Diagenetic evolutions of the Lower Eocene carbonate ramp facies, NE-Sohag Governorate, Upper Egypt

Document Type : Regular Articles

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Geology Department, Faculty of Science, Sohag University, P.O. Box 82524, Sohag, Egypt.

10.21608/sjsci.2025.354711.1249

Abstract

The study area (NE-Sohag Governorate, Upper Egypt,) represents an ideal succession of Lower Eocene (Thebes Formation and Drunka Formation) where the Nile Valley Valley is mostly bounded by Lower Eocene successions which are considered as the oldest outcropped carbonate succession. Lower Eocene in NE-Sohag Governorate is subdivided in two distinct formations; Thebes and Drunka formations. The vertical and lateral litho-facies variation was occurred within both Thebes and Drunka formations. Thebes Formation is a basal part of the Lower Eocene sequence that is mainly consisting of yellowish-white laminated and bedded limestone with bands of chert and fine-siliciclastic beds. Drunka Formation overlies conformably to Thebes Formation and is characterized by its snowy white color and more or less horizontality, chert concretions and depositional cyclicity. This variation owes mainly to marine transgression and regres‌sion as a result of global eustatic sea-level variations during Lower Eocene. The most common microfacies within the studied Lower Eocene are lime mudstone, lime wackestone, lime packstone, lime grainstone, and lime dolostones. Petrographically, micritization, neomorphism, cementation, dissolution, dolomitization, fracturing and internal filling and silicification were the most observed diagenetic features within the studied Lower Eocene carbonate successions.

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