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  2. 地质与地球物理研究所
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  4. 岩石圈演化国家重点实验室
Anatomy of zircon growth in high pressure granulites: SIMS U-Pb geochronology and Lu-Hf isotopes from the Jiaobei Terrane, eastern North China Craton

文献类型：期刊论文

作者Zhao, Lei1; Li, Tiesheng1; Peng, Peng1; Guo, Jinghui1; Wang, Wei1; Wang, Haozheng1; Santosh, M.2; Zhai, Mingguo1,3
刊名GONDWANA RESEARCH
出版日期2015-12-01
卷号28期号:4页码:1373-1390
关键词Zircon geochronology High pressure metamorphism Lu-Hf isotope system Jiaobei Terrane North China Craton
DOI10.1016/j.gr.2014.10.009
文献子类Article
英文摘要Granulite fades rocks that witnessed high pressure and high temperature metamorphism preserve important records of the growth and recrystallizaton of zircons during the multiple stages of tectonic evolution of orogenic belts developed in complex subduction-collision settings. Here we investigate zircons in the Paleoproterozoic high pressure (HP) granulites from Jiaobei Terrane in the eastern North China Craton that experienced a multistage metamorphic evolution. We present SIMS zircon U-Pb ages for zircons from garnet amphibolites, mafic granulites and pelitic granulites. Our data show four age peaks at 2.5 Ga, 1.92 Ga, 1.87-1.85 Ga and 1.83 Ga. Zircons belonging to the latter three age groups show similar characteristics of low Th and U contents, low Th/U ratios (<0.1), sector zoning or unzoned internal structures, corresponding to the features of zircon growth during metamorphism. Using zircon Lu-Hf isotopic compositions combined with a careful analysis of the morphology of the zircons, we evaluate the processes of solid-state recrystallization, intergranular melt growth, coupled dissolution-reprecipitation and subsolidus growth. Zircons formed through solid-state redystallization during peak metamorphic stage inherited the relatively high Lu-176/Hf-177 ratios and low Hf-176/Hf-177 ratios of zircons from the protoliths. The youngest U-Pb age of ca. 1899 Ma is interpreted as the maximum estimate of the time of peak metamorphism. Zircons formed through intergranular melt growth during low- to medium-pressure retrogression display homogeneous Lu-Hf isotope compositions, low 176Lu/177Hf and high 176Hf/177Hf ratios. The U-Pb age of 1870-1850 Ma yielded by zircons crystallized from intergranular melt is interpreted to represent the time of low- to medium-pressure granulite facies retrogression. Some zircon grains with prismatic morphology and low Lu-176/Hf-177 and Hf-176/Hf-177 ratios display heterogeneous Lu-Hf isotopic compositions, possibly related to coupled dissolution-reprecipitation. The U-Pb ages of these zircons are identical to those formed from intergranular melt and these two groups of zircons formed during the same metamorphic stage. Zircons formed through subsolidus growth show large variations in Lu-Hf isotopic compositions and their ca.1833 Ma age represents the timing of amphibolite facies retrogression. The HP granulite facies metamorphism in Jiaobei is thus constrained between 1870 and 1899 Ma, with low- to medium-pressure granulite facies retrogression at ca. 1850-1870 Ma followed by amphibolite fades retrogression at ca. 1833 Ma.
WOS关键词LIAO-JI BELT ; GRADE METAMORPHIC BASEMENT ; TRACE-ELEMENT GEOCHEMISTRY ; CONTINENTAL-CRUST ; T PATH ; TECTONIC IMPLICATIONS ; SHANDONG PENINSULA ; SANGGAN AREA ; FACIES METAMORPHISM ; PELITIC GRANULITE
WOS研究方向Geology
语种英语
WOS记录号WOS:000364266900008
资助机构973 program(2012CB416606) ; 973 program(2012CB416606) ; 973 program(2012CB416606) ; 973 program(2012CB416606) ; National Natural Science Foundation of China(41030316) ; National Natural Science Foundation of China(41030316) ; National Natural Science Foundation of China(41030316) ; National Natural Science Foundation of China(41030316) ; 973 program(2012CB416606) ; 973 program(2012CB416606) ; 973 program(2012CB416606) ; 973 program(2012CB416606) ; National Natural Science Foundation of China(41030316) ; National Natural Science Foundation of China(41030316) ; National Natural Science Foundation of China(41030316) ; National Natural Science Foundation of China(41030316)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62171]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Zhao, Lei,Li, Tiesheng,Peng, Peng,et al. Anatomy of zircon growth in high pressure granulites: SIMS U-Pb geochronology and Lu-Hf isotopes from the Jiaobei Terrane, eastern North China Craton[J]. GONDWANA RESEARCH,2015,28(4):1373-1390.
APA Zhao, Lei.,Li, Tiesheng.,Peng, Peng.,Guo, Jinghui.,Wang, Wei.,...&Zhai, Mingguo.(2015).Anatomy of zircon growth in high pressure granulites: SIMS U-Pb geochronology and Lu-Hf isotopes from the Jiaobei Terrane, eastern North China Craton.GONDWANA RESEARCH,28(4),1373-1390.
MLA Zhao, Lei,et al."Anatomy of zircon growth in high pressure granulites: SIMS U-Pb geochronology and Lu-Hf isotopes from the Jiaobei Terrane, eastern North China Craton".GONDWANA RESEARCH 28.4(2015):1373-1390.

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来源：地质与地球物理研究所

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