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Cryogenian accretion of the Northern Arabian-Nubian shield: Integrated evidence from central Eastern Desert Egypt

文献类型：期刊论文

作者Peng, Peng2,3; Abu Anbar, Mohamed Metwaly1; He, Xiao-Fang4; Liu, Xu2,3; Qin, Zhaoyuan2,3
刊名PRECAMBRIAN RESEARCH
出版日期2022-04-01
卷号371页码:15
关键词Northern Arabian-Nubian shield Mozambique ocean Calc-alkaline magmatism Ophiolitic complex Baddeleyite U-Pb age Arc accretion
ISSN号0301-9268
DOI10.1016/j.precamres.2022.106599
英文摘要Accretionary geology of the Arabian-Nubian shield (ANS) is critical in deciphering the Neoproterozoic global tectonics. Multidiscipline investigation of ophiolites, sediments, and igneous units of central Eastern Desert Egypt results in a revisited tectono-magmatic scenario. The first baddeleyite U-Pb age (ca. 687 Ma) of the ANS ophiolites is obtained from the layered gabbro of the Wadi Ghadir ophiolite, which limits the back-arc spreading age. Significant Archean-Paleoproterozoic detrital zircon age spectrum, similar to those of the Saharan-Congo craton, is identified from a conglomerate of the Atud turbidites, indicating the existence of craton basement in the shield. Significant ca. 840 Ma and ca. 750 Ma detrital zircon ages with a mixing of juvenile and ancient Hf isotope features approve the provenances to be arc(s) with craton basement. Two episodes of calc-alkaline units represented by the Umm Rus complex (URC) and the El Sibai complex (ESC) are dated at ca. 680 Ma and ca. 660 Ma, respectively. They were both originated from juvenile sources (in situ zircon epsilon Hf-t = +6.1 ~ +12.2) with depleted high-strengthen field elements (e.g., Nb, Ta, Zr, Hf) but enriched large ion lithophile (e.g., Ba, Sr) and radiogenic elements (e.g., Th, U). The Ti-in-zircon temperature of the ESC granitoids (696 +/- 16 ?C) is lower than that of the older URC (749 +/- 21 ?C), as well as the inferred ca. 840 Ma and ca. 750 Ma arcs; and this reconciles an increased hydrous melting during the final Gondwana assembly. The older plutons represented by the URC show an E-W elongated distribution consistent with the alignment of the regional imbricated thrusting; whereas the elongation of the younger generation represented by the ESC is N-NE to S-SW and is coherent with the axis of the core complexes and the major strike-slip faults of the region. This possibly coincides a direction-change of paleosubduction. In summary, the Northern ANS likely represents a superimposed arc accreted at 680-660 Ma during the closure of the Mozambique ocean.
WOS关键词CONTINENTAL-CRUST ; GEOCHEMICAL CONSTRAINTS ; METAMORPHIC COMPLEX ; GRANITE MAGMATISM ; DOKHAN VOLCANICS ; LU-HF ; EVOLUTION ; ZIRCON ; ARC ; MANTLE
资助项目National Natural Science Foundation of China[41890833] ; National Natural Science Foundation of China[42125206] ; National Natural Science Foundation of China[41772192] ; projects of Chinese Academy of Sciences[XDB41020500] ; projects of Chinese Academy of Sciences[QYZDB-SSW-DQC042] ; projects of Chinese Academy of Sciences[GJHZ2016]
WOS研究方向Geology
语种英语
WOS记录号WOS:000807874800001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; projects of Chinese Academy of Sciences ; projects of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; projects of Chinese Academy of Sciences ; projects of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; projects of Chinese Academy of Sciences ; projects of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; projects of Chinese Academy of Sciences ; projects of Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/106080]  
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Peng, Peng
作者单位1.Tanta Univ, Fac Sci, Geol Dept, Tanta, Egypt
2.Chinese Acad Sci, China Brazil Joint Geosci Res Ctr, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Sch Earth & Planetary Sci, Beijing 100049, Peoples R China
4.China Univ Min & Technol Beijing, Sch Geosci & Surveying Engn, Beijing 100083, Peoples R China
推荐引用方式
GB/T 7714		 Peng, Peng,Abu Anbar, Mohamed Metwaly,He, Xiao-Fang,et al. Cryogenian accretion of the Northern Arabian-Nubian shield: Integrated evidence from central Eastern Desert Egypt[J]. PRECAMBRIAN RESEARCH,2022,371:15.
APA Peng, Peng,Abu Anbar, Mohamed Metwaly,He, Xiao-Fang,Liu, Xu,&Qin, Zhaoyuan.(2022).Cryogenian accretion of the Northern Arabian-Nubian shield: Integrated evidence from central Eastern Desert Egypt.PRECAMBRIAN RESEARCH,371,15.
MLA Peng, Peng,et al."Cryogenian accretion of the Northern Arabian-Nubian shield: Integrated evidence from central Eastern Desert Egypt".PRECAMBRIAN RESEARCH 371(2022):15.

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来源：地质与地球物理研究所

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