ESR 11 - Short term climatic events in icehouse periods and their effects on source to sink systems: the case examples of the Aptian events (OAE 1a et 1b) along the Tethyan Margin of Tunisia
- Researcher: Panagiotis Athanasios Giannenas
- Host institution: Université de Rennes 1
- Supervisors: Cécile Robin, François Guillocheau
Short-term climatic variations during icehouse periods had major effects on the dynamic of past oceans and related organicrich deep environments (OAE). Their effects on the whole sedimentary system, upstream of the continental slope, are poorly documented. The aim of our ESR project is to fill this gap through a study of the effect of two short-terms variations – the lower and upper Aptian events (OAE 1a et 1b) - from continental to deep-sea environments during two “long-term” climatically contrasted periods. The objectives are:
- to reconstruct the geometry of the sediments along the margin,
- to characterize and quantify the type of sediments (siliciclastic vs. in situ produced, grain-size for siliciclastics, clays types, weathering index..) from continental to marine environments,
- to define the different system tracts and
- to quantify the preservation differences (lithology, facies, volumes) between (i) the system tracts of a given short-term events and between (ii) similar system tracts of the two short events for understanding the effect of these contrasted climatic periods on the sedimentary record.
The used techniques are (1) facies sedimentology, (2) sequence stratigraphy, (3) clays mineralogy and (4) geochemistry. The studied margin is the Tethyan Margin of Tunisia.
- evolution of the depositional profiles,
- measurement of the sediment (siliciclastic, carbonate, evaporates) volumes,
- characterization of the type of clays and weathering index and
- understand and predict of the source to sink system for two short term climatic events in two long-term different climatic setting.
- Université Bourgogne FrancheComté (E. Vennin) - Carbonates and evaporites sedimentology (3 months)
- Halliburton (B. Griselle) – Field and global palaeoclimatic reconstructions (1 month)
- Université Bourgogne FrancheComté (P. Pellenard) - Clays analysis (3 months)