The Banmiaozi Gold Deposit，located within the Laoling Metallogenic Belt in southern Jilin Province， has long been controversial regarding its genesis，hindering a systematic understanding of regional metallogenesis.To clarify its mineralization mechanism，the granodiorite porphyry closely associated with mineralization were studied based on detailed field investigations.Petrological，petrogeochemical，and zircon U-Pb dating studies were systematically conducted.The results of Zircon U-Pb dating show a granodiorite porphyry formation age of 125.2 Ma±1.1 Ma（i.e.，the Early Cretaceous）. The granodiorite porphyry exhibits the following geochemical characteristics: high Si and rich Na（w（Na2O）/w（K2O）=1.17-1.33）and moderate Al and Mg; there is also significant enrichment in large‐ion lithophile elements（Rb，Ba，and Th）and depletion in high‐field‐strength elements（Nb，Ta，and Ti），without pronounced Eu anomaly（δEu=1.16-1.22）.Moreover，there are typical adakitic rock affinities: high Sr（w（Sr）=784.50×10−6-1 006.00× 10−6），high w（Sr）/w（Y）ratios（94.14-117.55），low Y（w（Y）=6.94×10−6-9.49 × 10−6），and low Yb（w（Yb）=0.66× 10−6-0.78×10−6）.Combined with regional magmatic activity and elevated contents of mantle‐compatible elements in granodiorite porphyry（w（Ni）=69.11×10−6-127.70×10−6 and w（Cr）=204.30×10−6-413.40×10−6） and high Mg# （58-61），it is believed that the granodiorite porphyry is formed in a regional extensional tectonic setting triggered by therollbackofthePaleo-PacificPlate，originatingfrom partialmeltingofdelaminatedlowercrust.Basedoncomprehensive deposit geology，it is concluded that the Banmiaozi Gold Deposit is an epithermal deposit formed during the Early Cretaceous and is genetically closely related to adakitic magmatism.