Fluvioglacial processes

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  • Created by: darcie_cl
  • Created on: 26-02-14 21:11
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  • Fluvioglacial processes
      • Surface melting; daily and seasonal variations
      • Basal melting - subglacial channels
      • Material deposited by meltwater beyond ice margins it is called outwash
      • Calm condition deposits - clear layers known as varves
      • Lots of underwater pressure from strong hydrolic action and due to large glacier weight
      • High pressure and velocity = abrasion, cavitation and chemical disintegration
    • KAMES
      • Steep-sided mounds of fluvioglacial material of various shaped and sizes with a variety of possible origins laid down by glacial melt-water
      • Material transported by meltwater may be deposited in crevasses, in hollows or in ice tunnels
      • Ice melts and material is dropped in a heap on the valley floor
    • ESKERS
      • A long narrow ridge, often having curves, composed of stratified sediment and marking the former location of a glacial tunnel
      • Marks the course of streams that once transported subglacial meltwater beneath the glacier - revealed when the ice retreated
      • Ice melts, water flows through the glacier and drains out infront of the ice sheet. Large tunnels deposit much debris. As ice melts more debris is deposited on the floor.
      • Once the full glacier has melted the leftover debris forms a raised ridge - an esker
      • 3 types; Sharp -crested, Multiple -crested and Broad - crested
      • Different velocities = variations in channel curves
      • Flat-topped mound of stratified debris
      • Stream deposits material upon entering a lake at the snout of the glacier


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