当前位置: X-MOL 学术Arab. J. Geosci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Structural analyses and geological studies of the Late Precambrian Basement Complex in Wadi Faliq El Sahl–Faliq El Waar area, North Eastern Desert, Egypt
Arabian Journal of Geosciences Pub Date : 2021-09-17 , DOI: 10.1007/s12517-021-08399-z
El-Sayed Soliman El-Wakel 1 , Mohamed Mohamed El-Sayed 1 , Hassan Ismail El-Sundoly 2 , Mahmoud Hani Shalaby 2
Affiliation  

The Wadi Faliq El Sahl–Faliq El Waar area comprises four various types of rocks including metavolcanics, older granites, Hammamat sediments, and younger granites of monzogranite and syenogranite composition. From the various structural analyses in the investigated area, the main trends controlling the structural and tectonic framework are ENE-WSW and NE-SW, while the trends NNE-SSW, WNW-ESE, and N-S are less abundant. Three major phases of deformation are detected in the study area, each of which gives its specific trends according to the applied stress axis during the time of deformation. The first phase shows compressive stress whose σ1 maximum compressional axis was E-W trend (N81°W). The second phase is a compression phase in which the σ1 maximum compression axis was directed N13°W. The third phase represents a trans-tensional (extensional) stress system, in which the maximum tension force (σ1) is in the N-S trend. The study area passed through four stages of evolution, which are (1) the arc-metavolcanic formation with island arc assemblage and the intrusion of older granitoids during the inter-collision of the island arcs; (2) the tectonic processes forming the inter-mountainous basins; (3) the folding of the Hammamat basin under Najd-related shear zones; and (4) the intrusion of syenogranite and uplifting of the Hammamat sediments during the Late Precambrian rifting. The potash-rich outer zone of pegmatite bosses in the younger granites recorded high values of gamma radioactivity with U content.



中文翻译:

埃及东北部沙漠 Wadi Faliq El Sahl-Faliq El Waar 地区晚前寒武纪基底复合体的结构分析和地质研究

Wadi Faliq El Sahl–Faliq El Waar 地区包含四种不同类型的岩石,包括变质火山岩、较老的花岗岩、哈马马特沉积物以及由二长花岗岩和正长花岗岩组成的年轻花岗岩。从调查区的各种构造分析来看,控制构造和构造格架的主要趋势是ENE-WSW和NE-SW,而NNE-SSW、WNW-ESE和NS的趋势较少。在研究区域检测到三个主要的变形阶段,每个阶段根据变形期间施加的应力轴给出其特定的趋势。第一阶段显示压缩应力,其 σ1 最大压缩轴为 EW 趋势(N81°W)。第二阶段是σ1最大压缩轴指向N13°W的压缩阶段。第三阶段代表一个跨张力(拉伸)应力系统,其中最大张力 (σ1) 处于 NS 趋势。研究区经历了四个演化阶段:(1) 岛弧组合形成的弧变火山地层和岛弧相互碰撞过程中老花岗岩的侵入;(2) 形成山间盆地的构造过程;(3) 哈马马特盆地在 Najd 相关剪切带下的褶皱;(4)晚前寒武纪裂谷期正长花岗岩的侵入和哈马马特沉积物的抬升。年轻花岗岩中伟晶岩凸台的富含钾的外部区域记录了具有 U 含量的高伽马放射性值。(1) 岛弧相互碰撞过程中,岛弧组合形成的弧变火山地层和老花岗岩的侵入;(2) 形成山间盆地的构造过程;(3) 哈马马特盆地在 Najd 相关剪切带下的褶皱;(4)晚前寒武纪裂谷期正长花岗岩的侵入和哈马马特沉积物的抬升。年轻花岗岩中伟晶岩凸台的富含钾的外部区域记录了具有 U 含量的高伽马放射性值。(1) 岛弧相互碰撞过程中,岛弧组合形成的弧变火山地层和老花岗岩的侵入;(2) 形成山间盆地的构造过程;(3) 哈马马特盆地在 Najd 相关剪切带下的褶皱;(4)晚前寒武纪裂谷期正长花岗岩的侵入和哈马马特沉积物的抬升。年轻花岗岩中伟晶岩凸台的富含钾的外部区域记录了具有 U 含量的高伽马放射性值。(4)晚前寒武纪裂谷期正长花岗岩的侵入和哈马马特沉积物的抬升。年轻花岗岩中伟晶岩柱的富含钾的外部区域记录了具有 U 含量的高伽马放射性值。(4)晚前寒武纪裂谷期正长花岗岩的侵入和哈马马特沉积物的抬升。年轻花岗岩中伟晶岩凸台的富含钾的外部区域记录了具有 U 含量的高伽马放射性值。

更新日期:2021-09-17
down
wechat
bug