In recent years, there has been extensive research on porphyry copper deposits in the Duobaoshan ore- concentrated area, whereas studies on skarn- type deposits remain significantly insufficient. Regional metallogenic prediction for skarn- type copper deposits is also relatively weak, which has restricted breakthroughs in exploration for this type of deposit. This study aims to further clarify the metallogenic age of the San Kuanggou copper deposit and analyze the regional metallogenic prospects.Methods: This study, based on systematic field investigations, collected representative garnet and granodiorite samples. By applying LA- ICP- MS zircon and garnet U- Pb isotopic dating techniques combined with petrogeochemical analysis, the ages of rock formation and mineralization were precisely constrained. The geological setting and tectonic evolution related to mineralization were thoroughly discussed, and a scientific assessment of the metallogenic prospects for skarn- type copper deposits was conducted.Results: The results show that the granodiorite closely related to mineralization has an age of 170. 2±1. 0 Ma, and the andradite (calcic garnet) has an age of 168. 2±3. 7 Ma, indicating a time difference of approximately 2 Ma between rock formation and mineralization. Petrogeochemical analysis indicates that the mineralization- related granodiorite is depleted in high- field- strength elements such as Nb, Ta, Ti, and Hf, enriched in large- ion lithophile elements such as K, Rb, Sr, and P, with enrichment of light rare earth elements (LREE) and relative depletion of heavy rare earth elements (HREE).Conclusions:This study further constrains the copper mineralization to the Middle Jurassic, occurring within a tectonic setting related to plate subduction. The geochemical characteristics of high sodium, aluminum- rich and I- type granites imply that the tectonic setting and metallogenesis in this stage have a closer genetic linkage with the southeastward subduction of the Mongol—Okhotsk Ocean, which was probably overprinted by subduction of the Paleo- Pacific Plate. By integrating regional high- precision aeromagnetic data, geochemical anomaly distributions, geological background, and spatial distribution patterns of known deposits, three prospective skarn- type copper metallogenic areas have been successfully predicted within the Duobaoshan ore Concentration area.