Holz, Christine; Stuut, Jan-Berend W; Henrich, Rüdiger (2004): Grain-size analysis of surface sediments, continental margin off NW Africa [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.207974, Supplement to: Holz, C et al. (2004): Terrigenous sedimentation processes along the continental margin off NW-Africa: implications from grain-size analysis of surface sediments. Sedimentology, 51, 1145-1154, https://doi.org/10.1111/j.1365-3091.2004.00665.x
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Published: 2004-10-12 • DOI registered: 2005-01-30
Abstract:
The terrigenous fraction of seabed sediments recovered along the north-west African continental margin illustrates spatial variability in grain size attributed to different transport mechanisms. Three subpopulations are determined from the grain-size analyses (n = 78) of the carbonate-free silt fraction applying an end-member modelling algorithm (G. J. Weltje, 1997). The two coarsest end-members are interpreted as representing aeolian dust, and the fine-grained end-member is related to fluvial supply. The end-member model thus allows aeolian fallout to be distinguished from fluvial-sourced mud in this area. The relative contributions of the end-members show distinct regional variations that can be related to different transport processes and pathways. Understanding present-day sediment dispersal and mixing is important for a better understanding of older sedimentary records and palaeoclimate reconstructions in the region.
Related to:
Holz, Christine (2005): Climate-induced variability of fluvial and aeolian sediment supply and gravity-driven sediment transport off Northwest Africa [dissertation]. Staats- und Universitätsbibliothek Bremen, Germany, urn:nbn:de:gbv:46-diss000012051
Project(s):
Coverage:
Median Latitude: 26.850711 * Median Longitude: -14.523492 * South-bound Latitude: 17.195000 * West-bound Longitude: -18.261700 * North-bound Latitude: 33.298300 * East-bound Longitude: -9.390000
Date/Time Start: 1982-01-22T00:00:00 * Date/Time End: 2001-04-12T11:11:00
Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m
Event(s):
GeoB4024-3 * Latitude: 27.678333 * Longitude: -13.431667 * Date/Time: 1996-02-04T00:00:00 * Elevation: -95.0 m * Recovery: 0.31 m * Campaign: VH96/1-3 * Basis: Victor Hensen * Method/Device: Giant box corer (GKG)
GeoB4025-2 * Latitude: 27.748333 * Longitude: -13.488333 * Date/Time: 1996-02-04T00:00:00 * Elevation: -504.0 m * Campaign: VH96/1-3 * Basis: Victor Hensen * Method/Device: Giant box corer (GKG) * Comment: no sample
GeoB4026-1 * Latitude: 27.808333 * Longitude: -13.543333 * Date/Time: 1996-02-04T00:00:00 * Elevation: -990.0 m * Recovery: 0.28 m * Campaign: VH96/1-3 * Basis: Victor Hensen * Method/Device: Giant box corer (GKG)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 6 | Sand | Sand | % | Holz, Christine | Grain size, sieving | |
| 7 | Silt | Silt | % | Holz, Christine | Atterberg settling tubes | |
| 8 | Size fraction < 0.002 mm, clay | <2 µm | % | Holz, Christine | Atterberg settling tubes | |
| 9 | End member | EM | % | Holz, Christine | Calculated | EM1 |
| 10 | End member | EM | % | Holz, Christine | Calculated | EM2 |
| 11 | End member | EM | % | Holz, Christine | Calculated | EM3 |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
519 data points