Landforms of Glacial Deposition
Castle Creek Glacier (BC Rockies)
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Glacial Deposition: Focus on Push Moraines & Castle Creek Glacier, Exams of Topography
Various landforms of glacial deposition, focusing on seasonal push moraines and their formation at Castle Creek Glacier in the BC Rockies. Topics include ice-marginal and subglacial moraines, flutes, drumlins, and mega-scale glacial lineaments. The document also discusses the differences between seasonal and sustained-advance moraines.
What you will learn
- What is the difference between seasonal push moraines and sustained-advance moraines?
- What are the different types of glacial moraines?
- How are seasonal push moraines formed?
- How are mega-scale glacial lineaments formed?
- What are flutes and drumlins?
Typology: Exams
2021/2022
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Landforms of Glacial Deposition
Castle Creek Glacier (BC Rockies)
Landforms of terrestrial glacial depositional
Ice-marginal Subglacial
Glacial Glaciotectonic* moraines^ Flutes,^ megaflutes
Dump moraines Drumlins
Ablation moraines Rogen moraine
Mega-scale glacial lineaments
Glaciofluvial Outwash fans/plains^ Eskers
Kames, kame terraces
Kame-kettle topography
Glaciotectonic: deformation of sediment or rock by moving ice After Bennett and Glasser, 2009
Seasonal
push
moraines at
Sléttjökull
After Bennett and Glasser, 2009
Fast net recession, low seasonal variation: No seasonal push moraines
Slower net recession or high seasonal variation: Seasonal push moraines
Net advance: No seasonal push moraines
Seasonal push moraines
Castle Creek
glacier –
development
of a push
moraine
M. Beedle, UNBC
M. Beedle, UNBC
Castle Creek
glacier – push
moraine
history
Surge and sustained-advance moraines
Surge-related push moraine in front of Usherbreen, Svalbard, August 1985
Push moraine from the 1980 surge of Eyjabakkajökull, Iceland (Benediktsson, et al., 2009)
Dump moraines
• Supraglacial (and subglacial) material that
accumulates at a stationary margin and is then
deposited by slump and flow processes at the
ice edge
• Dump moraines can form in both frontal and
lateral positions
• Material is not deformed as in glaciotectonic
moraines and is not bedded as in kames
Kruger et al., 2002 http://people.su.se/~iborg/bildarkivet/bildsidor/glac/moran/ib256.htm
- Fig. 9.
- After Bennett and Glasser,
USGS
Debris-covered stranded ice - Athabasca glacier
Mega-lineations
Drumlins
Flutes
spacing
length
spacing
length
length
spacing Typical ranges of spacings and dimensions of flutes, drumlins and mega- lineations
from data in Bennett and Glasser, 2009
width height
width height
width
Dimensions of flutes, drumlins and mega-lineations
Flutes (Brúarjökull, Iceland)
https://notendur.hi.is/oi/bruarjokull_photos.htm