Longmu Co-Shuanghu plate suture and evolution records of paleo-Tethyan oceanic in Qiangtang area,Qinghai-Tibet plateau |
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Authors: | Li Cai Zhai Qingguo Dong Yongsheng Zeng Qinggao and Huang Xiaopeng |
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Institution: | (1) College of Earth Science, Jilin University, Changchun, 130061, China;(2) Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China;(3) Institute of Geology Survey of Tibet Autonomous Region, Lhasa, 850000, China |
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Abstract: | Three Late Triassic plate sutures, namely, the Longmu Co-Shuanghu suture, Kunlun-Qinling suture and Xijinwulan-Jinshajiang
suture, have been recognized on the Qinghai-Tibet plateau. Data show that the last two sutures have no essential elements
of the northern boundary of Gondwana. This paper briefly introduces the facts of the existence of the paleo-Tethys Ocean in
the Longmu Co-Shuanghu suture, i.e., the ages and natures of Early Paleozoic ophiolites, Permian ophiolites, Devonian-Permian
radiolarian cherts, accretionary relics of different natures, two types of tectonic mélange zones and ophiolites. The starting
time of paleo-Tethys Ocean in Qiangtang may be traced back to the Early Paleozoic and the records about the oceanic basin
evolution lasted from the Late Devonian to Late Triassic. It is thought that the Longmu Co-Shuanghu suture was the site for
the extinction of the paleo-Tethys Ocean on Qinghai-Tibet plateau and an important window for the reconstruction and inversion
of the early-stage formation and evolution of the Qinghai-Tibet plateau, as well as the northern boundary of Gondwana wich
the geoscience community has paid attention to in the past few decades.
Translated from Geological Bulletin of China, 2007, 26(1): 13–21 译自: 地质通报] |
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Keywords: | Longmu Co-Shuanghu plate suture paleo-Tethyan Ocean north boundary of Gondwanaland Qiangtang Qinghai-Tibet plateau |
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