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Thread: Life span of a mountain

  1. #1 Life span of a mountain 
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    How many years can a mountain exist before it is washed to the sea?

    seriously.


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  3. #2  
    WYSIWYG Moderator marnixR's Avatar
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    i think we're talking in the order of 100 million years or more
    at first plate movements keep on thickening the zone of mountain building, so that even erosion can't keep up with isostatic upward movements - that's what's going on in the Himalayas

    once plate tectonics is no longer active erosion can start taking its toll, but even then isostatic movements keep pushing the root of the mountain up for a long time to come - after all, the Ural mountains are in the order of 350-400 million years old and are still recognisably a mountain chain


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  4. #3  
    Reptile Dysfunction drowsy turtle's Avatar
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    Just to clarify, most mountains do not move towards the sea. They are eroded over millions of years.

    Some parts of the mountain may never reach the sea. They go on to form cratons; areas of rock billions of years old, usually in the centre of coninents.
    "The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair." ~ Douglas Adams
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    Forum Isotope Bunbury's Avatar
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    The answer my friend is blowin' in the wind. The Ancestral Rockies, the mountain range that existed before the present day Rockies, was washed and blown to the plains after existing for roughly 200 million years. My house now sits on the debris from the Ancestral Rockies.
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  6. #5  
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    How long can a plain exist before it becomes a mountain?

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    Forum Isotope Bunbury's Avatar
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    Quote Originally Posted by free radical
    How long can a plain exist before it becomes a mountain?

    Dammit, what is that bulge under the carpet?
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  8. #7  
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    so basically a couple of hundred million years or so...
    Thanks guys. btw, are you real PhDs, or just internet PhDs? (Just wondering, not trying to insult.)
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  9. #8  
    Reptile Dysfunction drowsy turtle's Avatar
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    Quote Originally Posted by gavinred
    so basically a couple of hundred million years or so...
    Thanks guys. btw, are you real PhDs, or just internet PhDs? (Just wondering, not trying to insult.)
    haha.

    The forum status is based on number of posts. It is in no way related to qualification levels. For proof of this, see my arguements with William McCormick.

    :-D
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  10. #9  
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    Quote Originally Posted by gavinred
    so basically a couple of hundred million years or so...
    Thanks guys. btw, are you real PhDs, or just internet PhDs? (Just wondering, not trying to insult.)
    LOL real PhD trying to write up a manuscript. Too much writer's block. This forum is a mental outlet.
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