Abstract: The Baizhangzi Gold Deposit is a quartz vein⁃type gold deposit hosted in tensional structural fractureswithin granite. To clarify the relationship between intermediate-acidic magmatic rocks and mineralization in the area, asystematic study was conducted on the lithogeochemistry and zircon U-Pb geochronology of the ore⁃hosting Baizhangzigranite, the Hutoushi granite, and the Miaojingou syenite porphyry. U-Pb dating results show that the Baizhangzi graniteformed 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 characteristicsindicate that these intermediate-acidic magmatic rocks share a common magmatic source. However, the Baizhangzigranite has been strongly affected by ore⁃forming hydrothermal fluids, exhibiting pronounced Th and U anomalies. Thissuggests that the Baizhangzi granite is the principal ore⁃hosting intrusion in the district and should be prioritized infuture exploration efforts.