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

作　　者：Tao Wang Ying Tong Wenjiao Xiao Lei Guo Brian FWindley Tatiana Donskaya Shan Li Narantsetseg Tserendash Jianjun Zhang 

机构地区：[1]Beijing SHRIMP Center,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China [2]Key Laboratory of Earth Probe and Geodynamics,Chinese Academy of Geological Sciences,Beijing 100037,China [3]Xinjiang Research Center for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China [4]School of Geography,Geology and the Environment,University of Leicester,Leicester LE17RH,UK [5]Institute of the Earth’s Crust,Siberian Branch,Russian Academy of Sciences,Irkutsk 664033,Russia [6]Institute of Geology,Mongolian Academy of Sciences,Ulaanbaatar 15160,Mongolia

出　　处：《National Science Review》2022年第5期163-174,共12页国家科学评论（英文版）

基　　金：supported by the National Natural Science Foundation of China(41888101,41830216 and 41972225);the National Key Technologies R&D Program of China(2017YFC0601305,2018YFE0204202 and 2018YFC0603702);the Geological Survey Program of China(DD20190685)。

摘　　要：Tracing the closure of oceans with irregular margins and the formation of an orocline are crucial for understanding plate reconstruction and continental assembly.The eastern Central Asian Orogenic Belt,where the Mongol-Okhotsk orocline is situated,is one of the world’s largest magmatic provinces.Using 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 suture-parallel.The 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 blocks.This 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 

分 类 号：P548[天文地球—构造地质学]