caa a22 4500 44529938X CHVBK 20180317142552.0 cr unu---uuuuu 170323e20100101xx s 000 0 eng 10.1007/s11430-009-0177-x doi (NATIONALLICENCE)springer-10.1007/s11430-009-0177-x An alternative tectonic model for the Yarlung Zangbo suture zone [Elektronische Daten] [XiaoHan Liu, YiTai Ju, LiJie Wei, GuangWei Li] The new field investigations along the Yarlung Zangbo ophiolites zone show that these series underwent low green-schist metamorphism and were then fractured and occurred as slabs in tectonic melanges, without regional tectonic polarity. No large shear zone in north-south direction has been identified between ophiolite bodies and flysch layers on both side and a conformable contact relationship can be observed locally between them. A great mass of tectonic mélange has been substantiated as submarine olistolith bodies. The Mesozoic sedimentary facies and its evolution in both north and south of the ophiolite zone are corresponding in time. The ophiolite zone has often been divided into parallel branches, separated by narrow flysch slats. There is also a similarity of the Paleozoic and the basement of the High Himalaya, Lhasa and Qiangtang Terranes, and they are distinctly different from those of the Indian continent. The geologic information does not warrant a postulate that the Himalaya and Tibet were once separated by a great ocean; it is therefore consistent with an alternative tectonic model by back-arc basin collapse with its juvenile narrow oceanic crust. The real plate tectonic suture, the Neotethys might be covered under the Miocene Siwalik molasse in the southern slope of the High Himalaya range. Based on the new model, the Neotethyan ocean floor was subducted beneath the Asia since the Late Triassic. The outer continental margin of Eurasia was split from the Lhasa Terrane so that a back-arc basin came into existence. Hemi-pelagic and deep sea sediments were deposited before the Late Cretaceous flysch sedimentation, with the linear juvenile oceanic crust when back-arc volcanism occurred in the Gandese region. The Yarlung Zangbo back-arc basin was eventually eliminated when the High Himalayas were sutured onto Eurasia. The ocean floor lightly underthrusted to north and south sides, sediments of the basin were deformed as fold-thrusting. The Neotethys was eliminated during the Tertiary when India collided with Himalaya arc from the Oligocene. The crust of southern Tibet suffered penetrative shortening, the ophiolite zone became exposed during regional uplifting, and the South Tibet Detachment System, doming in southern Tibet and rifting in a north-south direction since the Middle Miocene Epoch. Science in China Press and Springer Berlin Heidelberg, 2009 Yarlung Zangbo Ophiolite Zone nationallicence plate boundary nationallicence continental marginal arc nationallicence relic back-arc basin nationallicence alternative tectonic model nationallicence Liu XiaoHan Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100085, Beijing, China aut Ju YiTai Mineral Resource Institute of China Metallurgical Geology Bureau, 100025, Beijing, China aut Wei LiJie Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100085, Beijing, China aut Li GuangWei Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100085, Beijing, China aut Science in China Series D: Earth Sciences SP Science in China Press 53/1(2010-01-01), 27-41 1674-7313 53:1<27 2010 53 11430 https://doi.org/10.1007/s11430-009-0177-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11430-009-0177-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liu XiaoHan Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100085, Beijing, China aut NATIONALLICENCE 700 1- Ju YiTai Mineral Resource Institute of China Metallurgical Geology Bureau, 100025, Beijing, China aut NATIONALLICENCE 700 1- Wei LiJie Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100085, Beijing, China aut NATIONALLICENCE 700 1- Li GuangWei Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100085, Beijing, China aut NATIONALLICENCE 773 0- Science in China Series D: Earth Sciences SP Science in China Press 53/1(2010-01-01), 27-41 1674-7313 53:1<27 2010 53 11430 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer