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The occurrence of niobian zirconolite, pyrochlore and baddeleyite in the Kovdor carbonatite complex, Kola Peninsula, Russia

Published online by Cambridge University Press:  05 July 2018

C. Terry Williams
C. Terry Williams*
Affiliation:
Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
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Abstract

The compositions and textural relationships of the oxide minerals zirconolite, pyrochlore and baddeleyite are described. These occur as accessory minerals, often intergrown with each other, from a phoscorite rock associated with the Kovdor carbonatite complex. Both the zirconolite and baddeleyite have relatively high concentrations of Nb and Ta; the pyrochlore is rich in U and Ta. Backscattered electron images, coupled with detailed microprobe analyses, reveal complex compositional zoning in zirconolite and pyrochlore which reflect changes in the fluid composition during growth of these minerals. A comparison is made of incompatible element ratios Zr/Hf, Nb/Ta and Th/U between the three accessory minerals.

Keywords

zirconolitebaddeleyitepyrochlorecarbonatitesKola PeninsulaRussia
Type
Mineralogy
Information
Mineralogical Magazine , Volume 60 , Issue 401 , August 1996 , pp. 639 - 646
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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References

Bubnova, M.I., Kochurova, T.L., Rimskaya-Korsakov, O.M. and Filatov, S.K. (1973) Structural typo- morphic properties of baddeleyite of the Kovdor Massif. Leningrad Univ., Vestn., Geol Geogr., 18, 56–61.(in Russian).Google Scholar
Bulakh, A.G. and Ivanikov, V.V. (1984) The problems of mineralogy and petrology of carbonatites. Leningrad University Printing House, Leningrad, (in Russian), 230 pp.Google Scholar
Gerasimovsky, V.I. (1974) Trace elements in selected groups of alkaline rocks. In: The Alkaline Rocks(Sørensen, H., ed), John Wiley & Sons, London, 402—12.Google Scholar
Gieré, R. and Williams, C.T. (1992) REE-bearing minerals in a Ti-rich vein from the Adamello contact aureole (Italy). Contrib. Mineral. Petrols 112, 83–100.CrossRefGoogle Scholar
Heaman, L.M. and LeCheminant, A.N. (1993) Paragenesis and U-Pb systematics of baddeleyite. Chem. GeoL, 110, 95–126.CrossRefGoogle Scholar
Hogarth, D.D. (1989) Pyrochlore, apatite and amphi- bole: distinctive minerals in carbonatite. In: Carbonatites(Bell, K., ed), Unwin Hyman, London, 105-48.Google Scholar
Hogarth, D.D. and Horne, J.E.T. (1989) Non-metamict uranoan pyrochlore and uranpyrochlore from tuff near Ndale, Fort Portal area, Uganda. Mineral Mag., 53, 257–62.CrossRefGoogle Scholar
Kapustin, Yu.L. (1980) Mineralogy of carbonatites. Amerind Publishing Company Pvt. Ltd., New Dehli, 259 pp. (translated from Mineralogiya Karbonatitov. Nauka Publ. Moscow, 1971).Google Scholar
Kogarko, L.N., Kononova, V.A., Orlava, M.P. and Woolley, A.R. (1995) Alkaline rocks and carbonatites of the World Part 2: Former USSR. Chapman and Hall, London, 226 pp.Google Scholar
Kukharenko, A.A., Orlaova, M.P., Bulakh,. A.G., Bagdasarov, E.A., Rimskaya-Korsakova, O.M., Nephedov, E.I., Il'inskii, G.A., Ergeev, A.S. and Abakumova, N.B. (1965) The Caledonian complex of ultrabasic rocks and carbonatites of the Kola Peninsula and north Karelia.Nedra, Moscow, 772 pp (in Russian).Google Scholar
Knudsen, C. (1989) Pyrochlore group minerals from the Qaqarssuk carbonatite complex. In: Lanthanides, Tantalum and Niobium(Moller, P., Cerny, P. and Saupe, F., eds). Springer-Verlag Berlin, Heidelberg, 80—99.Google Scholar
Lebedova, S.I., Bytov, V.P., Dubakina, L.S., and Yurkina, K.V. (1973) Microprobe determination of the mode of deposition of trace elements in zirconbearing pyrochlores and hatchettolites. In: Issledovaniya v oblasti rudno minerabgii (Bezsmertnaya, MS., ed), Nauka Publ. Moscow, (in Russian), 133—45.Google Scholar
Paterson, B.A., Stephens, W.E. and Herd, D.A. (1989) Zoning in granitoid accessory minerals as revealed by backscattered electron imagery. Mineral. Mag., 53, 55–62.CrossRefGoogle Scholar
Pojazitskaja, L.B. and Samoilov, V.S. (1972) Petrology, mineralogy and geochemistry of carbonatites of the Eastern Siberia. Moscow, (in Russian) 265 pp.Google Scholar
Rubin, J.N., Henry, C.D. and Price, J.G. (1993) The mobility of zirconium and other “immobile” elements during hydrothermal alteration. Chem. GeoL, 110, 29–47.CrossRefGoogle Scholar
Williams, C.T. and Giere, R. (1996). Zirconolite: a review of localities worldwide, and a compilation of its chemical composition. Bull. Nat. Hist. Mus. (Geol), 52, 1–24.Google Scholar