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

This is a Preprint and has not been peer reviewed. This is version 1 of this Preprint.

Downloads

Download Preprint

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 14:56

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

Add a Comment

You must log in to post a comment.


Comments

There are no comments or no comments have been made public for this article.