Intrusion-related gold deposits (IRGDs) occur in the Eastern Desert (ED) of Egypt within magmatic districts that are exploited for tungsten and tin mineralization. IRGDs and intrusion-related rare metal deposits (IRRMDs) are almost invariably linked with the late to post collisional Younger Granites (YGs) that have three successive phases (I, II and III). At ∼635–630 Ma, the ED underwent a transition in deformation style from compressional to extensional and a switch from subduction with crustal thickening to delamination with crustal thinning. This transition was concurrent with the emplacement of a short magmatic pulse (∼635–630 Ma) that represents a transition between orogenic gold deposits and IRGDs. K-rich calc alkaline granites (phase I and II of the YGs) hosting IRGDs like the Hangalia deposit were emplaced during the time span 630–610 Ma. Alkaline magmatism began at 610 Ma, coexisting with the K-rich calc-alkaline magmatism over the 610–590 Ma time span, where the Fawakhir (598 ± 3 Ma) and Um Had (596 ± 2 Ma) granites that host the IRGDs were emplaced. In time, the alkaline magmatism became more alkaline giving rise to phase III of the YGs that hosts IRRMDs. A distinct metallogenic epoch comprising both IRGDs and IRRMDs, was undergoing extreme growth at ∼600 Ma.

中文翻译：

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埃及与入侵有关的金矿床

与侵入有关的金矿床 (IRGD) 出现在埃及东部沙漠 (ED) 的岩浆区内，这些矿床用于钨和锡矿化。IRGDs 和侵入相关的稀有金属矿床 (IRRMDs) 几乎总是与具有三个连续阶段 (I、II 和 III) 的晚碰撞后年轻花岗岩 (YGs) 相关联。在~635-630 Ma，ED经历了从挤压到拉伸的变形方式的转变，并从地壳增厚的俯冲转变为地壳减薄的分层。这种转变与代表造山金矿床和IRGD之间转变的短岩浆脉冲（~635-630 Ma）的就位同时发生。在 630-610 Ma 的时间跨度内出现了富含 K 的钙碱性花岗岩（YG 的 I 和 II 期），其中包含像 Hangalia 矿床这样的 IRGD。碱性岩浆活动始于 610 Ma，在 610-590 Ma 时间跨度内与富钾钙碱性岩浆活动共存，其中承载 IRGs 的 Fawakhir (598 ± 3 Ma) 和 Um Had (596 ± 2 Ma) 花岗岩位于进驻。随着时间的推移，碱性岩浆作用变得更加碱性，从而产生了承载 IRRMD 的 YG 的 III 相。一个由 IRGD 和 IRRMD 组成的独特的成矿时代，在约 600 Ma 时经历了极端的增长。