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  • Brill Nijhoff  (1)
  • Elsevier  (1)
  • 2020-2022  (1)
  • 1995-1999  (1)
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Year
  • 1
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    Reactive Fe (II) layers in deep-sea sediments (1999)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 63 (10). pp. 1517-1526.
    Details
    Publication Date: 2017-08-25
    Description: The percentage of the structural Fe(II) in clay minerals that is readily oxidized to Fe(III) upon contact with atmospheric oxygen was determined across the downcore tan–green color change in Peru Basin sediments. This latent fraction of reactive Fe(II) was only found in the green strata, where it proved to be large enough to constitute a deep reaction layer with respect to the pore water O2 and NO3−. Large variations were detected in the proportion of the reactive Fe(II) concentration to the organic matter content along core profiles. Hence, the commonly observed tan–green color change in marine sediments marks the top of a reactive Fe(II) layer, which may represent the major barrier to the movement of oxidation fronts in pelagic subsurface sediments. This is also demonstrated by numerical model simulations. The findings imply that geochemical barriers to pore water oxidation fronts form diagenetically in the sea floor wherever the stage of iron reduction is reached, provided that the sediments contain a significant amount of structural iron in clay minerals.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0016-7037(99)00104-0
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Environmental Impacts of Deep Seabed Mining (2020)
    Brill Nijhoff
    In:  EPIC3New Knowledge and Changing Circumstances in the Law of the Sea, Deep Seabed Mineral Resources and the Marine Environment, Leiden, The Netherlands, Brill Nijhoff, pp. 327-340
    Details
    Publication Date: 2020-10-01
    Description: Exploitation of mineral ores from the deep sea will impact the abyssal environment by removing the mineral deposits and sediments from the seafloor surface, where most deep-sea benthic life is found. Additional effects are expected from the blanketing of the mined area and the pristine surrounding seabed with sediments and/or mineral debris. As a consequence, seafloor integrity is lost in the impacted area, species densities and biodiversity are reduced, and ecosystem functions are negatively affected. Although a lot of open questions remain regarding, for example, indicator species, disturbance thresholds, and renaturation options, it is becoming increasingly clear that the induced environmental impacts last for at least many decades to centuries and affect all ecosystem compartments.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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    PAPER (OA)
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