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Title: Pattern of minor element enrichment in columbites: A synchrotron radiation X-ray fluorescence (SRXRF) study
Authors: Mirao, J.P.
Figueiredo, M.O.
Keywords: Columbite
Solid solutions
Trace elements
Synchrotron microprobe
Issue Date: 2006
Publisher: Elsevier
Citation: J.P. Mirão and M.O. Figueiredo (2006) Pattern of minor element enrichment in columbites: A synchrotron radiation X-ray fluorescence (SRXRF) study. Chemical Geology, Vol. 225 (3-4), pp. 402-410.
Abstract: The pattern of minor elements incorporation in columbites from granitic pegmatites of Alto Ligonha, Mozambique, was disclosed on the basis of synchrotron radiation X-ray fluorescence (SRXRF) data. Major elements (Fe, Mn, Nb, Ta) were analyzed with an electron microprobe (EPMA). Minor and trace element contents display a common general trend pointing towards the preferential uptake of metals that minimize the stress induced in the host crystal structure by the non-commensurability of cations with distinct valences and ionic radii. The simultaneous incorporation of Ti, Zr, U, Pb, Y and W assures electrostatic equilibrium, being conditioned by the dominant presence of niobium, while Sc concentrates in solid solutions with low Nb/(Nb+Ta) ratios.
Type: article
Appears in Collections:CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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