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Geochronology of the transition of eclogite to amphibolite facies metamorphism in the North Qinling orogen of central China

文献类型：期刊论文

作者Cheng, Hao1; Zhang, Chao; Vervoort, Jeffrey D.2; Li, Xianhua3; Li, Qiuli3; Zheng, Shu4; Cao, Dadi
刊名LITHOS
出版日期2011-08-01
卷号125期号:3-4页码:969-983
关键词Eclogite Fluid Qinling Quartz-rich Vein Lu-hf U-pb
ISSN号0024-4937
DOI10.1016/j.lithos.2011.05.010
文献子类Article
英文摘要Quartz-rich veins, together with their host high-pressure (HP) to ultra-high-pressure (UHP) rocks, are ideal for deciphering the fluid-rock interaction history in subduction zones. Previous studies of samples from Dabie-Sulu have shown that most quartz-rich veins within UHP/HP eclogite were formed during the prograde or early exhumation stage of host rocks. In contrast, a combined study of petrology and U-Pb, Sm-Nd and Lu-lif geochronologies for a quartz-rich vein and its host retrogressed eclogite from North Qinling. which is associated with a granite intrusion and obliterated with amphibolite-facies overprint, reveals that the amphibolite-facies overprint is likely due to the late regional magmatism and the quartz-rich vein might derive from the nearby granite. A pool of U-Pb analyses of zircon grains from the retrogressed eclogite reveals zircons grew over an extended period of time but with two caveats at ca. 490 Ma and ca. 473 Ma. Analyses of zircon grains from the quartz vein yield a weighted mean Pb-207/Pb-206 ages of 428 +/- 5 Ma (1 sigma), which is indistinguishable from that of formation of the adjacent granite. Combined elemental zoning patterns in the garnet with the spherical geometry effect, the Lu-Hf age of 416 5 Ma (2 sigma) of the retrogressed eclogite is likely a mix age of eclogite-facies and amphibolite-facies metamorphism while the garnet-amphibole Sm-Nd age of 400 +/- 8 Ma (2 sigma) approximates amphibolite-facies retrogression metamorphism. The latter is consistent with the garnet-biotite Sm-Nd age of 393 +/- 4 Ma (2 sigma) of the adjacent granite, suggesting contact metamorphism. The >70 Myr gap between the eclogite-facies metamorphism and the amphibole-facies overprint and the consistency of the timing the amphibolite-facies overprint for the eclogite and the cooling of the magma intrusion in this area indicate that the eclogite-facies metamorphism and amphibolite-facies metamorphism might be distinct metamorphic events, and the latter might be trigged by the granite intrusion. (C) 2011 Elsevier B.V. All rights reserved.
WOS关键词ULTRAHIGH-PRESSURE ECLOGITE ; TRACE-ELEMENT COMPOSITION ; SM-ND GEOCHRONOLOGY ; U-PB ISOTOPE ; LU-HF ; QUARTZ-VEIN ; FLUID-FLOW ; RAYLEIGH FRACTIONATION ; TECTONIC EVOLUTION ; CONTINENTAL-CRUST
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000293932200008
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/132A11/73884]  
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. Geochronology of the transition of eclogite to amphibolite facies metamorphism in the North Qinling orogen of central China[J]. LITHOS,2011,125(3-4):969-983.
APA Cheng, Hao.,Zhang, Chao.,Vervoort, Jeffrey D..,Li, Xianhua.,Li, Qiuli.,...&Cao, Dadi.(2011).Geochronology of the transition of eclogite to amphibolite facies metamorphism in the North Qinling orogen of central China.LITHOS,125(3-4),969-983.
MLA Cheng, Hao,et al."Geochronology of the transition of eclogite to amphibolite facies metamorphism in the North Qinling orogen of central China".LITHOS 125.3-4(2011):969-983.

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来源：地质与地球物理研究所

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