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5-OcFA11-Sed_Abrev_WEB - Marine Sediments Particles that...

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Marine Sediments Particles that accumulate on the seafloor Accumulations of organic and inorganic particles Generally covers all of ocean floor Sedimentology- The study of sediment Where do the particles come from? How/Where do they end up on the seafloor? What can they tell us? Collection Methods Suspended Sediments: From the water column, floating or sinking: pump and filter sediment traps Surface Sediments: sediment close to the sediment-water interface grab sampler box corer From layers of sediment far below the surface: Sediment Core gravity core piston core deep sea drilling Why study marine sediment? - Reflects what’s going on above - Contains a record of the past ocean environment - Some of economic significance - Much marine life lives there
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Marine Sediment Classification BY LOCATION Neritic Sediment – coastal including shelf (mostly lithogenous) Pelagic – from slope to deep ocean floor (majority but not all biogenic) BY DELIVERY AGENT Riverine – by rivers •Aeolian – by wind –Can use variations in wind blown dust to monitor aridity, wind direction –-Types; Fire ash, Glacial – dropped by glaciers or iceburgs (ice rafted) BY SOURCE Terrigenous - from land = Lithogenous - from rocks (found everywhere but especially close to continents) Biogenous - from organisms (found everywhere but especially under high productivity areas)
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