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

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.