Arid
DOI10.1016/j.jseaes.2015.11.015
Petrology of the Motaghairat mafic-ultramafic complex, Eastern Desert, Egypt: A high-Mg post-collisional extension-related layered intrusion
Halim, Ali H. Abdel1; Helmy, Hassan M.1,2; Abd El-Rahman, Yasser M.3,4; Shibata, Tomoyuki2; El Mahallawi, Mahmoud M.1; Yoshikawa, Masako2; Arai, Shoji5
通讯作者Helmy, Hassan M.
来源期刊JOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
EISSN1878-5786
出版年2016
卷号116页码:164-180
英文摘要

The geodynamic settings of the Precambrian mafic ultramafic complexes in the Eastern Desert of Egypt have important bearing on understanding the geotectonic evolution of the Arabian Nubian Shield. We present a detailed petrological study on a layered mafic ultramafic intrusion that is located at the contact between the Precambrian continental crust and the Miocene Red Sea oceanic crust. The Motaghairat layered intrusion consists of basal lherzolite, orthopyroxenite, troctolite, olivine gabbro and anorthosite on the top. Variations in modal mineralogy and mineral chemistry along with the chemical composition of these units suggest their derivation from a common high-Mg tholeiitic parent melt through fractional crystallization processes. The parental magma was derived from a metasomatised mantle source. The primitive mantle-normalized patterns of the calculated melts exhibit enrichment in U relative to Th and Ba relative LREE which indicate that the enriched lithospheric mantle source was metasomatised by fluids derived from a subducted oceanic crust rather than by a sediment melt. Geological and petrological evidences suggest that the layered Motaghairat intrusion was emplaced during post-orogenic extension following subduction break-off and lithospheric delamination after the collision between the amalgamated island arc terranes and the Saharan Metacraton. The heat source required to melt the metasomatised lithospheric mantle was derived from the upwelling of hot asthenosphere after the subduction-break-off. (C) 2015 Elsevier Ltd. All rights reserved.


英文关键词Layered intrusion High-Mg magma Post-collision Metasomatised mantle Lithospheric delamination Slab break-off
类型Article
语种英语
国家Egypt ; Japan ; Germany
收录类别SCI-E
WOS记录号WOS:000369456000013
WOS关键词ALASKAN-TYPE COMPLEX ; PRECAMBRIAN CRUSTAL EVOLUTION ; NI-PGE MINERALIZATION ; ARABIAN-NUBIAN SHIELD ; ISLAND-ARC ; NW CHINA ; TECTONIC IMPLICATIONS ; SLAB DETACHMENT ; GREENSTONE-BELT ; GROUP MINERALS
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/2XILL650/194224
作者单位1.Menia Univ, Fac Sci, Dept Geol, Menia 61519, Egypt;
2.Kyoto Univ, Inst Geothermal Sci, Beppu, Oita 8740903, Japan;
3.Cairo Univ, Dept Geol, Giza 12613, Egypt;
4.Tech Univ Bergakad Freiberg, Dept Mineral, D-09596 Freiberg, Germany;
5.Kanazawa Univ, Dept Earth Sci, Kanazawa, Ishikawa 9201192, Japan
推荐引用方式
GB/T 7714
Halim, Ali H. Abdel,Helmy, Hassan M.,Abd El-Rahman, Yasser M.,et al. Petrology of the Motaghairat mafic-ultramafic complex, Eastern Desert, Egypt: A high-Mg post-collisional extension-related layered intrusion[J],2016,116:164-180.
APA Halim, Ali H. Abdel.,Helmy, Hassan M..,Abd El-Rahman, Yasser M..,Shibata, Tomoyuki.,El Mahallawi, Mahmoud M..,...&Arai, Shoji.(2016).Petrology of the Motaghairat mafic-ultramafic complex, Eastern Desert, Egypt: A high-Mg post-collisional extension-related layered intrusion.JOURNAL OF ASIAN EARTH SCIENCES,116,164-180.
MLA Halim, Ali H. Abdel,et al."Petrology of the Motaghairat mafic-ultramafic complex, Eastern Desert, Egypt: A high-Mg post-collisional extension-related layered intrusion".JOURNAL OF ASIAN EARTH SCIENCES 116(2016):164-180.
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