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- W2912178440 abstract "U-Pb dating of the pyrochlore-group minerals from the Nb-rare metal ore deposits of ilmeny-vishnevogorsky carbonatite-miaskite complex of the Ural fold region was carried out. To date the individual pyrochlore crystals were used a new technique of local U-Pb SHRIMP-II dating which was developed at the CIR VSEGEI (St.Petersburg). In the case of high-U pyrochlore (with more than 2.5 wt % UO 2 ) a laser ablation and ICP-MS method was applied for U-Pb-dating. The studied isotope pyrochlore system indicates a multi-stage formation of rare metal niobium mineralization. The earliest age of ore formation (378 ± 4.9 Ma) is fixed by U-pychlore isotope systems of Potanino deposit. This stage of ore formation is probably associated with the final stages of the alkaline-carbonatite magmatic system crystallization. The next stages of ore formation (230 ± 1.5 Ma) are widely manifested in Vishnevogorsk and later on the Potanino deposit (217.2 ± 1.9 Ma) and were probably related to remobilization and redeposition of alkaline-carbonatite and rare metal substances." @default.
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- W2912178440 date "2018-10-28" @default.
- W2912178440 modified "2023-10-06" @default.
- W2912178440 title "U-pb dating of niobium minerals from pyrochlor group (ilmeno-vishnevogorsk carbonatitis-miaskite complex, of the southern urals)" @default.
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- W2912178440 doi "https://doi.org/10.24930/1681-9004-2018-18-5-758-773" @default.
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