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青藏高原北缘发育两条不同类型、平行展布、时代相近的早古生代高压和超高压变质带,构成了大洋俯冲带和大陆俯冲带沿北西走向平行展布的构造格局.北部的北祁连高压蓝片岩-榴辉岩相变质带是典型的大洋型俯冲带,南部的柴北缘超高压榴辉岩相变质带是大陆深俯冲的产物.研究表明,这两条类型不同的变质带分别代表同一俯冲带体系大洋俯冲和大陆碰撞的不同结果,并反映了大洋冷俯冲和大陆深俯冲的不同折返轨迹和路径,记录了阿拉善-塔里木地块与祁连-柴达木地块之间在早古生代时期的聚合和大陆碰撞造山带的形成和垮塌过程.
Two different types of high-pressure and ultrahigh-pressure metamorphic belt with different types, parallel spreading and similar age similar to the age are developed in the northern margin of the Qinghai-Tibet Plateau, forming the structural pattern that the oceanic subduction zone and the continental subduction zone are distributed along the northwest direction in parallel. The high-pressure blue-schist-eclogite facies belt is a typical oceanic subduction zone, and the ultrahigh-pressure eclogite belt in the northern Qaidam basin is a product of deep subduction in the continental China.The study shows that these two types of metamorphic zones represent The same subduction zone oceanic subduction and continental collision different results, and reflects the oceanic cold subduction and the continental deep subduction of the different reentry trajectory and path, recorded the Alxa - Tarim block and the Qilian - Qaidam massif between The Early Paleozoic Agglomeration and Continental Collision orogeny Formation and Collapse Process.