Old Continental Crust Underlying Juvenile Oceanic Arc: Evidence From Northern Arabian-Nubian Shield, Egypt

doi:10.1002/2018GL077121

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Old Continental Crust Underlying Juvenile Oceanic Arc: Evidence From Northern Arabian-Nubian Shield, Egypt
	Li, Xian-Hua 1,2; Abd El-Rahman, Yasser 1,3; Abu Anbar, Mohamed 4; Li, Jiao 1; Ling, Xiao-Xiao 1; Wu, Li-Guang1,2 ; Masoud, Ahmed E.4
刊名	GEOPHYSICAL RESEARCH LETTERS
	2018-04-16
卷号	45 期号:7 页码:3001-3008
ISSN号	0094-8276
DOI	10.1002/2018GL077121
英文摘要	The Neoproterozoic Arabian-Nubian Shield (ANS) is the best preserved and the largest exposed Neoproterozoic juvenile crust on Earth. While the lithology and early Sr and Nd isotopic data demonstrate that the ANS crust is overwhelmingly juvenile, pre-ANS old zircon crystals have been increasingly recognized in the ANS igneous and sedimentary rocks, casting doubt on the "juvenility" of the ANS crust. In order to understand the origin of the old continental materials in the ANS and its roles in generation of juvenile oceanic arcs, we carry out for the first time an integrated in situ analysis of zircon U-Pb age and Hf-O isotopes for greywacke and felsic volcanic cobble samples from the Atud Formation in the Eastern Desert of northwestern part of the ANS. Our data indicate that the Atud Formation was deposited between ca. 720 and 700 Ma, concurrent with the production of oceanic arcs in the ANS. The Atud greywacke was derived from the erosion of a proximal arc terrane that contains numerous old continental crust materials. We identify for the first time a 755-Ma felsic volcanic cobble from the Atud Formation that is derived from old continental materials during juvenile crust production, suggesting presence of an old continental crust substrate that underlies the ANS. Our work demonstrates that reworking of old continental crust played important roles in generation of oceanic arcs in the northwestern ANS that is likely much less juvenile than previously thought. Thus, the crustal growth rates calculated based on estimates of temporal island arc development need to be revised.
资助项目	Chinese Academy of Sciences[XDB18030000] ; Chinese Academy of Sciences[QYZDY-SSW-DQC017]
WOS关键词	EAST-AFRICAN OROGEN ; U-PB ; GRANITOID GNEISSES ; SAUDI-ARABIA ; ISLAND ARCS ; ZIRCON ; EVOLUTION ; DESERT ; GROWTH ; CONSTRAINTS
WOS研究方向	Geology
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000435743400015
资助机构	Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88185]
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	Li, Xian-Hua
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China 3.Cairo Univ, Geol Dept, Fac Sci, Giza, Egypt 4.Tanta Univ, Geol Dept, Fac Sci, Tanta, Egypt
推荐引用方式 GB/T 7714	Li, Xian-Hua,Abd El-Rahman, Yasser,Abu Anbar, Mohamed,et al. Old Continental Crust Underlying Juvenile Oceanic Arc: Evidence From Northern Arabian-Nubian Shield, Egypt[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(7):3001-3008.
APA	Li, Xian-Hua.,Abd El-Rahman, Yasser.,Abu Anbar, Mohamed.,Li, Jiao.,Ling, Xiao-Xiao.,...&Masoud, Ahmed E..(2018).Old Continental Crust Underlying Juvenile Oceanic Arc: Evidence From Northern Arabian-Nubian Shield, Egypt.GEOPHYSICAL RESEARCH LETTERS,45(7),3001-3008.
MLA	Li, Xian-Hua,et al."Old Continental Crust Underlying Juvenile Oceanic Arc: Evidence From Northern Arabian-Nubian Shield, Egypt".GEOPHYSICAL RESEARCH LETTERS 45.7(2018):3001-3008.