1:250 000 Serxu Sheet in Sichuan, Qinghai and Xizang

The Jurassic strata are demonstrated and divided, from bottom to top, into the Lizhou and Ruihuanshan Formations. The radiolarias are found in the siliceous rocks from the Litang Ophiolite Group. Six magmatic belts are recognized, including the Yulong, Jomda, Jinshajiang, Xiangcheng, Litang and Yajiang magmatic belts. The magmatic rocks in the surveyed area consist roughly of the Permian-Late Triassic and Jurassic-Paleogene magmatic sequences. The examination of individual magmatic associations and their spatio-temporal evolution was also made during the geological survey. Tectonically, the Jinshajiang suture zone as the remains of the pre-existing Jinshajiang oceanic basin was initiated during the Early Carboniferous-Early Permian and terminated during the Late Triassic. The Garze-Litang suture zone is defined as the boundary fault between the Yushu-Zhongdian and Songpan-Garze continental masses. The tectonic framework consists of Songpan-Garze, Yushu-Zhongdian and Markam-Simao landmasses, including six second-order tectonic units:Yajiang Late Triassic residual basin, Garze-Litang intercontinental rift, Chomta-Xiangcheng volcanic arc, Jinshajiang oceanic basin, Jomda volcanic arc and Qamdo back-arc basin.