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Equifax has had a second security issue and that was enough for the IRS to temporarily suspend the company.Pressure, temperature, and timing of mineralization of the sedimentary rock hosted orogenic gold deposit at Klipwal, southeastern Kaapvaal Craton, South Africa.Gold mineralization in the Klipwal Shear Zone KSZ at the Klipwal Gold Mine is confined to laminated quartzcarbonate lodes, stringers, and associated alteration in sandstone and siltstone of the Delfkom Formation in the upper Mozaan Group of the Mesoarchaean Pongola Supergroup.The moderately dipping brittleductile KSZ strikes NS with an obliquereverse, sinistral sense of shear.The deformational events that are recognized include an early compressional phase that produced anastomosing shears defined by shear fabrics with numerous shear parallel laminated quartzcarbonate fault fill veins and, in places, extensional quartz vein stockworks, and a late brittle reactivation phase that produced fault breccias, displacing earlier extensional veins.Three closely spaced economic reefs lodes are developed the main R reef constitutes the KSZ, while the J and H reefs represent footwall splays.Alteration comprises chlorite, muscovite, epidote, feldspar, and carbonates along with pyrite, arsenopyrite, and chalcopyrite pyrrhotite.An inner alteration zone is dominated by laminated quartzcarbonate veins with alternating quartzcarbonate rich and muscovitechlorite rich laminae, whereas the proximal zone is characterized by alteration halos of K feldspar, albite, epidote, chlorite, and muscovite along with carbonates and associated quartz veins.Chlorite thermometry from the inner and proximal zones yielded temperatures of 2.C. Arsenopyrite compositions provide temperatures in the same range, 2.C. Fluid inclusion microthermometry and Raman spectrometry of quartz veins in the mineralized reefs reveal the presence of metamorphogenic aqueousgaseous fluid with an average salinity of 6.Na. Cl equiv. Fluid compositions and estimated pressuretemperature PT range 1.C are typical of orogenic gold deposits.Devolatilization during the regional facies metamorphism of the Pongola Supergroup is considered the likely fluid forming event with fluid flow focused into a compressional jog of the KSZ.Shear induced pressure fluctuations generated a phase separation of the initial aqueousgaseous fluid, producing a gaseous and low salinity aqueous fluid.This, together with fluidrock interaction, and a decrease in f.O2 lead to sulfide and gold precipitation at Klipwal.Re Os data from six sulfide samples constrain the age of sulfide precipitation and, by inference, gold mineralization, to 2.Ma, with an initial 1.Os1. 88. Os 0. MSWD 0.This age is distinctly younger than the post Pongola granites 2.Ma, ruling out the association of granite emplacement with mineralization.This would suggest that mineralization is linked to the regional D3 folding event which reactivated the KSZ after emplacement of the post Pongola granites and that final brittle, post mineralization reactivation is related to Karoo age faulting.Low initial Os values suggest that ore fluid interacted with mafic rocks, leaching non radiogenic Os, the likely source being the deeper seated Nsuze Group volcanics andor the greenstone belts that underlie the Pongola Supergroup.Keywords. Orogenic gold deposits Fluid inclusions Klipwal Kaapvaal Craton South Africa.
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