Zirconolite, Baddeleyite, Zircon, and Thorite of Island-Arc Quartz Gabbronorite-Dolerites of the Ayu-Dag Intrusive, Crimean Mountains
- Авторы: Spiridonov E.1, Filimonov S.1, Semikolennykh E.2, Korotaeva N.1, Krivitskaya N.1
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Учреждения:
- Moscow State University
- Karpinsky Russian Geological Research Institute
- Выпуск: Том 73, № 6 (2018)
- Страницы: 538-548
- Раздел: Article
- URL: https://journals.rcsi.science/0145-8752/article/view/174848
- DOI: https://doi.org/10.3103/S0145875218060121
- ID: 174848
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Аннотация
The Early Bajocian island-arc quartz gabbronorite-dolerites of the Ayu-Dag intrusive contain syngenetic zirconolite and baddeleyite. Zirconolite includes Ca-dominant and atypical Y-dominant (Y, Ca, Th, REE)2FeZr2Ti3O14 varieties. Two genetic types of zircon and thorite occur. The dominant xenogenic zircon-I with thorite inclusions and numerous melting traces (lacunes) is enriched in Hf, Th, Y, and P (up to 6 wt % HfO2, 5 wt % ThO2, 6 wt % Y2O3, 3 wt % P2O5). Thorite contains 7–9 wt % UO2. Zircon-I and thorite-I of similar compositions are typical minerals of highly radioactive granites. The isotope age of xenogenic zircon is more than 2 Ga. Rare syngenetic zircon-II is extremely depleted in Th, U, Y, and Hf. Thus, the Ayu-Dag basic magma was contaminated by Early Precambrian highly radioactive granites, whose bodies probably occur in the basement of Crimean Mountains.
Об авторах
E. Spiridonov
Moscow State University
Автор, ответственный за переписку.
Email: ernstspiridon@gmail.com
Россия, Moscow, 119991
S. Filimonov
Moscow State University
Email: ernstspiridon@gmail.com
Россия, Moscow, 119991
E. Semikolennykh
Karpinsky Russian Geological Research Institute
Email: ernstspiridon@gmail.com
Россия, St. Petersburg, 119106
N. Korotaeva
Moscow State University
Email: ernstspiridon@gmail.com
Россия, Moscow, 119991
N. Krivitskaya
Moscow State University
Email: ernstspiridon@gmail.com
Россия, Moscow, 119991