Structural setting of the area south of the new administrative capital, Cairo – Suez District, Egypt | ||
| Egyptian Journal of Geology | ||
| Volume 69, Issue 1, 2025, Pages 301-315 PDF (1.94 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/egjg.2025.416376.1126 | ||
| Author | ||
| Waheed A. M. Hashem* | ||
| Department of Geology, Faculty of Science, Ain Shams University, Cairo, Egypt | ||
| Abstract | ||
| The study area is located east of the Greater Cairo area between the Cairo-Suez and the Cairo-Ain Soukhna Roads and is bordered on the northwest by the first phase of the New Administrative Capital City. The main objectives of this study include studying the geological structures of the area and interpreting its deformation history. A geological map at a scale of 1:20 000 has been constructed and shows that the exposed rocks in the area are Middle Eocene to Oligocene sedimentary rocks with limited basaltic extrusives. These rocks form El-Qattamiya and Abu Treifiya Plateaus and the intervening Umm Rihyiat Depression. The Middle and Upper Eocene rocks in the area are dissected by three predominant sets of normal faults oriented NNW-SSE, NW-SE and E-W. The E-W oriented faults exist in the northern part of the area and have left-stepped en echelon arrangement that probably originated by strike-slip displacement on underlying deep-seated faults. These en echelon fault belts act as transfer zones between major NW-oriented faults. The NW and NNW oriented faults are characterized by relatively large lengths and displacements. The time of deformation in the study area pre-dated the extrusion of the basaltic rocks (i.e. Late Eocene) and the developed structures were rejuvenated later during the Early Miocene time. The damage zones of the NW-SE and E-W oriented faults have equal width despite their different lengths and throws. It can be concluded that the lithology of the rock units has significant influence on the width of the damage zone. The fractures in the damage zones form two sets, a main set parallel or subparallel to the fault (related to local strain fields in vicinity of the fault) and another set probably related to the regional stress field that affected the Cairo-Suez District. | ||
| Keywords | ||
| Gebel Abu Treifiya; Gebel Qattamiya; Um Rihiyat Depression; Structural Setting; Fault Damage Zones; Cairo-Suez District | ||
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