1. Institute of Geological Sciences, University of Wrocław, 50-204 Wrocław, Poland
2. Département de Géologie, UMR 6524 CNRS, Université Blaise Pascal, Clermont-Ferrand, France
3. Department of Geology, School of Natural Sciences, Trinity College, Dublin, Ireland
4. Centre of Isotopic Research, A.P. Karpinsky All-Russian Geological Research Institute (VSEGEI), St Petersburg, Russia