Arid
DOI10.1016/S0169-1368(01)00035-X
Metallogeny of gold in relation to the evolution of the Nubian Shield in Egypt
Botros, NS
通讯作者Botros, NS
来源期刊ORE GEOLOGY REVIEWS
ISSN0169-1368
出版年2002
卷号19期号:3-4页码:137-164
英文摘要

Gold mineralization in the Eastern Desert of Egypt is confined, almost completely, to the basement rocks of the Nubian Shield that was cratonized during the Panafrican orogeny. Island-arc, orogenic and post-orogenic stages are indicated for the tectonic-magmatic evolution of the Nubian Shield in Late Proterozoic times. Different styles of gold mineralization recognised in the Eastern Desert are inferred to have developed during these stages. In the island-arc stage, which is characterized by volcanic and volcaniclastic rocks in an ensimatic environment, gold mineralization is hosted in stratiform to strata-bound Algoma-type BIF and associated tuffaceous sedimentary rocks. Both types represent exhalative deposits, formed during breaks in sub-marine basaltic and bastalic-andesite volcanic eruptions. The volcanic rocks have a tholeiitic, affinity and reflect an immature arc stage. Gold hosted in massive-sulphide deposits within calc-alkaline rhyolites represents another style of gold mineralization connected with mature island arc stage. During the orogenic-stage, ophiolites and island are volcanic and volcaniclastic: rocks were thrust onto the Pre-Panafrican continental margin. Subduction was active beneath the continent while the thrusting was still operative. A phase of calc-alkaline magmatic activity developed during this stage and the compressional deformation event was synchronous with regional metamorphism (greenschist-amphibolite facies). Extensional shear fractures (brittle-ductile shear zones) were broadly contemporaneous with the intense compressional tectonic regime. These fractures opened spaces in which the mineralizing fluids penetrated. Gold mineralization associated with the orogenic-stage is represented by vein-type mineralization that constituted the main target for gold since Pharaonic times. Other styles of gold mineralization during this stage are represented by altered ophiolitic serpentinites (listwaenites), Gold mineralization associated with intrusion related deposits (possibly porphyry copper deposits), as well as, auriferous quartz veins at the contacts of younger gabbros and G-2 granites. The post-orogenic stage is characterized by the dominance of intra-plate magmatism. Small amounts of the element in disseminations, stockworks and quartz veins of Sn-W-Ta-Nb mineralization represent gold mineralization connected with this stage. The link between these tectonic-magmatic stages and gold mineralization can be used as a criterion at any exploration strategy for new targets of gold mineralization in Egypt. (C) 2002 Elsevier Science B,V. All rights reserved.


英文关键词upper Proterozoic Nubian Shield Panafrican belt gold mineralization
类型Review
语种英语
国家Egypt
收录类别SCI-E
WOS记录号WOS:000176022100001
WOS关键词EASTERN DESERT ; GEOCHEMISTRY ; AFRICA ; RIDGE ; ROCKS
WOS类目Geology ; Mineralogy ; Mining & Mineral Processing
WOS研究方向Geology ; Mineralogy ; Mining & Mineral Processing
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/143503
作者单位(1)Egyptian Geol Survey, Dakahlia, Egypt
推荐引用方式
GB/T 7714
Botros, NS. Metallogeny of gold in relation to the evolution of the Nubian Shield in Egypt[J],2002,19(3-4):137-164.
APA Botros, NS.(2002).Metallogeny of gold in relation to the evolution of the Nubian Shield in Egypt.ORE GEOLOGY REVIEWS,19(3-4),137-164.
MLA Botros, NS."Metallogeny of gold in relation to the evolution of the Nubian Shield in Egypt".ORE GEOLOGY REVIEWS 19.3-4(2002):137-164.
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