Marine Sedimentation. Sediment Defined: unconsolidated organic and inorganic particles that accumulate on the ocean floor originate from numerous sources weathering and erosion of the continents volcanic eruptions biological activity
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Sediment in the Sea
Sediment in the SeaClassification of marine sediments can be based upon size or origin.
Nearshore sediments, turbidites:Up to km/my (kilometers/million years)Hemipelagic deposits: Tens to hundreds of m/myDrift deposits40-400 m/myMid-latitude eolian deposits: 3 to 10 m/myIce rafted material: 10+ m/myCarbonate oozes: Up to 50 m/mySiliceous oozes: Up to 10 m/myHydrothermal deposits: (off ridge axes)About 0.5 m/myHydrogenous sediments: Rarely exceed 0.2 m/myFerromanganese nodules: 0.0002 to 0.005 m/my (0.2 to 5 mm/my)
Sedimentation in the OceanShelf sedimentation is strongly controlled by tides, waves and currents, but their influence decreases with depth.
Sedimentation in the OceanGeologic controls of continental shelf sedimentation must be considered in terms of a time frame.
60% of the world’s shelves are covered with relict sediments that were formed about 15,000 y BP under a different energy regime.