Larger benthic foraminiferal turnover across the Eocene–Oligocene transition at Siwa Oasis, Western Desert, Egypt

Orabi, H.; Beshtawy, M. El; Osman, R.; Gadallah, Mohamed M.

doi:10.1016/j.jafrearsci.2015.03.002

Journal of African Earth Sciences

2015

DOI: 10.1016/j.jafrearsci.2015.03.002

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Larger benthic foraminiferal turnover across the Eocene–Oligocene transition at Siwa Oasis, Western Desert, Egypt

H. Orabi¹,

M. El Beshtawy²,

R. Osman³

et al.

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Cited by 12 publications

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“…(2006) and Wade et al (2011). The upper Paleogene deposits attracted the interest of some researchers in Tunisia, who were able to find the Eocene and lowermost Oligocene in north eastern and central Tunisia (Ben Ismail-Lattrache, 1981, 2000Boukhalfa et al, 2009;Amami Hamdi, 2014;Ben Ismail-Lattrache et al, 2014), in Jordan (Farouk et al, 2013(Farouk et al, , 2015 and in Egypt (Orabi et al, 2015). However, they were never able to find the critical expanded interval of the E/O boundary.…”

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Planktic foraminiferal biostratigraphy, paleoecology and chronostratigraphy across the Eocene/Oligocene boundary in northern Tunisia

Karoui-Yaakoub

Grira

Mtimet

et al. 2017

Journal of African Earth Sciences

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The Eocene-Oligocene (E-O) transition was an epoch of great turnover, in both terrestrial and marine environments. Mammals were highly affected by an extinction event called grande coupure of Stehlin, which has been very well documented in Europe and Asia (Hartenberger, 1998). In America the tropical molluscs underwent a significant extinction event at the beginning of the Oi-1 glaciation in the Oligocene (Hickman, 2003). This drop in temperature was caused by the opening of the Drake Strait, thereby giving rise to the circum Antarctic current, the formation of ice caps on the poles and the development of the psychrosphere in

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mentioning

confidence: 99%

Planktic foraminiferal biostratigraphy, paleoecology and chronostratigraphy across the Eocene/Oligocene boundary in northern Tunisia

Karoui-Yaakoub

Grira

Mtimet

et al. 2017

Journal of African Earth Sciences

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Geological studies and thermal treatment of some Paleogene deposits in east Beni Suef region, Egypt

Amin,

El-Mezayen,

Elkholy

et al. 2024

Acta Geochim

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Petrography, mineralogy, and geochemistry of nitrogenous shale in the Western Desert of Egypt: implications for paleoenvironment

et al. 2023

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Besides nitrate deposits located in the Atacama Desert of Chile and the Mojave Desert of California, the present work documents, for the first time, the occurrence of potassium nitrate as oval-suboval-shaped aggregations associated with the Late Maastrichtian-Early Paleocene Dakhla Shale and the Paleocene-Early Eocene Esna Shale encountered in the northeastern part of the Kharga Oasis, particularly at G. Um El-Ghanayem and G. Ghaneima. Consequently, integrated petrographic, mineralogical, and geochemical investigations were carried out for shale deposits and nitrate salts to reconstruct the paleoenvironmental conditions of shale, reveal the extent to which nitrate salts are genetically related to the paleoenvironment of shale deposits, and build up a complete scenario about the source and the formation mechanism of nitrate salts. The overall results showed that the studied shale deposits were sourced from mafic igneous and quartzose sedimentary provenances where humid climatic conditions were dominant; the transported detrital particles were then settled down under oxidizing bottom water and shallow depositional conditions. Moreover, the nitrate salts are of an epigenetic origin and sourced from the microbial nitrification of organic matter and the wet atmospheric deposition that is believed to be triggered by the active volcanic eruptions during the Late Eocene/Early Oligocene transition where warm climatic conditions prevailed.

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Larger benthic foraminiferal turnover across the Eocene–Oligocene transition at Siwa Oasis, Western Desert, Egypt

Cited by 12 publications

References 41 publications

Planktic foraminiferal biostratigraphy, paleoecology and chronostratigraphy across the Eocene/Oligocene boundary in northern Tunisia

Planktic foraminiferal biostratigraphy, paleoecology and chronostratigraphy across the Eocene/Oligocene boundary in northern Tunisia

Geological studies and thermal treatment of some Paleogene deposits in east Beni Suef region, Egypt

Petrography, mineralogy, and geochemistry of nitrogenous shale in the Western Desert of Egypt: implications for paleoenvironment

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