Tectono-metamorphic framework of the Rosebel and Armina unit, French Guiana
Résumé
In French Guiana, gold mineralisations are well known. However, the geological history of the gold-bearing unit remains hill studied. We here present the first tectonometamorphic study including state of the art pressure temperature condition determination of the Armina and gold-bearing Rosebel unit of French Guiana. Our study point to two deformation phase at least that can be linked to the main (D2a) and late (D2b) Transamazonian events. Our petrological study point that the Rosebel unit suffered metamorphic condition at the greenschist to amphibolite facies transition favourable for gold deposit formation whereas the Armina unit clearly suffered regional amphibolite facies condition.
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