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Jean-Paul Liégeois
Earth Sciences
Geodynamics and mineral resources
Geodynamics and mineral resources
Publication details
Deckart, K, Bertrand, H & Liégeois, J.P. 2005. ‘Geochemistry and Sr, Nd, Pb isotopic composition of the Central Atlantic Magmatic Province (CAMP) in Guyana and Guinea’. Lithos 82: 282-314. Amsterdam : Elsevier. DOI: 10.1016/j.lithos.2004.09.023. I.F. 3.303.
Article in a scientific Journal / Article in a Journal
The Central Atlantic Magmatic Province (CAMP) extends over more than 5000 km on both sides of the Atlantic Ocean. Its emplacement records a short period of time (200 ± 5 Ma) and is linked to the initial stage of continental breakup of Pangaea. Two areas on both sides of the Atlantic Ocean are studied herein, French Guyana/Surinam, South America and Guinea, West Africa. The results obtained from these two regions are contrasted and indicate a depleted mantle source close to PREMA-type for French Guyana/Surinam and a more enriched source for Guinea.
This geochemical study supports the prevalence in Guinea, as in the majority of CAMP, of a lithospheric mantle source, previously enriched during ancient subduction events, and preferentially reactivated in late Triassic times by edge-driven convection between cratonic and mobile belts domains. Higher contribution of a depleted asthenospheric source is required in Guyana, which may reflect the evolution of CAMP rifting towards the initiation of the central Atlantic oceanic crust.