Other
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..82..223e&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 82, no. 3-4, April 1987, p. 223-230. NASA-supported research.
Other
16
Aluminum 26, Antarctic Regions, Meteoritic Composition, Chondrites, Gamma Ray Spectra, Radioactive Age Determination, Meteorites, Antarctic Meteorites, Aluminum 26, Isotopes, Alh Meteorites, Samples, Meteorite, Abundance, Spectrometry, Gamma Ray Methods, Catalog, Yamato Meteorites, Comparisons, Saturation, Terrestrial Age, Procedure, Data, Rkp Meteorites, Met Meteorites, Btn Meteorites, Mbr Meteorites, Eet Meteorites, Ott Meteorites, Stony Meteorites, H Chondrites, L Chondrites, Ll Chondrites
Scientific paper
An Al-26 survey by nondestructive gamma ray spectrometry was conducted as part of the preliminary examination effort for Antarctic meteorites. A total of 220 samples were studied. The majority of the samples were from the Allan Hills area; however, samples from several other sites, including the Yamato Mountains, were studied. Compared to worldwide falls and finds, the Antarctic group shows a clear trend toward lower Al-26 levels. At least 10 percent of the samples studied were clearly undersaturated in Al-26. The frequency of undersaturated samples suggests that terrestrial ages of several hundred thousand years are common among the Antarctic meteorite collection. The absence of samples with extremely low Al-26 implies that the upper limit for terrestrial ages in the Antarctic is on the order of 1 million years.
Evans John C. Jr.
Reeves James H.
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