Schmidt, Andrea (1999): Magnetic charachterization of surface sediments in the South Atlantic [dataset]. 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):
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):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Latitude of event | Latitude | ||||
| 2 | Longitude of event | Longitude | ||||
| 3 | Event label | Event | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | Magnetic susceptibility, volume | kappa | 10-6 SI | Schmidt, Andrea | Bartington MS2C coil sensor | |
| 6 | Susceptibility, specific | chi | 10-9 m3/kg | Schmidt, Andrea | Kappabridge | |
| 7 | Susceptibility, frequency dependence | kappa_fd | % | Schmidt, Andrea | Bartington MS2B bulk sensor | |
| 8 | ARM, Intensity, per unit volume | Inten (ARM) | mA/m | Schmidt, Andrea | ARM, 100 mT AF, 0.04 mT DF | |
| 9 | ARM, median destructive field of anhysteretic remanent magnetization | MDF (ARM) | mT | Schmidt, Andrea | ARM, 100 mT AF, 0.04 mT DF | |
| 10 | IRM, Intensity, per unit volume | Inten (IRM) | mA/m | Schmidt, Andrea | IRM, 800 mT DF | |
| 11 | ARM/IRM | ARM/IRM | Schmidt, Andrea | ARM, 100 mT AF, 0.04 mT DF | ||
| 12 | S-ratio (hematite/magnetite) | S-r | Schmidt, Andrea | SIRM 800 mT, Back field 300 mT | ||
| 13 | Hysteresis, saturation magnetization | Ms | mA m2/kg | Schmidt, Andrea | Hysteresis 1.4 T | |
| 14 | Hysteresis, saturation remanence | Mrs | mA m2/kg | Schmidt, Andrea | Hysteresis 1.4 T | |
| 15 | Hysteresis, coercive field | Bc | mT | Schmidt, Andrea | Hysteresis 0.3 T | |
| 16 | Hysteresis, remanent coercive field | Bcr | mT | Schmidt, Andrea | Hysteresis 0.3 T | |
| 17 | Hysteresis, saturation magnetization/ saturation remanence | Mrs/Ms | Schmidt, Andrea | Hysteresis 1.4 T | ||
| 18 | Hysteresis, Bcr/Bc | Bcr/Bc | Schmidt, Andrea | Hysteresis 0.3 T | ||
| 19 | Hysteresis, susceptibility, total specific | MSS | 10-9 m3/kg | Schmidt, Andrea | Hysteresis 1.4 T | |
| 20 | Hysteresis, susceptibility, specific, non-ferromagnetic | Msnf | 10-9 m3/kg | Schmidt, Andrea | Hysteresis 1.4 T | |
| 21 | Hysteresis, susceptibility, specific, ferromagnetic | Msf | 10-9 m3/kg | Schmidt, Andrea | Hysteresis 1.4 T |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3226 data points
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