New insights from conjugate transfer zones in the southern Cairo-Suez province: Implications for deformation history and mechanism

Faculty Science Year: 2023
Type of Publication: ZU Hosted Pages:
Authors:
Journal: Marine and Petroleum Geology Elsevier Volume:
Keywords : , insights from conjugate transfer zones , , southern    
Abstract:
Detailed structural field mapping with the aid of high resolution satellite images were carried out to identify structural style and geometry of Middle Eocene conjugate divergent transfer zones along the southern part of Cairo-Suez Province, Egypt. Eight conjugate divergent transfer zones are recognized between the tips of oppositely-dipping main boundary faults of the mapped fault blocks. The internal geometry of the conjugate divergent transfer zones is represented by elongated fault belts of left-stepping, en echelon normal faults between the terminations of neutral or overlapped boundary faults. Also, dip polarities of the mapped en echelon faults are found to be related to the stepping of the main boundary faults. Accordingly, three main types of conjugate divergent transfer zones are identified in the present study, which are; right-stepping-, left-stepping- and hybridstepping-related conjugate divergent transfer zones. Structural analysis of the mapped transfer zones revealed a geometric relationship between the overstepping (Os) of the boundary faults and the total lengths (Tl) of the extended en echelon faults. In addition, the geometry of en echelon faults formed between conjugate divergent transfer zones is attributed to the reactivation of deep seated faults by dextral transtension during the Late Eocene and Oligocene-Miocene times. The interaction of the associated preexisting deep seated Riedel shears is found to have controls on sedimentation and present day architecture. The results of this work highlight the role of preexisting basement structures and boundary faults controlling the internal geometry of transfer zones. Because of the significance of transfer zones in petroleum exploration, the findings of this research provide new data that can be correlated with similar transfer zones in the subsurface and other outcrops in extensional systems.
   
     
 
       

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