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Plotting the bulk isotope compositions composition of the two sections shows the vein to occupy a restricted range of $\delta$^{13}C and $\delta$^{18}O values between +1.5 to +3.7‰_{VPDB} and between -7 to -10‰_{VPDB} respectively, Figure 6(a). The plot has a degree of structure, but given the limited data set it is hard to determine the significance of this. For the most part $\delta$^{18}O and $\delta$^{13}C are decoupled with a horizontal band of data covering a range of $\delta$^{18}O between -8 and -10‰_{VPDB} and little or no variation in $\delta$^{13}C ($\approx$+3.5‰_{VPDB}). There is a subset of the data that shows a positive 1:1 correlation between $\delta$^{13}C and $\delta$^{18}O and an outlier of three points with relatively high $\delta$^{18}O values (-7 to -8‰_{VPDB}) and low $\delta$^{13}C values (1.5 to 2‰_{VPDB}).  \section{Discussion}  \subsection{Thermal constraints on fluid flux}