Abstract
The alkaline lamprophyres of Vedi diatreme are composed mostly of green globular volcanic glass and have typical mineral composition for these rocks. Vedi diatreme is located in the Mankouk anticline (Khosrov reserve), where Middle Jurassic ophiolite complex where the obduction took place during the Late Coniacian to Santonian. U-Pb age of pyroclastic rocks of the diatreme is determined 182±3 Ma (n=17) by LA-ICP MS ablation on zircon grains. Broken rims of zircon grains indicate that they are affected by explosion. Alkaline lamprophyres are formed in an extensional environment of a subduction setting.
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