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Figure 6. (a) $\delta$^{13}C versus $\delta$^{18}O; (b) T($\Delta$_{47} T($\Delta$_{47})  versus $\delta$^{13}C; (c) T($\Delta$_{47}) versus $\delta$^{18}O. The dashed line represents the trend of temperature and isotopic composition for calcite precipitated from a 2 component mixed fluid (T_{A} = 100$^{\circ}$C, fluid A $\delta$^{18}O=4.85‰_{VSMOW}; T_{B} = 30$^{\circ}$C, fluid B$\delta$^{18}O=-4.13‰_{VSMOW}); (d)T($\Delta$_{47}) (d) T($\Delta$_{47})  versus fluid $\delta$^{18}O. An illustrative error ellipse (90\% confidence interval) corresponding to the highest temperature data points is included in the plot. The contours are isopleths of calcite $\delta$^{18}O values.