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