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dc.contributor.authorMessaoud, Jihede Haj
dc.contributor.authorThibault, Nicolas
dc.contributor.authorBomou, Brahimsamba
dc.contributor.authorAdatte, Thierry
dc.contributor.authorMonkenbusch, Johannes
dc.contributor.authorSpangenberg, Jorge E.
dc.contributor.authorAljahdali, Mohammed H.
dc.contributor.authorYaich, Chokri
dc.identifier.citationMessaoud, J. H., Thibault, N., Bomou, B., Adatte, T., Monkenbusch, J., Spangenberg, J. E., … Yaich, C. (2021). Integrated stratigraphy of the middle-upper Eocene Souar Formation (Tunisian dorsal): Implications for the Middle Eocene Climatic Optimum (MECO) in the SW Neo-Tethys. Palaeogeography, Palaeoclimatology, Palaeoecology, 581, 110639. doi:10.1016/j.palaeo.2021.110639
dc.description.abstractCalcareous nannofossil biostratigraphy and carbon-isotope stratigraphy on bulk organics of the middle-upper Eocene Souar Formation (Tunisia) allow for a refined stratigraphy of this interval in the southwestern Neo-Tethys margin. The Souar Formation represents the deepest sedimentary deposits of the central northern Tunisian Basin and was only dated previously by coarse data on planktonic foraminifera. Together with our new data, a correlation is proposed to previous Tunisian records of the Halk El Menzal carbonate platform to the NE and shallow-water deposits of central Tunisia to the SW, which leads us to the erection of a synthetic stratigraphic chart of the middle-upper Eocene in central and northeastern Tunisia. Our results allow for a review of the accurate position of the Lutetian / Bartonian and the Bartonian / Priabonian stage boundaries in Tunisia relative to calcareous nannofossil biohorizons. We apply Bayesian statistics to build our age-depth model which points to a hiatus in the Lutetian (CNE12 Zone) that we relate to the middle Lutetian regressive sequence leading to the Lu-4 M-cycle. Radiolarian-rich sediments and cherts of the late Lutetian and early Bartonian are interpreted as a response to an increase in productivity, tied to the seasonal upwelling of nutrient-rich waters. Correlation to other sections in Tunisia highlights the strong contrast in facies between the carbonate-rich sequences of the edges of the dorsal and the silica-rich deposition in the Souar Formation. This contrast is particularly pronounced in the interval before and across the Middle Eocene Climatic Optimum (MECO) characterized by a maximum of nummulitic carbonate production on the platform and a minimum of carbonate production in the deep basinal parts of the Tunisian dorsal, rather dominated by silica-rich sediments.
dc.description.sponsorshipFunding for this study was ensured through internal funds from the University of Copenhagen allocated to J.H.M. via the double-degree Ph.D. program. T.A. and N.T. also acknowledge the IGN International Academy program that facilitated collaboration between KU and Lausanne.
dc.publisherElsevier BV
dc.rightsThis is an open access article under the CC BY license.
dc.titleIntegrated stratigraphy of the middle-upper Eocene Souar Formation (Tunisian dorsal): Implications for the Middle Eocene Climatic Optimum (MECO) in the SW Neo-Tethys
dc.contributor.departmentThe Ali I. Al-Naimi Petroleum Engineering Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
dc.identifier.journalPalaeogeography, Palaeoclimatology, Palaeoecology
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionDepartment of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, DK-1350, Copenhagen C., Denmark
dc.contributor.institutionSfax National Engineering School, PB 1178, Soukra Road km 4, Sfax 3038, Tunisia. University of Sfax, Road of the Airport km 0.5
dc.contributor.institutionInstitute of Earth Sciences (ISTE), University of Lausanne, Geopolis, CH-1015 Lausanne, Switzerland
dc.contributor.institutionInstitute of Earth Surface Dynamics (IDYST), University of Lausanne, Geopolis, CH-1015 Lausanne, Switzerland
dc.contributor.institutionMarine Geology Department, Faculty of Marine Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
dc.contributor.institutionLaboratory of Sediment Dynamics and Environment, Sfax National School of Engineers, PB 1173, 3038, Univ. of Sfax, Tunisia
kaust.personMessaoud, Jihede Haj

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