Grey gneisses from the Tokwe and Rhodesdale terrains of the Zimbabwe craton have zircon ages of ~3.63, 3.52, and 3.34 Ga, validating the existence of Eo-to Palaeoarchaean crust. In-situ zircon Hf isotope compositions reveal the interplay between episodes of juvenile magma addition, crustal thickening and crustal differentiation. Starting from juvenile mafic crust (with chondritic composition) at ~3.9 Ga, the oldest nucleus of the Zimbabwe craton developed into a stable crustal block by ~3.35 Ga, following a tectonic and mantle evolution that is mirrored by other ancient terrains.
Bibliographical noteFunding Information:
AH acknowledges support by the Department of Geology of the University of Zimbabwe. On behalf of AK, we thank the DFG (grant KR590/9x), the DAAD, and the Hong Kong Research Council. We thank Elis Hoffmann and Oliver Nebel for reviews and Jeff Vervoort for comments on a previous version of the manuscript.
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