiversitätsforschung; Invalidenstraße 43 Berlin 10115 Germany
6. Department of Applied Geology & JdL CMS; Western Australian Argon Isotope Facility; Curtin University of Technology; GPO Box U1987 Perth WA 6845 Australia
7. Department of Geoscience; University of Wisconsin-Madison; Madison Wisconsin 53706 USA