The Stratigraphic Sequence and Geological Significance of New Zaqing Formation in Zaduo Area, South Qinghai

A suit of volcanostratigraphic stratum consisted of many meta lava and some volcanics rocks which were possessed of erupting characters of tholeiiti basalts formed in Qiangtang basin in the Ranzheyong ways of Zhaqing area in Zaduo country,Qinghai.The relationship between the stratigraphic bottom and early-middle Permian Kaixinling Formation Nuo Ri Ba Ga Ri Bao Zu and Jiu Shi Dao Ban groups is unconformity of dip,and the volcanostratigraphic was covered with the late Triassic Jieza formation Jipila formation.The rock types of it include celadon-ash purple olivine basalt,aciculate basalt,basalt aciculate andesite,rhyolite,middle-mafic volcanic breccia,breccialuff and a few rhyolite,purple red debris sandst one and thinconglo merate,the character is as same as low Ti basalt of Emei Mountain.They were possessed of the charact eristics of continental erupting-sediment,there is unique character in region comparison,in north Qiangtang area,and can compare with Emei Mountain basalt stratig raphic.In the area,there was mostly a suit coal frag mental Formation and continental volcanics was not found,so we established Zhaqing formation for research,its era was the late Permian-early Triassic.