Research paperRbSr and 40Ar39Ar laser probe dating of high-pressure phengites from the Sesia zone (Western Alps): underscoring of excess argon and new age constraints on the high-pressure metamorphism
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2023, Earth and Planetary Science LettersCryptic excess argon in metamorphic biotite: Anomalously old <sup>40</sup>Ar/<sup>39</sup>Ar plateau dates tested with Rb/Sr thermochronology and Ar diffusion modelling
2021, Geochimica et Cosmochimica ActaCitation Excerpt :This study uses Rb/Sr biotite geochronology to test for the presence of cryptic excess 40Ar in biotites of the Albany-Fraser Orogen of Western Australia. Because Ar and Sr have similar closure temperatures in biotite, the 40Ar/39Ar and Rb/Sr geochronometers should yield similar dates; if the 40Ar/39Ar dates are significantly older than the Rb/Sr dates, cryptic excess 40Ar may be present (e.g. Ruffet et al., 1997; Batt et al., 2000; Willigers et al., 2004). Subsequent diffusion modelling of 40Ar/39Ar step-heating plateaus is used to test different models for the incorporation and distribution of excess 40Ar in the biotite crystal lattice.
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2020, Gondwana ResearchCitation Excerpt :Two batches of Mn oxide samples from Kasekelesa (RGM series) and Mwene-Ditu, Kasai (RG series), were analyzed by the 40Ar/39Ar method in step-heating using a CO2 laser probe coupled with a MAP 215 mass spectrometer. The procedure was described by Ruffet et al. (1991, 1995, 1997). Irradiation of samples was performed at Mac Master Nuclear Reactor (Hamilton, Ontario, Canada) in the 8C facility.