18A review of the post-Cambrian igneous, structural and metamorphic history of

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provenance, and derivation from the Rio de la Plata craton is highly unlikely. considerations, previously zircon data, palaeocurrent and structural data, suggest that these rocks must have had an origin within Gondwana-forming blocks, for which the closest ide ntifiable somces are 'Brazilian' and 'African' (Namaqua Natal). Consequently, the model for the orogeny is that the Rio de la which was at the time attached to the large Amazonia craton and other smaller continental blocks, such as Arequipa Antofalla and Rio Protracted relative displacement of the RPC after the Orogeny 1ed to its fina1 !-'U.>lU'UH.

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