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| Content Provider | Springer Nature Link |
|---|---|
| Author | Abd El Rahman, Yasser Surour, Adel A. El Manawi, Abdel Hamid W. El Dougdoug, Abdel Monem A. Omar, Sayed |
| Copyright Year | 2014 |
| Abstract | 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. |
| Starting Page | 625 |
| Ending Page | 644 |
| Page Count | 20 |
| File Format | |
| ISSN | 14373254 |
| Journal | International Journal of Earth Sciences |
| Volume Number | 104 |
| Issue Number | 3 |
| e-ISSN | 14373262 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2014-11-09 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Volcanogenic Base metal Precious metal Neoproterozoic Island arc Egypt Geology Geophysics/Geodesy Sedimentology Structural Geology Mineral Resources Geochemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Earth and Planetary Sciences |
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