西藏拉萨盆地位于冈底斯构造带南东段, 地质环境特殊, 为高原地区普遍且典型的构造形态; 通过研究拉萨盆地构造发育及其演变特点, 将拉萨盆地早中侏罗世以来的构造演化分共为两期三个阶段; 盆地形成的大地构造背景决定了沉积盆地时空演化过程。通过调查分析研究区的层序地层特征, 根据其地层组合规律, 将拉萨盆地内沉积地层共分为五个沉积序列组合。拉萨盆地沉积序列建造反映了山弧的形成演化过程, 同时也表明该盆地具障壁海岸沉积环境。盆地内沉积地层时代局限于新特提斯洋壳聚敛阶段; 其演化过程为: 特提斯主域洋壳向北俯冲消减, 形成中生代陆缘火山弧 (叶巴弧) 。随着俯冲作用的继续, 叶巴岛弧火山岩抬升并局部暴露地表接受剥蚀。之后发生大规模海侵, 拉萨盆地相对开始下降并接受沉积; 晚白垩世-古新世早期, 俯冲转变为碰撞事件; 始新世早期, 新特提斯洋壳完全闭合, 盆地内沉积地层褶皱成山, 拉萨盆地完全关闭。

The Lhasa Basin is located in the southeast segment of the Gangdise Tectonic Belt, with a unique geological environment, being a typical and common tectonic morphology in the highland areas. By studying the development and evolution characteristics of the Lhasa Basin's tectonic structure, the tectonic evolution of the Lhasa Basin from the early to middle Jurassic onwards is divided into two phases and three stages. The tectonic background of the basin's formation determines the temporal and spatial evolution process of the sedimentary basin. Through investigation and analysis of the sequence stratigraphic characteristics of the study area, the sedimentary sequences in the Lhasa Basin are divided into five sequence combinations based on their lithological association rules. The sedimentary sequence architecture of the Lhasa Basin reflects the formation and evolution process of the orogenic arc and indicates that the basin has a barrier beach sedimentary environment. The sedimentary strata in the Lhasa Basin are limited in age to the stage of convergence of the Neo-Tethyan oceanic crust; its evolution process is as follows: the main domain of the Tethyan oceanic crust moves northward and subsides, forming a Mesozoic continental volcanic arc (Ye'ba arc) during the Tethyan main domain. As the subduction continues, the Ye'ba island arc volcanic rocks are uplifted and locally exposed to erosion. Then, a large-scale marine invasion occurs, and the Lhasa Basin begins to sink and accept sedimentation relatively. During the Late Cretaceous-Early Paleogene, the subduction transformed into a collision event; during the Early Eocene, the new Tethys oceanic crust completely closed, folding sedimentary layers into mountains within the basin, thus completely sealing the Lhasa Basin.