U-pb dating of niobium minerals from pyrochlor group (ilmeno-vishnevogorsk carbonatitis-miaskite complex, of the southern urals)
| Autor: | Boris Belyatsky, Viktor A. Koroteev, Еlena N. Lepechinа, Viktor V. Sharygin, Irina Nedosekova, Sergei V. Pribavkin |
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| Rok vydání: | 2018 |
| Předmět: |
урал
010504 meteorology & atmospheric sciences Stratigraphy Niobium Geochemistry chemistry.chemical_element ilmeny-vishnevogorsk complex Geology 010502 geochemistry & geophysics минералы группы пирохлора 01 natural sciences ильмено-вишневогорский комплекс u-pbдатирование Geophysics chemistry lcsh:Engineering geology. Rock mechanics. Soil mechanics. Underground construction Geochemistry and Petrology Group (periodic table) the urals lcsh:TA703-712 u-pb dating pyrochlore-group minerals 0105 earth and related environmental sciences |
| Zdroj: | Литосфера, Vol 0, Iss 5, Pp 758-773 (2018) |
| ISSN: | 2500-302X 1681-9004 |
| DOI: | 10.24930/1681-9004-2018-18-5-758-773 |
| Popis: | 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 % UO2) 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. |
| Databáze: | OpenAIRE |
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