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Fluidization experiments show that as flow velocities increase small grains can be carried through fluidizing beds containing a mixture of coarse and fine grains.
They occur when a layer of unconsolidated sediment is fluidized and transport of fluid and suspended grains takes place through overlying sediment to the sediment-water interface.
After fluidization ceased and the fluid pressure dropped, walls contracted, resulting in increased grain contact stresses, and bands parallel to the margins developed.
Deformation bands and early calcite cement develop upon wall-rock contraction after fluidization ceased and fluid pressures dropped.
One factor that may control early calcite precipitation in sand injections is pressure drops that occurred shortly after fluidization ceased.
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