biogenous sediments - определение. Что такое biogenous sediments
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Что (кто) такое biogenous sediments - определение

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]].

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 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.
Sediment         
PARTICULATE MATTER THAT IS DEPOSITED ON THE SURFACE OF LAND
Sediments; Detrital sediment; Sea Sediment; Sedements; Sedimented; Sedimentary soil; Sedimentary layer; Lake sediment; Fluviatile sediment; Sediment (geology)
·noun The material of which sedimentary rocks are formed.
II. Sediment ·noun The matter which subsides to the bottom, frrom water or any other liquid; settlings; lees; dregs.

Википедия

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.