Fluid Pressure Deformations in the Paleoproterozoic Francevillian Uranium Deposits (SE Gabon)
| Affiliation auteurs | !!!! Error affiliation !!!! |
| Titre | Fluid Pressure Deformations in the Paleoproterozoic Francevillian Uranium Deposits (SE Gabon) |
| Type de publication | Conference Paper |
| Year of Publication | 2015 |
| Auteurs | Ndongo A, Guiraud M, Vennin E, Flotte N |
| Editor | Andre-Mayer AS, Cathelineau M, Muchez P, Pirard E, Sindern S |
| Conference Name | MINERAL RESOURCES IN A SUSTAINABLE WORLD, VOLS 1-5 |
| Publisher | CNRS; Univ Lorraine Nancy; Katholieke Universiteit Leuven; Univ Liege; RWTH Aachen Univ |
| Conference Location | 2 RUE DU DOYEN MARCEL ROUBAULT, TSA 70605, VANDOEUVRE-LES-NANCY, F-54518, FRANCE |
| ISBN Number | 978-2-85555-066-4 |
| Mots-clés | fluid pressure, Franceville basin, Hydraulic fracturing, permeability barriers, uranium deposits |
| Résumé | Uranium deposits in the Franceville Basin in Gabon (2.0 Ga.,) are generally located in the vicinity of faults zones, below the stratigraphic contact between FA sandstones and FB ampelites. Previous works have showed that the uranium mineralizations are related to petroleum traps. They insisted on the role of fluid pressure (hydraulic fractures and hydraulic breccias) and their capacity to trap high-grade uranium ore in the francevillian deposits. In this study, footwall anticlines are identified and associated with NW SE trending longitudinal normal faults (i.e. ore location). They are also associated with main (MPB) and secondary permeability barriers (SPB) in the vicinity of stratigraphic FA FB and FB2a-FB2b transitions, respectively. Related to the permeability barriers, synlithification and postlithification fluid pressure structures have been identified. We will discuss the impact of fluid pressure distribution and fluid migration on uranium deposits. |