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Pelagic sedimentsPelagic sediments, also known as marine sediments, are those that accumulate in the abyssal plain of the deep ocean, far away from terrestrial sources that provide terrigenous sediments; the latter are primarily limited to the continental shelf, and deposited by rivers.[1] Pelagic sediments that are mixed with terrigenous sediments are known as hemipelagic. There are three main types of pelagic sediments:[2]
Ooze does not refer to a sediment's consistency, but to its origin; oozes are primarily biogenic--that is, composed of planktonic debris--while red clays are non-biogenic, with little organic material.[3] More specifically, any sediment composed of more than 30% of microscopic skeletal debris is classified as an ooze.[4] Whatever their provenance, all pelagic sediments accumulate extremely slowly, at no more than a few centimeters per millennium.[5] The type of sediment that accumulates in a given locale is determined by the location's distance from land, water depth, and overall fertility.[6] For instance, the increased solubility of carbon dioxide in seawater with pressure makes the water column more corrosive with depth; below the carbonate compensation depth of ~4.5 km, carbonate dissolution equals deposition.[7] Additional recommended knowledge
Details of Sediment Types
See also
Footnotes:References
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Pelagic_sediments". A list of authors is available in Wikipedia. |