Exposure History of the Lunar Meteorite EET 87521 Based on the Track Data

Details Exposure History of the Lunar Meteorite EET 87521 Based on the Track Data Exposure History of the Lunar Meteorite EET 87521 Based on the Track Data

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995metic..30q.526k&link_type=abstract

Meteoritics, vol. 30, no. 5, page 526

Other

Meteorites, Elephant Moraine 87521, Lunar, Track Density Distribution, Track-Rich Olivine Grains

Scientific paper

We report the preliminary results of our fossil track analyses on the olivine grain samples extracted from brecciated basaltic lunar meteorite EET 87521 [1], the matrix chip of which (~0,1 g) was obtained from the meteoritic group of the NASA Cosmic Center. Track-density rho-values, measured in the olivine grains (about 50 samples 50-200 micrometers in size) are in interval of (2.10^4-2.10^6) cm^-2, that is out of the statistical range, observed in individual grains.About 70% of grains have about the same rho-values of (5,1+/-1,7) 10^5 cm^-2. Gradient rho from the edge into volume of the grain was observed only for three samples. Conclusions :1) By the total irradiation dose from VH-nuclei of cosmic rays (CR) samples of the lunar meteorites EET 87521 relate to the lunar matter having comparatively low exposure degree that agrees with very low activities of the radionuclides 10Be and 26Al [2] and the lowest exposure CR age among other lunar meteorites [3] 2) Heterogenous character of the grain rho-values distribution correlates with formation of this breccia from the crystals and rock fragments which obtained the different solar CR VH-nuclei exposure dose during their deposition under thin (<10^-3 g/cm^2 ) material layer. 3) Impact process of this breccia formation did not resulted in heating up to total track annealing temperature. References: [1] Lindstrom M. M. et al. (1991) LPS XXII, 817-818. [2] Vogt S. et al. (1991) LPS XXII, 1449-1450. [3] Eugster O. et al. (1991) LPS XXII, 357-358.

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