Dating microstructures by the Ar-40/Ar-39 step-heating technique: deformation-pressure-temperature-time history of the Penninic Units of the Western Alps
White micas from the Penninic units of the Urtier Valley, in the Western Alps, have been dated by the 40Ar/39Ar step-heating method. A strong correlation is observed between measured ages, mica composition and deformation fabrics. Samples characterized by a single mineral reservoir yielded relatively flat age spectra, allowing to estimate an age of 44.4 ± 0.4 Ma for the formation of phengite-bearing fabrics in eclogite facies conditions (SHP) and an age of 42.0 ± 0.4 Ma for the...[Show more]
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