ПАЛЛАСИТИ: ОПРОМIНЕННЯ КОСМIЧНИМИ ПРОМЕНЯМИ ТА УДАРНО-ТЕПЛОВА IСТОРIЯ ЗА ДАНИМИ ТРЕКОВИХ I ТЕРМОЛЮМIНЕСЦЕНТНИХ ДОСЛIДЖЕНЬ

Pallasites are specific stony-iron class of meteorites are mixtures of olivine and Fe-Ni. Olivine isone of the suitable silicate mineral for registration heavy cosmic ray nuclei with help of chemically etched tracks.Five meteorites of this class were selected for study by the track and thermoluminescence (TL) methods: Brenham,Eagle Station, Ilimaes, Marjalahti and Omolon. For measurement of the natural and artificially induced TL it wasused high-sensitive TL equipment. The significant difference of the typical glow-curve shapes between pallasites underinvestigation was determined. The total difference was observed in comparison with TL glow-curves, measured inartificially shocked olivine samples. Note that our TL observations indicate on chief connection with the olivinecrystal microstructure and the very low level of possible shock influence recorded in all analysed olivine crystalsamples. It was obtained that the shape of the track-density distribution, observed in the Brenham olivine crystals,supports assumption, that this distribution resembles determined irradiated on pre-compaction stage crystals, whenthe predominant part of tracks represent an addition from the solar cosmic ray VH-nuclei.