![]() ![]() The Khor Temiki enstatite and pyroxene seem to have suffered less diffusion loss than even the lunar minerals. ![]() Ilmenite is the most retentive lunar mineral studied there has been some diffusion loss of He, but little or no diffusion loss of Ne and heavier gases. It has also been shown that there are track-rich'' grains in the dark portions of gas-rich meteorites, as well as the normal grains, and indications were obtained that, in addition to their exposure to solar-wind particles, these track-rich'' grains were exposed to solar-flare particles of energies up to a few MeV/nucleon for ~10/sup 4/ yr before accreting into the meteorite, and there is a correlation between the abundance of track-rich'' grains and the concentration of trapped rare gases. ![]() It has been suggested that the rnain fraction of the rare gases present in gas-rich meteorites was probably incorporated by the solar wind into the grain surfaces, which later were accreted into the meteorite breccias, and in some experiments on Khor Temiki(a gas-rich aubrite) it was shown that most of the gas was surfacecorrelated and resided in the superficial micron or less, consistent with the range of solar wind ions (0.05 to 0.1 mu m). ![]()
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