Late Paleozoic evolution of south branch of Central Asian Orogenic Belt: With reference to creation of the Middle-Late Permian residual marine basins bordering Mongolia and China
Wu Genyao
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029
Abstract The south branch of the Paleo-Asian Ocean,being a complicated archipelago,could be divided into the west,middle and east segments by the NNE-orientated transform faults. The oceanic crust created and subducted earlier in the west segment,and western Mongolia became a landmass in the Permian. Simultaneously,there developed the Zuunmod oceanic basin and several residual marine basins in central-eastern Mongolia and neighboring regions. The NEE- to WE-orientated oceanic basin,the NW-striking Adaatsag suture(shear zone)and the NNE-striking Erdenedalai trough made up a Permian three-armed structure. The oceanic realm of the middle segment could be divided into two sub-oceanic basins,distributing respectively in central Gobi and southern Gobi areas. The oceanic crust of the former subducted northwards. After the disappearance of the ocean,a residual marine basin with an age of Middle-Late Permian,named the Ondorsht basin,occurred in the former fore-arc region. The oceanic crust in southern Gobi area and western Inner Mongolia subducted southwards,accompanied with occurrence of an intra-oceanic arc(the Zoolen Arc)and a continent marginal arc(the Yagan-Suoguozhuo Arc). After the disappearance of the ocean,the residual marine basins formed in the former back-arc regions during the Middle Permian,and named the South Gobi and Guaizihu basins respectively. A similar tectono-palaeogeographic evolution during the Late Paleozoic occurred in the east segment(the east Mongolia and east Inner Mongolia),and the residual Middle Permian marine basins,named the Zhesi and Wujiatun basins,once linked up with the South Gobi basin. During the Late Permian,the marine South Gobi and Guaizihu basins continued to develop,where the thick coal-bearing strata or coarse clastic and volcanic rocks deposited respectively. Nowadays,the eastward stretch of South Gobi basin is intercepted by a magmatic arc. The Zhesi basin closed and the continental Linxi basin occurred during the Late Permian in eastern Inner Mongolia. Whereas in southwestern Mongolia,the marine invaded along two narrow swales near Chandmani during the late Late Permian,and deposited the middle-upper part of coal measures of the Tavan Dolgoi Formation.
About author: Wu Genyao,born in 1946,is a research professor and Ph.D. supervisor, and is mainly engaged in regional tectonics and orogeny-basin coupling analysis. E-mail: wugenyao@mail.iggcas.ac.cn
Cite this article:
Wu Genyao. Late Paleozoic evolution of south branch of Central Asian Orogenic Belt: With reference to creation of the Middle-Late Permian residual marine basins bordering Mongolia and China[J]. JOPC, 2014, 16(6): 907-925.
Wu Genyao. Late Paleozoic evolution of south branch of Central Asian Orogenic Belt: With reference to creation of the Middle-Late Permian residual marine basins bordering Mongolia and China[J]. JOPC, 2014, 16(6): 907-925.
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