By using a two-stage light gas gun, two experiments of shock recovery experiments with initial sample of Fe+(Mg, Fe)SiO3 (En) were conducted between 78 and 113 GPa shock pressure (the corresponding temperature is estimated as 3000~5000K). The recovered samples were analyzed by X-ray Diffraction (XRD).The XRD observation at the middle section of two recovered samples illustrates the new composition of recovered samples is (Mg, Fe)2SiO4.Comparing with the recovery experiments of MgO+SiO2 ,we can infer that iron and perovskite react to form SiO2 and (Mg, Fe)O. The experiments result indicates that reaction between liquid iron and (Mg, Fe)SiO3 perovskite may occur at the core-mantle boundary in geological history. The reaction creates a very heterogeneous zone at the base of the mantle. Si and O dissolved in liquid iron are rapidly dispersed by the flow of the liquid outer core.
Modeling shock recovery experiments of sandstone