1. Department of Geology and Paleontology, University of Szeged, 2-6 Egyetem Street, H-6722 Szeged, Hungary
2. Department of Mineralogy, Geochemistry and Petrology, University of Szeged, 2-6 Egyetem Street, H-6722 Szeged, Hungary
3. INTERACT AMS Laboratory Nuclear Research Center, 18/C Bem Square, H-4026 Debrecen, Hungary