Aspects of volcanism and metamorphism of the Onverwacht group lavas in the South-Western portion of the Barberton greenstone belt.
Date
1994
Authors
Cloete, Marthinus
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Journal ISSN
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Abstract
A volcanological study of the Onverwacht Group in the southwestern part of the
Archaean (-3.5 - 3.2 Ga) Barberton greenstone belt (BGB), South Africa, shows that
volcanic extrusion rates of the Komati and Hooggenoeg Formations must have been high
to have maintained the degree of submarine sheet flooding that is evident. It is
concluded that the volcanic attributes of the Komati and Hooggenoeg Formations are
not typical of MOR crust, as has been claimed, but rather closely resemble those of
modern oceanic plateaus. The shear-zone-bound basal contact of the Komati Formation
suggests that the top of the ancient oceanic plateau was allochthonously emplaced and
delaminated from its basal (intrusive) part. (Abbreviation abstract)
Description
A Dissertation Submitted to the Faculty of Science;
University of the Witwatersrand, Johannesburg; for
the Degree of Doctor of Philosophy
Keywords
Volcanism -- South Africa -- Barberton., Metamorphism (Geology) -- South Africa -- Barberton., Geology -- South Africa -- Barberton.