Abstract:The Shibaogou deposit located in the Luanchuan ore concentration area, is a large-scale porphyry-skarn Mo(W) deposit discovered in recent years. However, the dating ofore-forming pluton is still controversial. Meanwhile, the studying of magmatic oxygen fugacity, the important physical and chemical parameters of porphyry deposit, is also not very satisfactory. In order to constrain the age of the Shibaogou pluton and the metallogenic significance of the magmatic oxygen fugacity, the zircon U-Pb dating and trace element composition were detected via LA-ICP-MS method, and the oxygen fugacity and temperature were also calculated. The results show that the ages of porphyritic biotite monzonitic granite, medium-fine grained biotite monzonitic granite, and quartz porphyry in the mine were (147.4 ± 0.8) Ma, (147.0 ± 1.0) Ma and (146.9 ± 1.1) Ma, respectively. The temperatures were 692 °C, 718 °C and 737 °C. The oxygen fugacity (log fO2) was -16.16, -14.40, and -12.77, with the relative oxygen fugacity (△FMQ) of 1.25, 3.35, and 3.56, respectively. These indicated that Shibaogou pluton had the characteristics of high temperature and oxygen fugacity, conducive to the formation of porphyry Mo deposits. With evolution of magma, the temperature and oxygen fugacity increased, thus quartz porphyry intruded in the late stage may be an important criteria in ore prospecting.