Abstract: The Baizhangzi Gold Deposit is a quartz vein-type gold deposit hosted in tensional structural fractures within granite. To clarify the relationship between intermediate-acidic magmatic rocks and mineralization in the area, a systematic study was conducted on the lithogeochemistry and zircon U-Pb geochronology of the ore-hosting Baizhangzi granite, the Hutoushi granite, and the Miaojingou syenite porphyry. U-Pb dating results show that the Baizhangzi granite formed in the Late Triassic (227.4 Ma±2.7 Ma), followed by the intrusion of the Hutoushi granite to its south (223.6 Ma±2.3 Ma) and the Miaojingou syenite porphyry to its southwest (221.3 Ma±2.4 Ma). Lithogeochemical characteristics indicate that these intermediate-acidic magmatic rocks share a common magmatic source. However, the Baizhangzi granite has been strongly affected by ore-forming hydrothermal fluids, exhibiting pronounced Th and U anomalies. This suggests that the Baizhangzi granite is the principal ore-hosting intrusion in the district and should be prioritized in future exploration efforts.