Genesis of the Zhijiadi Ag-Pb-Zn Deposit, Central North China Craton: Constraints from Fluid Inclusions and Stable Isotope Data

Figure 15

versus pH isothermal diagram showing stability relationships in the system Fe-O-S for early and main stage (A) and late stage (B) of the paragenesis (modified from [38]). Given Fe-O-S mineral boundaries at moles/kg H₂O, °C, and condition, thinner red lines represent the stability field boundaries for pyrite, pyrrhotite, magnetite, and hematite with the following reasons: (1) the sulfur isotopic equilibrium temperatures are estimated to be 237–267°C; (2) previous study shows that pH value of the ore-forming fluid is near-neutral pH [19]; (3) the sericitization occurs in the Zhijiadi deposit. Kaol, kaolinite; Ms, muscovite; K-feld, K-feldspar.