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Kasten, Sabine; Glasby, Geoffrey P; Schulz, Horst D; Friedrich, Günther; Andreev, Sergey I (1998): Geochemistry of surface sediment cores (Table 4). PANGAEA,, Supplement to: Kasten, S et al. (1998): Rare earth elements in manganese nodules from the South Atlantic Ocean as indicators of oceanic bottom water flow. Marine Geology, 146(1-4), 33-52,

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The mineralogy and geochemistry of a suite of nine manganese nodules from the South Atlantic have been determined. The Ce/La ratios of the nodules were investigated to see if they could be used as redox indicators to trace the oxygen content of the ambient water mass and the flow path of the Antarctic Bottom Water as has previously been successfully carried out in the Pacific Ocean. The Ce/La ratios of the nodules decrease in the sequence Lazarev Sea, Weddell Sea (10.4 and 9.7)>East Georgia Basin (6.5 and 7.1)>Argentine Basin (5.0), but then increase in the Brazil Basin (6.2) and Angola Basin (9.8 and 15.1). A further decrease was observed in the Cape Basin (7.6). An extremely high Ce/La ratio of 24.4 had already been determined for nodules sampled north of the Nares Abyssal Plain in the western North Atlantic. These data reflect the more complicated pattern of bottom water flow in the South Atlantic than in the South Pacific. The penetration of more oxygenated North Atlantic Deep Water into the South Atlantic accounts for the higher Ce/La ratios in the nodules from the Angola and Brazil basins. Based on this study, the flow path of the Antarctic Bottom Water could only be traced as far north as the Argentine Basin. The unique geochemistry of nodules from the central Angola Basin (high Mn/Fe and Ce/La ratios, high contents of Ni, Cu, Zn and Mo) appears to be a function of the nature of the overlying water mass and of the multiple diagenetic sources of metals to the nodules.
Related to:
Kasten, Sabine (1996): Early diagenetic metal enrichments in marine sediments as documents of nonsteady-state depositional conditions. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 82, 118 pp, urn:nbn:de:gbv:46-ep000102114
Median Latitude: -38.064247 * Median Longitude: -15.777800 * South-bound Latitude: -65.173200 * West-bound Longitude: -41.431667 * North-bound Latitude: -8.916667 * East-bound Longitude: 10.291667
Date/Time Start: 1988-03-07T00:00:00 * Date/Time End: 1994-08-02T00:00:00
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 0.15 m
GeoB1037-2 * Latitude: -13.151667 * Longitude: 0.150000 * Date/Time: 1988-03-07T00:00:00 * Elevation: -5626.0 m * Penetration: 0.26 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Device: Giant box corer (GKG) * Comment: Tiefseeton, 2 Manganknollen
GeoB2010-1 * Latitude: -32.855000 * Longitude: 10.291667 * Date/Time: 1993-02-08T00:00:00 * Elevation: -5049.0 m * Recovery: 0.22 m * Location: Cape Basin * Campaign: M23/1 * Basis: Meteor (1986) * Device: Giant box corer (GKG) * Comment: Pelagic clay, Mn-nodules
GeoB2208-1 * Latitude: -8.916667 * Longitude: -33.700000 * Date/Time: 1993-03-23T00:00:00 * Elevation: -3977.0 m * Recovery: 0.32 m * Location: Brazil Basin * Campaign: M23/3 * Basis: Meteor (1986) * Device: MultiCorer (MUC) * Comment: core recovery 8/10, Mn nodules
#NameShort NameUnitPrincipal InvestigatorMethodComment
3Event labelEvent
4Elevation of eventElevationm
5DEPTH, sediment/rockDepthmGeocode
6ManganeseMn%Kasten, SabineHF/HNO3/H2O2 pressure digestion
7IronFe%Kasten, SabineHF/HNO3/H2O2 pressure digestion
8Manganese/Iron ratioMn/FeKasten, SabineCalculated
9AluminiumAl%Kasten, SabineHF/HNO3/H2O2 pressure digestion
10VanadiumVmg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
11ChromiumCrmg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
12CobaltComg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
13NickelNimg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
14CopperCumg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
15ZincZnmg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
16ArsenicAsmg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
17StrontiumSrmg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
18MolybdenumMomg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
19BariumBamg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
20LanthanumLamg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
21CeriumCemg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
22NeodymiumNdmg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
23SamariumSmmg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
24TerbiumTbmg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
25YtterbiumYbmg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
26LutetiumLumg/kgKasten, SabineHF/HNO3/H2O2 pressure digestion
27Cerium/Lanthanum ratioCe/LaKasten, SabineCalculated
220 data points

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