Fluid Phases Contemporaneous with the Diagenesis of Sandstones, Tectonic Movements and Operation of the Nuclear Reactors of Oklo (Gabon Republic)

摘要

The joint study of fluid inclusions and the petrography of the FA sandstones at Oklo allows an evaluation of the conditions of temperature and pressure of the various diageneses. It also allows for establishing in time the formation and operation of the natural reactors with respect to geological events. The conditions of the siliceous diagenesis, such as those of the formation of the tectonic structure of Oklo at its beginning, are evaluated at about 240 exp 0 C and 1000 bars. The carbonation diagenesis, which is posterior to the operation of the natural reactors, probably occurred at about 180 exp 0 C and 800 bars. During the nuclear reaction, the density of the fluids and the pressure stresses (between 1000 and 800 bars) suggest that the aqueous solutions probably were brought to temperatures between 450 and 600 exp 0 C. (ERA citation 03:034549)