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EUDIALYTE-GROUP MINERALS IN RARE-METAL NEPHELINE SYENITES OF THE KHASHATYN-KHAR MASSIF (NORTHWESTERN MONGOLIA): INDICATORS OF POTENTIAL RARE-METAL ORE MINERALIZATIONстатья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 1 апреля 2026 г.
- Авторы: Nikiforov A.V., Moroz U.A., Yarmolyuk V.V., Gritsenko U.D., Kozlovsky A.M., Polyakov N.A., Khertek A.K.
- Журнал: Geology of Ore Deposits
- Том: 67
- Номер: 6
- Год издания: 2025
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 852
- Последняя страница: 871
- DOI: 10.1134/S1075701524600348
- Аннотация: The Khashatyn-Khar syenite massif is located in Caledonian fold structures of the southern frame of the Tuva–Mongolian Superterrane. Nepheline syenites and numerous dykes consisting of agpaitic varieties of nepheline syenite with aegirine, pectolite–serandite series minerals, fluorite, and eudialyte-group minerals (EGMs), are developed in the apical part of the massif. Compared with other rock varieties of the massif, these rocks are enriched in Zr, Nb, and rare-earth elements, and they enclose EGMs. Less common minerals in the dykes vary widely in terms of quantitative and species composition. This is the result of both variations in the initial melt composition and autometasomatic rock transformations caused by interaction with water-rich intergranular restite melts. Primary EGMs include EGMs of a continuous series from Fe-rich (up to 4.8 wt % FeOtot), Na-poor (up to 3.4 wt %), and water-rich (up to 8.6 wt %), which are similar in composition to ilyukhinite, as well as to Na-rich species (up to 10.9 wt %) similar to georgbarsanovite and davinciite...
- Добавил в систему: Гриценко Юлия Дмитриевна