VH-NUCLEI COSMIC-RAY TRACKS IN CHONDRITES AS INDICATORS FOR RADIATION-THERMAL HISTORY OF THE METEORITE MATTER AT THE EARLY-STAGE OF SOLAR-SYSTEM PRIMARY BODY FORMATION

VH-nuclei cosmic-ray track study in silicate mineral grains extracted from matrix and chondrules of no enriched by solar gas chondrites has been performed. A broad range of track densities, typical track densit y grouping and absence of track density gradients have been observed i n these grains, The traces Of low energy cosmic-ray VH-nuclei particle s that were stored at the early pre-accretion history of the meteorite parent body formation have been established.