The Tugurige gold deposit is located in the western part of the Xing'an-Mongolia Orogenic Belt (XMOB). This paper describes the geochronologic and petrological-geochemical data of the intrusive rocks in the Tugurige gold deposit. The LA-ICP-MS U-Pb dating of zircons from syenogranite, granite, hornblendite and diorite in the Tugurige gold deposit yielded weighted mean ²⁰⁶Pb/²³⁸U ages of 264.5±1.4 Ma, 278.7±1.0 Ma, 280.6±1.3 Ma and 288.0±2.6 Ma respectively. The results show that the ages of gold mineralization (268~259 Ma) and syenogranite (276~265 Ma) are the same within error. Geological and geochronological evidence indicates that the syenogranite and gold mineralization have very close genetic relationships. The intrusive rocks in the Tugurige gold deposit are bimodal intrusive rocks, and belong to the high K calc-alkaline series. They are characterized by enrichment of large ion lithophile (Rb, Pb, K, Sr) and light rare earth elements (LREE) and depletion of high field strength elements (Nb, Ta, P, Ti). The intrusive rocks in the Tugurige gold deposit have some geochemical characteristics of the intrusive rocks in the subduction zone. This indicates that the source of these intrusive rocks was probably altered or affected by subduction events, but can not constrain their geological background. Combined with geological data available, the authors hold that the intrusions and gold mineralization in the Tugurige area were related to post-collisional extension of the Central Asian Orogenic Belt (CAOB).