Precise zircon SHRIMP U–Pb dating suggests that the Bogda high-alumina basaltic lavas were erupted at 315–319 Ma.
High Al content of the Bogda basalt is due to high crystallization pressure rather than water content.
The sector and oscillatory zoning in Cpx phenocrysts is attributable to rapid dynamic crystallization during magma ascent.
The occurrence of the Bogda HABs suggests an island arc environment in the Late Carboniferous.