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Sorting of Sediments and Deposition

Sorting of Sediments and Deposition. Agents of Deposition. The agents of erosion are also agents of deposition. Depositional rate depends on sediment size, shape and density. Depositional rate also depends on characteristics of the depositional agent. Speed or velocity. Agents of Deposition.

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Sorting of Sediments and Deposition

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  1. Sorting of Sediments and Deposition

  2. Agents of Deposition • The agents of erosion are also agents of deposition. • Depositional rate depends on sediment size, shape and density. • Depositional rate also depends on characteristics of the depositional agent. Speed or velocity

  3. Agents of Deposition • -

  4. Settling Rate Vs. Velocity • - Settling Rate Velocity

  5. Settling Rate Vs. Density • - Settling Rate Density

  6. Settling Time Vs. Rate • - Settling Rate Settling Time

  7. Horizontal Sorting As the stream enters the lake or an ocean, the stream velocity decreases and sediments are deposited. Stream velocity decreases Stream Mountain side Lake Boulders Pebbles Cobbles Sand Clay Silt -

  8. Stream Vertical Sorting Region of maximum stream velocity changes when streams bend or turn. There is aninterface between regions of erosion and deposition… Deposition Erosion Vertical Sorting Deposition Clay Silt Sand Erosion Pebbles Cobbles Boulders

  9. Earliest layer Latest layer Later layer Vertical Sorting • - • Vertical sorting can occur as a single depositional event in still water or a series of events as when a stream’s velocity decreases through the seasons allowing particles to settle in a - Vertical Sorting

  10. Vertical Sorting

  11. Ocean Stream Deltas - Named for the Greek letter

  12. Mississippi Delta • Sediment-laden river water mixes with cold, deep-sea currents, creating a nutrient rich zone where both salt and freshwater fish flourish.

  13. Deposition by other agents of erosion • Wind-- • -

  14. Crossbeds in a Sand Dune

  15. Unsorted Sediments • - • -

  16. Final Question • What are the factors that affect the settling rates of sediments? • ---

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