Sorting of Sediments and Deposition
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Transcript of Sorting of Sediments and Deposition
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Sorting of Sediments and Deposition
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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
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Agents of Deposition
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Settling Rate Vs. Velocity
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Velocity
Settl
ing
Rate
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Settling Rate Vs. Density
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Density
Sett
ling
Rate
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Settling Time Vs. Rate
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Settling Time
Sett
ling
Rate
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Mountain side
Stream
Lake
As the stream enters the lake or an ocean, the stream velocity decreases
and sediments are deposited.
Stream velocity
decreases
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Horizontal Sorting
BouldersCobbles
PebblesSand Silt Clay
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Region of maximum stream velocity changes when streams bend or turn. There is an interface between regions of erosion and deposition…
Stream
BouldersCobblesPebblesSand
Vertical SortingClay
Silt
Vertical Sorting
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Vertical Sorting
•-Vertical Sorting
Latest layer
Earliest layerLater layer
•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 -
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Vertical Sorting
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Named for the Greek letter
Stream
Ocean
Deltas
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Mississippi Delta• Sediment-laden
river water mixes with cold, deep-sea currents, creating a nutrient rich zone where both salt and freshwater fish flourish.
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• Wind--• -
Deposition by other agents of erosion
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Crossbeds in a Sand Dune
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Unsorted Sediments
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Final Question
• What are the factors that affect the settling rates of sediments?
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