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Article

Biostratigraphy and Paleoenvironmental Reconstruction at the Gebel Nezzazat (Central Sinai, Egypt): A Paleocene Record for the Southern Tethys

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Geology Department, Faculty of Science, Damanhour University, Damanhour 22511, Egypt
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Geology Department, Faculty of Science, Tanta University, Tanta 31527, Egypt
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Instituto Oceanográfico da Universidade de São Paulo, Praça do Oceanográfico, 191, São Paulo 05508-120, Brazil
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Dipartimento di Scienze Pure e Applicate (DiSPeA), Università degli Studi di Urbino “Carlo Bo”, 61029 Urbino, Italy
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Institute of Geological Sciences, Oeschger Centre for Climate Change Research, University of Bern, 3012 Bern, Switzerland
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Geology Department, Faculty of Science, Menoufia University, Shebin El-Kom 32511, Egypt
*
Authors to whom correspondence should be addressed.
Academic Editors: Jesus Martinez-Frias and Rossana Sanfilippo
Geosciences 2022, 12(2), 96; https://doi.org/10.3390/geosciences12020096
Received: 24 January 2022 / Revised: 13 February 2022 / Accepted: 17 February 2022 / Published: 20 February 2022
(This article belongs to the Section Sedimentology, Stratigraphy and Palaeontology)
The variations in assemblages of calcareous nannofossils are tracked in the Dakhla and Tarawan Formations exposed at Gebel Nezzazat (central Sinai, Egypt). Five calcareous nannofossil biozones, namely NP2/3, NP4, NP5, NP6, and NP7/8 are identified. A distinct marker bed related to the Latest Danian Event (LDE) occurs within the Dakhla Fm. The earliest representative of fasciculiths, Lithoptychius schmitzii, first occurs just below the LDE distinct bed and is followed by the Los of Diantholitha alata, D. mariposa, L. varolii, L. felis, and L. collaris. The abundance of calcareous nannofossils drops within the LDE distinctive bed. The base of Selandian Stage is here approximated at the base of Zone NP5 in concurrence with a sudden drop in the abundance of calcareous nannofossils. No considerable lithological changes are noted across this transition. The absence of subsequent occurrences of L. ulii, L. janii, L. billii, and L. stegostus suggest inconsistent lowest occurrences (Los) of these taxa, insufficient sampling resolution, and/or a hiatus. The base of Thanetian is approximated with the base of Zone NP7/8 in the topmost of Dakhla Fm. No considerable changes in calcareous nannofossil assemblages are associated in correspondence to this transition except the LO of D. mohleri, lowest continuous occurrence (LctO) of Bomolithus megastypus, and the increase in abundance of Heliolithus kleinpellii as well as a sudden drop in abundance within Zone NP7/8. The variations in calcareous nannofossil assemblages at Gebel Nezzazat suggest prevailing warm-water and oligotrophic conditions during the Paleocene and particularly along the Danian Stage that are interrupted by minor fluctuations in paleoclimatic conditions. In particular, the Danian–Selandian transition marks a decrease in warm and oligotrophic conditions that persisted along the Selandian Stage. The Selandian–Thanetian transition shows an increase of warm and oligotrophic conditions prevailed in the Thanetian record. The sudden decrease in abundance of calcareous nannofossils in both the Selandian and Thanetian is likely resulted from an increase in dissolution of carbonates rather than variations in the paleotemperature and/or paleofertility. View Full-Text
Keywords: nezzazat; sinai; calcareous nannofossils; danian/selandian; selandian/thanetian; paleoclimate nezzazat; sinai; calcareous nannofossils; danian/selandian; selandian/thanetian; paleoclimate
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MDPI and ACS Style

Kasem, A.M.; Faris, M.; Jovane, L.; Ads, T.A.; Frontalini, F.; Zaky, A.S. Biostratigraphy and Paleoenvironmental Reconstruction at the Gebel Nezzazat (Central Sinai, Egypt): A Paleocene Record for the Southern Tethys. Geosciences 2022, 12, 96. https://doi.org/10.3390/geosciences12020096

AMA Style

Kasem AM, Faris M, Jovane L, Ads TA, Frontalini F, Zaky AS. Biostratigraphy and Paleoenvironmental Reconstruction at the Gebel Nezzazat (Central Sinai, Egypt): A Paleocene Record for the Southern Tethys. Geosciences. 2022; 12(2):96. https://doi.org/10.3390/geosciences12020096

Chicago/Turabian Style

Kasem, Atef M., Mahmoud Faris, Luigi Jovane, Taysir Abdelhamid Ads, Fabrizio Frontalini, and Amr S. Zaky. 2022. "Biostratigraphy and Paleoenvironmental Reconstruction at the Gebel Nezzazat (Central Sinai, Egypt): A Paleocene Record for the Southern Tethys" Geosciences 12, no. 2: 96. https://doi.org/10.3390/geosciences12020096

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