Michel, Julien; Westphal, Hildegard; Hanebuth, Till J J (2009): (Table 1) Silt grain-size analysis of sediment surface samples in the Golfe d'Arguin. PANGAEA, https://doi.org/10.1594/PANGAEA.746830, Supplement to: Michel, J et al. (2009): Sediment partitioning and winnowing in a mixed eolian-marine system (Mauritanian shelf). Geo-Marine Letters, 29(4), 221-232, https://doi.org/10.1007/s00367-009-0136-8
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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.
Median Latitude: 20.109832 * Median Longitude: -17.321876 * South-bound Latitude: 19.661080 * West-bound Longitude: -17.800180 * North-bound Latitude: 20.815070 * East-bound Longitude: -16.954580
Date/Time Start: 2006-12-31T08:15:00 * Date/Time End: 2007-01-11T10:50:00
Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m
GeoB11502-1 (POS346_02-1) * Latitude: 19.670780 * Longitude: -16.966130 * Date/Time: 2006-12-31T08:15:00 * Elevation: -58.0 m * Location: off Mauritania * Campaign: POS346 (POS-346) * Basis: Poseidon * Method/Device: Giant box corer (GKG)
GeoB11503-1 (POS346_03-1) * Latitude: 19.684080 * Longitude: -16.985730 * Date/Time: 2006-12-31T09:25:00 * Elevation: -67.0 m * Location: off Mauritania * Campaign: POS346 (POS-346) * Basis: Poseidon * Method/Device: Giant box corer (GKG)
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).
|#||Name||Short Name||Unit||Principal Investigator||Method/Device||Comment|
|2||Latitude of event||Latitude|
|3||Longitude of event||Longitude|
|4||Elevation of event||Elevation||m|
|5||Sample ID||Sample ID||Michel, Julien|
|8||Mode, grain size||Mode||µm||Michel, Julien|
|9||Grain size, mean||Grain size mean||µm||Michel, Julien|
|10||Size fraction < 0.035 mm||<35 µm||%||Michel, Julien||Grain size, SEDIGRAPH 5100|
209 data points