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Author Topic: minerals to rocks, rocks to soil, but how?  (Read 3570 times)

paul.fr

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minerals to rocks, rocks to soil, but how?
« on: 20/08/2007 16:26:56 »
i hear that minerals will eventually become rocks, which inturn become soil. but how?


 

Offline Bass

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minerals to rocks, rocks to soil, but how?
« Reply #1 on: 20/08/2007 17:05:55 »
minerals + heat and pressure = rocks
rocks + erosion = soils
 

Offline pete_inthehills

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minerals to rocks, rocks to soil, but how?
« Reply #2 on: 21/08/2007 12:49:31 »
I like to think of this not as two seperate equations, but one big cyclical one.

rocks + erosion + organic matter = soil; soil + heat + pressure = rocks; rocks + erosion....round and round and round

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Offline _Stefan_

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minerals to rocks, rocks to soil, but how?
« Reply #3 on: 21/08/2007 13:39:46 »
Can rock be formed by pressure without heat? Like the different layers of soil and rock you find as you dig deep deep down?
 

Offline eric l

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minerals to rocks, rocks to soil, but how?
« Reply #4 on: 21/08/2007 14:32:41 »
Can rock be formed by pressure without heat? Like the different layers of soil and rock you find as you dig deep deep down?
I remember being shown formations consisting of a kind of natural concrete. 
Wikipedia has an article on such agglomerates :  http://en.wikipedia.org/wiki/Clastic_rock
 

Offline pete_inthehills

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minerals to rocks, rocks to soil, but how?
« Reply #5 on: 21/08/2007 22:14:40 »
often the pressure comes from burial and that causes heat as well, but I do remember something about pressure alone causing minerals to bond.  It was something like pressure melting or some such.  And there is the usual biological/chemical factors.  Oolites are a good example.  A grain of sand rolls around on a lime mud sea floor, gets a coating of lime mud and they eventually chemically bond to make an oolite.  So yeah, you don't need heat, but they often work together.

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minerals to rocks, rocks to soil, but how?
« Reply #5 on: 21/08/2007 22:14:40 »

 

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