Abstract
Facies associations, integrated prediction error filter analysis (INPEFA) of spectral Gamma-ray data, Sr/Ca and Mn chemostratigraphy, and sequence stratigraphy of the organic-rich and siliceous Cenomanian-Turonian Bahloul formation have been studied in Bargou section, located in north-central Tunisia. The studied section is subdivided into seven facies evolving from platform to basin deposits. Based on basin geometry, facies distribution, spectral Gamma-ray INPEFA curves, Sr/Ca and Mn profiles patterns, and the sequence was also subdivided into shelf margin wedge (uppermost Fahden Formation-lowermost Bahloul), basal transgressive systems tract (remainder Bahloul Formation) and early high-stand systems tract (Kef Formation). The Sr/Ca ratios, Mn profile, sequence stratigraphic, and cyclostratigraphic interpretations reveal the existence of four transgressive parasequences deposited throughout 420 kyr within the organic rich and siliceous Bahloul facies.
Highlights
The evolution of the sedimentary basins, which are considered to be filled by successive depositional sequences has proved and justified the use of the application of sequence stratigraphy concepts
It must be understood that the Sr/Ca ratio values fall through the transgressive systems tracts (TST) intervals [25,26,27, 30, 39]
It must be understood that the applicability of the sequence stratigraphy models, essentially on carbonate setting, could elucidate the vertical evolution within depositional sequences and explain the facies associations within systems tracts in the context of sea-level changes
Summary
The evolution of the sedimentary basins, which are considered to be filled by successive depositional sequences has proved and justified the use of the application of sequence stratigraphy concepts. The burial history of the sedimentary basin is panoply of several related factors such as subsidence, local tectonics, eustatic fluctuations, carbonate production, climatic cyclicity, as well as chemical reactions issued from several factors (temperature, pressure, density, etc.). These depositional sequences are subdivided further into systems tracts and parasequences [1,2,3]. The aims of this paper are: (1) to present a revised stratigraphic description of the siliceous and organic-rich upper Cenomanian-lower Turonian in central Tunisia using facies association; (2) to apply new tools to sequence stratigraphy which consist of integrated prediction error filter analysis (INPEFA) of spectral Gamma-ray data
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