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DOI | 10.1016/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
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ISSN | 1464-343X |
EISSN | 1879-1956 |
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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