The Paleocene in northern and central-eastern Tunisia: systematics and biostratigraphy of Foraminifera and depositional environments.
The foraminiferous wealth of the deposits of the Maastrichtian-Ypresian interval, in the northern and central-northern regions of Tunisia, has made it possible to date the series of this interval and of certain sedimentary hiatus. Thus, the Tertiary-Cretaceous, Eocene-Paleocene boundaries were well...
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| Other Authors: | , , |
| Format: | Doctoral or Postdoctoral Thesis |
| Language: | French |
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HAL CCSD
1999
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| Subjects: | |
| Online Access: | https://tel.archives-ouvertes.fr/tel-03215378 https://tel.archives-ouvertes.fr/tel-03215378/document https://tel.archives-ouvertes.fr/tel-03215378/file/Doctorat%20%20Narjess%20Karoui%20Yaakoub.pdf |
| Summary: | The foraminiferous wealth of the deposits of the Maastrichtian-Ypresian interval, in the northern and central-northern regions of Tunisia, has made it possible to date the series of this interval and of certain sedimentary hiatus. Thus, the Tertiary-Cretaceous, Eocene-Paleocene boundaries were well defined and lateral variations and sedimentary gaps were highlighted. Thus, the richness and the good preservation of planktonic foraminifera, made it possible to identify the different biozones throughout this intervalThe statistical study of planktonic and benthic foraminifera revealed the biological crisis of the Cretaceous-Tertiary boundary. Also, this crisis has been proven by the geochemical analysis of the sediments of the Cretaceous-Tertiary boundary, the presence of the Iridium is the main indicator of the global event.The discovery of the red level, rich in Ir in the Ellès and Oued El Melah sections, is the most important contribution to this research work and proof, that apart from, the global stratotype of the KT boundary recognized at Kef, there are two other regions in northern Tunisia which recorded the event.The Paleocene-Eocene boundary has also been recognized in these regions, and planktonic and benthic foraminifers have been marked by global warming. La richesse en foraminifères des dépôts de l’intervalle Maastrichtien- Yprésien, dans les régions septentrionales et centro-septentrionales de la Tunisie, a permis de bien dater les séries de cet intervalle et de certains hiatus sédimentaires. Ainsi les limites Crétacé-Tertiaire, Paléocène-Eocène ont été bien définies et les variations latérales et les lacunes sédimentaires ont été mises en évidence.Grâce à la richesse et à la bonne préservation des foraminifères planctoniques, les différentes biozones ont été bien reconnues tout le long de cet intervalle. L’étude statistique des foraminifères planctoniques et benthiques, a permis de mettre en évidence la crise biologique de la limite Crétacé-Tertiaire. Également, cette crise a été prouvée par ... |
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