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Kuhn, Thomas; Bau, Michael; Blum, Nevin; Halbach, Peter (1998): Geochemistry of Fe-Mn crusts in sediments of the Central Indian Ridge. PANGAEA, https://doi.org/10.1594/PANGAEA.735050, Supplement to: Kuhn, T et al. (1998): Origin of negative Ce anomalies in mixed hydrothermal-hydrogenetic Fe-Me crusts from the Central Indian Ridge. Earth and Planetary Science Letters, 163(1-4), 207-220, https://doi.org/10.1016/S0012-821X(98)00188-5

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Abstract:
Layered Fe-Mn crusts from the off-axis region of the first segment of the Central Indian Ridge north of the Rodrigues Triple Junction were studied geochemically and mineralogically. Vernadite (delta-MnO2) is the main mineral oxide phase. 230Thxs and Co concentrations suggest high growth rates of up to 29 mm/Myr and a maximum age of the basal crust layer of 1 Ma. Whereas most of the major and minor elements show concentrations which are typical of hydrogenetic formation, Co, Pb, Ni and Ti concentrations are strikingly lower. Concentrations and distribution of the strictly trivalent rare-earths and yttrium (REY) are typical of hydrogenetic ferromanganese oxide precipitates, but in marked contrast, the crusts are characterized by negative CeSN (shale normalized) anomalies and (Ce/Pr)SN ratios less than unity. Profiles through the crusts reveal only minor variations of the REY distribution and (Ce/Pr)SN ratios range from 0.45 to 0.68 (compared to ratios of up to 2 for typical hydrogenetic crusts from the Central Indian Basin). The apparent bulk partition coefficients between the crusts and seawater suggest that for the strictly trivalent REY the adsorption-desorption equilibrium has been reached. Positive Ce anomalies in the partition coefficient patterns reveal preferential uptake of Ce, but to a lesser extent than in normal hydrogenetic crusts. A new parameter (excess Ce, Cexs) to quantify the degree of decoupling of Ce from REY(III) is established on the basis of partition coefficients. Cexs/Cebulk ratios suggest that the CIR crusts formed by precipitation of Fe-Mn oxides from a hydrothermal plume and that in hydrothermal plumes and normal seawater the enrichment of Ce results from the same oxidative sorption process. The growth rates, calculated with 230Thxs data as well as with the Co formula, are inversely related to Cexs.
Coverage:
Median Latitude: -20.017025 * Median Longitude: 55.212199 * South-bound Latitude: -25.855000 * West-bound Longitude: 0.000000 * North-bound Latitude: 0.000000 * East-bound Longitude: 70.036667
Date/Time Start: 1993-12-01T00:00:00 * Date/Time End: 1993-12-01T22:45:00
Event(s):
SO92_26PC * Latitude: -23.392800 * Longitude: 69.240800 * Date/Time: 1993-12-01T00:00:00 * Elevation Start: -2853.0 m * Elevation End: 0.0 m * Campaign: SO92 (HYDROTRUNC) * Basis: Sonne * Device: Piston corer (PC) * Comment: Position not given; same position as SO92-26GTV
SO92_27PC * Latitude: -23.998300 * Longitude: 69.673300 * Date/Time: 1993-12-01T00:00:00 * Elevation Start: -2901.0 m * Elevation End: 0.0 m * Campaign: SO92 (HYDROTRUNC) * Basis: Sonne * Device: Piston corer (PC) * Comment: Position not given; same position as SO92-27MS
SO92_31GTV * Date/Time: 1993-12-01T00:00:00 * Elevation Start: -2879.0 m * Elevation End: 0.0 m * Campaign: SO92 (HYDROTRUNC) * Basis: Sonne * Device: Television-Grab (TVG) * Comment: Position not given
Size:
24 datasets

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Datasets listed in this publication series

  1. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of Fe-Mn-crusts of sediment core SO92-31GTV. https://doi.org/10.1594/PANGAEA.57601
  2. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of Fe-Mn-crusts of sediment core SO92-36GTV. https://doi.org/10.1594/PANGAEA.713022
  3. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of Fe-Mn-crusts of sediment core SO92-38GK. https://doi.org/10.1594/PANGAEA.713023
  4. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of Fe-Mn-crusts of sediment core SO92-55KL. https://doi.org/10.1594/PANGAEA.713024
  5. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of Fe-Mn-crusts of sediment core SO92-58KL. https://doi.org/10.1594/PANGAEA.713025
  6. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of Fe-Mn-crusts of sediment core SO92-60GTV. https://doi.org/10.1594/PANGAEA.713026
  7. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of Fe-Mn-crusts of sediment core SO92-60GTV/13. https://doi.org/10.1594/PANGAEA.713027
  8. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of Fe-Mn-crusts of sediment core SO92-60GTV/15. https://doi.org/10.1594/PANGAEA.713028
  9. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of Fe-Mn-crusts of sediment core SO92-74GTV. https://doi.org/10.1594/PANGAEA.713029
  10. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of Fe-Mn-crusts of sediment core SO92-81PC. https://doi.org/10.1594/PANGAEA.713030
  11. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of Fe-Mn-crusts of sediment core SO92-95PC. https://doi.org/10.1594/PANGAEA.713031
  12. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of sediment core SO92-26PC. https://doi.org/10.1594/PANGAEA.57572
  13. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of sediment core SO92-27PC. https://doi.org/10.1594/PANGAEA.57573
  14. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of sediment core SO92-54GK. https://doi.org/10.1594/PANGAEA.104501
  15. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of sediment core SO92-54GK. https://doi.org/10.1594/PANGAEA.57574
  16. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of sediment core SO92-72PC. https://doi.org/10.1594/PANGAEA.57575
  17. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of sediment core SO92-72PC. https://doi.org/10.1594/PANGAEA.104502
  18. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of sediment core SO92-81PC. https://doi.org/10.1594/PANGAEA.104503
  19. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of sediment core SO92-81PC. https://doi.org/10.1594/PANGAEA.57576
  20. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of sediment core SO92-95PC. https://doi.org/10.1594/PANGAEA.104504
  21. Kuhn, T; Bau, M; Blum, N et al. (1998): Geochemistry of sediment core SO92-95PC. https://doi.org/10.1594/PANGAEA.57577
  22. Kuhn, T; Bau, M; Blum, N et al. (1998): Nannoplankton assemblage and stratigraphy of sediment core SO92-72PC. https://doi.org/10.1594/PANGAEA.57819
  23. Kuhn, T; Bau, M; Blum, N et al. (1998): Nannoplankton assemblage and stratigraphy of sediment core SO92-81PC. https://doi.org/10.1594/PANGAEA.57925
  24. Kuhn, T; Bau, M; Blum, N et al. (1998): Nannoplankton assemblage and stratigraphy of sediment core SO92-95PC. https://doi.org/10.1594/PANGAEA.57820