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• W3155266541 abstract "The Aptian-Early Albian interval of the southern Tethyan margin is poorly understood since sedimentary successions are frequently incomplete and dating is difficult. The Essaouira-Agadir Basin (EAB), Morocco, presents numerous, very good and accessible outcrops of the Early Cretaceous series. The aim of this work is to (1) establish an integrated stratigraphic framework of the Aptian-Albian series based on (a) high-resolution ammonites and calcareous nannofossil biostratigraphy, (b) identification of sedimentary discontinuities and (c) carbon isotope stratigraphy; (2) reconstruct the paleoenvironmental evolution during this interval through both sedimentary facies evolution and qualitative and quantitative nannofossil analyses, and (3) propose a functioning model for the sedimentation on the mixed, carbonate/clastic ramp of the EAB.In the EAB, the Late Barremian is defined by the sarasini ammonite zone and the NC5 nannofossil zone. The Barremian/Aptian boundary is defined by ammonites. The Early Aptian is defined by the deshayesi to furcata ammonite zones, and is bounded by a first minimum 13C value at the base and a first maximum value at the Early/Late Aptian Boundary. The Late Aptian interval, is defined by four ammonite zones (martini, melchioris, nolani and jacobi), two discontinuity surfaces, four maximum and minimum 13C values, and by the upper part of the NC6, the NC7 and the lowermost part of the NC8 nannofossil zones. The Aptian/Albian boundary is placed within the discontinuity D4 (base of the Leymeriella tardefurcata ammonite zone), supported by the First Occurrence (FO) of the Prediscosphaera columnata and Hayesites albiensis nannofossil taxa, and by decreasing 13C values. Early Albian times are represented by the tardefurcata and mammillatum ammonite zones, the FO of Hayesites albiensis, and by minimum 13C values.The facies and depositional environments of the Aptian-Early Albian rocks are identified based on their lithology, sedimentary structures, fossil content and microfacies. These allowed to identify (1) four types of key surfaces related subaerial or submarine erosion, (2) four sedimentary carbonated facies in the Aptian corresponding to outer to inner ramp depositional environments, and (3) four Early Albian sedimentary facies, represented by sandstones and shales, of basin to middle ramp depositional setting. These facies reflect deposition in adjacent and gradational paleoenvironments. The Aptian-Early Albian stratigraphic interval of the EAB, has been subdivided into two major cycles, floored by two major erosional surfaces. The latest Barremian-Aptian cycle is underlined by a major karstified-erosional surface and consists of four third-order depositional sequences. The Early Albian cycle, overlies a major submarine erosional surface, and also contains four depositional sequences. In each cycle, the vertical changes in facies indicates a deepening upward trend related to sea level rise.The carbonate production in the EAB is higher in the Aptian than during the Early Albian, due to warm conditions, slow rise of sea level, shallow depth of the basin, and little detrital influx. The nannofossil total absolute abundance decreases from the Aptian to the Early Albian, due to increasing sedimentation rate, associated with rapid subsidence. The nutrient input, fertility and calcareous nannofossil primary productivity is higher in the Early Albian with respect to the Aptian, and are mainly controlled by rising sea level and upwelling currents. The Latest Aptian-Early Albian period is characterized by a high abundance of cold taxa, and the migration of cosmopolitan biota from Boreal realm into the Tethyan realm, which may reflect the occurrence of a glacial climatic event." @default.
• W3155266541 created "2021-04-26" @default.
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• W3155266541 date "2016-10-04" @default.
• W3155266541 modified "2023-09-23" @default.
• W3155266541 title "THE APTIAN-ALBIAN TRANSGRESSION IN THE AGADIR-ESSAOUIRA BASIN, WESTERN MOROCCO" @default.
• W3155266541 hasPublicationYear "2016" @default.
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