Diagrams of lead isotope ratios for sulphides from Muping–Rushan gold belt. (a) ²⁰⁶Pb/²⁰⁴Pb vs. ²⁰⁷Pb/²⁰⁴Pb; (b) ²⁰⁶Pb/²⁰⁴Pb vs. ²⁰⁸Pb/²⁰⁴Pb; (c) ²⁰⁶Pb/²⁰⁴Pb vs. ²⁰⁸Pb/²⁰⁴Pb Pb isotope evolution diagram; (d) Δβ vs. Δγ genetic classification diagram. Boundaries in diagrams of (a), (b), (c) are after Zartman and Doe (1981). Boundaries in diagrams of (d) are after Zhu et al. (1998). Denggezhuang gold deposit lead isotope data from (Cui, 2012; Yang and Lv, 1996). Yinggezhuang gold deposit lead isotope data from (Zhou, 2010). Jinqingding gold deposit lead isotope data from (Chen, 2010; Li, 1992; Li, 2011; Yang, 2000). The Kunyushan granitic complex lead isotope data from (Hu, 2006; Wang, 1988; Xu, 1986; Yang and Lv, 1996). The Jiaodong group lead isotope data from (Chen, 1989; Wang, 1988). Δβ = 1000×β / (β_M-1), Δγ = 1000×γ / (γ_M-1). β, γ, β_M, γ_M are ²⁰⁷Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb for sample and mantle, respectively.