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Minerals of zirconolite group from fenitized xenoliths in nepheline syenites of Khibiny and Lovozero plutons, Kola Peninsula

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Abstract

Zirconolite, its Ce-, Nd-, and Y-analogs, and laachite, another member of the zirconolite group, are typomorphic minerals of the fenitized xenoliths in nepheline syenite and foidolite of the Khibiny–Lovozero Complex, Kola Peninsula, Russia. All these minerals are formed at the late stage of fenitization as products of ilmentie alteration under the effect of Zr-bearing fluids. The diversity of these minerals is caused by the chemical substitutions of Na and Ca for REE, Th, and U compensated by substitution of Ti and Zr for Nb, Fe and Ta, as well as by the redistribution of REE between varieties enriched in Ti (HREE) or Nb (LREE). The results obtained can be used in the synthesis of Synroc-type titanate ceramics assigned for the immobilization of actinides.

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Correspondence to Yu. A. Mikhailova.

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Original Russian Text © Yu.P. Menshikov, Yu.A. Mikhailova, Ya.A. Pakhomovsky, V.N. Yakovenchuk, G.Yu. Ivanyuk, 2014, published in Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, 2014, No. 4, pp. 60–72.

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Menshikov, Y.P., Mikhailova, Y.A., Pakhomovsky, Y.A. et al. Minerals of zirconolite group from fenitized xenoliths in nepheline syenites of Khibiny and Lovozero plutons, Kola Peninsula. Geol. Ore Deposits 57, 591–599 (2015). https://doi.org/10.1134/S1075701515070089

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  • DOI: https://doi.org/10.1134/S1075701515070089

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