Competitive Exams: Oceanography Deposits

Oceanic Deposits

  1. Gravels: Its diameter 2 mm-256 mm; are sediments and are deposited near the coast on the 256 mm (diameter). cobbles-64 mm. pebbles-4 mm. granules-2 mm.

  2. Blue Mud: Materials derived through the disintegration of rocks rich in Iron sulphide. It is especially found in Atlantic ocean, Mediterranean sea and Arctic sea and has 35% of calcium carbonate

  3. Red Mud: Rocks rich in Iron oxides, contains 32% of calcium carbonate and found at Yellow sea, Brazilian Coast

  4. Green Mud: Contains green silicates of potassium (K) and Glauconite (form of iron) and contains 0 − 56% of CaCo3 and found mainly in Japanese, Australian and African coasts, at the depth of 100 − 900 fathoms.

  5. Calcareous Oozes: Contains lime and generally found is of two kinds

    1. Peteropod Ooze: Has 80% of CaCo3, found in tropical oceans, especially Canary island, entails mid Mediterranean ridge

    2. Globigerina Ooze: 64.46 Ca, 1.64% silica, found in tropical and temperate zones of Atlantic ocean between the depth of 2, 000 − 4, 000 fathoms.

  6. Red Clay: Has silicates of alumina in abundance (85.35%) and oxides of iron, calcium.