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Haese, Ralf R; Schramm, J; Rutgers van der Loeff, Michiel M; Schulz, Horst D (2000): Geochemistry of continental slope and deep sea basin sediments off Uruguay. PANGAEA, https://doi.org/10.1594/PANGAEA.712135, Supplement to: Haese, RR et al. (2000): A comparative study of iron and manganese diagenesis in continental slope and deep sea basin sediments off Uruguay (SW Atlantic). International Journal of Earth Sciences (Geologische Rundschau), 88(4), 619 - 629, https://doi.org/10.1007/s005310050292

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Abstract:
Pore water and solid phase from surface sediments of the continental slope off Uruguay and from the Argentine Basin (southwestern Atlantic) were investigated geochemically to ascribe characteristic early diagenetic reactions of iron and manganese. Solid-phase iron speciation was determined by extractions as well as by Mössbauer spectroscopy. Both methods showed good agreement (<6% deviation) for total-Fe speciation. The proportion of easy reducible iron oxyhydroxide relative to total-Fe oxides decreased from the continental slope to the deep sea which is attributed to an increase in crystallinity during transport as well as to a general decrease of iron mobilization. The product of iron reoxidation is Fe oxyhydroxide which made up less than 5% of total Fe. In addition to this fraction, a proportion of smectite bound iron was found to be redox reactive. This fraction made up to 10% of total Fe in sediments of the Argentine Basin and was quantitatively extracted by 1 N HCl. The redox reactive Fe(+II) fraction of smectite was almost completely reoxidized within 24 h under air atmosphere and may therefore considerably contribute to iron redox cycling if bioturbation occurs. In the case of the slope sediments we found concurrent iron and manganese release to pore water. It is not clear whether this is caused by dissimilatory iron and manganese reduction at the same depth or dissimilatory iron reduction alone inducing Mn(+IV) reduction by (abiotic) reaction with released Fe2+. The Argentine Basin sediment showed a significant manganese solid-phase enrichment above the denitrification depth despite the absence of a distinct pore-water gradient of Mn. This implies a recent termination of manganese mobilization and thus a non-steady-state situation with respect to sedimentation or to organic carbon burial rate.
Related to:
Haese, Ralf R (1997): Beschreibung und Quantifizierung frühdiagenetischer Reaktionen des Eisens in Sedimenten des Südatlantiks. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 99, 118 pp, urn:nbn:de:gbv:46-ep000102231
Coverage:
Median Latitude: -36.232917 * Median Longitude: -48.926667 * South-bound Latitude: -37.596667 * West-bound Longitude: -52.386667 * North-bound Latitude: -35.601667 * East-bound Longitude: -39.071667
Date/Time Start: 1994-07-20T00:00:00 * Date/Time End: 1994-07-26T00:00:00
Event(s):
GeoB2810-2 * Latitude: -35.980000 * Longitude: -51.978333 * Date/Time: 1994-07-20T00:00:00 * Elevation: -2909.0 m * Recovery: 0.37 m * Location: Uruguay continental margin * Campaign: M29/2 * Basis: Meteor (1986) * Device: MultiCorer (MUC) * Comment: core recovery 10 / 10
GeoB2811-1 * Latitude: -35.753333 * Longitude: -52.270000 * Date/Time: 1994-07-20T00:00:00 * Elevation: -1789.0 m * Recovery: 0.35 m * Location: Uruguay continental margin * Campaign: M29/2 * Basis: Meteor (1986) * Device: MultiCorer (MUC) * Comment: core recovery 10 / 10
GeoB2812-3 * Latitude: -35.601667 * Longitude: -52.386667 * Date/Time: 1994-07-20T00:00:00 * Elevation: -1041.0 m * Recovery: 0.4 m * Location: Uruguay continental margin * Campaign: M29/2 * Basis: Meteor (1986) * Device: MultiCorer (MUC) * Comment: core recovery 10 / 10
Size:
12 datasets

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Datasets listed in this Collection

  1. Haese, RR; Schramm, J; Rutgers van der Loeff, MM et al. (2000): Geochemistry of sediment core GeoB2810-2. https://doi.org/10.1594/PANGAEA.225421
  2. Haese, RR; Schramm, J; Rutgers van der Loeff, MM et al. (2000): Geochemistry of sediment core GeoB2811-1. https://doi.org/10.1594/PANGAEA.225422
  3. Haese, RR; Schramm, J; Rutgers van der Loeff, MM et al. (2000): Geochemistry of sediment core GeoB2812-3. https://doi.org/10.1594/PANGAEA.225423
  4. Haese, RR; Schramm, J; Rutgers van der Loeff, MM et al. (2000): Geochemistry of sediment core GeoB2814-3. https://doi.org/10.1594/PANGAEA.225424
  5. Haese, RR; Schramm, J; Rutgers van der Loeff, MM et al. (2000): Iron II and iron III of sediment core GeoB2810-2. https://doi.org/10.1594/PANGAEA.225425
  6. Haese, RR; Schramm, J; Rutgers van der Loeff, MM et al. (2000): Iron II and iron III of sediment core GeoB2811-1. https://doi.org/10.1594/PANGAEA.225426
  7. Haese, RR; Schramm, J; Rutgers van der Loeff, MM et al. (2000): Iron II and iron III of sediment core GeoB2812-3. https://doi.org/10.1594/PANGAEA.225427
  8. Haese, RR; Schramm, J; Rutgers van der Loeff, MM et al. (2000): Iron II and iron III of sediment core GeoB2814-3. https://doi.org/10.1594/PANGAEA.225428
  9. Haese, RR; Schramm, J; Rutgers van der Loeff, MM et al. (2000): Manganese of sediment core GeoB2810-2. https://doi.org/10.1594/PANGAEA.53060
  10. Haese, RR; Schramm, J; Rutgers van der Loeff, MM et al. (2000): Manganese of sediment core GeoB2811-1. https://doi.org/10.1594/PANGAEA.53062
  11. Haese, RR; Schramm, J; Rutgers van der Loeff, MM et al. (2000): Manganese of sediment core GeoB2812-3. https://doi.org/10.1594/PANGAEA.53066
  12. Haese, RR; Schramm, J; Rutgers van der Loeff, MM et al. (2000): Manganese of sediment core GeoB2814-3. https://doi.org/10.1594/PANGAEA.53070