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Stratigraphic evolution of a spectacularly exposed turbidite channel belt from the Tachrift System (late Tortonian, north‐East Morocco).

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Title: Stratigraphic evolution of a spectacularly exposed turbidite channel belt from the Tachrift System (late Tortonian, north‐East Morocco).
Authors: Reguzzi, Simone1 (AUTHOR), Marini, Mattia1 (AUTHOR) mattia.marini@unimi.it, Felletti, Fabrizio1 (AUTHOR), El Kati, Imad2 (AUTHOR), Zuffetti, Chiara1 (AUTHOR), Tabyaoui, Hassan2 (AUTHOR)
Source: Sedimentology. Jun2023, Vol. 70 Issue 4, p1075-1109. 35p.
Subjects: Turbidites, Architectural style, Imaging systems in seismology, Submarine fans, Levees, Neogene Period
Geographic Terms: Morocco
Abstract: The sedimentary architecture of channelized turbidites can be highly complex as it reflects the response of submarine channels to several interplaying factors. Although intensively investigated through seismic imaging, turbidite channel fills are not convincingly calibrated for sedimentary facies at a sub‐seismic scale. This contribution addresses the sedimentary architecture and the controls on the evolution of a ca 20 m thick channel‐levee complex of the Tachrift turbidite subunit (Upper Miocene, the Melloulou Formation), which accumulated along the southern slope of the Neogene Taza‐Guercif Basin (Rifian Corridor of north‐east Morocco). Facies and architectural analyses indicate that the studied channel‐levee complex is the result of three‐fold evolution. From base to top, it is comprised of: (i) a ca 7 m thick lower mud‐prone interval containing relatively small and vertically stacked channel fills with poorly developed muddy levees; (ii) a ca 4 m thick and >1 km wide sandstone‐rich middle interval made of lateral accretion packages that become progressively less amalgamated and fine‐grained and is overlain by ca 5 m of thin‐bedded mud‐rich turbidites intercalated with hemiplegic marlstones; and (iii) an up to ca 9 m thick upper interval constituted by aggradational channel fills with well‐developed levees and variously directed lateral accretion packages. This organization suggests that, following a phase of inception (lower interval), the channel underwent extensive meandering with very minor vertical aggradation, prior to being blanketed by 'retrogressive' muddy lobes (middle interval) during a phase of reduced sediment input. In turn, the uppermost interval records a late phase of channel re‐establishment and aggradation that likely terminated as a result of up‐dip avulsion. It is suggested that the observed change of architectural style reflected the feedback of changing sediment input, slope equilibrium profile and channel morphodynamics. [ABSTRACT FROM AUTHOR]
Copyright of Sedimentology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Stratigraphic evolution of a spectacularly exposed turbidite channel belt from the Tachrift System (late Tortonian, north‐East Morocco).
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  Data: <searchLink fieldCode="JN" term="%22Sedimentology%22">Sedimentology</searchLink>. Jun2023, Vol. 70 Issue 4, p1075-1109. 35p.
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  Data: <searchLink fieldCode="DE" term="%22Turbidites%22">Turbidites</searchLink><br /><searchLink fieldCode="DE" term="%22Architectural+style%22">Architectural style</searchLink><br /><searchLink fieldCode="DE" term="%22Imaging+systems+in+seismology%22">Imaging systems in seismology</searchLink><br /><searchLink fieldCode="DE" term="%22Submarine+fans%22">Submarine fans</searchLink><br /><searchLink fieldCode="DE" term="%22Levees%22">Levees</searchLink><br /><searchLink fieldCode="DE" term="%22Neogene+Period%22">Neogene Period</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Morocco%22">Morocco</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: The sedimentary architecture of channelized turbidites can be highly complex as it reflects the response of submarine channels to several interplaying factors. Although intensively investigated through seismic imaging, turbidite channel fills are not convincingly calibrated for sedimentary facies at a sub‐seismic scale. This contribution addresses the sedimentary architecture and the controls on the evolution of a ca 20 m thick channel‐levee complex of the Tachrift turbidite subunit (Upper Miocene, the Melloulou Formation), which accumulated along the southern slope of the Neogene Taza‐Guercif Basin (Rifian Corridor of north‐east Morocco). Facies and architectural analyses indicate that the studied channel‐levee complex is the result of three‐fold evolution. From base to top, it is comprised of: (i) a ca 7 m thick lower mud‐prone interval containing relatively small and vertically stacked channel fills with poorly developed muddy levees; (ii) a ca 4 m thick and >1 km wide sandstone‐rich middle interval made of lateral accretion packages that become progressively less amalgamated and fine‐grained and is overlain by ca 5 m of thin‐bedded mud‐rich turbidites intercalated with hemiplegic marlstones; and (iii) an up to ca 9 m thick upper interval constituted by aggradational channel fills with well‐developed levees and variously directed lateral accretion packages. This organization suggests that, following a phase of inception (lower interval), the channel underwent extensive meandering with very minor vertical aggradation, prior to being blanketed by 'retrogressive' muddy lobes (middle interval) during a phase of reduced sediment input. In turn, the uppermost interval records a late phase of channel re‐establishment and aggradation that likely terminated as a result of up‐dip avulsion. It is suggested that the observed change of architectural style reflected the feedback of changing sediment input, slope equilibrium profile and channel morphodynamics. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Sedimentology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1111/sed.13070
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 35
        StartPage: 1075
    Subjects:
      – SubjectFull: Turbidites
        Type: general
      – SubjectFull: Architectural style
        Type: general
      – SubjectFull: Imaging systems in seismology
        Type: general
      – SubjectFull: Submarine fans
        Type: general
      – SubjectFull: Levees
        Type: general
      – SubjectFull: Neogene Period
        Type: general
      – SubjectFull: Morocco
        Type: general
    Titles:
      – TitleFull: Stratigraphic evolution of a spectacularly exposed turbidite channel belt from the Tachrift System (late Tortonian, north‐East Morocco).
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            NameFull: Reguzzi, Simone
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            NameFull: Marini, Mattia
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            NameFull: Felletti, Fabrizio
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            NameFull: El Kati, Imad
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            NameFull: Zuffetti, Chiara
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            NameFull: Tabyaoui, Hassan
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            – D: 01
              M: 06
              Text: Jun2023
              Type: published
              Y: 2023
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