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\subsection{Fluid isotope compositions, sources and mixing processes}  In Figure 6(d) we have plotted T($\Delta$_{47}) versus the isotopic composition of the fluid (fluid $\delta$^{18}O) that is in equilibrium with the vein calcite. This composition is determined using the Kim and O'Neill (1998) calibration of the calcite-water fractionation factor as a function of temperature. The data defines a two component mixing line with a hot and cool end member. The hot end member has a temperature >100$^{\circ}$C and a $\delta$^{18}O value of approximately +5‰_{VSMOW} whilst the cool end member has a temperature of 30-50$^{\circ}$C 30-45$^{\circ}$C  and a $\delta$^{18}O value of -2 to -4‰_{VSMOW}. The low temperature end member has an isotopic composition that is typical of meteoric groundwaters being depleted in ^{18}O with respect to ocean water. We suggest that the range of minimum temperatures (30-50$^{\circ}$C) is characteristic of the depth of burial at the time of mineralization and that the near surface hydrogeology of the platform carbonates was dominated by meteoric recharge. With an elevated geothermal gradient of between 40 to 50$^{\circ}$C.km^{-1} this suggests that mineralization occurred at a depth of 0.8 to 1km. Such an estimate is in good agreement with previous studies (references).