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.

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