Application of the Time Series Analysis to the Latest Cenomanian -Early Turonian Sequence Using Foraminifera in the Southern Tethyan Margin

Soua, Mohamed (ETAP) | Smaoui, Jalel (Faculté des Sciences de Tunis) | Zaghbib-Turki, Dalila


Time series analysis has been performed for the first time on the Cenomanian-Turonian sequence in Central Tunisia in order to shed light on its Milankovitch-like cyclicity. This analysis was tested and applied on two foraminiferal species: the biserial Heterohelix, an oxygen minimum zone (OMZ) dweller, and the triserial Guembelitria, a eutrophic surface dweller. Average sedimentary rates and the duration of the second Oceanic Anoxic Event OAE-2 in each studied section were estimated. Alternatively, the fluctuations of these two opportunistic species can be related mainly to both precessional (23-19 ka) and eccentricity (414-106 ka) cyclicity suggesting that changes in surface water fertility were linked to the Milankovitch parameters.

Keywords: Time series analysis; Heterohelix spp; Guembelitria spp; Milankovitch cyclicity; cyclostratigraphy; Cenomanian-Turonian boundary.