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Testing final closure time of the Paleo-Asian Ocean along the solonker suture by a transition of compressional and extensional setting

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Geoscience Frontiers 2020年第6期11卷 1935-1951页

作者： Haidong Zhang Jianchao Liu Jinkun Yang Jiakun Ge Jinya Wang Zhen Li The School of Earth Science and Resources Chang’an UniversityXi’an 710054China Department of Geology Northwest UniversityXi’an 710069China Laboratory of Mineralization and Dynamics Chang’an UniversityXi’an 710054China Anhui Branch of China National Geological Exploration Center of Building Material Industry Hefei 230022China

The giant Central Asian Orogenic Belt is an extensive accretionary orogen,of which the solonker suture,as a major regional suture,coincides closely with an early Permian paleobiogeographical boundary.This suture is considered to mark the location of the final closure of the Paleo-Asian Ocean between the North China Craton and the Mongolian Terrane.Although the closure time of the Paleo-Asian Ocean along the solonker suture has generally been regarded as Late Permian-Early Triassic,uncertainty remains because of a lack of typical collisionrelated features(e.g.,high-grade regional metamorphism and well-developed fold-thrust structures)and a scarcity of outcrops.The present study reports Early Permian foliated gabbros and dikes(288-275 Ma)and Middle-Late Permian undeformed layered gabbros,strongly peraluminous granites,and I-type granites(265-254 Ma)in the Xinhure area along the northern margin of the North China Craton.The Early Permian foliated intrusions have a subduction-related geochemical signature and were derived from partial melting of lithospheric mantle modified by subduction-related melts or fluids at the active margin of the North China Craton.In contrast,the Late Permian undeformed layered gabbros and strongly peraluminous granites were derived from partial melting of lithospheric mantle and middle-upper crust,respectively,triggered by asthenospheric upwelling.Therefore,a transition from an end-compressional to an extensional environment according to a transition from collision termination to postcollision of the North China Craton and Mongolian Terrane may have occurred between 275 Ma and 262 Ma.This time span can be considered as the final closure time of the Paleo-Asian Ocean along the solonker suture.

关键词： Central Asian orogenic belt solonker suture Layered gabbro Strongly peraluminous granite Paleo-Asian ocean closure time

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Accretion leading to collision and the Permian solonker suture,Inner Mongolia,China:Termination of the central Asian orogenic belt

Accretion leading to collision and the Permian Solonker sutu...

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中国科学院地质与地球物理研究所2003学术年会

作者： Brian F.Windley Department of Geology University of Leicester

The solonker suture records the termination of the central Asian Orogenic Belt(CAOB).However, tectonic development of the solonker suture is poorly understood.We report new field data for the Ondor Sum mel ange in the... 详细信息

关键词： solonker suture accretion Permian Paleo-Asian ocean Inner Mongolia.

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