DMPQ: Give a classification of ocean deposits on the basis of sources.

Most important sorts of ocean deposits are:

  • Terrigenous Deposits
  • Body of water Deposits.

There are loose sediments, deposited on the ocean bottom. These are ocean deposits. They vary from location to location.

The study of ocean deposits is vital in beneath standing the rocks exposed on the earth’s surface that were once set under ocean.


The ocean deposits will generally be divided into 2 types—the terrigenous deposits and also the body of water deposits. The terrigenous deposits are those that are found on the continental shelves and slopes and in the main incorporate the rock material derived thanks to wear and tear. The body of water deposits are those that are found over deep ocean plains and also the deeps.

These deposits in the main incorporate organic remains of plants and animals. However this distinction between the 2 sorts of deposits isn’t absolute. For instance, the terrigenous deposits might not continuously incorporate the fragmented rock material and will be carried deep into the ocean. Also, the body of water deposits might — not continuously incorporates the plant and animal remains and will be extended for up to the continental slope.

  1. Terrigenous Deposits:

Terrigenous deposits are found from the wear and tear of land masses and volcanic and organic product. The larger a part of the deposits on the ocean bottom and slopes comes from rock material let out by disintegration and decomposition by the agents of weathering and carried to ocean by the agents of erosion, like running water, wind, etc.

On the idea of size of particles, the terrigenous deposits is also categorized into 3 classes— mud, sand and gravel. Mud refers to the best particles that comprise the minute particles of rock forming minerals, in the main quartz. Murray has classified the mud deposits into blue, green and red varieties supported the color of constituents. Sand refers to the coarser particles, whereas gravel has even bigger particles.

Volcanic Products:

In volcanic areas the deposits of continental shelf and consist principally of product of geological occurrence that are subject to chemical and mechanical weathering and are carried to the ocean by actions of  water and wind. The volcanic deposits take issue from the standard terrigenous deposits in one respect—they are made from pyroclastic volcanic product and volcanic rock, instead of quartz.

Organic product are deposits comprises shells and bones of varied plants and animals that live and grow on the ocean bed and are turned into mud and sand by chemical and mechanical processes. They take issue from the standard terrigenous deposits within the sense that they comprise calcium carbonate solely.

  1. Pelagic Deposits:

Pelagic deposits are the foremost conspicuous of all deposits—covering concerning seventy fifth of the whole ocean floor. this is often as a result of, apart from fine volcanic ash, very little terrigenous material is carried into the deeps. The pelagic deposits comprise each organic and inorganic material.

Organic Material:

This is within the sort of a sort of liquid mud, known as ooze that contains shells and skeletons of varied marine organisms. The ooze is alleged to be calcareous once the shell is created of calcium carbonate. The calcareous ooze could also be either pteropod ooze or globogerina ooze. Most components of the Indian and Atlantic Oceans have chalky ooze as deposits. Once the shell is created of silica, the ooze is alleged to be silicious ooze, which might be either the diatom sort or the radiolarian variety of ooze. The southern fringes of the Indian and also the Atlantic Oceans have the siliceous variety of ooze.

Inorganic Material:

This is within the sort of clay that is seemingly of a volcanic origin. The chief constituents of clay are silicon and aluminium oxide, whereas alternative constituents embody iron, manganese, phosphorus and radium. The clay is that the most generally unfold body of water deposit and covers 38th of the ocean floor. The clay covers over 1/2 the Pacific floor

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