Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.1016/j.lithos.2019.05.021 |
| Mid-ocean ridge vs. forearc and subduction settings: Clues from rodingitization of tectonic fragments in the Neoproterozoic ophiolites of the Eastern Desert, Egypt | |
| Surour, Adel A. | |
| 通讯作者 | Surour, Adel A. |
| 来源期刊 | LITHOS
 |
| ISSN | 0024-4937 |
| EISSN | 1872-6143 |
| 出版年 | 2019 |
| 卷号 | 342页码:18-30 |
| 英文摘要 | Tectonic melange fragments (metabasalt and metadiabase) in the ophiolitic serpentinites of the Egyptian Eastern Desert show peculiar mineral assemblages and they provide useful insights into metamorphism and metasomatism. New field and mineralogical data indicate the formation of rodingite at the expense of mid-ocean ridge basalt (MORB) at three localities, namely Wadi Sikait, Wadi Abu Rusheid and Hafafit (SRH belt). These rocks occupy a lower structural horizon in the tectonic melange zone(s), whereas ocean-island and arc basalt and diabase (OIB) is relatively younger with no evidence of rodingite formation. Rodingitization starts at slow-ultraslow spreading centers and continued until subduction and exhumation at an accretionary wedge. It is a process that is characterized by Ca-rich fluids and the development of a complicated blackwall due to superimposed K+ and Mg2+-metasomatism. Oxygen fugacity is fluctuating where it is high for Hafafit and low for Wadi Abu Rusheid rodingites. The Ta/Yb-Th/Yb ratios suggest that rodingitization is not contemporaneous with serpentinization in an island-arc environment but with serpentinization near seamounts at the spreading centers. Combined field observations, whole-rock geochemistry and mineral chemistry data prove that rodingites are formed at the expense of a MORB (mid-ocean basalt) protolith and occupies a lower structural position than unrodingitized IAT (island-arc tholeiite) metadiabases. (C) 2019 Elsevier B.V. All rights reserved. |
| 英文关键词 | Tectonic fragments, rodingite Metasomatism MORE Island-arc basalt Ophiolitic melange Northeast Africa (Egypt) |
| 类型 | Article |
| 语种 | 英语 |
| 国家 | Egypt |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000477091500002 |
| WOS关键词 | MID-ATLANTIC RIDGE ; AU-CU-AG ; ABYSSAL PERIDOTITES ; HIGH-PRESSURE ; SERPENTINITE MELANGE ; OCEANIC LITHOSPHERE ; GREENSTONE-BELT ; PHASE-RELATIONS ; AQUEOUS FLUIDS ; VOLTRI-MASSIF |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/217513 |
| 作者单位 | Cairo Univ, Fac Sci, Geol Dept, Giza 12613, Egypt |
| 推荐引用方式 GB/T 7714 | Surour, Adel A.. Mid-ocean ridge vs. forearc and subduction settings: Clues from rodingitization of tectonic fragments in the Neoproterozoic ophiolites of the Eastern Desert, Egypt[J],2019,342:18-30. |
| APA | Surour, Adel A..(2019).Mid-ocean ridge vs. forearc and subduction settings: Clues from rodingitization of tectonic fragments in the Neoproterozoic ophiolites of the Eastern Desert, Egypt.LITHOS,342,18-30. |
| MLA | Surour, Adel A.."Mid-ocean ridge vs. forearc and subduction settings: Clues from rodingitization of tectonic fragments in the Neoproterozoic ophiolites of the Eastern Desert, Egypt".LITHOS 342(2019):18-30. |
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