1 Introduction</h5> Located in Southern Africa, the Archean Kaapvaal craton ( Fig. 1 ) is one of the oldest, well-exposed continental blocks on Earth. Schematically, its growth proceeded in three steps: (1) formation of a stable nucleus between ~3600 and ~3100 Ma followed by (2) magmatic and tectonic accretion along the northern and western margins of the craton between ~3100 and ~2600 Ma and (3) collision with the Zimbabwe craton to the north, giving rise to the high-grade (granulite-facies) Limpopo mobile belt (e.g. de Wit et al., 1992a; Poujol et al., 2003; Roering et al., 1992; van Reenen et al., 1987 ).</P>The architecture and geological history of the Palaeoarchaean nucleus were extensively studied in terms of geochronology, isotopic geochemistry and metamorphic geology (e.g. Armstrong et al., 1990; Kamo and Davis, 1994; Kröner et al., 1991, 1996; Moyen et al., 2006; Sanchez-Garrido et al., 2011; Zeh et al., 2009 ). Similarly, the tectonic evolution of the Limpopo belt is presently well understood: it results from collision between the Kaapvaal and Zimbabwe craton during Neoarchean times (2650–2600 Ma), followed by a Paleoproterozoic (~2000 Ma) tectonic reworking ( Kramers et al., 2006; Kramers and Houri, 2011; van Reenen et al., 2008
Precambrian Research – Elsevier
Published: Jun 1, 2013
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