Late Cretaceous-Paleogene Formation of the Bekrit Syncline, Middle Atlas, Morocco: Sedimentology, Geochemistry, Palynology and Paleoenvironments  

作　　者：Mohammed El Attmani Amine Bouwafoud Salem Elouariti Hicham Si Mhamdi Abdelmajid Ben Bouziane Mustapha Mouflih Mohammed El Attmani;Amine Bouwafoud;Salem Elouariti;Hicham Si Mhamdi;Abdelmajid Ben Bouziane;Mustapha Mouflih(Sedimentary Basins Dynamic and Geological Correlations Laboratory, Department of Geology, Faculty of Science Ben M’sik, Hassan II University of Casablanca, Casablanca, Morocco;Laboratory of Applied Geology, Department of Geosciences, Faculty of Sciences and Techniques Errachidia, Moulay Ismaïl University of Meknes, Meknes, Morocco)

机构地区：[1]Sedimentary Basins Dynamic and Geological Correlations Laboratory, Department of Geology, Faculty of Science Ben M’sik, Hassan II University of Casablanca, Casablanca, Morocco [2]Laboratory of Applied Geology, Department of Geosciences, Faculty of Sciences and Techniques Errachidia, Moulay Ismaï l University of Meknes, Meknes, Morocco

出　　处：《Open Journal of Geology》2021年第3期61-80,共20页地质学期刊（英文）

摘　　要：Globally, the Paleogene period experienced several events marking the Paleocene-Eocene transition which is especially to one of the hottest periods that the Earth has ever known (Paleocene-Eocene Thermal Maximum, PETM), followed by the biological crisis that affected benthic foraminifera. The Bekrit Syncline, subject of this study, shows three Formations of range from the Cretaceous to the Eocene ages (the El Koubbat, Irbzer and Bekrit-Timahdite Formations). Sedimentological, palynological and geochemical analyses of collected samples, in the Bekrit syncline, were studied to determine the paleogeographic and paleoenvironmental conditions of the Middle Atlas. The carbonate rocks were analyzed by microscopic study and geochemical analysis by X-ray Fluorescence (XF) and Inductively Coupled Plasma Spectrometry (ICP). The results obtained highlight the sedimentary events that took place during the Paleogene. Thus, the Maastrichtian is characterized by a closed euxinic marine environment shared by a more open and oxidizing environment. On the other hand, the Paleocene was a restricted marine environment with evaporitic sedimentation, while the Eocene sees the installation of a carbonate platform with a bioclastic Shoal.Globally, the Paleogene period experienced several events marking the Paleocene-Eocene transition which is especially to one of the hottest periods that the Earth has ever known (Paleocene-Eocene Thermal Maximum, PETM), followed by the biological crisis that affected benthic foraminifera. The Bekrit Syncline, subject of this study, shows three Formations of range from the Cretaceous to the Eocene ages (the El Koubbat, Irbzer and Bekrit-Timahdite Formations). Sedimentological, palynological and geochemical analyses of collected samples, in the Bekrit syncline, were studied to determine the paleogeographic and paleoenvironmental conditions of the Middle Atlas. The carbonate rocks were analyzed by microscopic study and geochemical analysis by X-ray Fluorescence (XF) and Inductively Coupled Plasma Spectrometry (ICP). The results obtained highlight the sedimentary events that took place during the Paleogene. Thus, the Maastrichtian is characterized by a closed euxinic marine environment shared by a more open and oxidizing environment. On the other hand, the Paleocene was a restricted marine environment with evaporitic sedimentation, while the Eocene sees the installation of a carbonate platform with a bioclastic Shoal.

关 键 词：GEOCHEMISTRY SEDIMENTOLOGY PALYNOLOGY Carbonates Phosphate PALEOENVIRONMENTS Middle-Atlas 

分 类 号：P53[天文地球—古生物学与地层学]