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<p>The development of a mixed carbonate–siliciclastic ramp system along the southern Tethyan margin can be clarified by examining the Aptian–Albian sequence of the Aurès Basin. An extensive cross-section was analysed to constrain the lithological architecture and microfacies distribution along the southern flank of Djebel El Azereg, the most prominent anticline of the area. Lithostratigraphic analysis allows the subdivision of the Aptian–Albian succession into three well-defined units: the Ich Moul Formation, the Dechera Baida Formation, and the Ackliath Azougar Formation. The studied succession is composed of laterally and vertically heterogeneous siliciclastic–carbonate deposits, reflecting the interplay between carbonate productivity and episodic terrigenous input under varying accommodation conditions. Petrographic analysis reveals a diverse suite of microfacies, characterised by significant variations in texture and in the relative abundance of skeletal and non-skeletal components. Thirteen microfacies are distinguished and organised into five facies associations, (1) siliciclastic microfacies, constituted by fine- to medium-grained sandstones; (2) siliciclastic–carbonate microfacies with packstone texture, composed mainly of quartz grains, ooids, bivalves, and orbitolinids; (3 and 4) carbonate microfacies with packstone and/or grainstone texture, dominated by ooids and peloids; and (4) wackestone to packstone microfacies, dominated by bivalves and echinoderms. These facies associations record depositional environments along a low-gradient homoclinal ramp, ranging from coastal and hybrid backshoal settings to carbonate shoals (inner and mid-ramp) and a proximal outer ramp domain. The spatial and vertical distribution of these facies associations provides insights into the internal organisation of the ramp (inner, middle and outer) and its stratigraphic evolution. These results highlight the complex dynamics of mixed carbonate–siliciclastic systems and contribute to a better understanding of Aptian–Albian platform development along the southern Tethyan margin.</p>

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Microfacies analysis and depositional model of a complex hybrid carbonate–siliciclastic ramp from the Aptian–Albian of the Central Aurès Basin (NE Algeria)

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Katia Aliane,
  • Sana Benmansour

摘要

The development of a mixed carbonate–siliciclastic ramp system along the southern Tethyan margin can be clarified by examining the Aptian–Albian sequence of the Aurès Basin. An extensive cross-section was analysed to constrain the lithological architecture and microfacies distribution along the southern flank of Djebel El Azereg, the most prominent anticline of the area. Lithostratigraphic analysis allows the subdivision of the Aptian–Albian succession into three well-defined units: the Ich Moul Formation, the Dechera Baida Formation, and the Ackliath Azougar Formation. The studied succession is composed of laterally and vertically heterogeneous siliciclastic–carbonate deposits, reflecting the interplay between carbonate productivity and episodic terrigenous input under varying accommodation conditions. Petrographic analysis reveals a diverse suite of microfacies, characterised by significant variations in texture and in the relative abundance of skeletal and non-skeletal components. Thirteen microfacies are distinguished and organised into five facies associations, (1) siliciclastic microfacies, constituted by fine- to medium-grained sandstones; (2) siliciclastic–carbonate microfacies with packstone texture, composed mainly of quartz grains, ooids, bivalves, and orbitolinids; (3 and 4) carbonate microfacies with packstone and/or grainstone texture, dominated by ooids and peloids; and (4) wackestone to packstone microfacies, dominated by bivalves and echinoderms. These facies associations record depositional environments along a low-gradient homoclinal ramp, ranging from coastal and hybrid backshoal settings to carbonate shoals (inner and mid-ramp) and a proximal outer ramp domain. The spatial and vertical distribution of these facies associations provides insights into the internal organisation of the ramp (inner, middle and outer) and its stratigraphic evolution. These results highlight the complex dynamics of mixed carbonate–siliciclastic systems and contribute to a better understanding of Aptian–Albian platform development along the southern Tethyan margin.