Unattached carbonate platform evolution across the Aptian-Albian boundary: facies, magnetic susceptibility and sequence stratigraphy in the Constantine area of northeast Algeria
Laziz, O.; Boulvain, F.; Benabbas, C.; Marmi, R.; Benkherouf, F.; Abdelouahab, D.A. (2022). Unattached carbonate platform evolution across the Aptian-Albian boundary: facies, magnetic susceptibility and sequence stratigraphy in the Constantine area of northeast Algeria. Facies 68(4): 17. https://dx.doi.org/10.1007/s10347-022-00656-1 In: Facies. Springer: Heidelberg; Berlin. ISSN 0172-9179; e-ISSN 1612-4820, more |  |
| Keyword | | | Author keywords | Constantinois platform; Aptian-Albian; Palaeoenvironments; Facies; Sequences |
| Authors | | Top | - Laziz, O.
- Boulvain, F., more
- Benabbas, C.
| - Marmi, R.
- Benkherouf, F.
- Abdelouahab, D.A.
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| Abstract | Aptian–Albian palaeoenvironments explored in four sections on the Constantine platform, NE Algeria, are identified based on lithology, sedimentary structures, fossil content and microfacies. A mixed unattached carbonate platform is characterised by lagoonal–reefal facies during the Aptian and clastic–carbonate hemipelagic facies during the Albian. The vertical microfacies trend shows a large-scale deepening, locally interrupted by shallowing-upward sequences, especially during the Lower Aptian. Magnetic susceptibility oscillations recorded in the studied sections reflect several factors which influenced the magnetic signal including platform morphology, sedimentary discontinuities, detrital input and sedimentary condensation events. Three major depositional sequences are distinguished and overall indicate a deepening-up trend that generally coincides with the long-term sea-level rise recorded in Cretaceous strata at this time. The correlations between the studied sections demonstrate uplift of the platform and tilting from north to the south during at least the later part of the upper Aptian. Lithostratigraphic correlations and palaeontological assemblages across the Constantinois platform show that the structural units already mapped as overlapping bodies correspond to Albian strata. |
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