Middle Eocene to early Oligocene biostratigraphy in the SW Neo-Tethys (Tunisia): Large-scale correlations using calcareous nannofossil events and paleoceanographic implications

Messaoud, Jihede Haj; Thibault, Nicolas; Aljahdali, Mohammed H.; Yaich, Chokri

doi:10.1016/j.jafrearsci.2022.104805

Cited by 2 publications

(1 citation statement)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The present study focuses on two outcrop sections and one well data representing two sedimentary environments, including a protected inner ramp (Bougobrine section and Mcheguig well) and outer ramp mudstone (Souar section, Tunisian dorsal (Messaoud et al, 2021)). The biostratigraphy of the Souar and the Bougobrine sections were based on previous studies (Amami -Hamdi et al, 2014;Amami Hamdi and Ben Ismail Lattrache, 2013;Messaoud et al, 2023Messaoud et al, , 2021a. The Bougobrine section was logged and sampled in the northern Touila range (Fig.…”

Section: Stratigraphy and Geological Settingsmentioning

confidence: 99%

Geochemistry and cyclostratigraphy of homogeneous deposits using high-resolution hand-held X-ray Fluorescence: Outcrop to subsurface correlation, sequence stratigraphy, and constraints on hiatuses (middle-Upper Eocene, Tunisia)

Messaoud

2024

Preprint

View full text Add to dashboard Cite

This paper aims to determine the applicability of the handheld X-ray fluorescence (HH-XRF) for studying homogenous deposits, which finds essential applications in economic geology and paleoenvironmental studies. We tested using the HH-XRF in thick mudstone series to delineate the sequence stratigraphic framework and redox conditions in the deep-water section and for outcrop to well correlation in the shallow water deposits. Samples that exhibit maximum or minimum values for Si and Ti elements were chosen for the Inductively Coupled Plasma Mass Spectrometry (ICP-MS) analysis to help establish sequence boundaries. A comparison of HH-XRF and ICP-MS for measuring major and minor element concentrations was applied to validate the HH-XRF data. The data was normalized by Al and Ti to reveal the major trends. Si/Al and Si/Ti measurements have proven particularly useful for delignating sequences in homogeneous deep-water mudstones and cyclostratigraphy. Changes in Mo/Al, As/Al, V/Cr, V/(V + Ni) and isolated peaks in Sulphur during the Lutetian – Bartonian transition have been related to Maximum Flooding Surfaces (MFS) or Sequence Boundaries (SB). They are, therefore, associated with condensation or no deposition rather than a significant change in oxygenation conditions in the bottom waters of the outer ramp of our basin. Consequently, they do not truly reflect dysoxia but rather the peculiar chemical conditions associated with condensation.

show abstract

Section: Stratigraphy and Geological Settingsmentioning

confidence: 99%

Geochemistry and cyclostratigraphy of homogeneous deposits using high-resolution hand-held X-ray Fluorescence: Outcrop to subsurface correlation, sequence stratigraphy, and constraints on hiatuses (middle-Upper Eocene, Tunisia)

Messaoud

2024

Preprint

View full text Add to dashboard Cite

show abstract

High-resolution magnetic susceptibility as a proxy for sediment provenance change: age constraints on the Middle-Upper Eocene Atlasic event (central Tunisia)

Messaoud,

Yaich

2024

Preprint

Self Cite

View full text Add to dashboard Cite

Magnetic susceptibility (MS) and clay mineralogy data from the Bougobrine and Souar sections (Middle-Upper Eocene) in central Tunisia are compared to known sedimentological and geodynamic data to highlight the timing of the Paleogene sediment source change. Previous works placed the Alpine compression event and the folding in central Tunisia at the Middle-Upper Eocene transition, followed by a shift in the sediment source at the Eocene-Oligocene boundary. Here, we show that the primary origin of sediments followed the tectonic events, leading to a significant change in the magnetic signal and clay mineralogy since the topmost Bartonian in the proximal section and the base of the Priabonian in the distal section. The hematite, goethite, and magnetite concentrations determine the variations in the magnetic susceptibility signal of the distal homogenous shales (Souar section). The shallow carbonate Bougobrine section exhibits less pronounced cyclicity due to diagenesis, high dilution by carbonate, and scarce magnetic minerals (washed towards the distal shales). Adverse cyclostratigraphic findings in the distal section indicate that multiple sediment sources during the Middle Eocene led to the absence of preserved magnetic susceptibility cyclicity. Our results indicate multiple source regions of the Lutetian-Bartonian deposits from the emerged northern, eastern, and SE provinces and a more dominant eastern origin from the Early Priabonian with a minor contribution from the north and eastern regions. Large rivers occurred during the Eocene-Oligocene transition, bringing siliciclastic deposits from SW Tunisia in line with previously hypothesized provenance patterns.

show abstract

Middle Eocene to early Oligocene biostratigraphy in the SW Neo-Tethys (Tunisia): Large-scale correlations using calcareous nannofossil events and paleoceanographic implications

Cited by 2 publications

References 73 publications

Geochemistry and cyclostratigraphy of homogeneous deposits using high-resolution hand-held X-ray Fluorescence: Outcrop to subsurface correlation, sequence stratigraphy, and constraints on hiatuses (middle-Upper Eocene, Tunisia)

Geochemistry and cyclostratigraphy of homogeneous deposits using high-resolution hand-held X-ray Fluorescence: Outcrop to subsurface correlation, sequence stratigraphy, and constraints on hiatuses (middle-Upper Eocene, Tunisia)

High-resolution magnetic susceptibility as a proxy for sediment provenance change: age constraints on the Middle-Upper Eocene Atlasic event (central Tunisia)

Contact Info

Product

Resources

About