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Comments on the paper by D.H. Cornell and Å. Pettersson (SAJG, 110, 575–584 (2007)

University of the Free State, Bloemfontein, South Africa e-mail: colliswp.sci@ufs.ac.za; aesc@iafrica.com; praekehe.sci@ufs.ac.za

The first 20% of the full text of this article appears below.

The authors are to be congratulated on excellent new zircon dates that contribute to terrane demarcation in the eastern part of the Namaqua mobile belt. Because we were involved in terrane definition of the mobile belt for some time (e.g. Colliston et al., 1992), we are very interested in all new isotopic data that can place time constraints on the details of the tectonic history of the region. Hopefully these results will lead to more investigations of a similar nature. We agree in broad context with the synthesis of the authors according to which crustal blocks were accreted against the craton from the west (Cornell and Pettersson, Figure 4) but think that it is already possible to supply more detail. Caution is however advised in terrane demarcation lacking mesoscopic field control and based on only a few firm dates. . . . [Full Text of this Article]