Fluid inclusion microthermometry and C-H-O-He-Ar isotopes of the Zartorosht gold deposit, SE Iran: Implications for ore-fluid nature and metallogenesis

•Zartorosht is a typical orogenic gold deposit hosted in Sanandaj-Sirjan zone of SE Iran.•The ore-forming fluids in Zartorosht may have had a mixed metamorphic and mantle source.•Temperature-pressure-salinity diagram of Zartorosht favors a downward trend of temperature.•Crack-filling Au in pyrite reveals mineralization was associated with pressure drop.