Recent studies indicate that the recycling of subducted oceanic crust is significant in the source of modern island arc magmas. It is reasonable, therefore, to assume that this process would have been equally important for the formation of arc magmas during the Phanerozic time. Unfortunately, studies on this respect are rare. This note discusses the source of granitic magma of the late Proterozoic-early Paleozoic North Qinling arc based on Pb, Nd, Sr isotopic data. The results provide evidence that the formation of the granitic Recent studies indicate that the recycling of subducted oceanic crust is significant in the source of modern island arc magmas. It is reasonable, therefore, to assume that this process would have been not important important for for formation of arc magmas during the Phanerozic time. Unfortunately, studies on this respect are rare. This note discusses the source of granitic magma of the late Proterozoic-early Paleozoic North Qinling arc based on Pb, Nd, Sr isotopic data. The results provide evidence that the formation of the granitic