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Channel, dune and sand sheet architectures of strait-adjacent deltas, Rifian Corridor, Morocco

Channel, dune and sand sheet architectures of strait-adjacent deltas, Rifian Corridor, Morocco

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1144/SP523-2021-49. This is version 1 of this Preprint.

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Authors

Daan Beelen, Lesli Joy Wood, Mohamed Najib Zaghloul, Michiel Arts , Sebastian Cardona

Abstract

Sea strait geographies amplify tidal currents, which can result in the formation of tidal strait deposits with a symmetrical facies arrangement. It can be problematic to distinguish such confined tidal strait deposits from strait systems that developed in less constricted settings. To push a more robust differentiation between the confined tidal strait model and a model for less constricted tidal deposits, this study presents an example of a strait-adjacent delta and compares it to the existing model of confined tidal straits. The strait-adjacent delta interpretations are based on an exposed succession in Northern Morocco, that formed in the Miocene Rifian Corridor. The multi-km, seismic-scale exposures at the Ben Allou locality, formed in a region with a largely unconstrained coastline. Clayey and silty portions dominate the distal offshore and prodelta facies, while the proximal delta front and delta plain are comprised of carbonate-rich sandstones. These sandstones exhibit complex architectures of stacked channels and dunes in the delta front, and mud drape-bearing sand sheets on the delta plain. It is shown that the strait-adjacent delta model that is presented herein, is different from a confined tidal strait deposit as it has an asymmetric facies arrangement, and a basinward reduction in depositional energy.

DOI

https://doi.org/10.31223/X5B03N

Subjects

Earth Sciences, Geology, Sedimentology, Stratigraphy

Keywords

Delta, dune, tide-dominated delta, rifian corridor, tide-dominated, sand sheet, strait, tidal strait, strait adjacent delta, sedimentary architecturs

Dates

Published: 2021-06-17 11:26

License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None

Data Availability (Reason not available):
All data generated or analysed during this study are included in this published article