Zirconolite of alkaline pegmatites of the Vishnevye mountains: the first findings in the South Urals
V.A. Popov, V.I. Popova, I.A. Blinov, V.A. Kotlyarov
UDК 549.5 (470.55)
Zirconolite, a complex oxide with an idealized formula (Ca,REE)Zr(Ti,Fe,Nb)2O7, is an accessory mineral of Nb ores from alkali pegmatites and carbonatites of the Vishnevogorsk alkaline complex (South Urals, Russia). Tabular grains of zirconolite (3-25 μm across) occur in assemblages with pyrochlore, zircon, titanite, ilmenite, and calcite. The chemical composition of zirconolite (wt. %, Fe is considered as Fe2+) is as follows: CaO 8.5-9.3; Y2O3 0.0-1.3; REE2O3 10.0-12.2; ZrO2 28.8-29.6; TiO2 24.4-25.5; Nb2O5 13.1-13.4; Ta2O5 1.1-2.0; FeO 7.3-8.6; total 97.9-99.5. The average chemical composition of the mineral is close to formula CaREEZr2Ti2NbFe2+O14.
Figures 4. Table 2. References 8.
Key words: zirconolite, alkali pegmatites, Vishnevye Mountains, South Urals.
V.A. Popov, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia; popov@mineralogy.ru
V.I. Popova, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia;
I.A. Blinov, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia;
V.A. Kotlyarov, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia
- Bonshtedt-Kupletskaya, E.M. (1951) [Mineralogy of alkali pegmatites of the Vishnevye Mountains]. Moscow, Academy of Sciences of USSR, 176 p. (in Russian)
- Chukanov N.V., Krivovichev S.V., Pakhomova A.S., Pekov I.V., Schäfer Ch., Vigasina M.F., Van K.V. (2014) Laachite, (Ca,Mn)2Zr2Nb2TiFeO14, a new zirconolite-related mineral from the Eifel volcanic region, Germany. European Journal of Mineralogy, 26, 103-111.
- Chukanov N.V, Krivovichev S.V., Pakhomova A.S., Pekov I.V, Schäfer Ch., Vigasina M.F., Van K.V. (2014) Laachite, (Ca,Mn)2Zr2Nb2TiFeO14, a new zirconolite-related mineral from the Eifel volcanic region, Germany. European Journal of Mineralogy, 26, 103-111.
- Kapustin Yu.L. (1971) [Mineralogy of carbonatites]. Moscow, Nauka, 288 p. (in Russian)
- Makagonov E.P., Kotlyarov VA. (2008) [Ba and Sr mineralization of the Ilmenogorsky miaskite complex]. Uralskiy mineralogicheskiy sbornik [Urals Mineralogical Collection], (15), 27-34. (in Russian)
- Medvedeva E.V, Nemov A.B., Kotlyarov VA. (2016) [Banalsite-stronalsite from sandyite of the Ilmenogorsk miaskite complex (Southern Urals)]. Mineralogiya [Mineralogy], 3(1), 3-8. (in Russian)
- Sharygin V.V., Doroshkevich A.G., Khromova E.A.
(2016) [Nb-Fe minerals of the zirconolite group in calcite carbonatites of the Belaya Zima massif (East Sayany)]. Mineralogiya [Mineralogy], 3(4), 3-18. (in Russian) - Williams C.T., Gieré R. (1996) Zirconolite: a review of localities worldwide, and a compilation of its chemical compositions. Bulletin of the Natural History Museum London (Geology), 52, 1-24.
- Zubkova N.V, Chukanov N.V, Pekov I.V, Ter-nes B., Schüller W., Ksenofontov D.A., Pushcharovsky D.Yu. (2018) The crystal structure of nonmetamict Nb-rich zirconolite-3 T from the Eifel paleovolcanic region, Germany. Zeitschrift für Kristallografe, 233(7), 463-468.
МINERALOGY № 3 2018