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Govin, Aline; Holzwarth, Ulrike; Heslop, David; Ford Keeling, Lara; Zabel, Matthias; Mulitza, Stefan; Collins, James A; Chiessi, Cristiano Mazur (2012): Modern major element concentrations and ratios measured in Atlantic surface sediments (36°N-49°S). PANGAEA, https://doi.org/10.1594/PANGAEA.763639, Supplement to: Govin, A et al. (2012): Distribution of major elements in Atlantic surface sediments (36°N–49°S): Imprint of terrigenous input and continental weathering. Geochemistry, Geophysics, Geosystems, 13(1), Q01013, https://doi.org/10.1029/2011gc003785

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Abstract:
Numerous studies use major element concentrations measured on continental margin sediments to reconstruct terrestrial climate variations. The choice and interpretation of climate proxies however differ from site to site. Here we map the concentrations of major elements (Ca, Fe, Al, Si, Ti, K) in Atlantic surface sediments (36°N-49°S) to assess the factors influencing the geochemistry of Atlantic hemipelagic sediments and the potential of elemental ratios to reconstruct different terrestrial climate regimes. High concentrations of terrigenous elements and low Ca concentrations along the African and South American margins reflect the dominance of terrigenous input in these regions. Single element concentrations and elemental ratios including Ca (e.g., Fe/Ca) are too sensitive to dilution effects (enhanced biological productivity, carbonate dissolution) to allow reliable reconstructions of terrestrial climate. Other elemental ratios reflect the composition of terrigenous material and mirror the climatic conditions within the continental catchment areas. The Atlantic distribution of Ti/Al supports its use as a proxy for eolian versus fluvial input in regions of dust deposition that are not affected by the input of mafic rock material. The spatial distributions of Al/Si and Fe/K reflect the relative input of intensively weathered material from humid regions versus slightly weathered particles from drier areas. High biogenic opal input however influences the Al/Si ratio. Fe/K is sensitive to the input of mafic material and the topography of Andean river drainage basins. Both ratios are suitable to reconstruct African and South American climatic zones characterized by different intensities of chemical weathering in well-understood environmental settings.
Coverage:
Median Latitude: -11.549302 * Median Longitude: -24.992331 * South-bound Latitude: -48.911667 * West-bound Longitude: -60.091667 * North-bound Latitude: 36.023500 * East-bound Longitude: 18.091167
Date/Time Start: 1991-04-16T00:00:00 * Date/Time End: 2005-07-20T13:59:00
Minimum DEPTH, sediment/rock: 0.0025 m * Maximum DEPTH, sediment/rock: 0.0150 m
Event(s):
GeoB1412-2 * Latitude: -15.670000 * Longitude: -7.758333 * Date/Time: 1991-04-16T00:00:00 * Elevation: -4342.0 m * Recovery: 0.05 m * Location: West Angola Basin * Campaign: M16/1 * Basis: Meteor (1986) * Device: MultiCorer (MUC) * Comment: Rohre: (2/6), (2/4); d13C BW
GeoB1501-2 * Latitude: -3.678330 * Longitude: -32.013333 * Date/Time: 1991-04-30T00:00:00 * Elevation: -4258.0 m * Recovery: 0.33 m * Location: Brazil Basin * Campaign: M16/2 * Basis: Meteor (1986) * Device: MultiCorer (MUC) * Comment: ohre: (6/6), (4/4); d13C B
GeoB1505-4 * Latitude: 2.278333 * Longitude: -33.006667 * Date/Time: 1991-05-03T00:00:00 * Elevation: -3703.0 m * Recovery: 0.31 m * Location: Brazil Basin * Campaign: M16/2 * Basis: Meteor (1986) * Device: MultiCorer (MUC) * Comment: Rohre: (6/6), (4/4); d13C BW
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepthmGeocode
6Depth, top/minDepth topmGovin, Aline
7Depth, bottom/maxDepth botmGovin, Aline
8AluminiumAlmg/kgGovin, AlineEnergy dispersive polarization X-ray fluorescence spectrometer (EDP-XRF)
9SiliconSimg/kgGovin, AlineEnergy dispersive polarization X-ray fluorescence spectrometer (EDP-XRF)
10PotassiumKmg/kgGovin, AlineEnergy dispersive polarization X-ray fluorescence spectrometer (EDP-XRF)
11CalciumCamg/kgGovin, AlineEnergy dispersive polarization X-ray fluorescence spectrometer (EDP-XRF)
12TitaniumTimg/kgGovin, AlineEnergy dispersive polarization X-ray fluorescence spectrometer (EDP-XRF)
13IronFemg/kgGovin, AlineEnergy dispersive polarization X-ray fluorescence spectrometer (EDP-XRF)
14ln-Iron/Calcium ratioln(Fe/Ca)Govin, AlineCalculated
15ln-Titanium/Calcium ratioln(Ti/Ca)Govin, AlineCalculated
16ln-Titanium/Aluminium ratioln(Ti/Al)Govin, AlineCalculated
17ln-Iron/Potassium ratioln(Fe/K)Govin, AlineCalculated
18ln-Aluminium/Silicon ratioln(Al/Si)Govin, AlineCalculated
Size:
1687 data points

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