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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
January 25, 2021 • 22:36 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
Explain flow of glacier. please. especially with respect to plastic flow at bottom. what he means to that
Cguiariuues pIOSeL 1 u pa reguiaries presem In a moving glacier two zones can be identified: (1) zone of flow, and ti) zone of fracture. The "zone of flow" is found in the deeper layers of ice. Here the weight of the overlying ice is great, and the ice behaves plastically
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Sajan sarthak
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weight jyada he isliye pressure he to niche break nahi kar raha to plastic/ ductile behave kar raha he
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Saurabh 1 Best Answer
Glacier is basically a downward moving body mostly consists of ice. Glacier has brittle nature at the top or on the surface which undergoes brittle deformation (best example is your crevasse form due to shearing or some tensional forces acting on the brittle ice). While as one moves down or in subsurface condition, they behaves as a ductile material under some pressure, ductile flow is seen most probably. Go through the figure attached it will help you.
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ductile and plastic are nearly same ?...as they are saying glacier move as plastic movement.?
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Actually materials that have a fair amount of plastic deformation before breaking are said to be ductile. While the brittle one actually breaks. So in all plastic deformation can be somewhat found prominent in ductile materials. In short quite synonymous
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See this figure for more details..
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Sajan sarthak
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GLACIER when moves its more like layers or sheets slideupon each other as the lower layer is very deeper inside it's having melted and liquid mixed layers so when they start sliding doesn't break and slide like VISCOUS flow. while the upper layered breaks and crevacess gets often created on them.
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Saurabh 1
Gurmeet, kindly mark other answers. I think you forgot to mark them.
ok sir.yahan muje ek bat bta do....how sole marks tells us about the paleocurrent direction.
Well let's take example of flute cast. In this case as you have seen it is formed by scouring leading to deposition of sediments in the erosional prone part hence filling of sediments leads to flute like structure and cast defines the sediments filled. See in the diagram , the short steep side will point upstream and the long tapered side points downstream . See the arrow shows the direction of current.
Also see this ...
opposite to as case of dunes...in the flow
uper wali fig me direction sahi hai
as windwards side generally gentle & lee side steep hota...yahan ulta hai?
like my message so that i get notification
See these two, i guess in these figures flow or current direction is given correctly.
can you record this on Instagram.. please.
Ok bhai kar dunga.... Aur koi doubt kisi question me?
Any doubt in other questions i answered today