Geological setting of the Paleoproterozoic Rosebel gold district, Guiana Shield, Suriname

摘要: Abstract The Rosebel gold district is hosted in a Paleoproterozoic greenstone belt of the Guiana Shield and has many characteristics that enable classification ores as an orogenic deposit. Host rocks have undergone several phases deformation. However, deposition occurred late structural history belt, considered part regional metallogenic event with respect to geotectonic evolution Shield. Economic mineralization felsic mafic volcanic two sedimentary successions are differentiated into turbiditic arenitic depositional packages. detailed lithostratigraphic characterization geochemistry correlation local rock types Paramaka, Armina, formations respectively. comprises eight discrete deposits distributed along major structures. northernmost structure sub-vertical WNW–ESE shear zone preserves evidence dextral strike–slip followed by normal faulting. southern east–west reverse fault which mainly footwall. Gold associated quartz vein arrays developed pre-existing heterogeneities, such stratigraphic contacts fold hinges. Four main sets veins recognized district: veins, north–south tension stacks north-dipping anticline-hosted veins. Mineralized typically wallrock alteration assemblage comprising sericite, chlorite, carbonate, tourmaline, pyrite, pyrrhotite, plagioclase. presence structure, fault, consistent formation Riedel system during simple event. All cut deformed were deposited pull-apart basin, together their planar geometries, indicates late-Transamazonian orogen timing for mineralization. Extensive dating other revealed ages between 2.023 1.955 Ga mineralization, broadly coeval onset calc-alkaline volcanism plutonism (2.05–1.88 Ga) south