Аннотация:The Chelyabinsk meteorite fell in the vicinity of the town of Chelyabinsk, Russia, on February 15, 2013, and this event was witnessed by thousands of persons. At a height of 30-50 km [11], the meteorite exploded with a flare and broke up into numerous fragments. Its largest fragment (570 kg) was lifted from Chebarkul Lake. We examined a fragment (2 by 1.4 cm) of this meteorite, which had an outermost black fused rind varying from a few fractions of a millimeter to 1 mm in thickness. The meteorite is classed with ordinary chondrites of the LL5/S4-WO class
Our data on the chondrule and matrix minerals allowed us to evaluate the temperature and pressure by the olivine-clinopyroxene-orthopyroxene assemblage. The textural traits of the chondrules and matrix with a normal magmatic crystallization succession of minerals and the narrow ranges of temperature (890-9500C) and pressure (6.1-6.8 kbar) suggest that the minerals crystallized in equilibrium from a chondritic melt at a certain depth in the parent body. Our pressure estimates for clinopyroxene crystallization in the parent body make it possible, , to evaluate the radius of the parent body during the planetary episode of its evolution at 600 - 700 km.