Other
Scientific paper
Feb 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35..157p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 35, Issue 2, pp.157-173
Other
7
Scientific paper
Argon analyses are presented for stepwise heating of nine specimens of seven neutron-irradiated meteorites, and potassium-argon ages calculated by the Ar 40 -Ar 39 method. Within the limitations of the data, it is found that the chondrites Karoonda, St. Severin and Allegan, and the aubrites Peña Bianca Spring and Bishopville, all have identical potassium-argon gas retention ages, assumed to be 4.6 × 10 9 yr. In particular, Bishopville, for which conflicting age results have been reported, has the same K-Ar age as the chondrites and Peña Bianca Spring. For these five meteorites, there is no evidence for significant loss of radiogenic Ar 40 , such as has been observed in hypersthene chondrites. Gas released at low extraction temperatures indicates that a silicate inclusion from the hexahedrite El Taco experienced a heating event 3.4 × 10 9 yr ago. Gas released from El Taco silicate at higher extraction temperatures yields a K-Ar age identical to that of the chondrites, large amounts of trapped Ar 38 , and indicates a ratio in the trapped argon. The results for separated chondrules and matrix of the unequilibrated chondrite Chainpur differ qualitively from those observed for other meteorites in a manner for which no tenable explanation is offered.
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