Processes of glacial deposition - Ice ablation Flashcards

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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).

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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.

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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.
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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.

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