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Deep subduction of continental crust in accretionary orogen: Evidence from U-Pb dating on diamond-bearing zircons from the Qinling orogen, central China

文献类型：期刊论文

作者Wang, Hao1; Wu, Yuan-Bao1,2; Gao, Shan1; Zheng, Jian-Ping1; Liu, Qian1,4; Liu, Xiao-Chi1,3; Qin, Zheng-Wei1; Yang, Sai-Hong3; Gong, Hu-Jun2
刊名LITHOS
出版日期2014-03-01
卷号190页码:420-429
关键词Diamond Ultrahigh pressure metamorphism Zircon U-Pb dating Accretionary orogen Qinling orogen
ISSN号0024-4937
DOI10.1016/j.lithos.2013.12.021
文献子类Article
英文摘要Accretionary orogenic belts are considered the most important sites for the generation of continental crust. However, it is still not very clear whether in such settings the continental crust has been significantly transported back to the mantle accompanied with its lateral growth. Continental UHP rocks, the best indicators of the recycling of the continental crust, have rarely been discovered in accretionary orogenic belts, which hinder the exploration of this essential process. The possible occurrence of early Paleozoic UHP metamorphism in the Qinling orogen provides an excellent opportunity to address this question. This article reports an integrated study of U-Pb age, trace element and mineral inclusion of zircon from an amphibolite sample in the Qinling orogen. The zircon crystals show typical metamorphic growth zoning, low Th/U ratios, flat HREE patterns, and insignificant Eu anomalies. They give a weighted mean U-Pb age of 490.4 +/- 5.8 Ma Most importantly, an in situ diamond inclusion was identified from one of the zircon crystals. Therefore, the obtained 490.4 +/- 5.8 Ma age was taken as registering the peak UHP metamorphism. The discovery of in situ diamond inclusion provides important evidence for the UHP metamorphism of the Qinling orogen and indicates that the North Qinling microcontinent was subducted to mantle depths of >120 km when it collided with the Erlangping arc attached to the southern margin of the North China Block Combining with previous results, we suggested that the North Qinling UHP terrane underwent fast exhumation from >120 km to ca. 30 km within 10 Myr intervals. As a few examples of UHP metamorphism have been discovered in some accretionary orogens, more attention needs to be paid to the occurrence of continental UHP metamorphism during accretionary orogenic process. Furthermore, evident crustal growth has been documented in the North Qinling orogen during the early Paleozoic. It is inferred that the accretionary orogenic belts may play important roles in recycling of continental crust into the mantle besides generation of continental crust. 2014 Elsevier B.V. All rights reserved.
WOS关键词ULTRAHIGH-PRESSURE METAMORPHISM ; TI-IN-ZIRCON ; WESTERN DABIE MOUNTAINS ; HF-ISOTOPE COMPOSITIONS ; SOUTH URAL MOUNTAINS ; TECTONIC EVOLUTION ; TONGBAI OROGEN ; TRACE-ELEMENT ; PALEOZOIC METAMORPHISM ; CHEMICAL GEODYNAMICS
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000333782300026
出版者ELSEVIER SCIENCE BV
资助机构Chinese 973 project(2009CB825006) ; Chinese 973 project(2009CB825006) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) ; 1212011120162) ; 1212011120162) ; Chinese 973 project(2009CB825006) ; Chinese 973 project(2009CB825006) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) ; 1212011120162) ; 1212011120162) ; Chinese 973 project(2009CB825006) ; Chinese 973 project(2009CB825006) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) ; 1212011120162) ; 1212011120162) ; Chinese 973 project(2009CB825006) ; Chinese 973 project(2009CB825006) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) ; 1212011120162) ; 1212011120162)
源URL[http://ir.iggcas.ac.cn/handle/132A11/85024]  
专题中国科学院地质与地球物理研究所
通讯作者Wu, Yuan-Bao
作者单位1.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
2.NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Hebei Inst Geol Survey, Shijiazhuang 050081, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Hao,Wu, Yuan-Bao,Gao, Shan,et al. Deep subduction of continental crust in accretionary orogen: Evidence from U-Pb dating on diamond-bearing zircons from the Qinling orogen, central China[J]. LITHOS,2014,190:420-429.
APA Wang, Hao.,Wu, Yuan-Bao.,Gao, Shan.,Zheng, Jian-Ping.,Liu, Qian.,...&Gong, Hu-Jun.(2014).Deep subduction of continental crust in accretionary orogen: Evidence from U-Pb dating on diamond-bearing zircons from the Qinling orogen, central China.LITHOS,190,420-429.
MLA Wang, Hao,et al."Deep subduction of continental crust in accretionary orogen: Evidence from U-Pb dating on diamond-bearing zircons from the Qinling orogen, central China".LITHOS 190(2014):420-429.

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来源：地质与地球物理研究所

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