Pyrites from the Meishan deposit have a wide range of d34S values, with the majority showing values between 2‰ and 10‰, and
a small number of pyrite samples yielding negative d34S values
between ca. 10‰ and 20‰ (Fig. 11a). This suggests that the sulfur in the Meishan deposits was derived from multiple sources,
possibly representing mixing of magmatic-derived sulfur with sulfur from the basement Huangmaqing Formation. The d13C values
obtained for mineralization-associated apatite suggests the likely
involvement of organic matter degradation during deposit formation (Yu et al., 2008), a process that is supported by negative d34S
values that reach 20‰ (Fig. 11a)