Alexandre et al.(2006) recently presented the results of a detailed structural study of brittle-ductile deformation, which could, as they state, be seemingly coincident with regional low-grade metamorphism of the pre-2.15 Ga Transvaal Supergroup strata between the Vredefort impact structure of ~2.02 Ga age (Kamo et al., 1996; Gibson et al., 1997) and the Bushveld Complex that was intruded at ~2.06 Ga (Walraven, 1997; Buick et al., 2001). Alexandre et al.(2006) also performed six 40Ar/39Ar step-heating dating experiments with synkinematic white mica specimens. The results comprise ages...

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