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Neoarchean growth and Paleoproterozoic metamorphism of an Archean ophiolite melange in the North China Craton

文献类型：期刊论文

作者Liu, Hui1,2; Zhang, Hong-Fu2,3; Santosh, M.3,4,5
刊名PRECAMBRIAN RESEARCH
出版日期2019-09-01
卷号331页码:12
关键词Neoarchean ophiolite Zircon geochronology Hf-O isotopes Paleoproterozoic metamorphism Trans-North China Orogen
ISSN号0301-9268
DOI10.1016/j.precamres.2019.105377
英文摘要The 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.
WOS关键词ZIRCON U-PB ; HIGH-PRESSURE GRANULITES ; EPISODIC CRUSTAL GROWTH ; LU-HF ; RETROGRADED ECLOGITES ; TECTONIC EVOLUTION ; EXPERIMENTAL CALIBRATION ; HENGSHAN COMPLEX ; CHICHENG AREA ; O ISOTOPES
资助项目National Natural Science Foundation of China[41688103]
WOS研究方向Geology
语种英语
WOS记录号WOS:000486103400031
出版者ELSEVIER
资助机构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 ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/93693]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Zhang, Hong-Fu
作者单位1.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
推荐引用方式
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.

入库方式： OAI收割

来源：地质与地球物理研究所

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