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DOI | 10.1002/2018GL077121 |
Old Continental Crust Underlying Juvenile Oceanic Arc: Evidence From Northern Arabian-Nubian Shield, Egypt | |
Li, Xian-Hua1,2; Abd El-Rahman, Yasser1,3; Abu Anbar, Mohamed4; Li, Jiao1; Ling, Xiao-Xiao1; Wu, Li-Guang1,2; Masoud, Ahmed E.4 | |
2018-04-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:7页码:3001-3008 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Egypt |
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. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000435743400015 |
WOS关键词 | EAST-AFRICAN OROGEN ; U-PB ; GRANITOID GNEISSES ; SAUDI-ARABIA ; ISLAND ARCS ; ZIRCON ; EVOLUTION ; DESERT ; GROWTH ; CONSTRAINTS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27163 |
专题 | 气候变化 |
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. |
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