Upper Devonian “griottes” facies of the Ben-Zireg area (Bechar Basin, southwestern Algeria): Stratigraphy, microfacies analysis and paleo-environmental reconstruction - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of African Earth Sciences Année : 2022

Upper Devonian “griottes” facies of the Ben-Zireg area (Bechar Basin, southwestern Algeria): Stratigraphy, microfacies analysis and paleo-environmental reconstruction

Résumé

The widespread 'griotte' facies of the Late Devonian (Frasnian to Famennian) in the Ben-Zireg area of the Bechar basin (Southwestern Algeria) is described here from three sections (BZI, BZII and BZIII) which have been sampled bed-by-bed from the 'Griotte' limestone of the Ben-Zireg Formation. Based on macro-and microfacies analysis, this formation has been divided into three members: the Lower Member consists of 'griotte' limestone, the Median Member consists of clayey-limestone 'griotte', and (iii) the Upper Member consists of shales with intercalations of 'griotte' limestone. The ammonoid specimens recolted in this formation allow to characterize three Late Devonian biozones: the Cheiloceras Zone (UD II) of the Early Famennian, the Gonioclymenia (UD V) and the Kalloclymenia (UD VI) zones of the Late Famennian. Based on the field observations and the analysis of 270 thin sections, six microfacies types (MFT-1 to MFT-6) have been identified. They are dominated by biomicritic wackestones and mudstones characterizing a quiet marine environment corresponding to a distal ramp with deposits containing tempestites echoes and internalites fine grained supplies.
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hal-04412208 , version 1 (23-01-2024)

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Paternité - Pas d'utilisation commerciale

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Abdelkader Abbache, Abdelkader Ouali Mehadji, Ninon Allaire, Claude Monnet, Catherine Crônier, et al.. Upper Devonian “griottes” facies of the Ben-Zireg area (Bechar Basin, southwestern Algeria): Stratigraphy, microfacies analysis and paleo-environmental reconstruction. Journal of African Earth Sciences, 2022, 196, pp.104730. ⟨10.1016/j.jafrearsci.2022.104730⟩. ⟨hal-04412208⟩
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