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 ⁴⁰Ar/³⁹Ar 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. A late generation of fibrous pyrite, ubiquitous in microfractures, deposited while the veins re-opened and deformed. The occurrence of free gold particles along with a late-paragenetic assemblage of galena-sphalerite-chalcopyrite(± hessite ± cervelleite) was related to influx of low salinity, metalliferous H₂O-NaCl-CO₂-CH₄ fluids as indicated by the fluid inclusion laser Raman spectroscopy and microthermometry results. Au-mobilization and redeposition at T ≤ 350 °C and P ~ 1 to 1.7 kbar, triggered by intermittent fluid pluses and thermal re-equilibration, were most likely stimulated by extensional structures and within-plate magmatism. Coincident province- and deposit-scale pressure–temperature-time data highlight the pivotal role of the orogenic collapse tectonics in gold endowment in the Central Eastern Desert’s crust.

造山带金矿床虽然被解释为造山带期间的集中流体流动，但通常晚于主要增生事件。几条证据表明，阿拉伯-努比亚地盾中的造山带黄金形成一直持续到造山带坍塌阶段以及相关的快速折返和热再平衡。埃及东部沙漠中的 Gidami 金矿床与后叶理、脆韧剪切带有关，该剪切带使弱叶理的斜钠长辉岩地块变形，年代为 ~ 704 Ma（U-Pb 锆石年龄）。硫化金石英脉表现出表明反复糜棱岩化、再结晶和白云母结晶的结构特征。新⁴⁰ Ar/ ³⁹来自含金石英脉和蚀变围岩的白云母薄片的 Ar 年龄在 ~ 583 Ma 的分析不确定性范围内重叠，这对应于该地区（~ 596 至 582 Ma）与伸展相关的扭曲和快速折返的高潮。激光烧蚀电感耦合等离子体质谱 (LA-ICP-MS) 数据与微结构特征相结合表明，早期形成的黄铁矿世代经历了大量的流体介导的再结晶，并且一组金属被后来的流体重新活化。在微裂缝中普遍存在的新一代纤维状黄铁矿在矿脉重新打开和变形时沉积。游离金颗粒的出现以及方铅矿-闪锌矿-黄铜矿（± hessite ± cervelleite）的晚期共生组合与低盐度、含金属 H 的流入有关₂ O-NaCl-CO ₂ -CH ₄流体如流体包裹体激光拉曼光谱和显微测温结果所示。在T  ≤ 350 °C 和P  ~ 1 至 1.7 kbar 时，由间歇性流体脉冲和热再平衡触发的Au 动员和再沉积最有可能受到伸展结构和板内岩浆作用的刺激。重合的省级和矿床规模的压力-温度-时间数据突出了造山崩塌构造在中东部沙漠地壳的金禀赋中的关键作用。