الفهرس Only 14 pages are availabe for public view
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Abstract
The non marine Oligocene sediments are exposed in northern Egypt by two formations, Gebel Qatrani and Gebel Ahmer formations, in Fayum, Cairo-Wahat District, 6th of October City, El-Obor City, Nasr City and Cairo-Suez District. The lithologic description of these sections is mainly sandstones and claystones .
Studying the field relationships, lithologic description, grain size analysis and applying the role of sequence stratigraphy led to divided the Gebel Qatrani Formation into five members: Lower Sandstone Member, Claystone Member, Middle Sandstone Member, Clay-Sandstone Member and Upper Sandstone Member.
Six sedimentary tracts were defined in the Oligocene rock units, either marine or non-marine: estuarine-bay sediment tract includes two tracts rejuvenation of the Estuary ”Ur Nil” sediment tract and Multiple story channel fill or Erosion and infill surface in Gebel Qatrani Formation, macrotidal flat sediment tract in Gebel Ahmer Formation, sedimentary bay or lake of El-Obor, the bathyal sedimentary tract in Dabaa Formation, the quasi delta sediment tract in Radwan Formation and turbidities sediment tract in Tinneh Formation .
The analysis of heavy minerals and studying the microfacies lead to that the Gebel Ahmer Formation is partially equivalent to the Upper Sandstone Member of Gebel Qatrani Formation.
Studying of claystone samples by using X-ray diffraction analysis and geochemistery exhibit a great similarities in all samples of Gebel Qatrani members, and reveals the humid climate prevailed during the deposition of all members in Gebel Qatrani Formation.
From imagination the modeling and studying the paleogeography, it can said that the sediments of estuarine bay of the Oligocene sandstones was supplied from the Ur Nil or Libyan River, which was came from rifted lakes in northern Sudan.