///The Lesser Qinling carbonatite is located at the southern margin of North China craton. The Sr, Nd isotopic characteristics are close to the EM1 mantle member [(⁸⁷Sr/⁸⁶Sr)i =0.70495～0.70552; εN_d =-10.1～4.6], but with low Sr and Nd compared to EM1. The Pb isotopic characteristics of the carbonate rocks are in the range of southern Qinling Mountains, completely different from the North China plate. This implies that the lower crust or mantle of the southern margin of the North China Craton has been mixed with the lower crust of South Qinling. So the carbonatites formed at the stage of extension after collision in the Qinling orogeric belt. This paper also argues that the Triassic granitoids formed under an extension background and were involved in mantle materials from Qinling Orogenic belt.