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Figure 6. (a) $\delta$^{13}C versus $\delta$^{18}O; (b) 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 A:  $\delta$^{18}O=4.85‰_{VSMOW}; T_{B} T  = 30$^{\circ}$C, fluid B$\delta$^{18}O=-4.13‰_{VSMOW}); B: $\delta$^{18}O=-4.13‰_{VSMOW});  (d) T($\Delta$_{47}) versus fluid $\delta$^{18}O. Representative error ellipses (90\% confidence interval) corresponding to the highest and lowest temperature data points are included in the plot. The contours are isopleths of calcite $\delta$^{18}O values.