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Vein-type gold formation during late extensional collapse of the Eastern Desert, Egypt: the Gidami deposit

Zoheir, Basem ; McAleer, Ryan; Steele-MacInnis, Matthew; Zeh, Armin 1; Bain, Wyatt; Poulette, Spencer
1 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)

Abstract:

Orogenic gold deposits, though construed to focused fluid flow during orogenesis, commonly post-date the main accretionary events. Several lines of evidence indicate that orogenic gold formation in the Arabian–Nubian Shield continued through the orogen collapse stage and associated rapid exhumation and thermal re-equilibration. The Gidami gold deposit in the Eastern Desert of Egypt is associated with post-foliation, brittle-ductile shear zones that deformed a weakly foliated tonalite-trondhjemite massif dated as ~ 704 Ma (U–Pb zircon age). Gold-sulfide quartz veins exhibit textural features indicative of repeated mylonitization, recrystallization, and muscovite crystallization. New $^{40}$Ar/$^{39}$Ar ages of muscovite flakes from the auriferous quartz veins and from the altered wallrock overlap within analytical uncertainty at ~ 583 Ma, which corresponds to the climax of extension-related wrenching and rapid exhumation in the region (~ 596 to 582 Ma). Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) data coupled with microtextural characteristics suggest that early formed pyrite generations experienced substantial fluid-mediated recrystallization, and that a set of metals was remobilized by later fluids. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000153609
Veröffentlicht am 11.12.2022
Originalveröffentlichung
DOI: 10.1007/s00126-022-01152-w
Scopus
Zitationen: 2
Web of Science
Zitationen: 2
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 0026-4598, 1432-1866
KITopen-ID: 1000153609
Erschienen in Mineralium Deposita
Verlag Springer
Band 58
Heft 4
Seiten 681–706
Vorab online veröffentlicht am 22.11.2022
Nachgewiesen in Web of Science
Dimensions
Scopus
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