Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 49153 10.2205/2021ES000768 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Upper Miocene deposits from El Ma Labiod (T´ebessa, Northeastern Algeria): Sedimentology, micropaleontology and paleoenvironmental implications Upper Miocene deposits from El Ma Labiod (T´ebessa, Northeastern Algeria): Sedimentology, micropaleontology and paleoenvironmental implications Benkhedda Abdelhakim Benkhedda Abdelhakim Defaflia Nabil Defaflia Nabil Cherif Amine Cherif Amine Benzina Mostapha Benzina Mostapha Kechiched Rabah Kechiched Rabah Nadir Mohammed Nadir Mohammed Djerrab-Ruault Muriel Djerrab-Ruault Muriel Laboratory of Sedimentary Environment, Mineral and Hydric Resources of Algeria Eastern, Department of Earth and Universe Sciences, Larbi Tebessi University Алжир Laboratory of Sedimentary Environment, Mineral and Hydric Resources of Algeria Eastern, Department of Earth and Universe Sciences, Larbi Tebessi University Algeria Laboratory of Sedimentary Environment, Mineral and Hydric Resources of Algeria Eastern, Department of Earth and Universe Sciences, Larbi Tebessi University Алжир Laboratory of Sedimentary Environment, Mineral and Hydric Resources of Algeria Eastern, Department of Earth and Universe Sciences, Larbi Tebessi University Algeria Department of Sciences of the Earth and the Universe, University of Ouargla Алжир Department of Sciences of the Earth and the Universe, University of Ouargla Algeria Laboratoy of Research no 25 “PRHPM-LECT”, University of Tlemcen Алжир Laboratoy of Research no 25 “PRHPM-LECT”, University of Tlemcen Algeria Laboratoire des Reservoirs Souterrains: Petroliers, Gaziers et Aquiferes, Universite de Ouargla Алжир Laboratoire des Reservoirs Souterrains: Petroliers, Gaziers et Aquiferes, Universite de Ouargla Algeria Department of Sciences of the Earth and the Universe, University of Ouargla Алжир Department of Sciences of the Earth and the Universe, University of Ouargla Algeria Faculty of Nature and Life Sciences and Sciences of the Earth and the Universe, University of 08 May 1945 Алжир Faculty of Nature and Life Sciences and Sciences of the Earth and the Universe, University of 08 May 1945 Algeria 01 03 2022 01 03 2022 22 1 1 13 28 06 2020 01 03 2021 https://rjes.ru/en/nauka/article/49153/view

The Miocene sediments have been the subject of several studies over the Mediterranean region especially from a bio-lithostratigraphic and geodynamic studies point of views. The Miocene deposits of the El-Ma Labiod located in T´ebessa region (Northeastern Algeria) were investigated through the present research. This region is an area that was not extensively studied, and the available findings remain debatable. This study is conducted to clarify paleoenvironment conditions on the basis of a sedimentological approach including grain size, morphoscopy examination, and mineralogical analysis by XRD on the one hand, and by investigating the fauna contents on the other hand. The results reveal that Miocene sediments can display multiple modes of transport according to grain size. The XRD analyses on the clayey fraction have evidenced the presence of three clay minerals groups, mainly consisting of Kaolin-serpentine (kaolinite), minor smectite (Di-smectite), and sepiolite-plagorsikite (sepiolite) reflecting wholly warmer climate while the dominance of kaolinite indicates rather wet paleoclimate exposure. This study reports for the first time, a record of foraminifera and ostracods contents in the upper Miocene from the studied area. Based on these sedimentological and micropaleontological data, the Miocene deposits are more likely linked to a marginallittoral depositional environment.

The Miocene sediments have been the subject of several studies over the Mediterranean region especially from a bio-lithostratigraphic and geodynamic studies point of views. The Miocene deposits of the El-Ma Labiod located in T´ebessa region (Northeastern Algeria) were investigated through the present research. This region is an area that was not extensively studied, and the available findings remain debatable. This study is conducted to clarify paleoenvironment conditions on the basis of a sedimentological approach including grain size, morphoscopy examination, and mineralogical analysis by XRD on the one hand, and by investigating the fauna contents on the other hand. The results reveal that Miocene sediments can display multiple modes of transport according to grain size. The XRD analyses on the clayey fraction have evidenced the presence of three clay minerals groups, mainly consisting of Kaolin-serpentine (kaolinite), minor smectite (Di-smectite), and sepiolite-plagorsikite (sepiolite) reflecting wholly warmer climate while the dominance of kaolinite indicates rather wet paleoclimate exposure. This study reports for the first time, a record of foraminifera and ostracods contents in the upper Miocene from the studied area. Based on these sedimentological and micropaleontological data, the Miocene deposits are more likely linked to a marginallittoral depositional environment.

 Sedimentology; microfauna; marginal-littoral; Miocene; Tebessa; Northeastern Algeria We thank Pr. Tuna Eren (I˙zmir Katip C¸ elebi University, Petroleum and Natural Gas Engineering, I˙zmir/Turkey) for the English editing.

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