Carbon and U-Pb evidence for a palaeoproterozic crustal component in the Central Zone of the Limpopo Belt, South Africa

From: Journal of the Geological Society | Date: July 1, 2003| Author: | Copyright information

Abstract: Supposedly mid-Archaean (c. 3.3 Ga) granulite-grade marbles from the Gumbu Group, Central Zone, Limpopo Belt (South Africa) have anomalously high [delta]^sup 13^C values (+4.6 to +7[per thousand]) interpreted as minimum values for their limestone protoliths. Such elevated [delta]^sup 13^C values are unknown in any Archaean carbonate worldwide, but occur in Palaeoproterozoic (c. 2.4-2.1 Ga) carbonates; for example, on the adjacent Zimbabwe and Kaapvaal cratons. This suggests that the Central Zone contains a previously unrecognized Palaeoproterozoic cover sequence, contrary to the ...

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