Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1080/00206814.2012.682777 |
Cryogenian ophiolite tectonics and metallogeny of the Central Eastern Desert of Egypt | |
Abd El-Rahman, Yasser1,2; Polat, Ali3; Dilek, Yildirim4; Kusky, Tim M.5,6; El-Sharkawi, Mohamed1; Said, Amir1 | |
通讯作者 | Abd El-Rahman, Yasser |
来源期刊 | INTERNATIONAL GEOLOGY REVIEW
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ISSN | 0020-6814 |
EISSN | 1938-2839 |
出版年 | 2012 |
卷号 | 54期号:16页码:1870-1884 |
英文摘要 | The Central Eastern Desert (CED) is characterized by the widespread distribution of Neoproterozoic intra-oceanic island arc ophiolitic assemblages. The ophiolitic units have both back-arc and forearc geochemical signatures. The forearc ophiolitic units lie to the west of the back-arc related ones, indicating formation of an intra-oceanic island arc system above an east-dipping subducted slab (present coordinates). Following final accretion of the Neoproterozoic island arc into the western Saharan Metacraton, cordilleran margin magmatism started above a new W-dipping subduction zone due to a plate polarity reversal. We identify two belts in the CED representing ancient arc-forearc and arc-back-arc assemblages. The western arc-forearc belt is delineated by major serpentinite bodies running similar to NNW-SSE, marking a suture zone. Ophiolitic units in the back-arc belt to the east show an increase in the subduction geochemical signature from north to south, culminating in the occurrence of bimodal volcanic rocks farther south. This progression in subduction magmatism resulted from diachronous opening of a back-arc basin from north to south, with a bimodal volcanic arc evolving farther to the south. The intra-oceanic island arc units in the CED include coeval Algoma-type banded iron formations (BIFs) and volcanogenic massive sulphide (VMS) deposits. Formation of the BIFs was related to opening of an ocean basin to the north, whereas development of the VMS was related to rifting of the island arc in the south. Gold occurs as vein-type mineral deposits, concentrated along the NNW-SSE arc-forearc belt. The formation of these vein-type gold ore bodies was controlled by the circulation of hydrothermal fluids through serpentinites that resulted in Au mobilization, as constrained by the close spatial association of auriferous quartz veins with serpentinites along the western arc-forearc belt. |
英文关键词 | ophiolites forearc back-arc Neoproterozoic volcanogenic massive sulphides banded iron formations gold-quartz veins Eastern Desert |
类型 | Article |
语种 | 英语 |
国家 | Egypt ; Canada ; USA ; Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000309708700002 |
WOS关键词 | ARABIAN-NUBIAN SHIELD ; METAMORPHIC CORE COMPLEX ; BACK-ARC BASIN ; SID GOLD MINE ; AFRICAN OROGEN ; PROTEROZOIC OPHIOLITES ; CRUSTAL EVOLUTION ; VOLCANIC-ROCKS ; TECTONOMAGMATIC EVOLUTION ; FLUID INCLUSIONS |
WOS类目 | Geology |
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/2XILL650/172898 |
作者单位 | 1.Cairo Univ, Dept Geol, Giza 12613, Egypt; 2.Minist Petr & Mineral Resources, Nasr City, Cairo, Egypt; 3.Univ Windsor, Dept Earth & Environm Sci, Windsor, ON N9B 3P4, Canada; 4.Miami Univ, Dept Geol, Oxford, OH 45056 USA; 5.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China; 6.China Univ Geosci, Minist Educ, Three Gorges Geohazard Res Ctr, Wuhan 430074, Peoples R China |
推荐引用方式 GB/T 7714 | Abd El-Rahman, Yasser,Polat, Ali,Dilek, Yildirim,et al. Cryogenian ophiolite tectonics and metallogeny of the Central Eastern Desert of Egypt[J],2012,54(16):1870-1884. |
APA | Abd El-Rahman, Yasser,Polat, Ali,Dilek, Yildirim,Kusky, Tim M.,El-Sharkawi, Mohamed,&Said, Amir.(2012).Cryogenian ophiolite tectonics and metallogeny of the Central Eastern Desert of Egypt.INTERNATIONAL GEOLOGY REVIEW,54(16),1870-1884. |
MLA | Abd El-Rahman, Yasser,et al."Cryogenian ophiolite tectonics and metallogeny of the Central Eastern Desert of Egypt".INTERNATIONAL GEOLOGY REVIEW 54.16(2012):1870-1884. |
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