Fluvioglacial processes
- Created by: darcie_cl
- Created on: 26-02-14 21:11
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- Fluvioglacial processes
- MELTWATER
- 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
- HYDROSTATIC PRESSURE
- 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
- KAME DELTAS
- Flat-topped mound of stratified debris
- Stream deposits material upon entering a lake at the snout of the glacier
- MELTWATER
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