Fault-controlled stratigraphy of the Late Cretaceous Abiod Formation at Ain Medheker (Northeast Tunisia) |
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| Institution: | 1. Universität Bremen – FB 5, P.O. Box 330440, D-28355 Bremen, Germany;2. Universite Tunis El Manar II, Faculté des Sciences de Tunis, UR Pétrologie sédimentaire et cristalline, Tunisia;3. Universita di Milano, Dipartimento di Scienze della Terra, Milan, Italy;4. University of Paris VI, CNRS UMR 7207 “Centre de recherche sur la paleobiodiversie et les paleoenvironments – CR2P”, case 104, Paris, France;1. Department of Earth Science and Engineering, Royal School of Mines, Imperial College London, London SW7 2BP, United Kingdom;2. British Geological Survey, Murchison House, Edinburgh, EH9 3LA,, United Kingdom;1. State Key Laboratory of Disaster Reduction in Civil Engineering and College of Civil Engineering, Tongji University, Shanghai 200092, China;2. State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China;3. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China;4. Department of Engineering Technology, University of North Texas, Denton 76207, USA |
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| Abstract: | The palaeogeographic setting of the studied Ain Medheker section represents an Early Campanian to Early Maastrichtian moderately deep carbonate shelf to distal ramp position with high rates of hemipelagic carbonate production, periodically triggered by mass-flow processes. Syndepositional extensional tectonic processes are confirmed to the Early Campanian. Planktonic foraminifera identified in thin sections and calcareous nannofossils allow the identification of the following biozones: Globotruncanita elevata, Contusotruncana plummerae (replacing former Globotruncana ventricosa Zone), Radotruncana calcarata, Globotruncana falsostuarti, and Gansserina gansseri. The following stable C-isotope events were identified: the Santonian/Campanian boundary Event, the Mid-Campanian Event, and the Late Campanian Event. Together with further four minor isotopic events, they allow for correlation between the western and eastern realms of Tunisia. Frequently occurring turbidites were studied in detail and discussed in comparison with contourites. |
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