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← GeographyWhich mechanism initiates desert pavement formation within an alluvial fan environment?
A)Cryoturbation sorting during freeze-thaw cycles
B)Deflation sorting by wind action over time✓
C)Dissolution of exposed calcrete layers
D)Chemical weathering creating resistant clasts
💡 Explanation
When fine sediment is removed, deflation sorting occurs because wind action selectively transports smaller particles (e.g., silt, clay), leaving behind larger, more resistant rocks and pebbles that interlock to form desert pavement. Therefore deflation is the initiating mechanisim; cryoturbation, dissolution, or resistance do not primarily dictate this sedimentary process.
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