GEOLOGICAL, STRUCTURAL AND RADIOACTIVITY STUDIES OF WADI SUTRAHUMM GHEIG AREA, CENTRAL EASTERN DESERT, EGYPT

H. Khamees, El-Afandy, El-Tawapty
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Abstract

Wadi Sutrah-Umm Gheig area is located in the Central Eastern Desert, 20 km west of Marsa Alam international airport and 50 km south of the Quseir city. The area represents a part of the Arabian-Nubian Shield. It is also pertaining to the pan-African complex which consists of a folded belt of metasediments and metavolcanics subjected to greenschist-amphibolite facies metamorphism associated with partial melting of amphibolites and development of gneissic and migmatitic rocks. The rocks of the metasediments are tectonically enclosed sheets and lenses of serpentinites, forming an ophiolitic mélange. These rock units intruded by four granitoid groups related to different magmatic and tectonic events. The area was affected by three distinct deformational events (D1–D3). D1 interpreted to have resulted from the closure of inter-arc basins, ophiolite obduction, and collision of East and West Gondwana, representing the earliest phase of deformation in the area. In the area of Umm Ghamis, D1 represented by a series of tight overturned folds which have a NW-SE strike with NE and SW dip directions. During D2 transpression, which marked the terminal stages of the Pan-African Orogeny, along Wadi Sutrah a series of open folds with NW–SE trending axes that plunge mostly to the SE. D3 deformation is thought to be belongs to the regional Najd system, represented by several prominent shear zones and strike-slip faults. The F3 phase folds are trending nearly E-W discordant to the other older two phases F1 and F2.
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埃及中东部沙漠sutrahumm黑格地区地质、构造和放射性研究
Wadi Sutrah-Umm Gheig地区位于中东部沙漠,Marsa Alam国际机场以西20公里,库塞尔市以南50公里。该地区是阿拉伯-努比亚盾牌的一部分。它也属于泛非杂岩,由变质沉积岩和变质火山岩组成的褶皱带,受绿片岩-角闪岩相变质作用的影响,角闪岩部分熔融,片麻岩和混杂岩发育。变质沉积岩是构造封闭的蛇纹岩片状和透镜状,形成蛇绿质杂交岩体。这些岩石单元被四个花岗岩群侵入,这些花岗岩群与不同的岩浆和构造事件有关。该地区受三个不同的变形事件(D1-D3)的影响。D1被解释为弧间盆地闭合、蛇绿岩逆冲和东、西冈瓦纳碰撞的结果,代表了该地区最早的变形阶段。在Umm Ghamis地区,D1以一系列北西-东南走向的致密翻覆褶皱为代表,北东向和南西向倾斜。在泛非洲造山运动末期的D2逆冲期,沿Wadi Sutrah发育了一系列轴向NW-SE的开放褶皱,主要向东南方向俯冲。D3变形被认为属于区域性的Najd系统,以几个突出的剪切带和走滑断裂为代表。F3相褶皱与F1和F2相褶皱的走向几乎是东西向不一致的。
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