Arid
DOI10.1016/S1342-937X(05)71148-5
A quantitative structural study of late Pan-African compressional deformation in the central eastern desert (Egypt) during Gondwana assembly
Abdeen, MM; Greiling, RO
通讯作者Abdeen, MM
来源期刊GONDWANA RESEARCH
ISSN1342-937X
出版年2005
卷号8期号:4页码:457-471
英文摘要

The Arabian-Nubian-Shield (ANS) is composed of a number of island arcs together with fragments of oceanic lithospere and minor continental terranes. The terranes collided with each other until c. 600 Ma ago. Subsequently, 8 they were accreted onto West Gondwana, west of the present River Nile. Apart from widespread ophiolite nappe emplacement, collisional deformation and related lithospheric thickening appear to be relatively weak. Early post-collisional structures comprise not only extensional features such as fault-bounded (molasse) basins and metamorphic core complexes, but also major wrench fault systems, and thrusts and folds. The Hammamat Group was deposited in fault-bounded basins, which formed due to N-S to NW-SE directed extension. Hammamat Group sediments were intruded by late orogenic granites, dated as c. 595 Ma old. A NNW-SSE-oriented compression prevailed after the deposition of the Hammamat Sediments. This is documented by the presence of NW-verging folds and SE-dipping thrusts that were refolded and thrusted in the same direction. Restoration of a NNW-SSE-oriented balanced section across Wadi Queih indicates more than 25% of shortening. Transpressional wrenching related to the Najd Fault System followed this stage. The wrenching produced NW-SE sinistral faults associated with positive flower structures that comprise NE-verging folds and SW-dipping thrusts. Section restoration across these late structures indicates 15-17% shortening in the NE-SW direction. At a regional scale, the two post-Hammamat compressional phases produced an interference pattern with domes and basins. It can be shown that the Najd Fault System splays into a horsetail structure in the Wadi Queih area and loses displacement towards N and NW The present study shows a distinct space and time relationship between deposition of Hammamat Group/late-Pan-African clastic sediments and late stages of Najd Fault wrench faulting: Hammamat deposition is followed by two episodes of compression, with the second episode being related to Najd Fault transpression. Therefore, the Hammamat sediments do not represent the latest tectonic feature of the Pan-African orogeny in the ANS. The latest orogenic episodes were the two successive phases of compression and transpression, respectively It is speculated that extension during (Hammamat) basin formation was sufficiently effective to reduce the thickness of the orogenic lithosphere until it became gravitationally stable, and incapable of further gravitational deformation.


英文关键词Pan-African Arabian-Nubian Shield section restoration late-orogenic structure transpression
类型Article
语种英语
国家Egypt ; Germany
收录类别SCI-E
WOS记录号WOS:000233276200003
WOS关键词ARABIAN-NUBIAN SHIELD ; METAMORPHIC CORE COMPLEX ; EXTENSIONAL COLLAPSE ; OBLIQUE CONVERGENCE ; SAUDI-ARABIA ; EVOLUTION ; EMPLACEMENT ; OPHIOLITES ; MELANGE ; GEOLOGY
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/2XILL650/149177
作者单位(1)Natl Author Remote Sensing & Space Sci, Cairo, Egypt;(2)Univ Heidelberg, Inst Geol Palaontol, D-69120 Heidelberg, Germany
推荐引用方式
GB/T 7714
Abdeen, MM,Greiling, RO. A quantitative structural study of late Pan-African compressional deformation in the central eastern desert (Egypt) during Gondwana assembly[J],2005,8(4):457-471.
APA Abdeen, MM,&Greiling, RO.(2005).A quantitative structural study of late Pan-African compressional deformation in the central eastern desert (Egypt) during Gondwana assembly.GONDWANA RESEARCH,8(4),457-471.
MLA Abdeen, MM,et al."A quantitative structural study of late Pan-African compressional deformation in the central eastern desert (Egypt) during Gondwana assembly".GONDWANA RESEARCH 8.4(2005):457-471.
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
[Abdeen, MM]的文章
[Greiling, RO]的文章
百度学术
百度学术中相似的文章
[Abdeen, MM]的文章
[Greiling, RO]的文章
必应学术
必应学术中相似的文章
[Abdeen, MM]的文章
[Greiling, RO]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。