Abstract The Greater Caucasus mountains (Cavcasioni) mark the northern margin of Arabia–Eurasia collision zone. Magmatism in central part began Pleistocene, up to ~25 Myr after initial collision. This paper presents bulk-rock and Sr–Nd–Pb isotope geochemistry from 39 Quaternary volcanic rock samples (<450 Ka) recovered Mt. Kazbek (Kasbegui) region Caucasus, Georgia, assess sources magmat...

Magmatism, ore genesis and metamorphism are commonly associated processes that define fundamental features of the Earth’s crustal evolution from earliest Precambrian to Phanerozoic [...]

Carbonatite volcanism remains poorly understood compared to silicic due the scarcity of carbonatite volcanoes worldwide and because volcanic H2O CO2—major components in systems—are not well preserved rock record. To further our understanding genesis, we utilize non-traditional thallium (Tl) isotope system Khanneshin carbonatites Afghanistan. These contain 250–30,000 ng/g Tl have ε205Tl values (...

[1] Thinning of mantle lithosphere due to Rayleigh-Taylor instability can be a mechanism for triggering continental magmatism near active or recently active plate boundaries. We consider whether it is also plausible as a mechanism for intracontinental magmatism, several hundred kilometers from active subduction or rifting. We perform two-dimensional Rayleigh-Taylor experiments and find that a s...