oa South African Journal of Geology - K-Ar ages of some Mafic Dykes from the Messina District, Transvaal and their bearing on the age of copper mineralization

Volume 78 Number 3
  • ISSN : 1012-0750
  • E-ISSN: 1996-8590



Mafic dykes of diabasic and doleritic composition are described from the M essina mining district. Since the diabase dyke can be demonstrated to precede copper m ineralization and some dolerite dykes post-date copper mineralization three dykes were selected for K-Ar age determination in order to set limits on the age of copper mineralization. It was not possible to date the metallization with accuracy. The copper mineralization is definitely older than 1 85 m.y. and younger t han I 800 m.y., and it is also probably younger than 700 m.y.

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