Fluid infiltration into retrograde granulites of the Southern Marginal Zone(Limpopo high grade terrain)is exemplified by hydration reactions.shear zone hosted metasomatism,and lode gold mineralisation.Hydration reactions include the breakdown of cordierite and orthopyroxene to gedrite kyanite,and anthophyllite,respectively.Metamorphic petrology,fluid inclusions,and field data indicate that a low H_2O-activity carbon-saturated CO_2-rich and a saline aqueous fluid infiltrated the Southern Marginal Zone during exhumation.The formation of anthophyllite after orthopyroxene eslablished a regional retrograde anthophyllite-in isograd and occurred at P-T conditions of- 6 kbar and 610 C,which fixes the minimum mole fraction of II.0 in the CO_2-rich fluid phase at- 0.1.The maximum H_2O mole fraction is hxed by the lower temperature limit(~800℃) for partial melting at ~0.3.C-O-H fluid calculations show that the CO_2-rich fluid had an oxygen fugacity that was 0.6 log10 units higher than that of the fayalite-magnetitequartz buffer and that the CO_2/(CO_2+CH_4) mole ratio of this fluid was 1.The presence of dominantly relatively low density CO_2-rich fluid inclusions in the hydrated granulites indicates that the fluid pressure was less than the lithostatic pressure.This can be explained by strike slip faulting and/or an increase of the rock permeability caused by hydration reactions. Fluid infiltration into retrograde granulites of the Southern Marginal Zone (Limpopo high grade terrain) is via hydration reactions. Where the zone hosts hosted metasomatism, and lode gold mineralization. Hydration reactions include the breakdown of cordierite and orthopyroxene to gedrite kyanite, and anthophyllite, respectively. Metamorphic petrology, fluid inclusions, and field data indicate that a low H 2 O-activity carbon-saturated CO 2 -rich and a saline aqueous fluid infiltrated the Southern Marginal Zone during exhumation. The formation of anthophyllite after orthopyroxene eslablished a regional retrograde anthophyllite-in isograd and Occurred at PT conditions of-6 kbar and 610 C, which fixes the minimum mole fraction of II.0 in the CO 2 -rich fluid phase at- 0.1. The maximum H 2 O mole fraction is hxed by the lower temperature limit (~800 ° C) for partial melting at ~ 0.3. COH fluid calculations show that the CO 2-rich fluid had an oxygen fugacity that was 0.6 log 10 units higher than that of t he fayalite-magnetitequartz buffer and that the CO_2 / (CO_2 + CH_4) mole ratio of this fluid was 1. The presence of dominantly relatively low density CO_2-rich fluid inclusions in the hydrated granulites that that fluid pressure was less than the lithostatic pressure .This can be explained by strike slip faulting and / or an increase of the rock permeability caused by hydration reactions.