Triassic retrograded eclogites and Cretaceous gneissic granites in the Tongbai Complex, central China Implications for the architecture of the HP/UHP Tongbai-Dabie-Sulu collision zone

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	Triassic retrograded eclogites and Cretaceous gneissic granites in the Tongbai Complex, central China Implications for the architecture of the HP/UHP Tongbai-Dabie-Sulu collision zone
	Liu, XC (Liu, Xiaochun); Jahn, BM (Jahn, Bor-ming); Cui, JJ (Cui, Jianjun); Li, SZ (Li, Sanzhong); Wu, YB (Wu, Yuanbao); Li, XH (Li, Xian-hua)
刊名	LITHOS
	2010
卷号	119 期号:3-4 页码:211-237
关键词	Eclogite Granite U-Pb dating Triassic Cretaceous Diachronous Tongbai-Dabie-Sulu
ISSN号	0024-4937
英文摘要	The Permo-Triassic Qinling-Tongbai-Dabie-Sulu collision zone between the Sino-Korean and Yangtze cratons hosts a number of terranes some of them carry evidence for ultrahigh-pressure (UHP) metamorphism. Discovery of retrograded high-pressure (HP) eclogites in the Tongbai Complex, in the middle of the orogen, brings fresh information to correlate segments of the orogen and understand dynamics of the orogeny. The 20 km wide Tongbai Complex is underlying two HP eclogite bearing lithotectonic units (the northern and southern eclogite zones) in the Tongbaishan area. It consists of gneissic granites and subordinate metamorphic enclaves. Among them, retrograded eclogites carry garnet with a compositional profile indicating a three-stage metamorphic evolution, from epidote-amphibolite, through eclogite, to amphibolite facies conditions. A thermobarometric study yields estimates of 660-700 degrees C and 8.0-10.3 kbar for the amphibolite facies stage. U-Pb geochronology and trace element characterization of zircon produced two important results. First, the dominant gneissic granites are Early Cretaceous (ca. 140 Ma) and not Neoproterozoic as formerly reported. Second, metaigneous enclaves, i.e. retrograded eclogites, garnet amphibolites, and dioritic-trondhjemitic gneisses, formed between 933 and 742 Ma and were metamorphosed at 232-220 Ma. Metasedimentary enclaves contain detrital zircons yielding two age populations of 2960 and 1966 Ma. Consequently, the tectonometamorphic evolution of the Tongbai Complex is quite similar to that of the Northern Dabie Complex, but the Tongbai Complex is likely to be positioned at a higher crustal level in the orogenic edifice. Furthermore, the lower metamorphic P-T conditions in Tongbaishan relative to the Dabie-Sulu region are hypothesized to have resulted from a shallower subduction. The younger metamorphic age (232-220 Ma) for the Tongbai Complex with respect to the overlying eclogite zones (metamorphism at ca. 255 Ma and cooling at ca. 238 Ma) reflects diachronous subduction and exhumation for these two HP slices. A similar process occurred in the Dabie and Sulu terranes. (C) 2010 Elsevier B.V. All rights reserved.
学科主题	变质岩岩石学
WOS关键词	EAST-CENTRAL CHINA ; U-PB ZIRCON ; ULTRAHIGH-PRESSURE METAMORPHISM ; COESITE-BEARING ECLOGITES ; HF-ISOTOPE COMPOSITIONS ; HIGH-GRADE METAMORPHISM ; WESTERN YANGTZE BLOCK ; GA CONTINENTAL-CRUST ; SM-ND AGES ; TRACE-ELEMENT
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000283462000004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39214]
专题	中国地质调查局
作者单位	Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Liu, XC ,Jahn, BM ,Cui, JJ ,et al. Triassic retrograded eclogites and Cretaceous gneissic granites in the Tongbai Complex, central China Implications for the architecture of the HP/UHP Tongbai-Dabie-Sulu collision zone[J]. LITHOS,2010,119(3-4):211-237.
APA	Liu, XC ,Jahn, BM ,Cui, JJ ,Li, SZ ,Wu, YB ,&Li, XH .(2010).Triassic retrograded eclogites and Cretaceous gneissic granites in the Tongbai Complex, central China Implications for the architecture of the HP/UHP Tongbai-Dabie-Sulu collision zone.LITHOS,119(3-4),211-237.
MLA	Liu, XC ,et al."Triassic retrograded eclogites and Cretaceous gneissic granites in the Tongbai Complex, central China Implications for the architecture of the HP/UHP Tongbai-Dabie-Sulu collision zone".LITHOS 119.3-4(2010):211-237.