Computer Science
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...255.1685b&link_type=abstract
Science (ISSN 0036-8075), vol. 255, March 27, 1992, p. 1685-1687.
Computer Science
21
Antarctic Regions, Chondrites, Meteoritic Composition, Atmospheric Entry, Cosmic Rays, Radioactive Age Determination, Thermoluminescence
Scientific paper
Whether many of the 10,000 meteorites collected in the Antarctic are unlike those falling elsewhere is contentious. The Antarctic H chondrites, one of the major classes of stony meteorites, include a number of individuals with higher induced thermoluminescence peak temperatures than observed among non-Antarctic H chondrites. The proportion of such individuals decreases with the mean terrestrial age of the meteorites at the various ice fields. These H chondrites have cosmic-ray exposure ages of about 8 million years, experienced little cosmic-ray shielding, and suffered rapid postmetamorphic cooling. Breakup of the H chondrite parent body, 8 million years ago, may have produced two types of material with different size distributions and thermal histories. The smaller objects reached earth more rapidly through more rapid orbital evolution.
Benoit Paul H.
Sears Derek W. G.
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