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U-Pb dating of niobium minerals from the pyrochlore group (Ilmeny-Vishnevogorsky carbonatite-miaskite complex, South Urals)

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Аннотация

The article covers the U-Pb dating of minerals belonging to the pyrochlore group from the rare-metal ore deposits of Ilmeny-Vishnevogorsky carbonatite-miaskite complex (South Urals). Individual pyrochlore crystals were dated through a new technique of in-situ U-Pb dating using SHRIMP-II, which was developed at VSEGEI (St.Petersburg). The U-Pb dating of high-uranium pyrochlore (more than 2.5 wt % UO2) was carried out employing laser ablation and ICP-MS. The U-Pb systems of studied pyrochlore samples indicate a multi-stage formation of rare-metal niobium mineralisation. The earliest age of ore formation (378 ± 4.9 ma) is yielded by the U-Pb systems of U-bearing pyrochlores from the carbonatites of the Potanino deposit. This period of ore formation is probably associated with the final stages in the crystallisation of the alkaline-carbonatite magmatic system. The next periods of ore formation (230 ± 1.5 Ma) are widely manifested in the Vishnevogorsky and later in the Potanino deposit (217.2 ± 1.9 Ma), which is probably associated with the remobilisation and redeposition of alkaline-carbonatite and rare-metal substances at the post-collision stage in the evolution of Ural carbonatite complexes.

Об авторах

I. L. Nedosekova
Zavaritsky Institute of Geology and Geochemistry, UB RAS
Россия

Irina L. Nedosekova

15 Akad. Vonsovsky St., Ekaterinburg, 620016



V. A. Koroteev
Zavaritsky Institute of Geology and Geochemistry, UB RAS
Россия

Viktor A. Koroteev

15 Akad. Vonsovsky St., Ekaterinburg, 620016



B. V. Belyatsky
A.P. Karpinsky Russian Geological Research Institute (VSEGEI)
Россия

Boris V. Belyatsky

74 Sredny ave., St.Petersburg, 199106



V. V. Sharygin
V.S. Sobolev Institute of Geology and Mineralogy SB RAS; Novosibirsk State University
Россия

Viktor V. Sharygin

3 Akad. Koptuga ave., Novosibirsk, 630090; 2 Pirogova St., Novosibirsk, 630090



Е. N. Lepechinа
A.P. Karpinsky Russian Geological Research Institute (VSEGEI)
Россия

Еlena N. Lepechinа

74 Sredny ave., St.Petersburg, 199106



S. V. Pribavkin
Zavaritsky Institute of Geology and Geochemistry, UB RAS
Россия

Sergei V. Pribavkin

15 Akad. Vonsovsky St., Ekaterinburg, 620016



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Для цитирования:


Nedosekova I.L., Koroteev V.A., Belyatsky B.V., Sharygin V.V., Lepechinа Е.N., Pribavkin S.V. U-Pb dating of niobium minerals from the pyrochlore group (Ilmeny-Vishnevogorsky carbonatite-miaskite complex, South Urals). Литосфера. 2018;18(5A):90-101.

For citation:


Nedosekova I.L., Koroteev V.A., Belyatsky B.V., Sharygin V.V., Lepechinа Е.N., Pribavkin S.V. U-Pb dating of niobium minerals from the pyrochlore group (Ilmeny-Vishnevogorsky carbonatite-miaskite complex, South Urals). LITHOSPHERE (Russia). 2018;18(5A):90-101.

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