西南三江特提斯研究进展与展望

Research progress and prospects of Tethys in Sanjiang orogenic belt,Southwest China.

西南三江(怒江、澜沧江、金沙江)造山带是连接青藏高原与东南亚的桥梁,是特提斯研究的关键场所。通过回顾近十年来西南三江特提斯研究在原特提斯、高压榴辉岩带、弧后盆地结合带等方面取得的重要进展,指出了甘孜-理塘古特提斯洋及义敦岛弧存在与否、潞西-瑞丽带超基性岩构造环境、昌宁-孟连带石炭纪—二叠纪玄武岩和碳酸盐组合的地质意义、原特提斯时空配置4个关键地质问题。在此基础上,进一步提出未来特提斯研究的3个重点方向:①进一步完善三江地区构造格架;②探索原特提斯与古特提斯转换过程;③开展古生物学、古地磁学、地质学、地球化学等多学科综合研究,由定性到半定量、定量研究特提斯动力学。

The Sanjiang(Nujiang River,Lancangjiang River and Jinshajiang River)orogenic belt in Southwest China,which connects the Qinghai-Tibet Plateau in the north and Southeast Asia in the south together,is the key place for the study of Tethys.Based on the review of the important progress made in the past ten years in the study of Tethys in the Sanjiang orogenic belt in the early Paleozoic Tethys,high-pressure metamorphic eclogite belt and back arc basin suture,four key geological problems to be solved were pointed out,including whether Ganzi-Litang Tethys ocean and Yidun island arc once existed or not,the tectonic environment of ultrabasic rocks in the Luxi-Ruili belt and geological significance of the Carboniferous-Permian assemblage of basalt,and carbonate in Changning-Menglian belt and space-time configuration of Proto-Tethys were summarized.On this basis,the following three key directions of Tethys research in the future are proposed,the further perfection of the structural framework in Sanjiang orogenic belt,exploration of the transformation process between the Proto-Tethys and the Paleo-Tethys,the multidisciplinary comprehensive research and simulation of paleontology,paleogematology,geology and geochemistry to create qualitative to semi-quantitative and quantitative research on Tethys dynamics.