Internal Heterogeneity of the Spectacularly Exposed Deep-Marine Channel-Levee Complex 7 from the Tachrift Turbidite System of the Taza–Guercif Basin (Late Tortonian, NE Morocco)

In the context of subsurface modelling of deep-water sedimentary systems, it is crucial to confidently identify turbidite channel-levee architectural elements within ancient strata. This becomes particularly critical when working with subsurface data, such as borehole sections or seismic images. Similarly, in areas with limited outcrop exposure, establishing the temporal relationships of channel-levee systems predominantly relies on inference. Moreover, the paucity of well-documented outcrops exhibiting continuous sedimentary record between channel fill and overbank sediments remains a challenge.

This work presents the sedimentary architecture of channel-levee Complex 7, one of the late Tortonian channel-levee complexes constituting the Tachrift Turbidite System which records the infill of the Taza–Guercif Basin (NE Morocco). The basin constituted a part of an ancient seaway (the Rifian Corridor) connecting the paleo-Mediterranean Sea and the Atlantic Ocean. The objective of this study is to comprehensively document the geometry and vertical/lateral heterogeneity of facies assemblages within the northeastern portion of the Complex 7. This approach encompasses geological mapping, detailed facies analysis involving thirty-four logs, and the implementation of physical stratigraphic correlations. Facies associations and stratigraphic architecture of Complex 7 reveal an eastward channel belt migration and a subsequent increase in flow energy.

Thanks to exceptional 3D exposures, this study offers a detailed sedimentological characterization of channel fills and their corresponding levee deposits. It also provides valuable insights into the evolution of the parent channel, from its formation to its abandonment, while facilitating sub-seismic lithological calibration for subsurface analogs.