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From arc-continent collision to ocean closure: Lower Cretaceous Shamuluo Formation in the western segment of the Bangong-Nujiang suture zone, central Tibet

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Geoscience Frontiers 2021年第5期12卷 309-326页

作者： An-Bo Luo Jian-Jun Fan Bo-Chuan Zhang Jian-Zhen Zhang Hang Li Meng-Long Duan College of Earth Sciences Jilin UniversityChangchun 130061China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Natural ResourcesChangchun 130061China Hebei Institute of Regional Geological Survey Langfang 065000HebeiChina

One of most hotly debated topics concerning the Late Mesozoic evolution of Tethyan and the Tibetan Plateau is the timing of the closure of the Meso-Tethys ocean,which is represented by the Bangong-Nujiang suture *** Upper Jurassic-Lower Cretaceous Shamuluo Formation,which unconformably overlies the older Mugagangri Group accretionary complex,provides important information on the closure of the Meso-Tethys *** paper precisely confines the depositional age of the Shamuluo Formation in the western segment of the Bangong-Nujiang suture zone,extending it from the Late Jurassic to the *** with the results of previous studies,we suggest that the Shamuluo Formation in the Awengco-Baerqiong region mainly contains a bathyal Berriasian-Hauterivian subunit and a shallow-marine Albian *** analysis indicates that the Berriasian-Hauterivian subunit was mainly derived from the Jurassic southern Qiangtang magmatic arc,while the Albian subunit was derived from the coeval volcanic rocks and the Upper Carboniferous-Upper Permian strata in the southern Qiangtang ***,the two subunits of the Shamuluo Formation have significant distinct sedimentary facies and provenances,indicating that they were deposited in different tectonic *** on the regional geological data,we suggest that the bathyal Berriasian-Hauterivian subunit and the shallow-marine Albian subunit of the Shamuluo Formation should be interpreted as a record of the oceanic arc-continent collision and the Lhasa-Qiangtang soft-collision,***,the closure time of the Meso-Tethys ocean is at least limited to the Albian.

关键词： Tibetan Plateau Meso-Tethys ocean Shamuluo Formation ocean closure Albian

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Rollback,scissor-like closure of the Mongol-Okhotsk ocean and formation of an orocline:magmatic migration based on a large archive of age data

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National Science Review 2022年第5期9卷 167-178页

作者： Tao Wang Ying Tong Wenjiao Xiao Lei Guo Brian F.Windley Tatiana Donskaya Shan Li Narantsetseg Tserendash Jianjun Zhang Beijing SHRIMP Center Institute of Geology Chinese Academy of Geological Sciences Key Laboratory of Earth Probe and Geodynamics Chinese Academy of Geological Sciences Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and GeographyChinese Academy of Sciences School of Geography Geology and the EnvironmentUniversity of Leicester Institute of the Earth's Crust Siberian Branch Russian Academy of Sciences Institute of Geology Mongolian Academy of Sciences

Tracing the closure of oceans with irregular margins and the formation of an orocline are crucial for understanding plate reconstruction and continental *** eastern Central Asian Orogenic Belt,where the Mongol-Okhotsk orocline is situated,is one of the world’s largest magmatic *** a large data set of U-Pb zircon ages,we updated the timing of many published igneous rocks,which allowed us to recognize tightly ’folded’ linear Carboniferous-Jurassic magmatic belts that wrap around the Mongol-Okhotsk suture and their migrations both sutureward and *** new successive magmatic belts reveal a rollback,scissor-like(or zipper-like) closure of the Mongol-Okhotsk ocean that was fundamentally controlled by coeval subduction rollback and rotation of the Siberian and Mongolian-Erguna *** study also demonstrates the complex mechanisms and processes of the closure of an ocean with irregular margins and the formation of a consequent orocline.

关键词： magmatic migration ocean closure orocline Mongol-Okhotsk ocean

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