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Pb in naturally irradiated monazites and zircons

J Dubrail1, F Farges2, L Gautron1, M Harfouche3, C Borca3 and D Grolimund3

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Pb-LIII edge XANES and μ-XAFS experiments (bulk and μ-focalised) were performed to evaluate the speciation of radiogenic Pb in naturally irradiated monazites (ideally LaPO4) and zircons (ideally ZrSiO4) minerals after ca. one billion years. XANES spectra show that Pb is divalent in all the samples investigated. But large variation in the speciation of Pb has been evidenced from monazites to zircons. Ab-initio calculations (FEFF8.4) were preliminary tested in a set of Pb-sulfide, oxide, carbonate, phosphate and silicate minerals and converged using Dirac-Hara exchange potentials. In monazite, XANES spectra calculations results are consistent with Pb substituting to La.


PACS

78.70.Dm X-ray absorption spectra

Subjects

Condensed matter: electrical, magnetic and optical

Dates

Issue 1 (2009)



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