气候变化领域集成服务门户(CCPortal): Inhomogeneous thinning of a cratonic lithospheric keel by tectonic extension: The Early Cretaceous Jiaodong Peninsula–Liaodong Peninsula extensional provinces, eastern North China craton

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DOI	10.1130/B35470.1
	Inhomogeneous thinning of a cratonic lithospheric keel by tectonic extension: The Early Cretaceous Jiaodong Peninsula–Liaodong Peninsula extensional provinces, eastern North China craton
	Liu J.; Ji M.; Ni J.; Shen L.; Zheng Y.; Chen X.; Craddock J.P.
发表日期	2020
ISSN	167606
起始页码	159
结束页码	176
卷号	133 期号:12
英文摘要	The mechanisms of lithospheric thinning and craton destruction have been hotly debated in the last decades. The Early Cretaceous Jiaodong and Liaodong extensional provinces (JEP and LEP, respectively) of the eastern North China craton are typical areas where the cratonic Archean lithospher has been intensely extended and thinned. Various extensional structures, e.g., metamorphic core complexes (MCCs), low-angle detachment faults, and extensional basins, characterize the Early Cretaceous crustal deformation of the two provinces. However, profound differences exist in structural development and related magmatic activities between the two provinces. Distributed small-scale extensional basins were formed in association with exhumation of the Liaonan and Wanfu MCCs in the LEP, whereas the major Jiaolai Basin was developed coevally with exhumation of the Wulian, Queshan, and Linglong MCCs in the JEP. Sr-Nd isotope compositions of volcanic rocks from the basins of the two provinces are compatible with syntectonic magmatic activities of evolving magma sources in the LEP, but multiple and hybrid magma sources in the JEP. It is shown, from variations in structural styles, plutonic and volcanic activities, and thermal evolution of the two extensional provinces, that two stages (ca. 135120 Ma and 120–100 Ma) of tectonic extension affectedthe JEP and LEP in the Early Cretaceous. We demonstrate that regional tectonic extension (parallel extension tectonics, or PET) is responsible for the formation of major exten ional structures and the occurrence of the magmatic associations. Progressive wide rifting by coupled crust-mantle de achment faulting of a hot LEP lithosphere was accompanied by evolving magma sources from dominant ancient crust and enriched mantle to juvenile crust. Two stages of narrow rifting of a cold JEP lithosphere led to early crustal detachment faulting transitioning to late crust-mantle faulting, which resulted in intense magmatic activity from hybrid to multiple magma sources. These processes contributed to destruction of the craton, with thinning of its lithospheric keel and local transformation of the nature of the lithospheric mantle. It is expected that such a model is also applicable to interpretation of tectonic extension of contiguous areas of the North China craton and the remobilization of other cratons. © 2020 Geological Society of America
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184773
作者单位	State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China; CNOOC Research Institute, Beijing, 100027, China; College of Earth Sciences and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; Development and Research Center, China Geological Survey, Beijing, 100037, China; Geology Department, Macalester College, 1600 Grand Avenue, Saint Paul, Minnesota, 55105, United States
推荐引用方式 GB/T 7714	Liu J.,Ji M.,Ni J.,等. Inhomogeneous thinning of a cratonic lithospheric keel by tectonic extension: The Early Cretaceous Jiaodong Peninsula–Liaodong Peninsula extensional provinces, eastern North China craton[J],2020,133(12).
APA	Liu J..,Ji M..,Ni J..,Shen L..,Zheng Y..,...&Craddock J.P..(2020).Inhomogeneous thinning of a cratonic lithospheric keel by tectonic extension: The Early Cretaceous Jiaodong Peninsula–Liaodong Peninsula extensional provinces, eastern North China craton.Bulletin of the Geological Society of America,133(12).
MLA	Liu J.,et al."Inhomogeneous thinning of a cratonic lithospheric keel by tectonic extension: The Early Cretaceous Jiaodong Peninsula–Liaodong Peninsula extensional provinces, eastern North China craton".Bulletin of the Geological Society of America 133.12(2020).