Abstract
40 Ar 39 Ar dating of very fine-grained materials is compromised by the loss of 39Ar by recoil, and also sometimes other Ar isotopes, during irradiation. An encapsulated sample 40 Ar 39 Ar procedure is described which overcomes this problem and which produces a K-Ar equivalent date. Measurements indicate that the procedure yields reliable and reproducible results. It offers the potential for dating small amounts of material of many types, for example very fine-grained authigenic sheet silicates from rock cores, which may suffer Ar loss during irradiation.
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