| 板块剪式汇聚加地体拼贴——中特提斯消亡的新模式 |
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| 引用本文： | 雍永源,贾宝江.板块剪式汇聚加地体拼贴——中特提斯消亡的新模式[J].沉积与特提斯地质,2000,20(1):85-89. |
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| 作者姓名： | 雍永源 贾宝江 |
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| 作者单位： | 成都地质矿产研究所,四川,成都,610082 |
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| 摘 要： | 中特提斯是中生代中晚期存在于南、北大陆之间的海洋。该海洋在晚白垩世消亡后，遗留长千余公里的班公湖－怒江板块结合带。在大量研究成果中，对中特提斯如何消亡这一重大问题至今分歧甚大。不少研究者持洋壳俯冲消亡（东太平洋模式）观点，但在俯冲方向上却有向南或向北之别。笔者则认为中特提斯是一个具有众多互不相通、时代早晚不同的狭窄洋盆的特殊海洋，綦肖亡过程中根本未发生过大规模的洋壳俯冲，帮提出剪式闭合加地体逐次拼
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| 关 键 词： | 板块 剪式汇聚 地体拼贴 中特提斯消亡 |
| 收稿时间： | 1998/12/8 0:00:00 |
| 修稿时间： | 1998-12-08 |
Shear convergence of plates and suturing of terranes: a new model for the comsumption of the Meso-Tethys |
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| YONG Yong-yuan,JIA Bao-jiang.Shear convergence of plates and suturing of terranes: a new model for the comsumption of the Meso-Tethys[J].Sedimentary Geology and Tethyan Geology,2000,20(1):85-89. |
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| Authors: | YONG Yong-yuan JIA Bao-jiang |
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| Institution: | Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, China |
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| Abstract: | The Meso-Tethys was a sea lying between Laurasia and Gondwana during the Middle and Late Mesozoic. Following the termination of the sea during the Late Cretaceous, the Bangong-Nujiang suture zone with a length of more than 1000 km was left over. The argument about the extinction of the sea still remains current. Many researchers have insisted on the eastern Pacific model for a long time, i.e.they owed its extinction to the subduction of the oceanic crust. However, the authors have put forward in this paper a new model for the consumption of the Meso-Tethys due to the shear convergence of plates and suturing of terranes, and argued that the Meso-Tethys is an unusual sea in which the narrow basins are isolated and vary in ages. It can be deduced that no large-scale subduction of the oceanic crust occurred at that time. The consumption of the Meso-Tethys commenced during the late Early Jurassic, when the eastern part of the Gangdise-Nyainqentanglha plate began to be sutured together with the Qiangtang-Nujiang-Lancangjiang-Jinshajiang plate without subduction, while the middle and western parts of the Meso-Tethys were still open. Till the Middle and Late Jurassic, the rifting apart from the southern terranes and northward suturing of the tectonic terranes on the northern side of the middle and western parts of the Meso-Tethys onto the Qiangtang-Nujiang-Lancangjiang-Jinshajiang plate took place almost simultaneously. The entire processes came to an end, and the two plates cited above were gradually sutured together during the latest Early Cretaceous. At the same time, the bulk of the middle and western parts of the Meso-Tethys disappeared successively. And during the latest Cretaceous, the large-scale subduction of the Neo-Tethys forced the two plates to be further sutured together, resulting in the continent-continent collision. Finally the Meso-Tethys terminated in response to the intrabasinal convergence including folding and thrusting and collisional orogenesis of the oceanic and intermediate crust. |
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| Keywords: | plate shear convergence suturing of terranes consumption of the Meso Tethys |
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