stripes
Occurrence number:
151-00-020
Country:
South Africa
Region:
Pienaars River Alkaline Complex (Franspoort Line)
Location:
Longitude: 28.22, Latitude: -25.42
Carbonatite:
No
This plug intrudes Bushveld granite but its extent is not known because it is partly overlain by Karoo sediments. It comprises quartz-hornblende syenites but, although petrographic details have not been located, it is considered likely to be peralkaline.
Age:
An imprecise Rb-Sr isochron age of 1529±233 Ma was obtained on five whole rock samples, but this was improved to 1361±142 Ma by inclusion of data from feldspars separated from three of the rocks (Harmer, 1985).
References:
HARMER, R.E. 1985. Rb-Sr isotopic study of units of the Pienaars River alkaline complex, north of Pretoria, South Africa. Transactions of the Geological Society of South Africa, 88: 215-23.VERWOERD, W.J. 1967. The carbonatites of South Africa and South West Africa. Geological Survey of South Africa, Handbook, 6: 1-452