RADIATION-THERMAL HISTORY OF KAIDUN METEO RITE ON DATA OF TRACK STUDYIN SILICATE MINERAL CRYSTALS AND GLASS FRAGMENTS

Track study of similar to 80 silicate mineral crystals (olivine, pyrox ene, plagioclase) and similar to 40 glass fragments (similar to 100 to 300 mu m in size) from Kaidun anomaleous meteorite has been carried o ut. The individual crystals and glasses were hand-picked from both cru shed meteorite matter and its carbonaceous matrix, It is shown that so me individual crystals retained the pre-accretion radiation tracks of low-energy VH-nuclei Solar cosmic rays (CR), Pre-accretion irradiation characteristics of the most representative olivine mineral (percentag e of irradiated grains similar to 10%, value of rho(VH) max up to simi lar to 10(7) cm(-2), and rho(VH) range up to two orders of magnitude) are similar to those values for olivines from Allende CV3 and Kainsaz CO3 chondrites. An anorthite crystal with its own irradiation history was found which is quite different from the bulk meteorite one: it con tains two track generations distinguished by their track densities and track lengths. Ancient tracks in glasses have two sources: the fissio n fragments of extinct Pu-244 and CR VH-nuclei, The presence of ancien t tracks in glasses constraints the temperature of possible short-time heating of Kaidun breccia by values similar to 25O-300 degrees C.