Computer Science
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983polre..30..259k&link_type=abstract
(National Institute of Polar Research, Symposium on Antarctic Meteorites, 8th, Tokyo, Japan, Feb. 17-19, 1983) National Institut
Computer Science
Antarctic Regions, Chondrites, Geochronology, Meteoritic Composition, Weathering, Argon Isotopes, Calcium, Potassium
Scientific paper
In order to examine the weathering effect on Ar-40 - Ar-39 ages of Antarctic meteorites, the Ar-40 - Ar-39 age patterns were compared for the outer and inner portions of two Antarctic meteorites (ALH-761, ALH-77288). The results indicate that the oxidized outer portions show anomalously old Ar-40 - Ar-39 ages which exceed 4600 Ma in the intermediate temperature fractions of around 800-1000 C. These old Ar-40 Ar-39 ages are accompanied by the increase of Ar-36, which is regarded to be mostly of atmospheric Ar-36. This might be explained by the incorporation of atmospheric Ar in hematite which was produced from geothite during neutron irradiation. The inner relatively fresh portions show the following plateau ages: ALH-761,64, 4487 + or - 50 Ma; ALH-77288,63, 4497 + or 40 Ma.
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