Aspects of volcanism and metamorphism of the Onverwacht group lavas in the South-Western portion of the Barberton greenstone belt.

dc.contributor.author	Cloete, Marthinus
dc.date.accessioned	2017-06-08T10:07:29Z
dc.date.available	2017-06-08T10:07:29Z
dc.date.issued	1994
dc.description	A Dissertation Submitted to the Faculty of Science; University of the Witwatersrand, Johannesburg; for the Degree of Doctor of Philosophy	en_ZA
dc.description.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)	en_ZA
dc.description.librarian	AC2017	en_ZA
dc.identifier.uri	http://hdl.handle.net/10539/22828
dc.language.iso	en	en_ZA
dc.subject	Volcanism -- South Africa -- Barberton.	en_ZA
dc.subject	Metamorphism (Geology) -- South Africa -- Barberton.	en_ZA
dc.subject	Geology -- South Africa -- Barberton.	en_ZA
dc.title	Aspects of volcanism and metamorphism of the Onverwacht group lavas in the South-Western portion of the Barberton greenstone belt.	en_ZA
dc.type	Thesis	en_ZA

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