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- W2185858598 abstract "Granitic pegmatites from the Grenville hovince predominantly carry a NYF+ype geochemical signature. Their accessory minerals includes a variety of (Nb,Lr,U)-oxide minerals, of which columbite-group minerals are infrequent members (nine occurrences to date). As compared to better-studied granitic pegmatites of LCT-rype suites, the chemistry of these columbite-group minerals is anomalous: (1) there is a general shift toward (Fe,M)-rich compositions, (2) Ti is normally present in subordinate amounts, (3) levels of Zr, Mg, Sc, and W are significant, (4) U contents are several orders of magnitude higher than reported elsewhere, and (5) many lanthanons occur in concentrations detectable by electron microprobe. The structural state of the samples is variable, ranging from dominantly cation-disordered to dominantly ordered. For the Quadeville Beryl pegmatite, the structural state of columbite-group minerals shows a systematic variation with pegmatite zonation. Although the individual bodies of pegmatite have achieved low to moderate degrees of fractionation, the geochemical expressions of fractionation are detectable and can be used to evaluate the internal evolution of each body. Trace-element bghavior is occasionally the reverse of expectations, and is not consistent from pegmatite to pegmatite; as a suite, NYF pegmatites have to be much better characterized before such discrepancies can be properly evaluated." @default.
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- W2185858598 date "1994-06-01" @default.
- W2185858598 modified "2023-09-23" @default.
- W2185858598 title "The geochemistry and crystal chemistry of columbite-group minerals from granitic pegmatites, southwestern Grenville Province, Canadian Shield" @default.
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