Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..961n&link_type=abstract
Lunar and Planetary Science, volume 27, page 961
Physics
6
Age: Exposure, Age: Terrestrial, Meteorites: Antarctic, Nuclides: Cosmogenic, Shergottite
Scientific paper
Cosmogenic nuclide studies of SNC meteorites have contributed significantly to our understanding of these objects. From cosmic-ray-produced nuclides exposure histories, ejection conditions from the hypothesized martian parent body, and genetic relationships between SNC meteorites are determined. In addition to those nuclides produced by galactic cosmic rays are those produced by solar cosmic rays (SCR). Radionuclides produced by SCRs reside in the uppermost few centimeters of material and their presence in meteorites indicates the degree to which a meteorite has ablated. Previous work shows ablation is less than 1-2 cm in at least three shergottites, ALHA77005, Shergotty, and EETA79001. This suggests that the atmospheric entry velocity and/or entry angle of these shergottites is much lower than the velocity and/or entry angle of ordinary chondrites. We report here the results of cosmogenic radionuclides in the recently recovered Antarctic shergottite Queen Alexandra Range 94201 (QUE94201). We measured 10Be (half-life = 1.5 My), 26Al (0.705 My), and 36Cl (0.301 My) concentrations by AMS.
Caffee Marc W.
Nishiizumi Kuni
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