Search Post on this Blog

Give a brief account of ocean deposits. |UP PCS Optional Geography Mains Paper 1 2019




Give a brief account of ocean deposits.
( UPPSC / UPPCS, 2019, 15 Marks)
महासागर निक्षेप à¤•ा संक्षिप्त विवरण दीजिये।




Keywords:

Mud, red mud, blue mud, green mud, 
ooze, 
neritic, 
pelagic, 
Terrigenous,
Calcareous
Siliceous


                                                                Answer:


All the abiotic and biotic deposits on all the relief features of the ocean floor such as a continental shelf, continental rise, and abyssal plains; are called oceanic deposits.

Oceanic deposits are around 500-meter depth, we get information about the history of climate over the earth by studying ocean deposits.
Sources of oceanic deposits:
  • Natural source
  • Human source

Natural sources of Oceanic deposits:


The following are:
  • River deposits: most of the river deposits are settled on the continental shelf.
  • Wave deposits through Marine erosion.
  • Winds deposits from the desert region
  • Volcanic deposits: both from the lithosphere and ocean volcanic origin deposit sand, volcanic dust gets settled into the ocean.
  • Normal Atmospheric clouds of dust sink through precipitation
  • Carbon sinking
  • Dead Phyto and zooplankton deposits
  • Glaciers deposits in higher latitude
  • Meteorites deposits.
Human sources of oceanic deposits:
The following are:
  • Industrial waste
  • Urban waste
  • Agriculture waste
  • Space debris
  • Agricultural waste
  • Tourist garbage

Types of oceanic deposits:
There are two types of Oceanic deposits:

  • Oceanic Mud
  • Ooze deposits

Oceanic Mud:
These are four types:
  • Red mud
  • Blue mud
  • Green mud
All mud are terrigenous deposits.
Red mud:
  • Red color due to the presence of ferric iron. It is found on the continental slope.


Blue mud:
  • Found in continental slope.
  • Fine plastic terrigenous deposits
  • Blue Colour due to the presence of iron sulfide.

Green mud:
  • Green mud due to the presence of calcium carbonate.

Ooze oceanic deposits:

It is oceanic deposits comprise at least 30 % of the organism's skeleton. Ooze deposits are found in the continental rise and abyssal plains.
The following are types of Ooze deposits:

  • Inorganic or non-biogenic material:
    • Terrigenous
    • Red clay
  • Organic or biogenic material:
    • Neritic in shallow depth
    • Pelagic in the deep ocean; it is hard to part of biotic.:
      • Calcareous
      • Siliceous

Terrigenous ooze:
  • Gravel, sand, silt, clay carried by river, winds, and waves.


Calcareous ooze:
  • It is an organic ocean deposit, it is a dead organism shell that is made of calcium carbonate.
  • Region:
    • The Indian ocean and the Atlantic ocean.

Siliceous ooze:
  • It is an organic deposit, made up of an organic shell of silica.

Distribution of oceanic deposits:
The following diagram explains the distribution of oceanic deposits.
Distribution of ocean deposit
Distribution of ocean deposit


You may like also:
Previous
Next Post »