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Free Content Compositional changes in particulate matter on the Iceland Rise, through the water column, and at the seafloor

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Local resuspension of sediments along the Iceland Rise was substantiated by the collection in sediment traps of large particles whose source is clearly the seafloor. These resuspended components included benthic foraminifera, iron-oxide coated planktonic foraminifera, the glacial, subpolar assemblage planktonic foraminifera (N. pachyderma (sinistral)), and an increase in the volcanic glass and mineral grain/aggregate component with proximity to the seafloor.

The horizontal flux of particulate matter in the near-bottom nepheloid layer through the region was ≃200 kg/s. The apparent vertical flux of sediment calculated from sediment traps at 500 m above bottom (mab) was an order of magnitude less than Recent sediment accumulation rates, suggesting a large fraction of the sediments in the region was brought in horizontally via bottom currents or turbidity currents.

The compositional changes with depth in the material collected in the sediment traps indicated that most of the changes in the material due to dissolution, degradation, and decomposition occurred while the material resided on the seafloor or during periods of resuspension rather than during transit through the water column. Regional variations in clay mineralogy, organic carbon and carbonate content indicated preferential preservation in cores from a channel in the study region or preferential decomposition, dissolution, and/or erosion of the surface sediments beneath the bottom current.

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Document Type: Research Article

Publication date: 1987-02-01

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  • The Journal of Marine Research publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. In the area of biology, studies involving coupling between ecological and physical processes are preferred over those that report systematics. Authors benefit from thorough reviews of their manuscripts, where an attempt is made to maximize clarity. The time between submission and publication is kept to a minimum; there is no page charge.
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