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|Title: ||Pattern of minor element enrichment in columbites: A synchrotron radiation X-ray fluorescence (SRXRF) study|
|Authors: ||Mirao, J.P.|
|Issue Date: ||2006|
|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.|
|Appears in Collections:||CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
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