3a.Glacio-Fluvial Flashcards
1
Q
Glacio-fluvial deposits
A
- Deposited by melt water
- Rounded
- Layered
- Sorted
- Stratified
- Sand / gravel
2
Q
Glacio-fluvial landforms
A
- Produced from meltwater from glaciers
- Includes erosional & depositional landforms
- Kames (Terraces & Delta)
- Eskers
- Outwash plains
3
Q
Outwash
A
- Deposited directly by glacial ice
- Smaller, melt water streams have less energy
- smooth & round, water contact
- Sorted, melt water gradually loosing energy
- Stratified, distinct seasonal & annual layers
4
Q
Kames - Terraces
A
-Hill composed of stratified sand and gravel
- Ridges of material running along edge of valley floor
- Supraglacial streams on edge carry lateral moraine —> deposited due to retreat
- Streams form by ice melting due to friction with valley
- Rounded & sorted
5
Q
Kames - Delta
A
-Hill composed of stratified sand and gravel
- Can be formed by en-glacial streams emerging at snout of glacier
- Streams loose energy & deposit
- Can be formed by supraglacial streams depositing on ice-marginal lakes
- Streams loose energy when enter static body of water
- Can be formed by debris filled crevasses collapsing when ice retreats
6
Q
Eskers
A
- Long sinuous ridge
- Stratified sand & gravel from meltwater
- Material deposited subglacial tunnels as meltwater decreases (end of glacial period)
- Sub-glacial streams carry large ammount of debris in tunnels under pressure
- As snout retreats, deposition point retreats
- Causes Hight variation depending on rate of retreat
7
Q
Outwash plains
A
- AKA sandur
- Flat expense of sediment in glacial area
- Streams loose energy in low land areas
- largest material deposited infront of ice, smallest further away
8
Q
Modification of deposits
A
- Repeated advance and retreat modify appearances
- Can be weathered / eroded / colonised by vegetation
- Rises in temps = more meltwater / deposition
