Comment on: New PGE and Re/Os-isotope data from lower crustal sections of the Vredefort dome and a reinterpretation of its “crust-on-edge” profile: R.J. Hart, I. McDonald, M. Tredoux, M.J. de Wit, R.W. Carlson, M. Andreoli, D.E. Moser and L.D. Ashwal (Vol. 207 (1/2), 173–184)

Ever since Slawson (1976) suggested that the Archaean crystalline basement rocks in the core of the Vredefort dome southwest of Johannesburg might represent “crust-on-edge”, debate has existed about the extent to which the deep crust was exhumed by the ~2.02 Ga, impact-induced doming event. In a suite of papers since 1981, Hart and co-workers (Hart et al., 1981; 1990a; b; 2004; De Wit et al., 1992; Tredoux et al., 1999; Moser et al., 2001; Flowers et al., 2003) postulated that doming (and subsequent erosion) exposed a...