Arid
DOI10.1016/j.jafrearsci.2009.08.003
The northern dome of Wadi Hafafit culmination, Eastern Desert, Egypt: Structural setting in tectonic framework of a scissor-like wrench corridor
Shalaby, Ahmed
通讯作者Shalaby, Ahmed
来源期刊JOURNAL OF AFRICAN EARTH SCIENCES
ISSN1464-343X
出版年2010
卷号57期号:3页码:227-241
英文摘要

Although the gneissic domes in Eastern Desert of Egypt have been studied recently in a considerable detail; their origin remains controversial. Basically four schools of thought exist: one argues for an origin parallel crustal extension, a second suggests emplacement within antiformal stacks, a third envisages young emplacement within a core of a sheath fold and finally some authors believe that the emplacement is due to overlap of regional folds and extension parallel to the fold axes. The Wadi Hafafit Culmination is one of these domes and occupies the southern part of the Central Eastern Desert of Egypt. The culmination is cored with five separated gneissic domes ranging in composition from orthogneiss to paragneiss. They are overthrust by a low-grade, volcano-sedimentary association constituting the Pan-African cover nappes. Detailed structural mapping of the northern dome reveals that, the gneisses are vertically emplaced through the cover rock units. This is based on field evidence which shows that the gneisses experienced vertical flattening associated with exhumation corresponding to coaxial deformation. It is suggested that the emplacement of gneissic core occurred during accretion of the Pan-African nappes. Later, strike-slip shear zones of Najd Fault System and the associated subsidiary shear arrays postdate emplacement of the dome. The gneisses contiguously underlie the Pan-African nappe assemblages through discrete low-angle left-lateral thrust-dominated shear zones from the east. Ongoing accretion of nappe assemblages on the gneisses increases the density contrast between the overlying denser nappe and the underlying lighter quartz-rich gneisses, leading to squeezing the gneissic materials in oblique convergence regime. As a consequence, the gneisses are suggested to have up-domed vertically through the nappe rock units. (C) 2009 Elsevier Ltd. All rights reserved.


英文关键词Pan-African orogeny Eastern Desert Gneissic domes Orogen-parallel oblique convergence
类型Article
语种英语
国家Egypt
收录类别SCI-E
WOS记录号WOS:000276558200003
WOS关键词METAMORPHIC CORE COMPLEX ; ARABIAN-NUBIAN SHIELD ; CONTINENTAL-CRUST ; MEATIQ DOME ; EVOLUTION ; EXTENSION ; ORIGIN ; OROGEN ; GEOCHEMISTRY ; DEFORMATION
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/164768
作者单位(1)Mansoura Univ, Fac Sci, Dept Geol, Mansoura 35516, Egypt
推荐引用方式
GB/T 7714
Shalaby, Ahmed. The northern dome of Wadi Hafafit culmination, Eastern Desert, Egypt: Structural setting in tectonic framework of a scissor-like wrench corridor[J],2010,57(3):227-241.
APA Shalaby, Ahmed.(2010).The northern dome of Wadi Hafafit culmination, Eastern Desert, Egypt: Structural setting in tectonic framework of a scissor-like wrench corridor.JOURNAL OF AFRICAN EARTH SCIENCES,57(3),227-241.
MLA Shalaby, Ahmed."The northern dome of Wadi Hafafit culmination, Eastern Desert, Egypt: Structural setting in tectonic framework of a scissor-like wrench corridor".JOURNAL OF AFRICAN EARTH SCIENCES 57.3(2010):227-241.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Shalaby, Ahmed]的文章
百度学术
百度学术中相似的文章
[Shalaby, Ahmed]的文章
必应学术
必应学术中相似的文章
[Shalaby, Ahmed]的文章
相关权益政策
暂无数据
收藏/分享

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。