Figure 10. Model of trough mouth fan sedimentation. A. When the ice stream extends to the
continental shelf edge, debris in basal ice and the mobile debris layer at the glacier sole mostly
bypass the shelf and are delivered to the shelf edge, where they are redistributed by debris flows
and turbidity currents. Fine sediment is entrained in buoyant meltwater plumes and settles on the
fan surface. B. During interglacials, the ice has retreated inshore from the shelf edge. Biogenic
sedimentation, ice rafting, and minor reworking by slope processes predominate. Ice keel ploughing
at the shelf edge results in some remobilization of glacial sediment.
To 188 Figure 11
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