Helium and argon isotope diagrams of fluid inclusions from the Muping–Rushan gold belt. (a) ⁴He vs. ³He diagram (modified after (Mamyrin and Tolstikhin, 1984)); (b) ⁴⁰Ar/³⁶Ar vs. R/Ra diagram (modified after (Burnard et al., 1999)); (c) ⁴⁰Ar*/⁴He vs. R/Ra diagram (modified after (Hu et al., 1997)); (d) Location of typical gold deposits. Denggezhuang gold deposit He-Ar isotope data from (Xue et al., 2013; Zhang et al., 2002). Yinggezhuang gold deposit He-Ar isotope data from (Zhou, 2010). Jinqingding gold deposit He-Ar isotope data from (Zhang et al., 2012). R is the ³He/⁴He ratio of sample; Ra is the ³He/⁴He ratio of atmosphere (Ra=1.399×10⁻⁶) (Mamyrin et al., 1970). The magmatic field is summarised by Goodwin et al. (2017). (d) Simple map of the Muping–Rushan gold belt showing deposit localities.