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Archaean (2.71 Ga) migmatitic granitoid gneisses

Grid Ref (WGS84 Lat/Long in decimal degrees)

-18.466670, 26.907220
Location: 
Along Bulawayo Falls Road
Stratigraphy: 
Archaean gneisses
Description: 

These are variegated inhomogeneous, polydeformed migmatitic gneisses, with leucocratic quartzo-feldspathic leucosomes and biotitic melanosomes. These migmatitic gneisses are the westernmost dated Archaean rocks of the Zimbabwe Craton. They have zircons which an age of ca. 2.71 Ga (Master et al., 2013a,b)- and they appear to be the source of the 2.7 Ga detrital zircons in the Malaputese Formation meta-arkoses (pink paragneisses), as well as the source of inherited zircons in the Palaeoproterozoic granites intruding the western Magondi Belt. These gneisses would appear to have formed the basement during Magondi Supergroup deposition in the Dete-Kamativi area, and they were intruded by syn-tectonic or orogenic granitoids during the Magondi Orogeny, in what would have been a continental Andean-type magmatic arc. 

Permission: 
N/A
Further Reading: 
Geological Society of Zimbabwe Annual Summer Symposium, Victoria Falls, 28-30 November 2013, Field Excursion Guidebook "An Introduction to the geology and geochronology of the Dete-Kamativi Inlier" by Dr Sharad Master of the Economic Geology Research Institute, School of Geosciences, University of the Witwatersrand, Johannesburg, South Africa, sharad.master@wits.ac.za
Author Credit: 
Sharad Master
Contributed: 
01/12/2013
Updated: 
15/10/2014