Zirconolite, Baddeleyite, Zircon, and Thorite of Island-Arc Quartz Gabbronorite-Dolerites of the Ayu-Dag Intrusive, Crimean Mountains
- 作者: Spiridonov E.1, Filimonov S.1, Semikolennykh E.2, Korotaeva N.1, Krivitskaya N.1
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隶属关系:
- Moscow State University
- Karpinsky Russian Geological Research Institute
- 期: 卷 73, 编号 6 (2018)
- 页面: 538-548
- 栏目: Article
- URL: https://journals.rcsi.science/0145-8752/article/view/174848
- DOI: https://doi.org/10.3103/S0145875218060121
- ID: 174848
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详细
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.
作者简介
E. Spiridonov
Moscow State University
编辑信件的主要联系方式.
Email: ernstspiridon@gmail.com
俄罗斯联邦, Moscow, 119991
S. Filimonov
Moscow State University
Email: ernstspiridon@gmail.com
俄罗斯联邦, Moscow, 119991
E. Semikolennykh
Karpinsky Russian Geological Research Institute
Email: ernstspiridon@gmail.com
俄罗斯联邦, St. Petersburg, 119106
N. Korotaeva
Moscow State University
Email: ernstspiridon@gmail.com
俄罗斯联邦, Moscow, 119991
N. Krivitskaya
Moscow State University
Email: ernstspiridon@gmail.com
俄罗斯联邦, Moscow, 119991