(Table 1) Silt grain-size analysis of sediment surface samples in the Golfe d'Arguin, supplement to: Michel, Julien; Westphal, Hildegard; Hanebuth, Till J J (2009): Sediment partitioning and winnowing in a mixed eolian-marine system (Mauritanian shelf). Geo-Marine Letters, 29(4), 221-232

DOI

Continental shelf systems are highly dynamic sedimentary environments, where sediments from biogenic production as well as from terrigenous sources are redistributed in the shelf depositional system, and partly exported off the shelf to the slope and the deep sea. The Golfe d'Arguin (Mauritania, NW Africa) is dominated by such redistribution processes, involving clastic silt imported as dust from the Sahara desert and biogenic carbonates of marine origin. Indeed, surface-sediment grain size and mineralogy show a clear north-south partitioning of sediment type. Fine material is winnowed from the northern part of the gulf, and transported toward the southern part off the Banc d'Arguin, where coarse silt settles on the outer shelf and upper slope, at least down to 600 m water depth. Particles of the fine silt fraction, estimated in terms of eolian material collected aboard the research vessel, are thought to be exported further offshore as they correspond to grain sizes previously reported from adjacent deep-sea sediments. These findings suggest that the interpretation of dust records from the continental slope and rise off NW Africa must consider reworking and partitioning processes active on the Mauritanian shelf.

The asterisk identifies those samples selected for assessment of modal silt grain size along the transect of shallow samples (<50 mwd, n=21; cf. main text and Fig. 5).

Identifier
DOI https://doi.org/10.1594/PANGAEA.746830
Related Identifier https://doi.org/10.1007/s00367-009-0136-8
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.746830
Provenance
Creator Michel, Julien; Westphal, Hildegard; Hanebuth, Till J J
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2009
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 209 data points
Discipline Earth System Research
Spatial Coverage (-17.800W, 19.661S, -16.955E, 20.815N); off Mauritania; Mauritanian shelf
Temporal Coverage Begin 2006-12-31T08:15:00Z
Temporal Coverage End 2007-01-11T10:50:00Z