Storm-dominated shallow-marine carbonates of the lower Eocene succession of the northwestern Tunisian domain
| Autor: | Fehmy Belghouthi, Hédi Zouari |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Geochemistry Geology Sedimentary basin 010502 geochemistry & geophysics 01 natural sciences Conglomerate Sedimentary structures Calcarenite Sedimentary depositional environment chemistry.chemical_compound chemistry Marl Facies Carbonate 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Journal of African Earth Sciences. 160:103608 |
| ISSN: | 1464-343X |
| DOI: | 10.1016/j.jafrearsci.2019.103608 |
| Popis: | The lower Eocene carbonate deposits of the northwestern Tunisian basin is represented by shallow-marine carbonate series composed of abundant coarse-grained deposits including conglomerate, coquina-bearing limestone, coarse-grained calcarenite and glauconite-rich marl, interbedded within a fine-grained limestone and marl succession. Sediment composition, sedimentary structures, and spatial geometry of beds allow us to interpret such deposits as generated by storm while lateral transport was performed by both storm-induced currents and gravity-driven currents. Gravity-driven coarse-grained deposits were generated in slope caused by NE-SW major faults and accumulated in the base of slope in the form of complex submarine bars and banks. The significant activity of gravity-driven currents in storm-controlled environments is interpreted as resulted from irregular seafloor paleotopography generated by these faults. Thickness and facies correlation suggests that the depositional basin was structured into shallow submarine highs adjacent to the NE-SW faults and relatively-deep subsiding depocenters extending beyond these faults. The lower Eocene deposits are interpreted as deposited in tectonically-controlled sedimentary basins strongly controlled by intermittent storm activities. |
| Databáze: | OpenAIRE |
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