The Qinling orogenic belt is a composite continental collision orogenic belt, which records Neoproterozoic tectono- magmatic events. It is of great significance for understanding the convergence and collision process of the North and South Qinling terranes, and the assemblageof Rodinia supercontinent. Zircon geochronology, whole- rock majorand trace elements geochemistry have been carried out for the Doufujian tonalites in the east of the South Qinling. Analyzed zircons yielded weighted mean 206 Pb/ 238 U age of 860. 7±6. 0 Ma, indicating magma emplaced in Neoproterozoic. The rocks werecharacterized by high SiO 2 (62. 41%~68. 89%), Al 2O 3 (15. 33%~17. 33%), Na 2O (4. 23%~5. 80%), and Na 2O/K 2O ratio (1. 11~2. 41). They are enriched in rich Sr (＞400×10 -6 ), but low MgO (0. 55%~2. 08%), Y (7. 40×10 -6 ~18. 20×10 -6 ), Yb (0. 63×10 -6 ~1. 62×10 -6 ), with high Sr/Y ratio (31. 49~78. 22), they also significantly rich in light rare earth elements \[(La/Yb) N＞20\], but show weak Eu positive anomaly. They have typical characteristics of adakite rocks. Their high K 2O content (2. 00%~4. 31%), low MgO and high La/Yb ratio indicate that the rocks are typical calc- alkaline adakiterocks. Parental magmas were likely originated from partial melting of the thickened lower crust, and the crust thickness of the South Qinling terrane may be up to 65 km.Combined with the regional geological data, it is suggested that the Doufujian tonalites were formed in a continental collision setting resulting from the collision between the North and South Qinling terranes after the closure of the Songshugou oceanic basin, and were the magmatic response of the Rodinia supercontinent aggregation. The first identification of the early Neoproterozoic calc- alkaline adakite provides a strong evidence for the South and North Qinling collision event.