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Timing of eclogite facies metamorphism in the North Qinling by U-Pb and Lu-Hf geochronology

文献类型：期刊论文

作者Cheng, Hao1; Zhang, Chao; Vervoort, Jeffrey D.2; Li, Xianhua3; Li, Qiuli3; Wu, Yuanbao4; Zheng, Shu4
刊名LITHOS
出版日期2012-04-01
卷号136页码:46-59
关键词Eclogite Geochronology Lu-Hf Qinling U-Pb
ISSN号0024-4937
DOI10.1016/j.lithos.2011.06.003
文献子类Article
英文摘要Although petrologic data from the North Qinling orogen in central China have provided essential information on the geodynamic history of the orogenic cycle, the timing of the continental collision between the North China block and the South China block in the North Qinling orogen remains essentially unconstrained. To refine existing geodynamic models, two eclogites from the North Qinling were dated by U-Pb and Lu-Hf geochronology. The upper limit of the pressure during the eclogite facies metamorphism was restricted within the quartz stability field at 2.6-2.8 GPa within a temperature range of 660-710 degrees C by combining conventional thermobarometry and pseudosection estimates. Mineral-whole rock dating for multigarnet-(omphacite) fractions from two localities yielded ages of 516.4 +/- 5.8 Ma (2 sigma) and 494.3 +/- 2.7 Ma (2 sigma) with corresponding weighted mean zircon Pb-206/U-238 ages of 507.0 +/- 8.7 Ma (2 sigma) and 490.0 +/- 4.1 (2 sigma) Ma, respectively. Garnet porphyroblasts from the two samples bore evidence of prograde elemental zonation, but the major portion of the garnet grains grew exclusively under eclogite facies conditions as indicated by the occurrence of omphacite inclusions from core to rim. Therefore, these Lu-Hf ages were interpreted to reflect high-pressure eclogite facies metamorphism. The difference between the two Lu-Hf ages likely represents the minimum duration of garnet growth and thus brackets the onset and the closure of the subduction. These results allow for more detailed insight into the subduction history of the North Qinling orogen. These new U-Pb and Lu-Hf ages mark the timing of the onset of the continental collision between the North China block and the South China block in the Qinling belt, suggesting that the entry of the leading edge of the South China block continent into the North China block trench occurred from ca. 516 Ma to 490 Ma in the North Qinling orogen. (C) 2011 Elsevier B.V. All rights reserved.
WOS关键词SM-ND GEOCHRONOLOGY ; TRACE-ELEMENT DISTRIBUTION ; SOUTH CHINA BLOCKS ; HIGH-PRESSURE ; DABIE OROGEN ; GARNET GROWTH ; WESTERN ALPS ; ISOTOPE SYSTEMATICS ; TECTONIC EVOLUTION ; OCEANIC SUBDUCTION
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000302517900004
出版者ELSEVIER SCIENCE BV
资助机构Chinese Ministry of Science and Technology(2009CB825006) ; Chinese Ministry of Science and Technology(2009CB825006) ; National Natural Science Foundation of China(41073001 ; National Natural Science Foundation of China(41073001 ; NSF(EAR-0609856 ; NSF(EAR-0609856 ; Shanghai Rising-Star Program(10QA1406800) ; Shanghai Rising-Star Program(10QA1406800) ; 40973005) ; 40973005) ; EAR-0711280) ; EAR-0711280) ; Chinese Ministry of Science and Technology(2009CB825006) ; Chinese Ministry of Science and Technology(2009CB825006) ; National Natural Science Foundation of China(41073001 ; National Natural Science Foundation of China(41073001 ; NSF(EAR-0609856 ; NSF(EAR-0609856 ; Shanghai Rising-Star Program(10QA1406800) ; Shanghai Rising-Star Program(10QA1406800) ; 40973005) ; 40973005) ; EAR-0711280) ; EAR-0711280) ; Chinese Ministry of Science and Technology(2009CB825006) ; Chinese Ministry of Science and Technology(2009CB825006) ; National Natural Science Foundation of China(41073001 ; National Natural Science Foundation of China(41073001 ; NSF(EAR-0609856 ; NSF(EAR-0609856 ; Shanghai Rising-Star Program(10QA1406800) ; Shanghai Rising-Star Program(10QA1406800) ; 40973005) ; 40973005) ; EAR-0711280) ; EAR-0711280) ; Chinese Ministry of Science and Technology(2009CB825006) ; Chinese Ministry of Science and Technology(2009CB825006) ; National Natural Science Foundation of China(41073001 ; National Natural Science Foundation of China(41073001 ; NSF(EAR-0609856 ; NSF(EAR-0609856 ; Shanghai Rising-Star Program(10QA1406800) ; Shanghai Rising-Star Program(10QA1406800) ; 40973005) ; 40973005) ; EAR-0711280) ; EAR-0711280)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84084]  
专题中国科学院地质与地球物理研究所
通讯作者Cheng, Hao
作者单位1.Tongji Univ, Sch Ocean & Earth Sci, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
2.Washington State Univ, Sch Earth & Environm Sci, Pullman, WA 99164 USA
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
推荐引用方式
GB/T 7714		 Cheng, Hao,Zhang, Chao,Vervoort, Jeffrey D.,et al. Timing of eclogite facies metamorphism in the North Qinling by U-Pb and Lu-Hf geochronology[J]. LITHOS,2012,136:46-59.
APA Cheng, Hao.,Zhang, Chao.,Vervoort, Jeffrey D..,Li, Xianhua.,Li, Qiuli.,...&Zheng, Shu.(2012).Timing of eclogite facies metamorphism in the North Qinling by U-Pb and Lu-Hf geochronology.LITHOS,136,46-59.
MLA Cheng, Hao,et al."Timing of eclogite facies metamorphism in the North Qinling by U-Pb and Lu-Hf geochronology".LITHOS 136(2012):46-59.

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