3.63 Ga grey gneisses reveal the Eoarchaean history of the Zimbabwe craton

A. HOFMANN, A. KRÖNER, L. M. IACCHERI, J. WONG, H. GENG, H. XIE

Research output: Journal PublicationsJournal Article (refereed)peer-review

9 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalSouth African Journal of Geology
Volume125
Issue number1
DOIs
Publication statusPublished - Mar 2022
Externally publishedYes

Bibliographical note

Funding 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.

Publisher Copyright:
© 2022 Geological Society of South Africa. All rights reserved.

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