Located on the Shangdan tectonic zone, the Danfeng Group complex in the East Qin- ling mountains was on whole formed in Newproterozoic (1 000~800Ma). Petrogeochemical characterisitics of metabasic volcanic rocks within the complex of this group show that, instead of being ophiolite, they are island_arc type volcanic rocks formed in an active epicontinental paleoisland-arc tectonic environment under the plate tectonic system of Newproterozoic main orogenic epoch in Qinling orogenic belt.