Factors influencing sediment deposition:
* Water Velocity: As water slows down, it loses energy and can no longer carry heavier sediments. Lighter sediments like clay, silt, and fine sand settle out first.
* Wind Speed: Similar to water, wind carries lighter particles further. As wind slows down, it deposits these lighter sediments.
* Water Depth: Deeper water generally has calmer conditions, allowing finer sediments to settle.
* Distance from Source: Sediments transported a long distance will be smaller and finer due to abrasion and sorting.
Specific depositional environments for lighter sediments:
* Lakes and Lagoons: These protected environments have calm water and allow fine sediments to settle.
* Deep Ocean Basins: Deep ocean floors receive fine-grained sediments from the surface, carried by currents.
* Deltas: As rivers enter larger bodies of water, they lose energy and deposit fine-grained sediments in the delta.
* Floodplains: During floods, rivers overflow their banks and deposit fine sediment on the floodplain.
* Sand Dunes: Fine sand grains can be transported by wind and deposited in dune fields.
* Glacial Outwash Plains: Melted glacial water carries fine sediment and deposits it in outwash plains.
In general, lighter sediments are found in areas where the following conditions are present:
* Protected from strong currents and waves
* Calm water or gentle winds
* Further away from the sediment source
Important Note: The specific type of sediment deposited also depends on the source rock and its weathering processes. For instance, volcanic eruptions can produce fine ash, which is a lighter sediment.
