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原特提斯洋内存在塔里木、中祁连、柴达木、扬子、华夏、印支、兰坪-思茅等诸多陆块/微陆块,多数陆块之间在早古生代晚期发育有蛇绿岩带或高压-超高压带。原特提斯域形成于从Rodinia裂解到Pangea超大陆集结期间,存在复杂的洋-陆格局和聚散过程。原特提斯洋不同陆块/微陆块属性和关系及其拼合过程是恢复重建Pangea超大陆聚合前构造背景的关键,但对其认识迄今还存在争论。因此,本文采用综合对比方法,以期建立原特提斯洋陆块/微陆块的亲缘性和海-陆格局,厘定原特提斯微陆块拼合时序与方式。结果表明,早古生代早期除华北陆块不具有亲冈瓦纳大陆的特征外,扬子、华夏、塔里木、柴达木、阿拉善、北秦岭-中祁连-中阿尔金、欧龙布鲁克、北羌塘、南羌塘、拉萨、兰坪-思茅、印支等陆块/微陆块都具有亲冈瓦纳的特征。在450~400Ma左右这一系列陆块/微陆块都向南俯冲-增生,并逐步拼合于冈瓦纳大陆北缘东段,原特提斯洋关闭,并形成了原潘吉亚(Proto-Pangea)超大陆;原潘吉亚于380Ma以后裂离出塔里木-华北陆块和大华南陆块,分别出现勉略洋和古特提斯洋,直到240~220Ma逐步向北聚合,形成最终的劳亚古陆,此时才形成潘吉亚超大陆。
In the original Tethys Ocean, there are many continental blocks / micro-continental blocks in the Tarim, Central Qilian, Qaidam, Yangtze, Huaxia, Indo-China and Lanping-Simao regions. Most of the continental blocks developed in the early Paleozoic developed snake- Rock belt or high pressure - EHV belt. The original Tethyan domain was formed during the period from the collapse of Rodinia to the Pangea supercontinent, with complex ocean-continent pattern and dispersion process. The nature and relationship of different terrestrial blocks / micro-terraces in the original Tethys Ocean and their assemblage process are the keys to restoring and reconstructing the tectonic setting of the Pangea supercontinent. However, there is still controversy about its understanding so far. Therefore, this article uses a comprehensive comparison method, with a view to establish the original Tethys ocean block / micro-continental block affinity and sea-land pattern, determine the original Tethys micro land block combination timing and mode. The results show that in the early Paleozoic, in addition to the fact that the North China terrane does not have the pro-Gondwana features, the Yangtze, Huaxia, Tarim, Qaidam, Alashan, North Qinling-Qilian-Middle Altyn, The Qiangtang, Southern Qiangtang, Lhasa, Lanping-Simao, Indosinian and other continental blocks / micro-continental blocks have the characteristics of pro-Gondwana. At about 450-400Ma, the series of continental blocks / micro-continental blocks subducted southward and proliferated, and gradually converged to the eastern section of the northern margin of the Gondwanaland. The original Tethyan Ocean was closed and Proto-Pangea ). The original Pangiya fissured the Tarim-North China Block and the South China Continent after 380Ma. The Mianleyang Ocean and the Gout Tethys Ocean appeared respectively and gradually converged northward from 240-220 Ma to form the final Laura ancient Land, this time to form Pangea super continent.