Age and genetic interrelation of ultramafic rocks, rodingites and chlorite-carbonate rocks of the Karabash massif (South Urals)

• Main Authors: A. A. Krasnobaev, P. M. Valizer
• Format: Article
• Language: English
• Published: A.N. Zavaritsky Institute of Geology and Geochemistry 2016-06-01
• Series: Литосфера
• Subjects: цирконы; гипербазиты; родингиты; хлорит-карбонатные породы; возраст; эволюция; метасоматические растворы; zircons; ultramafic rocks; rodingite; chlorite-carbonate rocks; age; evolution; metasomatic fluids
• Online Access: https://www.lithosphere.ru/jour/article/view/27
• ISSN: 1681-9004; 2500-302X

The age of ulramafic rocks of the Karabash massif (1720-1740 Ma), the minimum age of their protolith (1830 Ma), and the age of formation of rodingites (438.5 ± 15 Ma) and chlorite-carbonate rocks (404.4 ± 8.8 Ma) were determined on the basis of the SHRIMP analysis of zircons. The rocks were finally transformed 310-315 Ma ago. The ultramafic rocks were the important part over the entire evolution of the massif. The late zircons were formed from the U-rich fluids. Absolutely new variety of zircons, which indicate the participation of another source, was crystallized only in chlorite-carbonate rocks.