Processes of glacial deposition - Glacial deposition from debris-rich glacier ice Flashcards
Describe the material that is deposited by a glacier?
Glaciers carry a wide range of particle sizes. The resulting deposits contain a mix of larger clasts (boulders, cobbles and pebbles) and finer material (sand, silt and clay).
Give three examples of larger clasts that are deposited by the glacier?
- Boulders
- Cobbles
- Pebbles
Give three examples of finer material that is deposited by the glacier?
- Sand
- Silt
- Clay
What is deposited material referred to as?
Once deposited, material is referred to as till.
How can tills be subdivided?
Tills may be subdivided based on the typical processes assumed to have been dominant in their formation.
When does deposition occur?
Deposition occurs when rock debris is released from ice and is no longer being actively transported.
What are the main processes by which glaciers deposit material?
- Ablation
- Lodgement,
- Deformation
- Flow
