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Artificial mixtures of two age populations of muscovite and of biotite were prepared at relative weight percents of 3:1, 1:1, and 1:3 and analyzed by the 40 Ar/ 39 Ar vacuum furnace step-heating method. The original micas are Late Jurassic and Late Cretaceous samples that yield flat age spectra, with plateau ages defined by 97–100% of the gas release and no evidence for excess argon...
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