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Economic Geology; January 2005; v. 100; no. 1; p. 87-114; DOI: 10.2113/100.1.0087
© Society of Economic Geologists

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FIG. 14. ⁴⁰Ar-³⁹Ar step-heating spectra for supergene alunite group minerals (Table 4). Min = minimum age, PA = plateau age, TPA = "technical plateau" age (comprising 3 or more steps but less than 50% of total ³⁹Ar released).

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