pelagic sediments - definição. O que é pelagic sediments. Significado, conceito
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O que (quem) é pelagic sediments - definição

FINE-GRAINED SEDIMENT THAT ACCUMULATES ON THE FLOOR OF THE OPEN OCEAN
Pelagic Sediments; Pelagic sediments; Biogenous sediment; Marine ooze; Pelagic ooze; Deep ocean sediment
  • '''Total sediment thickness of the ocean floor'''}} Deposits are thick on the continental shelves, and thinnest in the deep sea on either side of the [[mid-ocean ridge]].

Pelagic sediment         
Pelagic sediment or pelagite is a fine-grained sediment that accumulates as the result of the settling of particles to the floor of the open ocean, far from land. These particles consist primarily of either the microscopic, calcareous or siliceous shells of phytoplankton or zooplankton; clay-size siliciclastic sediment; or some mixture of these.
Cyclic sediments         
  • High Atlas middle liassic carbonate platform of Morocco and succession of regressive, autocyclic, "shallowing upward" metric sequences.
  • Model of a virtual "shallowing upward" metric sequence observed on carbonate platforms all along the south tethyan margin (about 10.000km) during the Liassic. (Micro)fossils are identical from the Maghreb till Oman and furtheron.
  • "shallowing upward" sequences from two sections distant of 230 km; note the hurricane (tempestites and tsunami ?)levels with abundant displaced foraminifera on supratidal flat. Middle Liassic, Morocco.
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SEQUENCES OF SEDIMENTARY ROCKS THAT ARE CHARACTERISED BY REPETITIVE PATTERNS OF DIFFERENT ROCK TYPES (STRATA) OR FACIES WITHIN THE SEQUENCE
Cyclic sedimentation; Cyclic sediment; Rhythmic sediment; Rhythmic sediments; Depositional cycle
Cyclic sediments (also called rhythmic sediments) are sequences of sedimentary rocks that are characterised by repetitive patterns of different rock types (strata) or facies within the sequence. Processes that generate sedimentary cyclicity can be either autocyclic or allocyclic, and can result in piles of sedimentary cycles hundreds or even thousands of metres thick.
pelagic         
  • 50px
  •  The pelagic [[wandering albatross]] (''Diomedea exulans'') ranges over huge areas of ocean and can circle the globe.
  • Layers of the pelagic zone (scaled)}}
  • 50px]] Material was copied from this source, which is available under a [https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International License].</ref>
ANY WATER THAT IS NEITHER CLOSE TO THE BOTTOM NOR NEAR THE SHORE
Pelagic; Epipelagic Zone; Pelagic Realm; Pelagic realm; Open ocean; Pelagic division; Open sea; Aquatic layer; Pelagic bird; Pelagic birds; Pelagic waters; Pelagic plastic
[p?'lad??k]
¦ adjective
1. relating to the open sea.
2. (chiefly of fish) inhabiting the upper layers of the open sea.
(of a bird) inhabiting the open sea and returning to shore only to breed.
¦ noun a pelagic fish or bird.
Origin
C17: via L. from Gk pelagikos, from pelagios 'of the sea'.

Wikipédia

Pelagic sediment

Pelagic sediment or pelagite is a fine-grained sediment that accumulates as the result of the settling of particles to the floor of the open ocean, far from land. These particles consist primarily of either the microscopic, calcareous or siliceous shells of phytoplankton or zooplankton; clay-size siliciclastic sediment; or some mixture of these. Trace amounts of meteoric dust and variable amounts of volcanic ash also occur within pelagic sediments. Based upon the composition of the ooze, there are three main types of pelagic sediments: siliceous oozes, calcareous oozes, and red clays.

The composition of pelagic sediments is controlled by three main factors. The first factor is the distance from major landmasses, which affects their dilution by terrigenous, or land-derived, sediment. The second factor is water depth, which affects the preservation of both siliceous and calcareous biogenic particles as they settle to the ocean bottom. The final factor is ocean fertility, which controls the amount of biogenic particles produced in surface waters.