Geochemistry, geochronology, and Sr-Nd isotopes of the Late Neoproterozoic Wadi Kid volcano-sedimentary rocks, Southern Sinai, Egypt: Implications for tectonic setting and crustal evolution
文献类型：期刊论文
| 作者 | Moghazi, Abdel-Kader M.1,2; Ali, Kamal A.1,7; Wilde, Simon A.3; Zhou, Qin4; Andersen, Tom5; Andresen, Arild5; Abu El-Enen, Mahrous M.6; Stern, Robert J.7 |
| 刊名 | LITHOS
 |
| 出版日期 | 2012-12-01 |
| 卷号 | 154页码:147-165 |
| 关键词 | Arabian-Nubian Shield Sinai Neoproterozoic U-Pb zircon Sr-Nd isotopes |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2012.07.003 |
| 文献子类 | Article |
| 英文摘要 | The Kid Group is one of the few exposures of Neoproterozoic metavolcano-sedimentary rocks in the basement of southern Sinai in the northernmost Arabian-Nubian Shield. It is divided into the mostly metamorphosed volcaniclastic Melhaq and siliciclastic Urn Zariq formations in the north and the mostly volcanic Heib and Tarr formations in the south. The Heib, Tarr, and Melhaq formations reflect an intense episode of igneous activity and immature clastic deposition associated with core-complex formation during Ediacaran time, but Urn Zariq metasediments are relicts of an older (Cryogenian) sedimentary sequence. The latter yielded detrital zircons with concordant ages as young as 647 +/- 12 Ma, which may indicate that the protolith of Urn Zariq schist was deposited after similar to 647 Ma but 19 concordant zircons gave a Pb-206/U-238 weighted mean age of 813 +/- 6 Ma, which may represent the maximum depositional age of this unit. In contrast, a cluster of 11 concordant detrital zircons from the Melhaq Formation yield a weighted mean Pb-206/U-238 age of 615 +/- 6 Ma. Zircons from Heib Formation rhyolite clast define a Pb-206/U-238 weighted mean age of 609 +/- 5 Ma, which is taken to approximate the age of Heib and Tarr formation volcanism. Intrusive syenogranite sample from Wadi Kid yields a Pb-206/U-238 weighted mean age of 604 +/- 5 Ma. These constraints indicate that shallow-dipping mylonites formed between 615 +/- 6 Ma and 604 +/- 5 Ma. Geochemical data for volcanic samples from the Melhaq and Heib formations and the granites show continuous major and trace element variations corresponding to those expected from fractional crystallization. The rocks are enriched in large ion lithophile and light rare earth elements, with negative Nb anomalies. These reflect magmas generated by melting of subduction-modified lithospheric mantle, an inference that is further supported by epsilon Nd(t) = +2.1 to +5.5. This mantle source obtained its trace element characteristics by interaction with fluids and melts from subducting oceanic crust during the Late Cryogenian time, prior to terminal collision between fragments of East and West Gondwana at similar to 630 Ma. Positive epsilon Nd(t) values and the absence of pre-Ediacaran zircons in all but Urn Zariq metasediments indicate minor interaction with Cryogenian and older crust. A model of extensional collapse following continental collision, controlled mainly by lithospheric delamination and slab break-off is suggested for the origin of the post-collision volcanics and granites at Wadi Kid. No evidence of pre-Neoproterozoic sources was found. Kid Group Ediacaran volcanic rocks are compositionally and chronologically similar to the Dokhan Volcanics of NE Egypt, which may be stratigraphic equivalents. (C) 2012 Elsevier B.V. All rights reserved. |
| WOS关键词 | ARABIAN-NUBIAN SHIELD ; EAST-AFRICAN OROGEN ; NORTHWESTERN SAUDI-ARABIA ; TABA METAMORPHIC BELT ; ISUA GREENSTONE-BELT ; U-PB ZIRCON ; SE SINAI ; TRACE-ELEMENT ; CALC-ALKALINE ; SUNDA ARC |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000312684000010 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/84570]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Ali, Kamal A. |
| 作者单位 | 1.King Abdulaziz Univ, Dept Mineral Resources & Rocks, Fac Earth Sci, Jeddah 21589, Saudi Arabia 2.Univ Alexandria, Fac Sci, Dept Geol, Alexandria, Egypt 3.Curtin Univ Technol, Dept Appl Geol, Perth, WA 6845, Australia 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 10029, Peoples R China 5.Univ Oslo, Dept Geosci, N-0316 Oslo, Norway 6.Mansoura Univ, Fac Sci, Dept Geol, Mansoura 35516, Egypt 7.Univ Texas Dallas, Dept Geosci, Richardson, TX 75080 USA |
| 推荐引用方式 GB/T 7714 | Moghazi, Abdel-Kader M.,Ali, Kamal A.,Wilde, Simon A.,et al. Geochemistry, geochronology, and Sr-Nd isotopes of the Late Neoproterozoic Wadi Kid volcano-sedimentary rocks, Southern Sinai, Egypt: Implications for tectonic setting and crustal evolution[J]. LITHOS,2012,154:147-165. |
| APA | Moghazi, Abdel-Kader M..,Ali, Kamal A..,Wilde, Simon A..,Zhou, Qin.,Andersen, Tom.,...&Stern, Robert J..(2012).Geochemistry, geochronology, and Sr-Nd isotopes of the Late Neoproterozoic Wadi Kid volcano-sedimentary rocks, Southern Sinai, Egypt: Implications for tectonic setting and crustal evolution.LITHOS,154,147-165. |
| MLA | Moghazi, Abdel-Kader M.,et al."Geochemistry, geochronology, and Sr-Nd isotopes of the Late Neoproterozoic Wadi Kid volcano-sedimentary rocks, Southern Sinai, Egypt: Implications for tectonic setting and crustal evolution".LITHOS 154(2012):147-165. |
入库方式： OAI收割
来源：地质与地球物理研究所
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