The nature and origin of the Barrovian metamorphism, Scotland: 40 Ar/ 39 Ar apparent age patterns and the duration of metamorphism in the biotite zone
A geochronological traverse across the Barrovian metamorphic series, Scotland, shows 40Ar/ 39Ar apparent age spectra that reflect the influence of progressive metamorphism during the Grampian orogenic episode. The lowest-grade units of the Barrovian metamorphic series retain pre-Grampian detrital ages as components of their white mica 40Ar/ 39Ar apparent age spectra. These relict ages are progressively obliterated in the direction of increasing metamorphic grade, with a Grampian-age 40Ar/ 39Ar...[Show more]
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|Source:||Journal of the Geological Society|
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