干旱区生态环境知识资源中心(Arid): Gold endowment in the evolution of the Allaqi-Heiani suture, Egypt: A synthesis of geological, structural, and space-borne imagery data

Arid

DOI	10.1016/j.oregeorev.2019.102938
	Gold endowment in the evolution of the Allaqi-Heiani suture, Egypt: A synthesis of geological, structural, and space-borne imagery data
	Zoheir, Basem 1,2; Emam, Ashraf 3; Abd El-Wahed, Mohamed 4; Soliman, Nehal 5
通讯作者	Emam, Ashraf
来源期刊	ORE GEOLOGY REVIEWS
ISSN	0169-1368
EISSN	1872-7360
出版年	2019
卷号	110
英文摘要	Field and structural studies supported by multi-sensor satellite-based imagery data are attempted to decipher the setting and controls of gold-bearing quartz veins in the central part of the greater Wadi Allaqi district in the South Eastern Desert of Egypt. Here, we assess the evolution of a complex part of the Neoproterozoic Allaqi-Heiani suture (similar to 730-700 Ma) with ample structures demonstrating the final Gondwanan collision. Abundant extensive N-trending folds, sinistral shear zones and oblate fold patterns and strain fabrics exemplifying an oblique convergence and torsion related to a regional similar to E-W compressional regime. In the Wadi Seiga area, the first order upright and overturned folds and thrusts (D1 structures) are mostly obliterated by intense NW-ward transpression, N-ward folding and transcurrent shearing assigned to as D2 and D3 structures. The domal crescentic and mushroom superimposed fold patterns suggest that Type 2 and Type 3 fold interference patterns were synchronous at some time during D2 or D3. Shear zones with abundant signs of plastic deformation and associated with quartz veins, within the axial planes of NNW- and NNE-trending F3 folds may imply gold mineralization during the third deformation stage (D3). The latter was supplemented or terminated by an episode of northward tectonic escape and slip reactivation of the pre-existing NW-trending faults. Integrated with field measurements, satellite-based radar and radiometer data abetted untangling the superimposed structures. Gold occurrences in the area are confined to domains of superimposed foliations, foliation deflection/steepening, foliation refraction and substantial strain partitioning, or at oppositely interfered plunging folds. The scattered small scale occurrences of <= 10 s g/t Au-bearing gold-quartz veins in such high strain zones, together with the lack of spatial association with a particular intrusive phase weigh with the metamorphic model for gold-only endowment in the area. The peak metamorphic conditions (amphibolite facies) in the central Allaqi-Heiani suture were attained not earlier than 630 Ma, during the collision of the Arabian-Nubian Shield with the Nile Craton to the west (provoked at 670-610 Ma). Gold-only endowment was complementing to the latest stages of deformation and terrane cooling between 610 and 585 Ma. Listvenitization of tectonized ophiolites and widespread sericite alteration of the island arc metavolcaniclastic rocks could have been promoted by the late-orogenic felsic intrusions (similar to 603 Ma) that filled oblate dilation spaces developed by structural transport to the north. The late orogenic timing of mineralization is one of many features making the Allaqi-Heiani suture comparable to well-documented global examples of accretionary metallogenic belts.
英文关键词	Gold-only mineralization Allaqi-Heiani suture Structural evolution Satellite-based multispectral and microwave imagery data East-West Gondwana collision
类型	Article
语种	英语
国家	Egypt ; Germany
收录类别	SCI-E
WOS记录号	WOS:000474320900006
WOS关键词	SOUTH-EASTERN-DESERT ; ARABIAN-NUBIAN SHIELD ; OROGENIC GOLD ; SHEAR-ZONE ; GEODYNAMIC SETTINGS ; AFRICAN OROGEN ; MINERALIZATION ; SUDAN ; EXPLORATION ; TECTONICS
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/2XILL650/217824
作者单位	1.Benha Univ, Geol Dept, Fac Sci, Banha 13518, Egypt; 2.Univ Kiel, Inst Geosci, Ludewig Meyn Str 10, D-24118 Kiel, Germany; 3.Aswan Univ, Geol Dept, Fac Sci, Aswan 81528, Egypt; 4.Tanta Univ, Geol Dept, Fac Sci, Tanta 31527, Egypt; 5.Natl Author Remote Sensing & Space Sci NARSS, Cairo 1564, Egypt
推荐引用方式 GB/T 7714	Zoheir, Basem,Emam, Ashraf,Abd El-Wahed, Mohamed,et al. Gold endowment in the evolution of the Allaqi-Heiani suture, Egypt: A synthesis of geological, structural, and space-borne imagery data[J],2019,110.
APA	Zoheir, Basem,Emam, Ashraf,Abd El-Wahed, Mohamed,&Soliman, Nehal.(2019).Gold endowment in the evolution of the Allaqi-Heiani suture, Egypt: A synthesis of geological, structural, and space-borne imagery data.ORE GEOLOGY REVIEWS,110.
MLA	Zoheir, Basem,et al."Gold endowment in the evolution of the Allaqi-Heiani suture, Egypt: A synthesis of geological, structural, and space-borne imagery data".ORE GEOLOGY REVIEWS 110(2019).