Abstract: Based on the data collected in the recent years by the scientific expedition in the Qinghai-Xizang region, the principal structural features of Himalayas and Qinghai-Xizang Plateau are discussed from viewpoint of plate tectonic theory.In the light of a lot of data, such as on the geological history, the sedimentary characteristics, the distribution of Gondwana sedimentary facies, ophiolite suite, melange and exotic blocks, the crustal deformation nature, the regularity of magmatic activity and paired metamorphic belt on both sides of Yarlung Zangbo River, this work deals with the pattern and nature of plate motion, makes a subdivision of Himalayan orogeny and gives a preliminary analysis of its character as well.A possible model on formation of Qinghai-Xizang Plateau by multi-underthrusting and multi-matching is presented and it is suggested that the Bangong Co-Dongqiao tectonic belt can probably serve as the northern boundary of Gondwana land. And we propose a new mechanism that the Yarlung Zangbo Jinag tectonic belt was opened in Mesozoic and closed in Early Tertiary.

摘要： 本文根据近年来对青藏高原广泛开展的考察所积累起来的实际材料,以板块构造观点,简要讨论了青藏高原主要构造特征。文章以地质历史、沉积特征、冈瓦纳相沉积、蛇绿岩套、混杂岩和外来岩块的分布、变形特征、岩浆活动的规律以及雅鲁藏布江两侧变质带的特点,论证了喜马拉雅地区板块活动的方式和特征,对喜马拉雅运动进行了分期并对各期运动的性质作了分析。文章提出了冈瓦纳大陆的北界可能是班公湖-东巧构造带以及雅鲁藏布江构造带在中生代拉开、早第三纪闭合机制的新设想。