Mathematics – Probability
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995metic..30q.530k&link_type=abstract
Meteoritics, vol. 30, no. 5, page 530
Mathematics
Probability
Chondrites, Carbonaceous, Glasses, Minerals, Silicate, Tracks, Fossil
Scientific paper
Earlier studies [1,2] showed the storage of fossil natural tracks in some mineral components of Kaidun carbonaceous meteo- rite. Now the results of more detail track study of ~80 mineral grains (ol,px,plag) and ~40 glass fragments picked out of this breccia are presented. The most part of olivine grains (~85%) is characterized by extremely low track density of rho<10^3 cm-2 which is caused by uranium fission fragments. The percen- tages of the other mineral grains having the same rho values are lower, from 15 to 70%. Part of crystals (10-60%) having rho~ 10^4-10^5 cm-2 and those having rho>10^6 cm-2 are considered to irradiate by low-energy VH-nuclei cosmic rays at the pre-accretion stage. The presence of grains having rho>10^6 cm-2 is characteristic of all minerals apart from En. Their percentages among total quantity of crystals under study are different: 6, 10,15 and 25% for ol,an,ab and Ca-px, respectively. No track density gradients were observed in crystals and glass fragments. In one anortite crystal having two track groups with different parameters the pre-accretion irradiation traces were observed in all probability. All the glasses have track densi- ties ranging from 8 10^4 to 3.5 10^6 cm-2. The uranium concentration (C(sub)U) in these glasses measured by us using track method is over the range of 0.24-1.2 ppm. Correlation between the values of rho(sub)nat and C(sub)U was not found. About 15% glasses contain fossil tracks due to early pre-accretion irradiation or due to spontaneous fission of extinct 244Pu. References: [1] Kashkarov L. L. et al. (1990) LPS XXI, 611. [2] Kashkarov L. L. et al. (1992) LPS XXIII, 665.
Kashkarov Leonid L.
Korotkova N. N.
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