| 西藏的构造演化历史及其特点 |
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| THE TECTONIC DEVELOPMENT OF XIZANG AND ITS CHARACTERISTICS |
| Crystalline basements of the Precambrian and glaciomarine sediments of the Gondwana facies of the Carboniferous-Permian system are widely spread in the Xizang Plateau, suggesting that the Xizang Block was part of Gondwanaland. In the Early Mesozoic or at the end of Paleozoic, the Xizang Block began to be separated from the Gondwanaland. Then the large scale seafloor spreading or rift extension occurred in the continental basement. In the Mid-Late Mesozoic, the trench-arc system of the Yarlung Zangbo River and the Xainza-Nagqu Rift system of the mantle type in northern Xizang were formed. Both the Yarlung Zangbo River subduction zone and Dongqian-Deng-qen zone came into being due to the subduction and collision of plates. During the collision, the first uplifting of the Xizang Plateau took place from the Late Cretaceous to the Eocene. It ended the transgression history of Xizang. At the same time, it caused the regression in an all-round way. The second rising took place from the Eocene to the Oligocene. And the thirth took place from the Pliocene to the Pleistocene. The last one was the largest among the three in scale. The embryo of the Xizang Plateau was formed. After that, the Xizang Plateau rose again at the end of Early and Middle Pleistocene to form the present pattern of the Xizang Plateau. |
| CHEN Guo-ming.1984.THE TECTONIC DEVELOPMENT OF XIZANG AND ITS CHARACTERISTICS[J].Acta Geoscientica Sinica,6(2):75-86. |
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