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Metamorphic Evolution and Zircon U-Pb Ages of the Nanshankou Mafic High Pressure Granulites from the jiaobei terrane, North China Craton

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Journal of Earth Science 2018年第5期29卷 1219-1235页

作者： Shuang Chen Xu-Ping Li Fanmei Kong Qingda Feng Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals Shandong University of Science and Technology

Petrological analysis and LA-ICP-MS zircon U-Pb dating were conducted on high- pressure marie granulites, which occured as xenolith within TTG gneisses, from the Nanshankou Village of the jiaobei terrane, Shandong Peninsula in the north-eastern part of the North China Craton （NCC）. The mafic HP grannlite is composed of garnet, clinopyroxene, orthopyroxene, amphibole and symplectitic clinopyroxene, orthopyroxene, plagioclase, ilmente and magnetite which were formed after the decomposition of porphyroblastic garnet and clinopyroxene. Four stages of metamorphic mineral assemblages for the mafic HP granulites were constrained by detail petrological and mineralogical in- vestigations. The early prograde assemblage is represented by the mineral inclusions within garnet and clinopyroxene porphyroblasts （Opx1＋Pl1＋Qtz1）, recording the metamorphic conditions at -754-757 ℃, 0.63-0.71 GPa; peak metamorphic conditions were determined at -874-891 ℃, 1.32-1.35 GPa with the mineral assemblage of Grt2＋Cpx2＋Amp2＋Pl2＋Qtz2. Retrograde minerals derived from symplectitic assemblage Opx3＋Cpx3＋Amp3＋Pl3＋Qtz3＋Ilm3±Mag3 were formed at 693-796℃, 0.60-0.84 GPa. A final greensehist to sub-greenschist facies event was recorded by the exsolution of actinolite and albite within a retrograded clinopyroxene, as well as the occurrence of prehnite, chlorite and calcite minerals. Accordingly, a clockwise P-T path was concluded on the basis of the different stages of mineral asseblage. Cathodoluminescence imaging, trace element and U-Pb dating of zircons from the mafic HP granulites recorded similar charactistics for three episodes of Paleo-Meso Proterozoic metamorphic events. These are the metamorphic events preserved in mafic and pelitic granulites in the Jiao-Liao-Ji belt （JLJB） with 207 pb/206pb ages of 2.0-1.9 Ga for peak metamorphism and of 1.86-1.84 Ga for decomposing process, followed by a retrograde amphibolite facies metamorphic event related to the post-orogenic extension at the age of 1.76-1.

关键词： metamorphism zircon U-Pb age mafic HP granulite jiaobei terrane North China Craton.

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Anatomy of zircon growth in high pressure granulites:SIMS U–Pb geochronology and Lu–Hf isotopes from the jiaobei terrane,eastern North China Craton

Anatomy of zircon growth in high pressure granulites:SIMS U...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Lei Zhao Tiesheng Li Peng Peng Jinghui Guo Wei Wang Haozheng Wang M.Santosh Mingguo Zhai State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Science School of Earth Sciences and Resources China University of Geosciences Beijing Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences

Granulite facies 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 *** we investigate zircons in the Paleoproterozoic high pressure(HP)granulites from jiaobei terrane in the eastern North China Craton that experienced a multistage metamorphic *** present SIMS zircon U–Pb ages for zircons from garnet amphibolites,mafic granulites and pelitic *** data show four age peaks at 2.5 Ga,1.92 Ga,1.87–1.85 Ga and 1.83 *** belonging to the latter three age groups show similar characteristics of low Th and U contents,low Th/U ratios(b 0.1),sector zoning or unzoned internal structures,corresponding to the features of zircon growth during *** 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 *** formed through solid-state recrystallization during peak metamorphic stage inherited the relatively highLu/Hf ratios and lowHf/Hf ratios of zircons from the *** youngest U–Pb age of ca.1899 Ma is interpreted as the maximum estimate of the time of peak *** formed through intergranular melt growth during low-to mediumpressure retrogression display homogeneous Lu–Hf isotope compositions,lowLu/Hf and highHf/Hf *** 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 *** zircon grains with prismatic morphology and lowLu/Hf andHf/Hf ratios display heterogeneous Lu–Hf isotopic compositions,possibly related to coupled dissolution–*** U–Pb ages of these zircons are identical to those

关键词： Zircon geochronology High pressure metamorphism Lu–Hf isotope system jiaobei terrane North China Craton

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Convergent margin magmatism and crustal evolution during Archean-Proterozoic transition in the jiaobei terrane:Zircon U–Pb ages,geochemistry,and Nd isotopes of amphibolites and associated grey gneisses in the Jiaodong complex,North China Craton

Convergent margin magmatism and crustal evolution during Arc...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Houxiang Shan Mingguo Zhai Elson P.Oliveira M.Santosh Fang Wang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences University of Chinese Academy of Sciences Department of Geology and Natural Resources Institute of GeosciencesUNICAMP China University of Geosciences (Beijing) Shijiazhuang University of Economics

Mafic metavolcanic rocks and grey gneisses are the dominant components of many Archean terranes and preserve significant imprints and information of the crustal *** we present in situ zircon U-Pb geochronology,whole-rock geochemistry and Nd isotopes of the amphibolites and associated grey gneisses in the drill holes from the jiaobei *** China *** LA-ICP-MS zircon U-Pb data show that the magmatic protoliths of two amphibolites and two grey gneisses crystallized at 2457-2503 Ma followed by the metamorphism at.8-1.9 *** rocks exhibit heterogeneous whole-rock Nd isotopic compositions,with the most radiogenic analyses(ε(t)=+3.8 to+6.9)plotting on or close to the depleted mantle evolution array and the most unradiogenicε(t)extending down *** data suggest that both.5 Ga depleted mantle and ancient continental crust at least as old as3.05 Ga contributed to the magma *** combination with previous zircon Hf isotopic data,it is suggested that the.5-2.6 Ga magmatic events in the entire jiaobei terrane were mostly derived from the reworking of the pre-existing.7-2.8 Ga crustal ***,large variations in Hf-Nd isotopic compositions of abundant rocks at.5 Ga and.7-2.8 Ga in the jiaobei terrane were likely to have resulted from interaction of mantle-derived juvenile magma with ancient crustal materials in the source ***,the peaks of zircon Hf crustal model ages from these rocks do not represent the actual time of crustal growth,but could be artifacts of interaction of magmas from different *** features show that the protoliths of the amphibolites are tholeiitic basalts and can be subdivided into two groups:high-Mg tholeiite basalts(GroupⅠ)and high-Fe tholeiite basalts(GroupⅡ).Trace element systematics indicate that the GroupⅠamphibolites show good affinity to subduction-related tholeiitic arc basalts,whereas the GroupⅡamphibolites represent back-arc lavas modified by subduction *** two groups

关键词： Zircon U–Pb geochronology Nd isotopes Crustal evolution jiaobei terrane North China Craton

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Zircon U–Pb ages,geochemistry,and Nd–Hf isotopes of the TTG gneisses from the jiaobei terrane:Implications for Neoarchean crustal evolution in the North China Craton

Zircon U–Pb ages,geochemistry,and Nd–Hf isotopes of the TT...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Houxiang Shan Mingguo Zhai Fang Wang Yanyan Zhou M.Santosh Xiyan Zhu Huafeng Zhang Wei Wang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences University of Chinese Academy of Sciences Shijiazhuang University of Economics China University of Geosciences (Beijing) Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences

The Precambrian basement in the jiaobei terrane is largely composed of Tonalite-Trondhjemite-Granodiorite(TTG)suite of rocks and offers important insights into the crustal evolution history of the North China Craton(NCC).The LA-ICP-MS zircon U-Pb age data presented in this study show that the magmatic protoliths of the TTG gneisses formed during 2508-2547 Ma and recorded the Paleoproterozoic metamorphism(905 Ma).The rocks are enriched in LILE(Rb,Ba and Sr)and depleted in HFSE(Nb,Ta,Zr and Hf).They are characterized by high Sr contents(406-2906 ppm),Sr/Y ratios(31.3-355)and subchondritic Nb/Ta ratios(18.5-68.9).The TTGs show relatively highΣREE contents(72.0-266 ppm)with strongly enriched LREE((La/Yb)=11.5-121)and positive or negligible negative Eu anomalies(Eu/Eu=0.84-1.89).These geochemical features suggest that the magma source might have been rutile-bearing amphibole *** high Mgnumbers(42-56)and high Cr(153-285 ppm)and Ni contents(22.2-74.5 ppm)indicate interaction with the mantle wedge during magma *** whole rockε(t)values(+2.6to+3.8)and most of the magmatic zirconε(t)values(+1.3 to+7.6)suggest juvenile to evolved isotopic *** these lines of evidence suggest that the TTG rocks in this study formed through partial melting of subducted oceanic slab in a continental arc *** drill holes in the jiaobei terrane are dominated by.5 Ga TTG gneisses,suggesting that the TTG magma at.5 Ga is more widely distributed deep underground than that of.7-2.9 Ga,at least within the approachable depth range of our *** zircon grains from jiaobei TTGs give highε(t)values plotting above the curve of 0.75*εof DM,and their T ages are very close to the time of the zircon ***,the majority of theε(t)values fall below the curve of 0.75*εof DM and their T ages are concentrated between.7-2.9 ***,combining with other related studies,we propose that the.5-2.6 Ga magmatism in the NCC probably represents a coherent even

关键词： TTG gneisses Petrogenesis Crustal evolution jiaobei terrane North China Craton

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Late Neoarchean crustal growth under paired continental arc-back arc system in the North China Craton

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Geoscience Frontiers 2021年第3期12卷 437-457页

作者： Xin He Wei Wang M.Santosh Jiachen Yao Kangting Gao Yuhan Zhang Denggang Lu Lishuang Guo The State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences and ResourcesChina University of GeosciencesBeijing 100083PR China Department of Earth Sciences University of AdelaideSA 5005Australia National Institute of Natural Hazards MEMCBeijing 100085PR China

The late Archean(~3.0-2.5 Ga)was a key period of continental growth globally,which is widely considered to reflect the onset of vigorous plate tectonic activity,although related continental growth modes remain *** we investigate a suite of late Neoarchean metavolcanic rocks from the southwest Qixia area of the jiaobei terrane in the North China *** rocks in this suite include amphibolites,clinopyroxene amphibolites,and hornblende plagioclase *** present zircon U-Pb isotopic data which indicate that the protoliths of these rocks formed during~2549-2511 ***(clinopyroxene)amphibolites correspond to meta-basaltic rocks,with some containing high modal content of *** rocks show moderate to high FeO_(T)(8.96-13.62 wt.%)and TiO_(2)(0.59-1.59 wt.%),flat to less fractionated REE patterns,and mildly negative Th,Nb,and Ta anomalies,resembling those of *** addition,they display positive zirconε_(Hf)(t)values(+2.6 to+8.7),and are devoid of crustal contamination or fractional *** with the low Nb/Yb(mostly<1.60)and(Hf/Sm)_N(mostly<0.95),low to moderate Th/Yb(0.08-0.54),and low V/Sc(5.53-9.19)ratios,these basaltic rocks are interpreted to have been derived from a relatively reduced and depleted mantle source that was mildly metasomatized by hydrous *** hornblende plagioclase gneisses are meta-andesitic rocks,and occur interlayered with the basaltic *** are transitional between tholeiitic and calc-alkaline rock series,and show fractionated REE patterns with evidently negative Th,Nb,and Ta *** depleted zirconε_(Hf)(t)values(+2.4 to+8.4)and quantitative chemical modeling suggest that the andesitic rocks were most likely generated by injection and mixing of juvenile felsic magmas with the tholeiitic basaltic *** general,the chemical features and genesis of late Neoarchean meta-basaltic rocks in our study area resemble those of Mariana back-arc basin *** with regional ge

关键词： Late Neoarchean metavolcanic rocks Continental growth Paired continental arc-back arc jiaobei terrane North China Craton

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