The northern Anhui section of the Xu- Su arcuate structural region is an important metal resource producing base in the southern margin of the North China Craton. The Yangqiaozi gold- copper deposit in the middle part of the northern contact zone of the Sanpu complex is the largest gold deposit in northern Anhui so far. This work focuses on the ore- bearing quartz monzodiorite and the non- mineralization quartz monzodiorite porphyrite in the Yangqiaozi mining area. The LA- ICP- MS zircon U- Pb weighted average ages of the two intrusive rocks are 128±1. 1 Ma and 119. 9±4. 3 Ma, respectively, both of which were formed during the tectonic and magmatic peak periods of the North China Craton in the early Early Cretaceous. Geochemical compositions show that the intrusive rocks in the Yangqiaozi deposit are characterized by high silicon, alkali, LREE, Sr, low Th, Yb content, and belong to the high- potassium calcium- alkaline meta- aluminum I type granite. High Sr/Y, low HREE and Y, and no obvious Eu anomalies which indicate that it is similar to the characteristics of adakites. The zircon εHf(t) of the quartz monzodiorite is -16. 3~-5. 3, and the second- stage model age (tDM2) is 2202~1515 Ma, which is consistent with the age range of the zircon core, indicating that the lower crust of the North China Craton is an important end member of the magma source. Moreover, large εHf(t) variation range indicates that the magma source is mixed with mantle- derived magma. The oblique subduction of the Paleo- Pacific Ocean in the Mesozoic led to delamination and partial melting of the lower crust in the North China Craton. The subduction of oceanic crust slabs disturbed the asthenosphere, caused partial melting of the lithospheric mantle,and produced mantle- derived magma. The interaction of themantle- derived magma and the lower crust formed the parental magma of the quartz monzodiorite and the quartz monzodiorite porphyrite. This genetic model is consistent with the high Mg# and La/Ta, low Th/Ce, Sr/Y and (La/Yb)N ratios of the intrusive rocks. The average crystallization temperature of the two kinds of rock zircons is 742℃ and 708℃, and the average oxygen fugacity ΔFMQ is +1. 79 and +1. 48. The relatively high oxygen fugacity may have been the key factor for the Au- Cu mineralization of the quartz monzodiorite.