对青藏地区有重大影响的构造运动与岩浆响应事件

探讨了对青藏地区有重大影响的几次构造运动与岩浆响应事件的关系。结果表明 :青藏高原的形成发展过程中 ,随着构造活动由北向南的迁移 ,不同特提斯阶段的发育也呈现出一种自北而南的变化 ,岩浆响应事件也由超基性 /基性向酸性和碱性方向演化 ,最终在后特提斯阶段变为以钾玄岩系列为主的岩石组合特征。并且青藏地区在经历了特提斯阶段的几次构造运动及南北大陆对接以后的白垩纪末 -始新世陆 -陆碰撞、渐新世 -中新世高原雏形的形成和上新世以来高原快速隆升的陆内变形作用以后 ,就形成了今天这种“高、大、平”的独特地貌景观。

SOME TECTONIC MOTIONS AND MAGMATIC RESPONSE EVENTS OF IMPORTANT INFLUENCE ON QINGHAI-TIBET

This paper analyses the relationship of important tectonic motions to magmatic response events in Qinghai Tibet Area. The results show that with the migration of tectonic motion from north to south, and the development of different Tethys stages also show the same changes; meanwhile, the evolutions of magmatic response events are from ultrabasic/basic to acid, alkaline, and eventually, these events are characterized by the occurrence of high potassium igneous rocks series in opistho Tethys stage. After undergoing the tectonic motions and butt jointing of south north continent in Tethys stages, the collision between continent and continent in Upper Cretaceous period and Eocene epoch, the formation of plateau rudiment in Oligocene epoch and Miocene epoch, and the intra continental deformation of rapid uplifting since Pliocene epoch, the geomorphic landscape of "high massive flattish" Qinghai Tibet Area is formed.