Tectono-sedimentary evolution of active extensional basins controlling the deposition of the Middle Miocene Kareem Forma
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ORIGINAL PAPER
Tectono-sedimentary evolution of active extensional basins controlling the deposition of the Middle Miocene Kareem Formation, southwestern Gulf of Suez, Egypt Ahmed I. Abd El Naby 1 & Mohamed Abd El-Aal 2
Received: 15 August 2015 / Accepted: 23 November 2015 # Saudi Society for Geosciences 2016
Abstract Tectono-sedimentary evolution of the Gulf of Suez active extensional basin affected the deposition of the syn-rift Middle Miocene (Langhian) Kareem Formation. Six interpreted tectono-sedimentary models and lithofacies distribution maps are based mainly on facies interpretation and log data from ten wells. They revealed the paleogeography during six system tracts of the two third-order depositional sequences of this formation. Differential fault block movement resulted in the presence of deep basins beside high-relief areas and consequent sudden thickness and facies changes. The interpretation of depositional settings and the structural evolution during the six system tracts of the two depositional sequences is based on interpretations of earlier tectonics, the interaction between sedimentation and tectonism, subsidence rates, and abrupt thickness as well as facies changes along the individual fault blocks. Keywords Kareem Formation . Fault blocks . Depositional sequence . Extensional basins . Gulf of Suez . Egypt
and the abrupt thickness as well as facies changes along normal faults are the major factors affecting the spatial distribution and architecture of depositional systems adjacent to the fault zones (Gawthorpe and Leeder 2000; Herkat and Guiraud 2006; Jackson et al. 2005; Khalil and McClay 2008; Leeder et al. 2002; Leppard and Gawthorpe 2006; Seger and Alexander 1993). The interaction between sedimentation and tectonism in extensional settings illustrates the role of fault evolution in controlling the deposition, dispersal, and architecture of syn-extensional sediments (Gawthorpe and Hurst 1993; Gawthorpe et al. 1990; Gupta et al. 1999; Hardy et al. 1994; Herkat and Guiraud 2006; Jackson et al. 2005; Khalil and McClay 2008; Winn et al. 2001; Young et al. 2000). The aim of the present study is to construct tectonosedimentary models to understand the interaction between tectonics and sedimentation that controlled the sequence stratigraphy of the syn-rift Middle Miocene (Langhian) Kareem Formation and the tectonic influence on the location of major sediment input points in the southwestern part of the Gulf of Suez.
Introduction The sequence stratigraphy and structural and sedimentological studies of active rift basins demonstrate that subsidence rates
* Ahmed I. Abd El Naby [email protected] Mohamed Abd El-Aal [email protected] 1
Geology Department, Faculty of Science, Ain Shams University, Cairo 11566, Egypt
2
Geology Department, Faculty of Education, Ain Shams University, Cairo, Egypt
Geologic setting The Gulf of Suez system is a northwest elongated structural depression that extends northwest from latitude 27° 30′ N to 30° 00′ N at the northwestern end of the Red Sea. Its width
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