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

I.S. Buick, I.S. Williams, R.L. Gibson, I. Cartwright and J.A. Miller
Journal of the Geological Society, 160, 601-612, 1 July 2003, https://doi.org/10.1144/0016-764902-059
I.S. Buick
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I.S. Williams
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R.L. Gibson
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I. Cartwright
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Abstract

Supposedly mid-Archaean (c. 3.3 Ga) granulite-grade marbles from the Gumbu Group, Central Zone, Limpopo Belt (South Africa) have anomalously high δ13C values (+4.6 to +7‰) interpreted as minimum values for their limestone protoliths. Such elevated δ13C 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 prevailing view. This conclusion is supported by zircon U–Pb sensitive high-resolution ion microprobe ages from two metasediments, which, in addition to c. 2.02 Ga metamorphic zircon overgrowths, contain detrital zircons no older than c. 2.68 Ga, and some possibly as young as c. 2.2 Ga. The recognition of post-3.3 Ga metasediments in the Central Zone requires a major revision of models of the tectonic evolution of the Limpopo Belt.

  • Precambrian
  • Limpopo Belt
  • carbon isotopes
  • age
  • © 2003 The Geological Society of London
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Journal of the Geological Society: 160 (4)
Journal of the Geological Society
Volume 160, Issue 4
July 2003
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Carbon and U–Pb evidence for a Palaeoproterozoic crustal component in the Central Zone of the Limpopo Belt, South Africa

I.S. Buick, I.S. Williams, R.L. Gibson, I. Cartwright and J.A. Miller
Journal of the Geological Society, 160, 601-612, 1 July 2003, https://doi.org/10.1144/0016-764902-059
I.S. Buick
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I.S. Williams
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R.L. Gibson
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I. Cartwright
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J.A. Miller
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Carbon and U–Pb evidence for a Palaeoproterozoic crustal component in the Central Zone of the Limpopo Belt, South Africa

I.S. Buick, I.S. Williams, R.L. Gibson, I. Cartwright and J.A. Miller
Journal of the Geological Society, 160, 601-612, 1 July 2003, https://doi.org/10.1144/0016-764902-059
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