Mesozoic igneous rocks developed in the Zhujiangkou basin on the northern margin of the South China Sea record the dynamic processes of subduction and closure of the PaleoPacific slab. We present a systematic study of the petrology, petrography, chronology and geochemistry of the late Jurassic volcanic rocks exposed by drilling in the Zhujiangkou basin, to explore their petrogenesis and dynamic setting. Petrology and geochemical analysis show that the studied volcanic rocks are composed of basalt, basalt andesite, andesite and trachyandesite. LAICPMS zircon UPb geochronology study shows that the crystallization age of basalt andesite is 154. 0±3. 2 Ma. The studied rocks have SiO2 content of 49.54%~58.22%, K2O content of 0. 71~3. 00%, MgO content of 5. 29%~11. 05%, and Mg# value of 52~66, belonging to the high potassium calcalkaline series. The rocks exhibit enrichment in light REE with the (La/Yb)N ratio of 5.00~6.93, and show slight negative Eu anomaly with δEu value of 0. 73~1. 04. These samples are significantly enriched in largeion lithophile elements such as Rb, Ba, Th and U, and depleted in high field strength elements such as Nb, Ta, Ti and P. Petrogenesis analysis shows that the Late Jurassic maficintermediate volcanic rocks mainly originated from the melting of the enriched lithospheric mantle metasomatized by subducted slabrelated fluids, and the parental magma experienced fractional crystallization of minerals such as pyroxene and amphibole. Combined with regional data, this paper proposes that the Zhujiangkou basin was in a continental marginal arc environment related to the PaleoPacific slab subducting beneath the South China block during the Late Jurassic.