Arid
DOI10.1016/j.jafrearsci.2014.06.010
Oppositely dipping thrusts and transpressional imbricate zone in the Central Eastern Desert of Egypt
Abd El-Wahed, Mohamed A.
通讯作者Abd El-Wahed, Mohamed A.
来源期刊JOURNAL OF AFRICAN EARTH SCIENCES
ISSN1464-343X
EISSN1879-1956
出版年2014
卷号100页码:42-59
英文摘要

This paper documents the 40-60 km wide ENE-WSW trending Mubarak-Barramiya shear belt (MBSB) in the Central Eastern Desert of Egypt by examining its structural styles, kinematics and geometry. Our study revealed the existence of prevalent dextral and minor sinistral conjugate shear zones. The MBSB is metamorphic belt (greenschist-amphibolite) characterized by at least three post-collisional (740-540 Ma) ductile Neoproterozoic deformation events (D-1, D-2 and D-3) followed by a brittle neotectonic deformation (D-4). DI event produced early top-to-the-northwest thrust displacements due to NW-SE shortening. Dy produced discrete zones of NNW-trending upright folds and culminated in initiation of major NW-trending sinistral shear zones of the Najd Fault System (NFS, at c. 640-540 Ma ago) as well as steeply dipping Sy foliation, and shallowly plunging L-2 lineation. NW-to NNW-trending Fy folds are open to steep and vary in plunge from horizontal to vertical. Dy deformational fabrics are strongly overprinted by D-3 penetrative structures. D-3 is characterized by a penetrative S-3 foliation, steeply SE- to NW-plunging and shallowly NE-plunging stretching lineations (L-3), asymmetric and sheath folds (F-3) consistent with dextral sense of movement exhibited by delta- and sigma-type porphyroclast systems and asymmetric boudinage fabrics. D-2-D-3 represent a non-coaxial progressive event formed in a dextral NE- over NW-sinistral shear zone during a partitioned transpression in response to E-W-directed compression during oblique convergence between East and West Gondwana developed due to closure of the Mozambique Ocean and amalgamation of the Arabian-Nubian Shield in Cryogenian-early Ediacaran time. (C) 2014 Elsevier Ltd. All rights reserved.


英文关键词Mubarak-Barramiya shear belt Central Eastern Desert Oppositely dipping thrusts Dungash Um Khariga Dextral transpression
类型Article
语种英语
国家Egypt
收录类别SCI-E
WOS记录号WOS:000345473200004
WOS关键词ARABIAN-NUBIAN SHIELD ; NAJD FAULT SYSTEM ; SHEAR ZONE ; AFRICAN OROGEN ; CORE COMPLEX ; GNEISSIC COMPLEX ; BARRAMIYA AREA ; GOLD DEPOSITS ; SAUDI-ARABIA ; EVOLUTION
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/2XILL650/182886
作者单位(1)Tanta Univ, Fac Sci, Dept Geol, Tanta 31527, Egypt
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GB/T 7714
Abd El-Wahed, Mohamed A.. Oppositely dipping thrusts and transpressional imbricate zone in the Central Eastern Desert of Egypt[J],2014,100:42-59.
APA Abd El-Wahed, Mohamed A..(2014).Oppositely dipping thrusts and transpressional imbricate zone in the Central Eastern Desert of Egypt.JOURNAL OF AFRICAN EARTH SCIENCES,100,42-59.
MLA Abd El-Wahed, Mohamed A.."Oppositely dipping thrusts and transpressional imbricate zone in the Central Eastern Desert of Egypt".JOURNAL OF AFRICAN EARTH SCIENCES 100(2014):42-59.
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