Kalahari Craton | geological region, Africa | Britannica (original) (raw)

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African geology

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  In Africa: General considerations
  ancient Precambrian cratons—Kaapvaal, Zimbabwe, Tanzania, Congo, and West African—that were formed between about 3.6 and 2 billion years ago and that basically have been tectonically stable since that time; those cratons are bounded by younger fold belts formed between 2 billion and 300 million years ago. All of…
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  In Africa: The Precambrian
  …occur in the Kaapvaal and Zimbabwe cratons and contain large deposits of gold and sulfide minerals. The volcanic suites are dominated by basaltic and komatiitic lavas, often interlayered with metasediments and generally referred to as greenstone belts. Those structures are often found together with layered gneisses, or they are intruded…
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Precambrian rocks

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  In Precambrian: Occurrence and distribution of Precambrian rocks
  and Labrador; the Kaapvaal and Zimbabwean cratons in southern Africa; the Dharwar craton in India; the Aldan and Anabar shields in Siberia in Russia; the Baltic Shield that includes much of Sweden, Finland, and the
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