Skip to Main Content
Book Chapter

Neoarchaean tectonic evolution of the Zimbabwe Craton

By
Hielke A. Jelsma
Hielke A. Jelsma
1
CIGCES, Department of Geological Sciences, University of Cape Town, Rondebosch 7701, South Africa
Search for other works by this author on:
Paul H. G. M. Dirks
Paul H. G. M. Dirks
2
School of Geosciences, University of the Witwatersrand, Private Bag 3, WITS 2050, South Africa
Search for other works by this author on:
Published:
January 01, 2002

Abstract

An overview is presented of the field relations, age data and geochemical characteristics of the Neoarchaean granites and greenstones of the Zimbabwe Craton, southern Africa. A major tectono-magmatic event at c. 2.7 Ga produced two distinct greenstone successions. One succession is reminiscent of rift- or back-arc environments and is associated with an old continental fragment. A second succession is indicative of arc magmatism and is associated with juvenile crust. Both were affected by a major accretionary event that, in an apparent sense, swept across the craton between 2.68 and 2.60 Ga. During this 80 Ma time period, concomitant late volcanism, regional deformation, the development of syntectonic sedimentary successions in foreland-type basins, and late syntectonic plutonism took place in selected shear-zone-bounded tectonic domains over limited periods of time (<10–20 Ma). Deformation led to isostatically stable, 30–40 km thick continental crust, without significant exhumation of high-pressure rocks, suggesting that lithospheric shortening was accommodated independently in a rheologically strong upper and weak lower crust. Deformation was followed by pan-cratonic crustal melting and strike-slip shear motions, and led to stabilization of the crust at 2575 Ma, heralded by the emplacement of the Great Dyke.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Special Publications

The Early Earth: Physical, Chemical and Biological Development

C. M. R. Fowler
C. M. R. Fowler
University of London, UK
Search for other works by this author on:
C. J. Ebinger
C. J. Ebinger
University of London, UK
Search for other works by this author on:
C. J. Hawkesworth
C. J. Hawkesworth
University of Bristol, UK
Search for other works by this author on:
Geological Society of London
Volume
199
ISBN electronic:
9781862394476
Publication date:
January 01, 2002

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal