## 4 Fluid Inclusion Study
### Composition and Density of Fluid Inclusions
#### 4.4.1 Salinity  
Salinities in type 1 aqueous inclusions range from 0.18 to 17.00 wt.% equiv. NaCl (mean 9.2 \(\pm\) 4.5; 1\(\sigma\); n = 76; Table 2; Figure 8). Type 2 H\({}_{2}\)O-CO\({}_{2}\) inclusions contain 1.23-13.26 wt.% equiv. NaCl (mean 7.8 \(\pm\) 3.1; 1\(\sigma\); n = 14) (Table 2; Figure 8). The salinities of the type 3 daughter mineral-bearing inclusions are of 28.59-32.87 wt.% equiv. NaCl (mean 30.6 \(\pm\) 1.4; 1\(\sigma\); n = 6) (Table 2; Figure 8). Figure 8: Frequency histograms of salinity (wt.% equiv. NaCl) of different types of fluid inclusions trapped in quartz. Figure 7: Laser Raman spectra for fluid inclusions representative of the various types described from Xiawolong gold deposit. (**a,b**) Type 1 aqueous inclusions, (**c–e**) type 2 H\({}_{2}\)O–CO\({}_{2}\) inclusions, and (**f**) type 4 CO\({}_{2}\). \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \multirow{2}{*}{**Ore Style**} & \multirow{2}{*}{**Fluid**} & \multirow{2}{*}{**Eq.**} & \multirow{2}{*}{**v.t.\% NaCl**} & \multirow{2}{*}{**Bulk XM\({}_{2}\)O**} & \multirow{2}{*}{**Bulk XNaC1**} & \multirow{2}{*}{**Caroline XCO2**} & \multirow{2}{*}{**Carbonic XCO2**} & \multirow{2}{*}{**Carbonic XCH4**} & \multirow{2}{*}{**Bulk Density**} & \multirow{2}{*}{**Bulk Molar**} \\  & & & & & \(\pm\) CH4 & & & & & Volume \\ \hline \multirow{8}{*}{disseminated} & Type 1 aqueous & 0.35 to 17 & 1.05 to 2.14 & 0.0011 to 0.0594 & & & 0.467 to 0.952 & 20.6 to 39.6 \\  & Type 1 aqueous & (1.01 \(\pm\) 4, n = 4) & (1.23 \(\pm\) 0.22, & (0.0341 \(\pm\) 0.014, & / / / & / (0.831 \(\pm\) 0.118, & (239 \(\pm\) 4, / / / \\  & & \(n\) = 4)) & (n + 3)) & (n + 3)) & (n + 3)) \\  & Type 2 & 1.23 to 10.14 & 0.932 to 0.953 & 0.004 to 0.032 & 0.035 to 0.004 & 0.92 to 0.96 & 0.04 to 0.08 (0.06) & 0.954 to 1.053 & 19.2 to 19.8 \\  & Type 2 & (6.41 to 3.2, 0.941 \(\pm\) 0.007, & (0.020 \(\pm\) 0.010, & (0.038 \(\pm\) 0.003, & (0.94 \(\pm\) 0.02, & (0.10 \(\pm\) 0.038, & (19.5 \(\pm\) 0.2, / \\  & \(n\) = 7) & n = 7) & n = 7) & n = 7) & n = 7) & n = 7) & n = 7) \\  & Type 3 daughter & 286 to 32.9 & 1.12 to 1.15 & 0.11 to 0.13 & & & 0.866 to 0.986 & 25.91 to 2.6 \\  & mineral- & 0.95 to 1.8, & (1.13 \(\pm\) 0.02, & (0.12 \(\pm\) 0.01, & / / & / / & (0.83800103, & (25.96 \(\pm\) 0.05, \\  & bearing & n = 3) & n = 3) & n = 3) & n = 3) & n = 3) \\  & Type 4 CO2 & / & / & / & / & (0.96 to 0.99 & 0.01 to 0.04 & 0.450 to 0.758 & 57.7 to 106.5 \\  & Type 4 CO2 & / & / & / & / & (0.97 \(\pm\) 0.01, & (0.03 \(\pm\) 0.01, & (0.537 \(\pm\) 0.157, & (86.66 \(\pm\) 30, \\  & & n = 3)) & n = 3) & n = 3) & n = 3) & n = 3) \\ \hline \multirow{8}{*}{stockwork} & Type 1 aqueous & 0.18 to 16.35 & 1.02 to 1.82 & 0.0006 to 0.0575 & & & 0.949 to 0.98 & 20.5 to 0.33 \\  & Type 1 aqueous & (8.07 to 4.92, & (1.31 \(\pm\) 0.22, & (0.027 \(\pm\) 0.017, & / / & / (0.755 \(\pm\) 0.126, & (24.91 \(\pm\) 3.72, \\  & n = 3) & n = 3) & n = 3) & n = 3) & n = 3) \\  & & & & & & & n = 3) & n = 3) \\  & Type 2 & 5.7 to 13.26 & 0.93 to 0.059 & 0.018 to 0.044 & 0.031600.036 & 0.91 to 0.97 & 0.03 to 0.09 & 0.996 to 1.042 & 19.3 to 19.6 \\  & \(\rm H_{2}CO_{2}\) & (9.1 \(\pm\) 0.006, & (0.029 \(\pm\) 0.008, & (0.034 \(\pm\) 0.001, & (0.95 \(\pm\) 0.02, & (0.05 \(\pm\) 0.02, & (1.019 \(\pm\) 0.015, \\  & \(\rm H_{2}CO_{2}\) & (9.1 \(\pm\) 2, n = 7) & n = 7) & n = 7) & n = 7) & n = 7) & n = 7) \\  & Type 3 daughter & 29.3 to 31.5 & 1.13 to 1.16 & 0.113 to 0.124 & & & 0.865 to 0.887 & 25.8 to 26.1 \\  & mineral- & (30.3 \(\pm\) 0.9, & (1.14 \(\pm\) 0.01, & (0.018 \(\pm\) 0.005, & / / & / & (0.879 \(\pm\) 0.010, & (25.9 \(\pm\) 0.2, \\  & bearing & n = 3) & n = 3) & n = 3) & n = 3) & n = 3) & n = 3) \\  & Type 4 CO2 & / & / & / & (0.95 to 0.99 & 0.01 to 0.05 & 0.48 to 0.747 & 58.5 to 97.4 \\  & Type 4 CO2 & / & / & / & (0.98 \(\pm\) 0.02, & (0.02 \(\pm\) 0.02, & (0.629 \(\pm\) 0.136, & (72.7 \(\pm\) 17.5, \\  & & n = 3) & n = 3) & n = 3) & n = 3) \\ \hline \end{tabular}
\end{table} 
Table 2: Composition of fluid inclusions trapped in quartz at the Xiawolong gold deposit.