Uranium-bearing francolites present in organic-rich limestones of NW Greece: a preliminary study using synchrotron radiation and fission track techniques

Made available in DSpace on 2018-11-26T17:15:42Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-01-01DAADBMBFSynchrotron radiation techniques (mu-XRF and mu-XANES) were applied to the study of organic-rich phosphatized limestones of NW Greece (Epirus). The results revealed uranium accumulation in areas of the material containing, among others, carbonate apatite (francolite) and organic matter. The UL (3)-edge of mu-XANES spectra showed that uranium was present in tetravalent form. U-bearing francolite crystals were separated from the rock and characterized by Raman spectroscopy and microprobe. The analysis of the crystals also indicated the presence of sodium and sulfur. The uranium presence in the crystals was also visualized, after neutron irradiation and etching, by the observation of the fission tracks.Aristotle Univ Thessaloniki, Dept Chem, Thessaloniki 54124, GreeceHeidelberg Univ, Inst Earth Sci, Res Grp Thermochronol & Archaeometry, Postfach 103980, D-69029 Heidelberg, GermanyUniv Athens, Dept Geol & Geoenvironm, Panepistimiopolis 15784, Zografou, GreeceKarlsruhe Inst Technol, ANKA Synchrotron Radiat Facil, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, GermanyTech Univ Denmark, Ctr Electron Nanoscopy, DK-2800 Lyngby, DenmarkUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, Dept Petrol & Metalogenia, Av 24-A,1515, BR-13506900 Rio Claro, SP, BrazilUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, Dept Petrol & Metalogenia, Av 24-A,1515, BR-13506900 Rio Claro, SP, BrazilDAAD: UNIBRAL: 56265621BMBF: 05K13VH