Arid
DOI10.1016/j.jafrearsci.2006.04.011
The significance of gneissic rocks and synmagmatic extensional ductile shear zones of the Barud area for the tectonics of the North Eastern Desert, Egypt
Fowler, Abdel-Rahman; Ali, Khaled G.; Omar, Sayed M.; Eliwa, Hassan A.
通讯作者Fowler, Abdel-Rahman
来源期刊JOURNAL OF AFRICAN EARTH SCIENCES
ISSN1464-343X
EISSN1879-1956
出版年2006
卷号46期号:3页码:201-220
英文摘要

The mainly tonalitic gneissic rocks, amphibolites, schists and rarer migmatites of the Barud area, at the southern margin of the Egyptian North Eastern Desert (NED) have previously been viewed as products of ultrametamorphism or granitization of pre-PanAfrican basement. The Qena-Safaga Line of approximately NW-striking steeply dipping faults was also regarded as marking the boundary between these NED rocks and the low grade metavolcanics and ophiolitic melange of the Central Eastern Desert (CED). Detailed investigation of the Barud area indicates that the amphibolites, schists and migmatites formed by shearing and medium grade metamorphism of similar are metavolcanics to those of the CED in normal shear sense extensional ductile shear zones heated by numerous synkinematic dolerite, gabbro, diorite, granodiorite, tonalite and granite dykes. They are thus hot sheared equivalents of the CED metavolcanics and basic arc plutonites, accompanied by sheared mafic and felsic intrusive rocks, and are not deep-seated crystalline basement rocks. The shear zones are interpreted as having formed by arc-rifting, not necessarily reaching the stage of marginal basin formation. Arc-accretion structures and those produced by later orogen squeezing are also described. The somewhat gneissic Barud Tonalitic is found to be entirely magmatic. Following intrusion of the Barud Tonalite, and before or during Hammamat and Dokhan deposition, the NED experienced a rapid uplift relative to the CED (similar to 620-600 Ma) that was not achieved by thrusting along the Qena-Safaga Line. (c) 2006 Elsevier Ltd. All rights reserved.


英文关键词neoproterozoic North Eastern Desert extensional hot ductile shear zones amphibolites arc tectonics Qena-Safaga Line
类型Article
语种英语
国家U Arab Emirates ; Egypt
收录类别SCI-E
WOS记录号WOS:000241478700004
WOS关键词ARABIAN-NUBIAN SHIELD ; SOUTHEAST SINAI PENINSULA ; DOKHAN VOLCANIC SUITE ; PAN-AFRICAN TERRAIN ; CRUSTAL EVOLUTION ; ACCRETIONARY TECTONICS ; ISOTOPIC CONSTRAINTS ; NORTHEASTERN DESERT ; CORE COMPLEX ; SAUDI-ARABIA
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/2XILL650/151818
作者单位(1)United Arab Emirates Univ, Dept Geol, Fac Sci, Al Ain, Abu Dhabi, U Arab Emirates;(2)Egyptian Nucl Mat Author, Cairo, Egypt;(3)Menoufia Univ, Dept Geol, Fac Sci, Shibin Al Kawm, Egypt
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Fowler, Abdel-Rahman,Ali, Khaled G.,Omar, Sayed M.,et al. The significance of gneissic rocks and synmagmatic extensional ductile shear zones of the Barud area for the tectonics of the North Eastern Desert, Egypt[J],2006,46(3):201-220.
APA Fowler, Abdel-Rahman,Ali, Khaled G.,Omar, Sayed M.,&Eliwa, Hassan A..(2006).The significance of gneissic rocks and synmagmatic extensional ductile shear zones of the Barud area for the tectonics of the North Eastern Desert, Egypt.JOURNAL OF AFRICAN EARTH SCIENCES,46(3),201-220.
MLA Fowler, Abdel-Rahman,et al."The significance of gneissic rocks and synmagmatic extensional ductile shear zones of the Barud area for the tectonics of the North Eastern Desert, Egypt".JOURNAL OF AFRICAN EARTH SCIENCES 46.3(2006):201-220.
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