The Closed Time of Tectonic Evolution of Middle Bangong-Nujiang Suture

The ocean basins of Bangong-Nujiang belongs to middle Tethys,studies of Quehala and Emeng Foemation in Nima Area show that middle Tethys is a particular ocean,where there are a great variety of special narrow oceans with different time sands without connection each other,the classic theory is not suited to its evolution,information of Yicangma at Qiangtang Basin displays the sea water decreases from east to west,sediments in Cuole Basin and Jurassic biological reef in Anduo and Baqing Area,both are sediments in remainder of the ocean basins,all the evidences above indicate that the evolution of Bangong-Nujiang suture cohere in a way,which likes scissors,and closed time of the middle Bangong-Nujiang Suture is at middle Jurassic.