Processes of glacial deposition - Ice ablation Flashcards
1
Q
Where is ablation concentrated?
A
Ablation is concentrated near the snout of ice masses that are stagnant or in recession and is caused by the direct release of debris due to melting (melt-out).
2
Q
Why does ablation cause rock debris to be deposited?
A
Rock debris is deposited or ‘dumped’ because of the melting away of the ice around it.
3
Q
Describe the two ways which ice ablation deposition occurs?
A
- Deposition occurs subglacially due to the melting of basal ice by geothermal heat
- Deposition occurs supraglacially when solar radiation melts ice surrounding surface and englacial rock debris.
4
Q
Describe the rock debris that it deposited due to ablation?
A
Melt out can involve the release of a thick debris layer or single clasts.