Describe and discuss one mechanical and one chemical process of weathering that

Question

Describe and discuss one mechanical and one chemical process of weathering that contribute to sediment maturity. There are three components that may be used to describe clastic sediment maturity: shape; size; and. mineralogical. Describe and discuss how and why these measures of sediment maturity develop during sediment transport. Sediment transport in streams and rivers may be sub-divided into the bed-load, suspended load and dissolved load. Describe the relationship between the three components of sediment transport, and the related concepts of flow rate and regime, grain size, and sediment mobility.

Explanation / Answer

Q-8:

Example of mechanical weathering process: Frost wedging

This process occurs as water expands when it is freezed. Due to this process, sedimentary rocks are breaking apart by repeated cycles of freeze-thaw.

It happens when the rock is repeatedly wetted and dried: here, salt crystals are dissolved from the rock , and then they grow when they are dried.

Both of the above processes can result in heaving of rocks. They look like patterns of bricks set in a pavement. They eventually become chaotic jumbles of bricks.  

Example of chemical weathering: Oxidation

The chemical formula for oxidation is:

4Fe+2 +3O2 ---------> 2Fe2O3

Here, ferrous iron combines with oxygen to form ferric iron oxide (hematite). Thishappens to all iron-bearing silicates .

Examples of eaction minerals: hematite, limonite, and goethite.

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