caa a22 4500 606149546 CHVBK 20210128100534.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00531-014-1093-7 doi (NATIONALLICENCE)springer-10.1007/s00531-014-1093-7 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 [Elektronische Daten] [Yasser Abd El-Rahman, Adel Surour, Abdel El-Manawi, Abdel-Monem El-Dougdoug, Sayed Omar] 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. Springer-Verlag Berlin Heidelberg, 2014 Volcanogenic nationallicence Base metal nationallicence Precious metal nationallicence Neoproterozoic nationallicence Island arc nationallicence Egypt nationallicence Abd El-Rahman Yasser Geology Department, Cairo University, 12613, Giza, Egypt aut Surour Adel Faculty of Earth Sciences, King Abdulaziz University, 80200, Jeddah, Saudi Arabia aut El-Manawi Abdel Geology Department, Cairo University, 12613, Giza, Egypt aut El-Dougdoug Abdel-Monem Faculty of Earth Sciences, King Abdulaziz University, 80200, Jeddah, Saudi Arabia aut Omar Sayed Nuclear Material Authority, El Katamya, Cairo, Egypt aut International Journal of Earth Sciences Springer Berlin Heidelberg 104/3(2015-04-01), 625-644 1437-3254 104:3<625 2015 104 531 https://doi.org/10.1007/s00531-014-1093-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00531-014-1093-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Abd El-Rahman Yasser Geology Department, Cairo University, 12613, Giza, Egypt aut NATIONALLICENCE 700 1- Surour Adel Faculty of Earth Sciences, King Abdulaziz University, 80200, Jeddah, Saudi Arabia aut NATIONALLICENCE 700 1- El-Manawi Abdel Geology Department, Cairo University, 12613, Giza, Egypt aut NATIONALLICENCE 700 1- El-Dougdoug Abdel-Monem Faculty of Earth Sciences, King Abdulaziz University, 80200, Jeddah, Saudi Arabia aut NATIONALLICENCE 700 1- Omar Sayed Nuclear Material Authority, El Katamya, Cairo, Egypt aut NATIONALLICENCE 773 0- International Journal of Earth Sciences Springer Berlin Heidelberg 104/3(2015-04-01), 625-644 1437-3254 104:3<625 2015 104 531