Provenance and pathways of late Quaternary turbidites in the deep-water Agadir Basin, northwest African margin

Michael Frenz, Russell B. Wynn, Aggeliki Georgiopoulou, Vera B. Bender, Gayle Hough, Douglas G. Masson, Peter J. Talling, Bryan T. Cronin

Research output: Contribution to journalArticle

Abstract

A series of individual turbidites, correlated over distances >100 km, are present in the recent fill of the Agadir Basin, offshore northwest Africa. The aim here is to unravel multiple turbidite source areas and flow pathways, and show how turbidite provenance studies contribute to interpretation of flow processes. Agadir Basin turbidites are sourced from four main areas, with the majority originating from the siliciclastic Morocco Shelf; their sand-mud distribution is strongly controlled by flow sediment volume, with relatively low-volume flows dying out within the Agadir Basin and large-volume flows bypassing significant sediment volumes to basins further downslope. Two large-volume volcaniclastic turbidites are attributed to a Canary Islands landslide source, while several small mud-dominated turbidites are interpreted to be locally sourced from hemipelagic-draped seamounts (e.g. Turbidite AB10). Finally, Turbidite AB1 (μ1 ka) is only present in the western Agadir Basin, and is linked to recent "re-activation" of the Sahara Slide headwall. The muddy suspension clouds of three large-volume flows, all linked to large-scale landslides, have covered huge areas of seafloor and flowed along or even slightly upslope for long distances. It is proposed that northeastwards-flowing bottom currents have aided transport of these dilute flow fractions into and across the Agadir Basin.

Original languageEnglish
Pages (from-to)721-733
Number of pages13
JournalInternational Journal of Earth Sciences
Volume98
Issue number4
DOIs
Publication statusPublished - 1 Jan 2009

Keywords

  • Agadir Basin
  • Canary Islands
  • Morocco Shelf
  • Sediment provenance
  • Turbidites

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