The Stukpan carbonatite in the Orange Free State Goldfield

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dc.contributor.authorVerwoerd W.J.
dc.contributor.authorWeder E.E.W.
dc.contributor.authorHarmer R.E.
dc.date.accessioned2011-05-15T16:00:35Z
dc.date.available2011-05-15T16:00:35Z
dc.date.issued1993
dc.description.abstractThe Stukpan Complex is interpreted to be an oval pipe-like body, 3.1 × 1.7 km in diameter, unconformably overlain by Karoo strata and a dolerite sill. One borehole penetrated an intrusive contact between fine-grained amphibole-rich calciocarbonatite and an alkaline amphibolite derived by fenitization from andesitic Ventersdorp lava. A second borehole encountered calciocarbonatite sills as well as red fenite and brecciated quartzite belonging to the Welkom Formation of the Central Rand Group. Geochemical logs show consistently high Sr contents in the carbonatite but low P, Nb, Zr, and REE. Despite erratic Cu and Ni values and sporadic sulphides no indications of economic mineralization have been found. Rb-Sr mineral separate geochronology yielded a well-constrained isochron age of 1354 ± 11 Ma for the carbonatite and confirmed a Ventersdorp (2700 Ma) age for the alkaline amphibolite. -from Authors
dc.identifier.citationSouth African Journal of Geology
dc.identifier.citation96
dc.identifier.citation3
dc.identifier.issn10120750
dc.identifier.urihttp://hdl.handle.net/10019.1/11778
dc.subjectcarbonatite
dc.subjectgeochemistry
dc.subjectpetrogenesis
dc.subjectpetrology
dc.subjectSouth Africa, Orange Free State, Stukpan Complex
dc.titleThe Stukpan carbonatite in the Orange Free State Goldfield
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