Application of Facies Associations, Integrated Prediction Error Filter Analysis, and Chemostratigraphy to the Organic-Rich and Siliceous Cenomanian-Turonian Sequence, Bargou Area, Tunisia: Integrated Sequence Stratigraphic Analysis
Figure 5
Stratigraphy, Mn and Sr/Ca ratio curves for the Cenomanian-Turonian transition of Culver, England [25] compared and correlated to the Ain Zakkar section (Bargou area, Tunisia). General trends in the Mn and Sr/Ca stratigraphy are indicated by solid grey curved lines. Note that Sr/Ca and Mn general trends are very similar to those in Culver section. Sr/Ca maxima span the shelf margin wedge (SMW) of the Fahden and lower part of the Bahloul Formations, with maximum values around sequence boundaries. Sr/Ca values fall through transgressive systems tracts (TST) and attain minimum values in the upper part of it. However, Mn exhibits important relationships to sequences but differently from Sr/Ca, with minima around sequence boundaries and through SMW, rising values from the TS through TST, maxima around maximum flooding surfaces, and normally decreasing through HST. (b) Comparison of the C/T transition Sr/Ca stratigraphy of England (Culver) and Italy (Gubbio) (Culver section data taken from [25, 26]; Gubbio data taken from [27]). The two sections are correlated using Sr/Ca events. Grey curves indicate the positions of Sr/Ca ratio maxima. Sequences are after Hardenbol et al. [28]. SB: sequence boundary; TS: transgressive surface; MFS: maximum flooding surface; HST: highstand systems tract; LST: low-stand systems tract; TST: transgressive systems tract.
