A Dissertation Submitted to the Faculty of Science;
University of the Witwatersrand, Johannesburg; for
the Degree of Doctor of Philosophy / 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) / AC2017
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:wits/oai:wiredspace.wits.ac.za:10539/22828 |
| Date | January 1994 |
| Creators | Cloete, Marthinus |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | application/pdf |
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