U-Pb and Ar-40/Ar-39 geochronology of the Tongbai complex, central China Implications for Cretaceous exhumation and lateral extrusion of the Tongbai-Dabie HP/UHP terrane

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	U-Pb and Ar-40/Ar-39 geochronology of the Tongbai complex, central China Implications for Cretaceous exhumation and lateral extrusion of the Tongbai-Dabie HP/UHP terrane
	Cui, JJ (Cui, Jianjun); Liu, XC (Liu, Xiaochun); Dong, SW (Dong, Shuwen); Hu, JM (Hu, Jianmin)
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2012
卷号	47 期号:特刊 SI 页码:155-170
关键词	Tongbai complex U-Pb dating Ar-40/Ar-39 dating Cretaceous exhumation Lateral extrusion HP/UHP terrane
ISSN号	1367-9120
英文摘要	The Tongbai orogen in the middle of the Qinling-Tongbai-Dabie-Sulu orogenic belt is one of the most important portions for understanding the tectonic framework and evolution between the Sino-Korean and Yangtze cratons. In this paper, we report new U-Pb and Ar-40/Ar-39 age data from the Tongbai complex in order to constrain the extensional processes and late exhumation of HP/UHP terranes. Zircon U-Pb dating of different rock types in the Tongbai complex reveals the intrusion of volumino is granitic magmas at 139 +/- 2 Ma, contact metamorphism and migmatization of the Triassic metamorphic enclaves at 136 +/- 2 Ma, and syn-deformational emplacement of pegmatite veins at 131 +/- 1 Ma. Ar-40/Ar-39 thermochronology on hornblende, muscovite and biotite coupled with available structural data indicates two episodes of deformation (cooling) at ca.135-120 Ma and ca. 100-90 Ma. The predominant ductile shearing structures, including regional subhorizontal NWW-SEE stretching lineations in the whole Tongbai complex and sinistral and dextral shear senses along its northern and southern boundaries, were formed during the first deformational episode. Regionally, the Cretaceous magmatism, metamorphism, migmatization, deformation and cooling processes in the Tongbai complex are comparable with those in the Dabie-Sulu region, suggesting the evolution of the Tongbai-Dabie-Sulu orogen within the same extensional tectonic regime during this time. The Cretaceous extensional event is thought to have resulted in the lateral eastward extrusion of the Tongbai-Dabie terrene and exhumation and final exposure of the HP/UHP rocks from mid-upper crustal depths. (C) 2012 Elsevier Ltd. All rights reserved.
学科主题	地质年代学
WOS关键词	PRESSURE METAMORPHIC ROCKS ; EAST-CENTRAL CHINA ; TAN-LU FAULT ; CONTINENTAL-CRUST ; MINERAL INCLUSIONS ; TECTONIC EVOLUTION ; PETROLOGICAL INSIGHTS ; ISOTOPE GEOCHEMISTRY ; WESTERN DABIESHAN ; UHP METAMORPHISM
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000302756200012
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39872]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Cui, JJ ,Liu, XC ,Dong, SW ,et al. U-Pb and Ar-40/Ar-39 geochronology of the Tongbai complex, central China Implications for Cretaceous exhumation and lateral extrusion of the Tongbai-Dabie HP/UHP terrane[J]. JOURNAL OF ASIAN EARTH SCIENCES,2012,47(特刊 SI):155-170.
APA	Cui, JJ ,Liu, XC ,Dong, SW ,&Hu, JM .(2012).U-Pb and Ar-40/Ar-39 geochronology of the Tongbai complex, central China Implications for Cretaceous exhumation and lateral extrusion of the Tongbai-Dabie HP/UHP terrane.JOURNAL OF ASIAN EARTH SCIENCES,47(特刊 SI),155-170.
MLA	Cui, JJ ,et al."U-Pb and Ar-40/Ar-39 geochronology of the Tongbai complex, central China Implications for Cretaceous exhumation and lateral extrusion of the Tongbai-Dabie HP/UHP terrane".JOURNAL OF ASIAN EARTH SCIENCES 47.特刊 SI(2012):155-170.