1Institute of Geology and Palaeontology, Charles University, Albertov 6, 128 43 Prague 2, Czech Republic
2HYDROTECH SG, s.r.o., Přemyslova 6, 128 00 Praha 2, Czech Republic
3Energy and Geoscience Institute, University of Utah, Salt Lake City, USA
4Czech Geological Survey, Klárov 3, P.O.Box 85, 118 21 Prague 1, Czech Republic
5Department of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Prague 2, Czech Republic
6Department of Earth Sciences, The University of Western Ontario, London, Ontario N6A 5B7, Canada