International Journal of Earth Sciences

, Volume 105, Issue 5, pp 1387–1415 | Cite as

A new tectono-sedimentary model for Cretaceous mixed nonmarine–marine oil-prone Komombo Rift, South Egypt

Original Paper
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Abstract

The Komombo Basin is a recently discovered mixed nonmarine–marine, petroliferous basin of Cretaceous age in South Egypt. It is an asymmetrical half graben, synchronous with the Neothys opening and filled with up to 4 km of continental to open marine strata ranging from Early to Late Cretaceous. Despite its great relevance, no detailed sedimentological study concerning this basin has been carried out to date. Here, we present an integrated approach to the borehole and core data, as well as unique outcrop sections to construct a new detailed sedimentological interpretation on depositional systems, controls on basin evolution, basin configuration and regional tectonic setting. Seven depositional systems were recognized: (I) a fluvial fan system, (II) a braidplain system, (III) a siliciclastic lacustrine system, (IV) a lacustrine/lagoonal system, (V) a fluvial-estuarine system, (VI) a tidally affected delta, and (VII) an open marine system. The Komombo Basin evolution can be compartmentalized into three main rifting phases: the Berriasian–Early Barremian, Late Barremian, and Aptian–Albian. The first and third rifting phases are comparable with the rifting phases reported for several basins in North and Central Africa. The second rifting phase represents a transitional event between the other two phases. The first three depositional systems consist mainly of continental siliciclastics and are dominant in the Berriasian–Early Barremian and Late Barremian rifting phases. The lacustrine/lagoon and fluvial-estuarine systems correspond to the Aptian–Albian rifting phase, while the Campanian–Maastrichtian open-shelf deposits represents the post-rift stage.

Keywords

Cretaceous Nonmarine Rift Komombo Egypt 

Notes

Acknowledgments

The author is grateful to SeaDragon-Egypt for the permission to use their data and to publish this paper. Prof. M. Darwish and Prof. A. El Manawi (Cairo University) and Eng. Alaa Ghoneimy (General Manager of south asset, SeaDragon-Egypt) are acknowledged for their critical and thorough reviews and suggestions. Dr. Ray Smith (CSIRO, Australia) is thanked for reviewing and editing the manuscript. The author is also grateful to the two reviewers: Prof. Thomas Voigt and Prof. Jochen Kuss, for their critical reading that improved the paper. The author also thanks Editor Prof. Wolf-Christian Dullo for handling the article for International Journal of Earth Sciences.

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© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Department of Geology, Faculty of ScienceCairo UniversityGizaEgypt

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