Abstract: Erdaodianzi gold deposit located approximately 2 kilometers northwest of Erdaodianzi Town, Huadian City, Jilin Province, is a large gold deposit situated at the contact zone of Paleozoic schist, gneiss, and Mesozoic Early Jurassic granodiorite. It is controlled by a tectonic magmatic fluid mineralization system and NW-trending compressive and torsional faults. Our new research on mineral fluid inclusions, H-O-S-Pb isotopes, and mineralization ages has provided insights into its genesis and geological background. The main types of fluid inclusions are mainly gas-liquid two-phase and liquid phase inclusions, with uniform temperatures between 218.7 and 347.8 ℃, fluid salinities of 3.33% to 14.57%, densities of 0.69 to 0.89 g/cm3, and a mineralization depth of less than 1.4 km. The fluid inclusion δ¹⁸O_H2O values range from 5.23‰ to 9.50‰, δD values range from -83.8‰ to -111.1‰, and δ³⁴S values range from -8.25‰ to -2.00‰, with ratios of ²⁰⁶Pb/²⁰⁴Pb、²⁰⁷Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb varying from 16.721 0 to 18.489 8,15.340 0 to 15.623 0 and 36.488 0 to 38.373 0, respectively. These characteristics reveal a medium temperature hydrothermal deposit with ore-forming fluids sourced from magma, involving water-rock interactions with surrounding rocks and the addition of atmospheric water. The mainly ore-forming material is derived from magma mixed with stratigraphic materials. Additionally, single grain zircon LA-ICP-MS U-Pb ages of （(192.7 ± 1.6) Ma） from biotite granodiorite align with the regional gold mineralization era. Comprehensive analysis suggests that the deposit is a magmatic hydrothermal gold deposit related to plutonic magmatism, suitable for an active continental margin orogenic extension environment influenced by the subduction of the Peleo-Pacific plate.

Key words: deposit geology, fluid inclusion, H-O-S-Pb isotope, zircon U-Pb dating, metallogenic geological environment, Erdaodianzi gold deposit, magmatic hydrothermal gold deposit