New Idea on Presinian Strata in the Northern Margin of Qaidam Massif
xin hou-tian1; hao guo-jie1; wang hui-chu1; chen neng-song2; han ying-shan3; qi sheng-sheng3; (1. tianjin institute of geology and mineral resources; tianjin 300170; china geological university; wuhan 40037; qinghai lnstitute of geological survey; xining