The composition and structure of xenocrystals and depth inclusions in picrites of chetlass stone

The characteristics of deep minerals and inclusions from picrite rocks of Chetlass Stone of the Middle Timan is given. The features of the chemical composi- tion of olivine, chromium clinopyroxenes, diopside, magnetite, garnet pyropealmandine series, chrome spinel and zircon from xenocrystals and deep inclusions of ultramafic composition of different genetic origin are considered in detail. The conditions for crystallization of the olivine+chrome spinel+chro- mopentienic association of clinopyroxene were estimated, which made it possible to classify Chetlass dyke complex as the spinelpyroxene facies of the upper mantle, which pressure and temperature differ significantly from the conditions of diamond stabilization.