DOI: 10.1007/s00531-014-1093-7
Scopus记录号: 2-s2.0-84925511097
论文题名: Regional setting and characteristics of the Neoproterozoic Wadi Hamama Zn–Cu–Ag–Au prospect: evidence for an intra-oceanic island arc-hosted volcanogenic hydrothermal system
作者: Abd El-Rahman Y. ; Surour A.A. ; El-Manawi A.H.W. ; El-Dougdoug A.-M.A. ; Omar S.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2015
卷: 104, 期: 3 起始页码: 625
结束页码: 644
语种: 英语
英文关键词: Base metal
; Egypt
; Island arc
; Neoproterozoic
; Precious metal
; Volcanogenic
英文摘要: The Wadi Hamama area is a volcanogenic Zn–Cu–Au–Ag prospect. It is hosted by a Neoproterozoic bimodal-mafic sequence, which comprises basalt, dacite and rhyolite along with volcaniclastic rocks. The rocks have a low-K tholeiitic affinity and are enriched in large ion lithophile elements over high field strength elements, which indicated their formation in an intra-oceanic island arc tectonic setting. The area was intruded by a tonalite–trondhjemite body, which has an intra-oceanic island arc affinity and later by diorite, which has a cordilleran-margin geochemical affinity. These rock units were intruded by post-tectonic granite dykes, which have a within-plate geochemical signature. There is a quartz-carbonate horizon extending along the contact between the basalt and the volcaniclastic rocks, mainly banded and lapilli tuffs. This horizon is of exhalative origin and is underlain by a mushroom-shaped alteration zone extending from the horizon down to the massive basalt. The footwall alteration is characterized by a silica-rich core surrounded by a thick chlorite sheath. Both the quartz-carbonate horizon and the footwall-altered rocks enclose historical trenches and pits. Sulfide-rich core samples are enriched in Zn, relative to Cu, and in Ag, which indicates the low-temperature nature of the hydrothermal system. The prospect was affected by supergene processes, which led to the widespread occurrence of secondary copper minerals and gold enrichment relative to the leached base metals, especially Zn. The prospect formed through a limited rifting of an intra-oceanic island arc which resulted in the formation of a small-scale volcanogenic Zn–Cu–Ag–Au prospect. © 2014, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84925511097&doi=10.1007%2fs00531-014-1093-7&partnerID=40&md5=c79202858980e0f8a215ffd502ad6398
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70299
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Geology Department, Cairo University, Giza, Egypt; Institute of Mineralogy, TU Bergakademie Freiberg, Freiberg, Germany; Helmholtz Institute Freiberg for Recourse Technology, Freiberg, Germany; King Abdulaziz University, Jeddah, Saudi Arabia; Nuclear Material Authority, El Katamya, Cairo, Egypt
Recommended Citation:
Abd El-Rahman Y.,Surour A.A.,El-Manawi A.H.W.,et al. Regional setting and characteristics of the Neoproterozoic Wadi Hamama Zn–Cu–Ag–Au prospect: evidence for an intra-oceanic island arc-hosted volcanogenic hydrothermal system[J]. International Journal of Earth Sciences,2015-01-01,104(3)