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Type: Artigo de periódico
Title: Radiating 1.0 Ga mafic dyke swarms of eastern Brazil and western Africa: Evidence of post-assembly extension in the rodinia supercontinent?
Author: Correa-Gomes, LC
Oliveira, EP
Abstract: Several mafic dyke swarms of similar composition and age (tholeiite- ca.1.0 Ga) occur on both sides of the Atlantic Ocean in eastern South America and western Africa. When assembled to their pre-drift position in the Mesozoic, the Brazilian coastal dyke province of Bahia, and the African dykes in Cameroun (Ebolowa suite) and Congo (Comba and Sembe-Ouesso provinces) define a giant radiating pattern (1200 km x 800 km) similar to other dyke swarms elsewhere associated with large-scale continental rifting. Magma flow indicators of the Brazilian dykes and branching propagation styles of their African counterparts indicate that the dyke conduits were fed with magmas diverging from a source beneath the long axis of the Meso-Neoproterozoic West-Congolian Basin in Africa. There, MORE-like metabasalts have been described in the La Bikossi Group of the Mayombian Supergroup. Whether the rifting event and intrusion of dyke swarms were triggered or not by a mantle plume beneath part of the Rodinia subcontinental lithosphere remain to be confirmed.
Subject: mafic dykes
palaeocontinental reconstruction
Rodinia supercontinent
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/S1342-937X(05)70291-4
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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