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Thermal history of the nakhlites by the40Ar-39Ar method

Authors
Journal
Earth and Planetary Science Letters
0012-821X
Publisher
Elsevier
Publication Date
Volume
19
Issue
2
Identifiers
DOI: 10.1016/0012-821x(73)90108-8

Abstract

Abstract This paper reports the results of thermal-release argon analyses of neutron-irradiated samples of the two nakhlite meteorites, Lafayette and Nakhla. The initiation of retention of radiogenic 40Ar in Lafayette appears to have been a reasonably well-defined event which occurred (1.33 ± 0.03) × 10 9 yr ago, as determined by the 40Ar- 39Ar method. Nakhla also appears to have been retaining argon no longer than 1.3 × 10 9 yr, but its gas-retention age cannot be considered well-defined because its apparently most-retentive sites have nominal gas-retention ages shorter than those of the less-retentive sites which contain most of its potassium.

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