Tectono-metamorphic framework of the Rosebel and Armina unit, French Guiana

Alexis Plunder (1) , Geoffrey Aertgeerts (1) , Harmony Suire (1) , Abdeltif Lahfid (1) , Arnauld Heuret (2, 3) , Alexandre Casanova (2)

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 UG - Université de Guyane
3 Géosciences Montpellier

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.

Keywords: petrological study; Guiana shield; Greenstone belt; mineral exploration

Domains: Petrography; Tectonics

Alexis Plunder, Geoffrey Aertgeerts, Harmony Suire, Abdeltif Lahfid, Arnauld Heuret, et al.. Tectono-metamorphic framework of the Rosebel and Armina unit, French Guiana. 12th Inter Guiana Geological Conference, Dec 2022, Georgetown, Guyana. ⟨hal-03788507⟩