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The greenstone belts of ZimbabweThe present configuration of the greenstone belts is explained. Three ages of granite-greenstone terrain can be recognized within the Zimbabwe Archean Craton. The oldest greenstone belt remnants constitute the volcano-sedimentary Sebakwian group dated at c. 3.5 Ga minimum on the evidence from various granites and gneisses. The more extensive, main greenstone belts comprise the dominantly volcanic Bulawayan Group and dominantly sedimentary Shamvaian Group. An unconformity within the Bulawayan Group allows its subdivision into the Lower and Upper Greenstones. The Lower Greenstones possibly form part of a granite-greenstone terrain about 2.9 Ga old. The widespread Upper Greenstones and the locally developed, unconformably overlying Shamvaian Group are about 2.7 Ga old. Two suites of late granites post-date the main greenstone belts. These comprise that tonalitic Sesombi Suite at c. 2.7 Ga and the more potashrich Chilimanzi Suite at c. 2.6 Ga.
Document ID
19840012900
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wilson, J. F.
(Zimbabwe Univ. Salisbury, Zimbabwe)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Publication Information
Publication: Lunar and Planetary Inst. Workshop on a Cross Section of Archean Crust
Subject Category
Geophysics
Accession Number
84N20968
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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