Zirconolite, Baddeleyite, Zircon, and Thorite of Island-Arc Quartz Gabbronorite-Dolerites of the Ayu-Dag Intrusive, Crimean Mountains


Citar

Texto integral

Acesso aberto Acesso aberto
Acesso é fechado Acesso está concedido
Acesso é fechado Somente assinantes

Resumo

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.

Sobre autores

E. Spiridonov

Moscow State University

Autor responsável pela correspondência
Email: ernstspiridon@gmail.com
Rússia, Moscow, 119991

S. Filimonov

Moscow State University

Email: ernstspiridon@gmail.com
Rússia, Moscow, 119991

E. Semikolennykh

Karpinsky Russian Geological Research Institute

Email: ernstspiridon@gmail.com
Rússia, St. Petersburg, 119106

N. Korotaeva

Moscow State University

Email: ernstspiridon@gmail.com
Rússia, Moscow, 119991

N. Krivitskaya

Moscow State University

Email: ernstspiridon@gmail.com
Rússia, Moscow, 119991

Arquivos suplementares

Arquivos suplementares
Ação
1. JATS XML

Declaração de direitos autorais © Allerton Press, Inc., 2018