Ostracod Response to a Major Middle Jurassic Sea-Level Fall: A Case Study from Southern Tunisia (North Gondwana) with Implications on Regional Stratigraphy and Palaeoenvironmental Reconstruction
Marginal-marine to non-marine ostracod assemblages from the Bajocian (Mid-Jurassic) of southern Tunisia, precisely from the Krachoua Formation at the Kef El Anneba section near the Beni Kheddache area, are here described and tested for their utility to improve the stratigraphic accuracy and palaeoen...
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2022-02-01
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| author | Khaled Trabelsi Lassad Tiss Benjamin Sames Yassine Houla Amine Hanini Faycel Elferhi Ahmed Skanji Fekri Kamoun Mohamed Faouzi Zagrarni Michael Wagreich |
| author_facet | Khaled Trabelsi Lassad Tiss Benjamin Sames Yassine Houla Amine Hanini Faycel Elferhi Ahmed Skanji Fekri Kamoun Mohamed Faouzi Zagrarni Michael Wagreich |
| author_sort | Khaled Trabelsi |
| collection | DOAJ |
| description | Marginal-marine to non-marine ostracod assemblages from the Bajocian (Mid-Jurassic) of southern Tunisia, precisely from the Krachoua Formation at the Kef El Anneba section near the Beni Kheddache area, are here described and tested for their utility to improve the stratigraphic accuracy and palaeoenvironmental reconstructions. This particular microfauna consists of 11 species belonging to 6 genera and represents 2 distinct types of species-rich assemblages from this time interval, allowing the interpretation of the depositional setting of the fossiliferous horizon from which the samples derive. The first ostracod assemblage is mainly composed of the brackish to shallow marine species <i>Fastigatocythere</i> sp. Mette, 1995; <i>Vernoniella</i> aff. <i>V</i>. <i>bajociana</i> Bate, 1965b; <i>Paracypris</i> sp. A, <i>Paracypris</i> sp. B, <i>Fabanella sarda</i> Malz et al., 1985; <i>Marslatourella</i> aff. <i>M</i>. <i>bathonica</i> Andreu, 1999; and <i>Fabanella</i> aff. <i>F</i>. <i>bathonica</i> Oertli, 1957. This ostracod biofacies reflects marginal marine (shallow platform, restricted lagoon) conditions in the studied area. In contrast, the second ostracod assemblage is exclusively dominated by the non-marine limnic species <i>Alicenula</i> sp., <i>Theriosynoecum pusilla</i> Rohr, 1976; <i>Theriosynoecum</i> aff. <i>T</i>. <i>aveyronensis</i> Rohr, 1976; and <i>Theriosynoecum</i> sp. Such ostracod biofacies reflects the establishment of (a) permanent freshwater lake(s) in the studied area, triggered by the total emersion of the Bajocian Krachoua platform, presumably as response to the short-term sea-level fall event JBj3 of Haq (2017). The recognized ostracod species from the upper part of the Krachoua Formation at Kef El Anneba section (Medenine area) are particularly similar to those already described from the neighbouring sections of Kezzani (Dhaher area) and Krachoua (Tataouine area), facilitating a stratigraphic calibration of the Krachoua Formation, as well as regional correlations of the respective Bajocian continental event within the southern Tunisian palaeogeographic domain. Moreover, the biogeography of the studied ostracod microfauna from the Mid-Jurassic of southern Tunisia provides further arguments to support the hypothesis of significant biological exchanges between Laurasian and Gondwanan islands, as recently demonstrated by means of a charophyte microflora, indicating that Peri-Tethyan biogeography remained relatively uniform during that time interval and challenging the previous assumption of their endemism. |
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| language | English |
| last_indexed | 2024-03-09T21:51:03Z |
| publishDate | 2022-02-01 |
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| series | Geosciences |
| spelling | doaj.art-9615ba131ecf4b71a746bdd4ceb83e232023-11-23T20:06:52ZengMDPI AGGeosciences2076-32632022-02-011229310.3390/geosciences12020093Ostracod Response to a Major Middle Jurassic Sea-Level Fall: A Case Study from Southern Tunisia (North Gondwana) with Implications on Regional Stratigraphy and Palaeoenvironmental ReconstructionKhaled Trabelsi0Lassad Tiss1Benjamin Sames2Yassine Houla3Amine Hanini4Faycel Elferhi5Ahmed Skanji6Fekri Kamoun7Mohamed Faouzi Zagrarni8Michael Wagreich9Department of Earth Sciences, Faculty of Sciences of Sfax, University of Sfax, Sfax 3038, TunisiaLR GEOGLOB, Department of Earth Sciences, Faculty of Sciences of Sfax, University of Sfax, Sfax 3038, TunisiaDepartment of Geology, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Althanstrasse 14, 1090 Vienna, AustriaDépartement de la Géologie, Office National des Mines, 24 Rue de l′énergie 2035 la Charguia, BP.215, Tunis 1080, TunisiaDépartement de la Géologie, Office National des Mines, 24 Rue de l′énergie 2035 la Charguia, BP.215, Tunis 1080, TunisiaEntreprise Tunisienne d’Activités Pétrolières (ETAP), 54 Avenue Mohamed, Tunis 1002, TunisiaEntreprise Tunisienne d’Activités Pétrolières (ETAP), 54 Avenue Mohamed, Tunis 1002, TunisiaLR GEOGLOB, Department of Earth Sciences, Faculty of Sciences of Sfax, University of Sfax, Sfax 3038, TunisiaU. R. Applied Hydrosciences UR13ES81, Higher Institute of Water Sciences and Techniques, University of Gabes, Cité Erryadh, Gabes 6072, TunisiaDepartment of Geology, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Althanstrasse 14, 1090 Vienna, AustriaMarginal-marine to non-marine ostracod assemblages from the Bajocian (Mid-Jurassic) of southern Tunisia, precisely from the Krachoua Formation at the Kef El Anneba section near the Beni Kheddache area, are here described and tested for their utility to improve the stratigraphic accuracy and palaeoenvironmental reconstructions. This particular microfauna consists of 11 species belonging to 6 genera and represents 2 distinct types of species-rich assemblages from this time interval, allowing the interpretation of the depositional setting of the fossiliferous horizon from which the samples derive. The first ostracod assemblage is mainly composed of the brackish to shallow marine species <i>Fastigatocythere</i> sp. Mette, 1995; <i>Vernoniella</i> aff. <i>V</i>. <i>bajociana</i> Bate, 1965b; <i>Paracypris</i> sp. A, <i>Paracypris</i> sp. B, <i>Fabanella sarda</i> Malz et al., 1985; <i>Marslatourella</i> aff. <i>M</i>. <i>bathonica</i> Andreu, 1999; and <i>Fabanella</i> aff. <i>F</i>. <i>bathonica</i> Oertli, 1957. This ostracod biofacies reflects marginal marine (shallow platform, restricted lagoon) conditions in the studied area. In contrast, the second ostracod assemblage is exclusively dominated by the non-marine limnic species <i>Alicenula</i> sp., <i>Theriosynoecum pusilla</i> Rohr, 1976; <i>Theriosynoecum</i> aff. <i>T</i>. <i>aveyronensis</i> Rohr, 1976; and <i>Theriosynoecum</i> sp. Such ostracod biofacies reflects the establishment of (a) permanent freshwater lake(s) in the studied area, triggered by the total emersion of the Bajocian Krachoua platform, presumably as response to the short-term sea-level fall event JBj3 of Haq (2017). The recognized ostracod species from the upper part of the Krachoua Formation at Kef El Anneba section (Medenine area) are particularly similar to those already described from the neighbouring sections of Kezzani (Dhaher area) and Krachoua (Tataouine area), facilitating a stratigraphic calibration of the Krachoua Formation, as well as regional correlations of the respective Bajocian continental event within the southern Tunisian palaeogeographic domain. Moreover, the biogeography of the studied ostracod microfauna from the Mid-Jurassic of southern Tunisia provides further arguments to support the hypothesis of significant biological exchanges between Laurasian and Gondwanan islands, as recently demonstrated by means of a charophyte microflora, indicating that Peri-Tethyan biogeography remained relatively uniform during that time interval and challenging the previous assumption of their endemism.https://www.mdpi.com/2076-3263/12/2/93ostracodsdepositional environmentsregional stratigraphic correlationKrachoua FormationMiddle JurassicNorth Gondwana |
| spellingShingle | Khaled Trabelsi Lassad Tiss Benjamin Sames Yassine Houla Amine Hanini Faycel Elferhi Ahmed Skanji Fekri Kamoun Mohamed Faouzi Zagrarni Michael Wagreich Ostracod Response to a Major Middle Jurassic Sea-Level Fall: A Case Study from Southern Tunisia (North Gondwana) with Implications on Regional Stratigraphy and Palaeoenvironmental Reconstruction Geosciences ostracods depositional environments regional stratigraphic correlation Krachoua Formation Middle Jurassic North Gondwana |
| title | Ostracod Response to a Major Middle Jurassic Sea-Level Fall: A Case Study from Southern Tunisia (North Gondwana) with Implications on Regional Stratigraphy and Palaeoenvironmental Reconstruction |
| title_full | Ostracod Response to a Major Middle Jurassic Sea-Level Fall: A Case Study from Southern Tunisia (North Gondwana) with Implications on Regional Stratigraphy and Palaeoenvironmental Reconstruction |
| title_fullStr | Ostracod Response to a Major Middle Jurassic Sea-Level Fall: A Case Study from Southern Tunisia (North Gondwana) with Implications on Regional Stratigraphy and Palaeoenvironmental Reconstruction |
| title_full_unstemmed | Ostracod Response to a Major Middle Jurassic Sea-Level Fall: A Case Study from Southern Tunisia (North Gondwana) with Implications on Regional Stratigraphy and Palaeoenvironmental Reconstruction |
| title_short | Ostracod Response to a Major Middle Jurassic Sea-Level Fall: A Case Study from Southern Tunisia (North Gondwana) with Implications on Regional Stratigraphy and Palaeoenvironmental Reconstruction |
| title_sort | ostracod response to a major middle jurassic sea level fall a case study from southern tunisia north gondwana with implications on regional stratigraphy and palaeoenvironmental reconstruction |
| topic | ostracods depositional environments regional stratigraphic correlation Krachoua Formation Middle Jurassic North Gondwana |
| url | https://www.mdpi.com/2076-3263/12/2/93 |
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