Radiating 1.0 Ga mafic dyke swarms of eastern Brazil and western Africa: Evidence of post-assembly extension in the rodinia supercontinent?

dc.creatorCorrea-Gomes, LC
dc.creatorOliveira, EP
dc.date2000
dc.dateJUL
dc.date2014-12-02T16:30:00Z
dc.date2015-11-26T16:43:36Z
dc.date2014-12-02T16:30:00Z
dc.date2015-11-26T16:43:36Z
dc.date.accessioned2018-03-28T23:28:41Z
dc.date.available2018-03-28T23:28:41Z
dc.identifierGondwana Research. Elsevier Science Bv, v. 3, n. 3, n. 325, n. 332, 2000.
dc.identifier1342-937X
dc.identifierWOS:000088002900003
dc.identifier10.1016/S1342-937X(05)70291-4
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/58785
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/58785
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/58785
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1273647
dc.descriptionSeveral 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.
dc.description3
dc.description3
dc.description325
dc.description332
dc.languageen
dc.publisherElsevier Science Bv
dc.publisherAmsterdam
dc.publisherHolanda
dc.relationGondwana Research
dc.relationGondwana Res.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectmafic dykes
dc.subjectpalaeocontinental reconstruction
dc.subjectRodinia supercontinent
dc.subjectPan-african
dc.subjectCongo
dc.subjectDolerites
dc.subjectMargins
dc.titleRadiating 1.0 Ga mafic dyke swarms of eastern Brazil and western Africa: Evidence of post-assembly extension in the rodinia supercontinent?
dc.typeArtículos de revistas


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