Anatomy of a mountain : the Thebes Limestone Formation (Lower Eocene) at Gebel Gurnah, Luxor, Nile Valley, Upper Egypt
Berggren, William A.
Knox, Robert W. O'B.
Galal, Wael Fathi
MetadataShow full item record
We present a detailed geologic study of the Thebes Formation at Gebel Gurnah in its locus typicus on the West Bank (opposite Luxor) of the Nile River in the Upper Nile Valley, Egypt. This is the first detailed measurement and lithologic description of the ~ 340 m thick (predominantly) carbonate section. The Thebes Formation is divided into thirteen major lithic units (A to M). We interpret data on the lithologic succession and variations, whole rock/clay mineralogy, and macro/micropaleontology in terms of deposition on a shallow carbonate platform episodically influenced by continental runoff, and describe six depositional sequences that we place in the global framework of Lower Eocene (Ypresian) sequence stratigraphy. We note however significant incompatibilities between the Thebes depositional sequences and the global sequences. We emend the definition of the Thebes Formation by defining its top as corresponding to level 326 m at the top of Nodular Limestone ‘L’ (NLL), and assigning the overlying beds to the Minia Limestone Formation. New biostratigraphic data and revision of previous studies establish the direct assignment of the Thebes Formation to planktonic foraminiferal Zones E4/P6b (upper part), E5/P7 and (indirectly) Zone E6/P8, and (probably, indirectly) Zone E7a/”P9”, and to calcareous nannofossil Zone NP12 and lower Zone NP13 of the Lower Eocene (Ypresian) and provide a temporal framework spanning ~ 2.8 Myr from <52.45 to ~49.6 Ma for the deposition of the Thebes Formation prior to the prominent sea level fall (~ 49.6 Ma) towards the end of the Early Eocene. Dominantly carbonate deposition, with a strongly reduced detrital influx, occurred on a very wide shelf (probably) at least ~ 100 km from the coastline. The thick sedimentary succession and the marked vertical lithologic variations are interpreted as resulting from sea level fluctuations imprinted on a long-term decrease in sea-level associated with rapid subsidence reflecting tectonic relaxation after the major Late Paleocene tectonic reorganization of the Syrian Arc.
Author Posting. © The Author(s), 2017. This is the author's version of the work. It is posted here under a nonexclusive, irrevocable, paid-up, worldwide license granted to WHOI. It is made available for personal use, not for redistribution. The definitive version was published in Journal of African Earth Sciences 136 (2017): 61-108, doi:10.1016/j.jafrearsci.2017.05.008.
Suggested CitationPreprint: King, Christopher, Dupuis, Christian, Aubry, Marie-Pierre, Berggren, William A., Knox, Robert W. O'B., Galal, Wael Fathi, Baele, Jean-Marc, "Anatomy of a mountain : the Thebes Limestone Formation (Lower Eocene) at Gebel Gurnah, Luxor, Nile Valley, Upper Egypt", 2017-05, https://doi.org/10.1016/j.jafrearsci.2017.05.008, https://hdl.handle.net/1912/9539
Showing items related by title, author, creator and subject.
Upper Paleocene-Lower Eocene biostratigraphy of Darb Gaga, Southeastern Kharga Oasis Western Desert, Egypt Ouda, Khaled; Berggren, William A.; Abdel-Sabour, Ayman (2016-02)Paleontological studies on the Upper Paleocene-Lower Eocene succession at Darb Gaga, southeastern Kharga Oasis, Western Desert, Egypt document the changes associated with the Paleocene-Eocene Thermal Maximum (PETM), such ...
Pharaonic necrostratigraphy : a review of geological and archaeological studies in the Theban Necropolis, Luxor, West Bank, Egypt Aubry, Marie-Pierre; Berggren, William A.; Dupuis, Christian; Ghaly, Holeil; Ward, David; King, Christopher; Knox, Robert W. O'B.; Ouda, Khaled A. K.; Youssef, Moustafa; Galal, Wael Fathi (2008-11-09)We present a review of archeological and geological studies on the West Bank as a basis for discussing the geological setting of the tombs and geologically related problems with a view to providing archeologists with a ...
Berggren, William A.; Alegret, Laia; Aubry, Marie-Pierre; Cramer, Ben S.; Dupuis, Christian; Goolaerts, Sijn; Kent, Dennis V.; King, Christopher; Knox, Robert W. O'B.; Obaidalla, Nageh; Ortiz, Silvia; Ouda, Khaled A. K.; Abdel-Sabour, Ayman; Salem, Rehab; Senosy, Mahmoud M.; Soliman, Mamdouh F.; Soliman, Ali (Austrian Geological Society, 2012)The Dababiya corehole was drilled in the Dababiya Quarry (Upper Nile Valley, Egypt), adjacent to the GSSP for the Paleocene/ Eocene boundary, to a total depth of 140 m and bottomed in the lower Maastrichtian Globotruncana ...