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Chicheng high-pressure granulites record the paleoproterozoic tectonic evolution in the northern North China Craton

文献类型：期刊论文

作者Liu, Hui1,3; Zhang, Hong-Fu2,3
刊名PRECAMBRIAN RESEARCH
出版日期2021-07-01
卷号359页码:12
关键词High-pressure granulite Zircon geochronology Hf-O isotopes Paleoproterozoic metamorphism Trans-North China Orogen
ISSN号0301-9268
DOI10.1016/j.precamres.2021.106213
英文摘要High-pressure (HP) mafic granulites are widely distributed along the Trans-North China Orogen (TNCO), and they provide important insights into the timing and tectonic processes involved in the formation of the TNCO. We discovered three types of HP granulite, including mafic, intermediate, and felsic granulites, exposed in Chicheng area, in the northern segment of the TNCO. Their mineral assemblages of prograde, peak, and post-peak metamorphic stages were identified based on petrographic investigations. SIMS U-Pb zircon analyses yielded an upper intercept age of 2547 +/- 38 Ma and a lower intercept age of 1916 +/- 100 Ma for one HP mafic granulite and a discordant Pb-207/Pb-206 age of 2479 Ma with a weighted mean Pb-207/Pb-206 age of 1905 +/- 9 Ma for the other HP mafic granulite. For the HP intermediate granulite, an upper intercept age of 2544 +/- 20 Ma was obtained. The HP felsic granulite yielded an upper intercept age of 2524 +/- 23 Ma and a concordant Pb-207/Pb-206 age of 1906-1907 Ma. These results reveal that the protoliths of HP granulites were formed at similar to 2.5-2.55 Ga and underwent high pressure granulite facies metamorphism at similar to 1.9 Ga. The elevated Hf isotopic compositions of the metamorphic zircons from two granulite samples indicate that metamorphic fluids that have high Hf-176/Hf-177 ratios but low Lu-176/Hf-177 ratios were involved in their metamorphism. The low O-18 isotopic features of the zircons from the intermediate granulite suggest alteration by delta O-18-depleted seawater or meteoric fluids at high temperatures. By integrating geochronological data from previous studies, we infer that the formation of the TNCO may have begun as early as similar to 1.9 Ga and lasted until similar to 1.8 Ga, supporting the hypothesis that it was formed by a long-lived tectono-metamorphic event.
WOS关键词U-PB ; LU-HF ; METAMORPHIC EVOLUTION ; ZIRCON MEGACRYSTS ; HENGSHAN COMPLEX ; SANGGAN AREA ; T EVOLUTION ; O ISOTOPES ; SM-ND ; ROCKS
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:000652106800024
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/132A11/102039]  
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Liu, Hui
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Hui,Zhang, Hong-Fu. Chicheng high-pressure granulites record the paleoproterozoic tectonic evolution in the northern North China Craton[J]. PRECAMBRIAN RESEARCH,2021,359:12.
APA Liu, Hui,&Zhang, Hong-Fu.(2021).Chicheng high-pressure granulites record the paleoproterozoic tectonic evolution in the northern North China Craton.PRECAMBRIAN RESEARCH,359,12.
MLA Liu, Hui,et al."Chicheng high-pressure granulites record the paleoproterozoic tectonic evolution in the northern North China Craton".PRECAMBRIAN RESEARCH 359(2021):12.

入库方式： OAI收割

来源：地质与地球物理研究所

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