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Schmidt, Andrea (1999): Magnetic charachterization of surface sediments in the South Atlantic. PANGAEA, https://doi.org/10.1594/PANGAEA.55291, Supplement to: Schmidt, Andrea; von Dobeneck, Tilo; Bleil, Ulrich (1999): Magnetic characterization of Holocene sedimentation in the South Atlantic. Paleoceanography, 14(4), 465-481, https://doi.org/10.1029/1999PA900020

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Abstract:
Surface sediment samples representative for the tropical and subtropical South Atlantic (15°N to 40°S) were investigated by isothermal magnetic methods to delineate magnetic mineral distribution patterns and to identify their predominant Holocene climatic and oceanographic controls. Individual parameters reveal distinct, yet frequently overlapping, regional sedimentation characteristics. A probabilistic ('fuzzy c-means') cluster analysis was applied to five concentration independent magnetic properties assessing magnetite to hematite ratios and diagnostic of bulk and fine-particle magnetite grain size and coercivity spectra. The resultant 10 cluster structures establish an oceanwide magnetic sediment classification scheme tracing the major terrigenous eolian and fluvial fluxes, authigenic biogenic magnetite accumulation in high-productivity areas, transport by ocean current systems, and effects of bottom water velocity on depositional regimes. Distinct dissimilarities in magnetic mineral inventories between the eastern and western basins of the South Atlantic reflect prominent contrasts of both oceanic and continental influences.
Related to:
Schmidt, Andrea (2001): Magnetic Mineral Fluxes in the Quaternary South Atlantic: Implications for the Paleoenvironment. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 175, 97 pp, urn:nbn:de:gbv:46-ep000103001
Project(s):
South Atlantic in Late Quaternary: Reconstruction of Budget and Currents (SFB261)
Coverage:
Median Latitude: -17.873506 * Median Longitude: -18.815799 * South-bound Latitude: -39.290000 * West-bound Longitude: -59.388333 * North-bound Latitude: 12.718333 * East-bound Longitude: 17.861667
Date/Time Start: 1988-02-20T00:00:00 * Date/Time End: 1996-04-14T00:00:00
Minimum Elevation: -5684.0 m * Maximum Elevation: -237.0 m
Event(s):
GeoB1005-2 * Latitude: -6.235450 * Longitude: 11.502183 * Date/Time: 1988-02-20T00:00:00 * Elevation: -237.0 m * Penetration: 0.55 m * Recovery: 0.52 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Ton, olivgrüngrau, Forams.
GeoB1009-3 * Latitude: -6.917650 * Longitude: 8.996717 * Date/Time: 1988-02-21T00:00:00 * Elevation: -4074.0 m * Penetration: 0.45 m * Recovery: 0.41 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Ton, braun-grüngrau
GeoB1010-3 * Latitude: -7.427600 * Longitude: 7.419617 * Date/Time: 1988-02-22T00:00:00 * Elevation: -4474.0 m * Penetration: 0.4 m * Recovery: 0.37 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Ton, hell-dunkelbr., lamin.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Latitude of eventLatitude
2Longitude of eventLongitude
3Event labelEvent
4Elevation of eventElevationm
5Susceptibility, volumekappa10-6 SISchmidt, AndreaBartington MS2C coil sensor
6Susceptibility, specificchi10-9 m3/kgSchmidt, AndreaKappabridge
7Susceptibility, frequency dependencekappa_fd%Schmidt, AndreaBartington MS2B bulk sensor
8ARM, Intensity, per unit volumeInten (ARM)mA/mSchmidt, AndreaARM, 100 mT AF, 0.04 mT DF
9ARM, median destructive field of anhysteretic remanent magnetisationMDF (ARM)mTSchmidt, AndreaARM, 100 mT AF, 0.04 mT DF
10IRM, Intensity, per unit volumeInten (IRM)mA/mSchmidt, AndreaIRM, 800 mT DF
11ARM/IRMARM/IRMSchmidt, AndreaARM, 100 mT AF, 0.04 mT DF
12S-ratio (hematite/magnetite)S-rSchmidt, AndreaSIRM 800 mT, Back field 300 mT
13Hysteresis, saturation magnetizationMsmA m2/kgSchmidt, AndreaHysteresis 1.4 T
14Hysteresis, saturation remanenceMrsmA m2/kgSchmidt, AndreaHysteresis 1.4 T
15Hysteresis, coercive fieldBcmTSchmidt, AndreaHysteresis 0.3 T
16Hysteresis, remanent coercive fieldBcrmTSchmidt, AndreaHysteresis 0.3 T
17Hysteresis, saturation magnetization/ saturation remanenceMrs/MsSchmidt, AndreaHysteresis 1.4 T
18Hysteresis, Bcr/BcBcr/BcSchmidt, AndreaHysteresis 0.3 T
19Hysteresis, susceptibility, total specificMSS10-9 m3/kgSchmidt, AndreaHysteresis 1.4 T
20Hysteresis, susceptibility, specific, non-ferromagneticMsnf10-9 m3/kgSchmidt, AndreaHysteresis 1.4 T
21Hysteresis, susceptibility, specific, ferromagneticMsf10-9 m3/kgSchmidt, AndreaHysteresis 1.4 T
Size:
3226 data points

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