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    中国百强科技报刊

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    Volume 43 Issue 8
    Aug.  2018
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    Wang Baodi, Wang Liquan, Wang Dongbing, Yin Fuguang, He Juan, Peng Zhimin, Yan Guochuan, 2018. Tectonic Evolution of the Changning-Menglian Proto-Paleo Tethys Ocean in the Sanjiang Area, Southwestern China. Earth Science, 43(8): 2527-2550. doi: 10.3799/dqkx.2018.160
    Citation: Wang Baodi, Wang Liquan, Wang Dongbing, Yin Fuguang, He Juan, Peng Zhimin, Yan Guochuan, 2018. Tectonic Evolution of the Changning-Menglian Proto-Paleo Tethys Ocean in the Sanjiang Area, Southwestern China. Earth Science, 43(8): 2527-2550. doi: 10.3799/dqkx.2018.160

    Tectonic Evolution of the Changning-Menglian Proto-Paleo Tethys Ocean in the Sanjiang Area, Southwestern China

    doi: 10.3799/dqkx.2018.160
    • Received Date: 2018-04-16
    • Publish Date: 2018-08-15
    • The tectonic evolution of the Changning-Menglian Tethys, as well as the transformation from Proto-Tethys to Paleo-Tethys, is one of hottest research topics concerning the geology of Qinghai-Tibetan Plateau and adjacent regions. Based on the recent geological findings and our new data, we summarized the geological features of the tectonic units from the Sanjiang orogenic system. Then we investigated the evolution history of the Changning-Menglian Tethys during the Early Paleozoic to Late Paleozoic. In view of the spatio-temporal structure of the different tectonic units, and the associated magmatism, sedimentary and metamorphic records. It is suggested in this study that (1) both crustal remnants of Proto-and Paleo-Tethys retain in the Changning-Menglian suture zone, (2) a magmatic arc belt developed from Lincang to Menghai in the Early Paleozoic, (3) the 'Lancang rock Group' was not the basement rock series, but Early Paleozoic tectonic-accretionary complexes formed by the eastward subduction of the Changning-Menglian Tethys Ocean, (4) the eclogite belt in western Yunnan might be the production of rapid exhumation after the deep subduction process of the accretionary complex during the arc-continent collision process. All new lines of evidence suggest that the Changning-Menglian Tethys probably was a continuous ocean from Early Paleozoic to Late Paleozoic. Combined the new findings with the regional geological data, the preliminary temporal-spatial framework and evolution process of the Sanjiang Tethys orogenic system are established, which mainly includes the following four stages:(1) Longmucuo-Shuanghu-Changning-Menglian proto-Tethys seafloor spreading in the Early Paleozoic, (2) the Tethys subduction and formation of the island arc belt from middle-late Early Paleozoic to Late Paleozoic, (3) the convergence and main collision processes from the end of Late Permian to Early Triassic, and (4) the late-collision orogeny and basin-mountain transition in the Late Triassic.

       

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