Pattern and kinematic polarity of late Mesozoic extension in continental NE Asia Perspectives from metamorphic core complexes

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	Pattern and kinematic polarity of late Mesozoic extension in continental NE Asia Perspectives from metamorphic core complexes
	Wang, T (Wang, Tao); Zheng, YD (Zheng, Yadong); Zhang, JJ (Zhang, Jinjiang); Zeng, LS (Zeng, Lingsen); Donskaya, T (Donskaya, Tatiana); Guo, L (Guo, Lei); Li, JB (Li, Jianbo)
刊名	TECTONICS
	2011
卷号	30 页码:-
ISSN号	0278-7407
英文摘要	Late Mesozoic extension in NE Asia resulted in the development of a large extensional province. Metamorphic core complexes (MCCs) are the major features in this province and have Ar-40/Ar-39 ages of 130-110 Ma for the mylonites and U-Pb zircon ages of 150-110 Ma for the integral granitic intrusions. Based on this and previous studies, this paper summarizes major characteristics of these MCCs and recognizes a regional kinematic shear sense. Most MCCs in the Transbaikalia region, Sino-Mongolia border tract, and the northwest-central portion of the North China craton (NCC) show a top-to-the-southeast (SE) shear, whereas those in the eastern and southern NCC locally underwent top-to-the-northwest (NW) shear. The three largest basins (Songliao, Huabei and Ordos) in North China are located in the transitional zone between domains of opposing shear sense. We interpret the extension in the Transbaikalia, Sino-Mongolia tract and northwestern part of the NCC to reflect late-orogenic collapse of thickened crust following Middle-Late Jurassic collision along the Okhotsk suture. The southeastward extension is probably controlled by crustal-scale top-to-the-SE tangential shear. The transition from contraction to extension is marked by detachment faults that nucleated as extensional crenulation cleavage (ecc, i.e., C') in sub-horizontal ductile shear zones late in orogenic crustal thickening. The combined effect of gravitational loading and thermal-uplifting is considered to be the origin of the late-or post-orogenic collapse. The top-to-the-NW extension in the NE of the NCC might reflect antithetic sub-extensional zones or Mesozoic back-arc extension as a far-field effect of Cretaceous Pacific plate subduction.
学科主题	构造地质学
WOS关键词	NORTH-CHINA-CRATON ; SINO-KOREAN CRATON ; CENOZOIC TECTONIC EVOLUTION ; COESITE-BEARING ECLOGITES ; MONGOL-OKHOTSK OCEAN ; GENERAL SHEAR ZONES ; ANGLE NORMAL FAULTS ; EAST GOBI BASIN ; U-PB AGE ; INNER-MONGOLIA
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000297063500001
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39382]
专题	中国地质调查局
作者单位	Russian Acad Sci, Inst Earths Crust, Siberian Branch, Irkutsk 664033, Russia
推荐引用方式 GB/T 7714	Wang, T ,Zheng, YD ,Zhang, JJ ,et al. Pattern and kinematic polarity of late Mesozoic extension in continental NE Asia Perspectives from metamorphic core complexes[J]. TECTONICS,2011,30:-.
APA	Wang, T .,Zheng, YD .,Zhang, JJ .,Zeng, LS .,Donskaya, T .,...&Li, JB .(2011).Pattern and kinematic polarity of late Mesozoic extension in continental NE Asia Perspectives from metamorphic core complexes.TECTONICS,30,-.
MLA	Wang, T ,et al."Pattern and kinematic polarity of late Mesozoic extension in continental NE Asia Perspectives from metamorphic core complexes".TECTONICS 30(2011):-.