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Neoarchean growth and Paleoproterozoic metamorphism of an Archean ophiolite melange in the North China Craton
Liu, Hui1,2; Zhang, Hong-Fu2,3; Santosh, M.3,4,5
2019-09-01
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume331Pages:12
AbstractThe North China Craton (NCC) preserves important records of Neoarchean crustal growth and Paleoproterozoic metamorphism. Here we investigate a suite of metamorphic rocks belonging to the Hongqiyingzi Group from the northern part of the Trans-North China Orogen (TNCO). These rocks are dominantly composed of amphibole plagioclase gneisses with minor retrograded eclogites and serpentinited peridotites. We employ zircon U-Pb geochronology and Hf-O isotopes on the amphibole plagioclase gneisses to unravel the formation age and metamorphic history. The magmatic zircon cores yield upper intercept ages of 2664 Ma and 2518 Ma, suggesting that the protoliths of the Hongqiyingzi gneisses formed in the Neoarchean. The metamorphic rims with lower U and Th concentration yield upper intercept ages of 1840 Ma and 1847 Ma, constraining the timing of metamorphism as ca. 1.85 Ga. The epsilon Hf(t) values of the magmatic zircon grains are dominantly positive, whereas those of the metamorphic grains are negative. Both magmatic and metamorphic zircon grains display a restricted range of delta O-58 (6.11-7.44 parts per thousand), slightly higher than the normal mantle value. These isotopic features indicate that the younger metamorphic event did not modify the Hf-O isotopic compositions. The P-T computations yield temperatures of 700-760 degrees C and pressures to be 5-7 Kbar, suggesting the rocks have been retrograded to amphibolites facies. The retrograded eclogites and serpentinized peridotites of the Hongqiyingzi Group, exposed as tectonic lenses within the amphibole plagioclase gneisses, are interpreted as parts of an ancient oceanic lithosphere, whereas the amphibole plagioclase gneisses represent meta-volcano-sedimentary units. We thus interpret that the Hongqiyingzi Group represents a tectonically dismembered Neoarchean ophiolitic melange that formed on the continental margin and metamorphosed to eclogite facies during deep subduction in Paleoproterozoic and exhumed during Phanerozoic.
KeywordNeoarchean ophiolite Zircon geochronology Hf-O isotopes Paleoproterozoic metamorphism Trans-North China Orogen
DOI10.1016/j.precamres.2019.105377
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordZIRCON U-PB ; HIGH-PRESSURE GRANULITES ; EPISODIC CRUSTAL GROWTH ; LU-HF ; RETROGRADED ECLOGITES ; TECTONIC EVOLUTION ; EXPERIMENTAL CALIBRATION ; HENGSHAN COMPLEX ; CHICHENG AREA ; O ISOTOPES
Language英语
Funding ProjectNational Natural Science Foundation of China[41688103]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000486103400031
PublisherELSEVIER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/93693
Collection岩石圈演化国家重点实验室
Corresponding AuthorZhang, Hong-Fu
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China
4.China Univ Geosci, Sch Earth Sci & Resources, 29 Xueyuan Rd, Beijing 100083, Peoples R China
5.Univ Adelaide, Dept Earth Sci, Adelaide, SA 5005, Australia
First Author AffilicationState Key Laboratory of Lithospheric Evolution
Recommended Citation
GB/T 7714
Liu, Hui,Zhang, Hong-Fu,Santosh, M.. Neoarchean growth and Paleoproterozoic metamorphism of an Archean ophiolite melange in the North China Craton[J]. PRECAMBRIAN RESEARCH,2019,331:12.
APA Liu, Hui,Zhang, Hong-Fu,&Santosh, M..(2019).Neoarchean growth and Paleoproterozoic metamorphism of an Archean ophiolite melange in the North China Craton.PRECAMBRIAN RESEARCH,331,12.
MLA Liu, Hui,et al."Neoarchean growth and Paleoproterozoic metamorphism of an Archean ophiolite melange in the North China Craton".PRECAMBRIAN RESEARCH 331(2019):12.
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