Arid
DOI10.1016/j.jafrearsci.2017.10.017
Auriferous shear zones in the central Allaqi-Heiani belt: Orogenic gold in post-accretionary structures, SE Egypt
Zoheir, Basem1,2; Emam, Ashraf3; El-Amawy, Maher1; Abu-Alam, Tamer4
通讯作者Abu-Alam, Tamer
来源期刊JOURNAL OF AFRICAN EARTH SCIENCES
ISSN1464-343X
EISSN1879-1956
出版年2018
卷号146页码:118-131
英文摘要

The East-West Gondwana collision (0.75-0.5 Ga), by oblique convergence, was likely accompanied by high hydrothermal fluid flux and dispersed orogenic gold in the Arabian-Nubian Shield. Gold-bearing quartz veins along steep-dipping shear zones bordering or cutting through the ophiolitic and island arc rocks in the central Allaqi-Heiani belt in Wadi Defeit area deserved the interest of ancient miners. Field and remote sensing data revealed the structural and lithological controls of gold-bearing quartz veins, providing means of exploration for new targets in the larger Wadi Allaqi environ. The auriferous shear zones are attributed to D-3 (a non-coaxial continuation of early NE-SW compression regime), and 04 (slip reactivation by E-W compression and transcurrent deformation). Microscopic investigations of quartz veins reveal the association of gold blebs and specks with fissure-filling galena-spahleritetetrahedrite assemblage and deformed Fe-As-sulfides (pyrite and arsenopyrite). As a gold-only province with abundant, variably deformed and carbonated metabasic rocks, metamorphic devolatilization is suggested to explain the discrete gold occurrences by fluid focusing in complex shear intersections. The available fluid inclusion data affirm the low salinity aqueous-carbonic composition of the ore fluids and mesothermal conditions of ore deposition, consistent with metamorphic devolatilization. Structures related to late ductile deformation in the post-accretionary stages of the evolution of the shield are, therefore, considered high priority zones for future exploration programs. (C) 2017 Elsevier Ltd. All rights reserved.


英文关键词East-West Gondwana Wadi Allaui South Eastern Desert Egypt Drogenic gold Metamorphic devolatilization model
类型Article
语种英语
国家Egypt ; Germany ; Norway
收录类别SCI-E
WOS记录号WOS:000447568000009
WOS关键词SOUTH-EASTERN DESERT ; ARABIAN-NUBIAN SHIELD ; SOLAF REGION ; ASTER ; MINERALIZATION ; EVOLUTION ; COMPLEX ; SUTURE ; EXAMPLES ; DEPOSITS
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/2XILL650/210406
作者单位1.Benha Univ, Dept Geol, Fac Sci, Banha 13518, Egypt;
2.Univ Kiel, Inst Geosci, Ludewig Meyn Str 10, D-24118 Kiel, Germany;
3.Aswan Univ, Dept Geol, Fac Sci, Aswan 81528, Egypt;
4.Norwegian Polar Res Inst, Tromso, Norway
推荐引用方式
GB/T 7714
Zoheir, Basem,Emam, Ashraf,El-Amawy, Maher,et al. Auriferous shear zones in the central Allaqi-Heiani belt: Orogenic gold in post-accretionary structures, SE Egypt[J],2018,146:118-131.
APA Zoheir, Basem,Emam, Ashraf,El-Amawy, Maher,&Abu-Alam, Tamer.(2018).Auriferous shear zones in the central Allaqi-Heiani belt: Orogenic gold in post-accretionary structures, SE Egypt.JOURNAL OF AFRICAN EARTH SCIENCES,146,118-131.
MLA Zoheir, Basem,et al."Auriferous shear zones in the central Allaqi-Heiani belt: Orogenic gold in post-accretionary structures, SE Egypt".JOURNAL OF AFRICAN EARTH SCIENCES 146(2018):118-131.
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