Pattern of minor element enrichment in columbites: A synchrotron radiation X-ray fluorescence (SRXRF) study |
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| Institution: | 1. CSIR—National Geophysical Research Institute, Council of Scientific and Industrial Research, Uppal Road, Hyderabad 500 007, India;2. Jack Satterly Geochronology Laboratory, Department of Geology, Earth Sciences Centre, University of Toronto, 22 Russell Street, Toronto, Ontario M5S 3B1, Canada;1. Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia;2. Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia |
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| 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. |
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