Re: Where did the extra mass come from?


"Florian" <auxotectonics_deletethis@xxxxxxxxxxxxxxxxxx> wrote in message
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George <George@xxxxxxxxxx> wrote:

"Florian" <auxotectonics_deletethis@xxxxxxxxxxxxxxxxxx> wrote in message
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Of course they do!!! You stupidly think thay sink because there is not
enough water in your glass.
Put more water and you'll see them floating.

Why are the ice cubes not standing way up out of the water? Why are they
sinking into the water all the way to the bottom?

They do not sink idiot!
They float even if they are crowded in you glass. Remove one icecube and
you will see that the last icecube do not touch the bottom of the glass
no more, because ice is less dense than water and FLOAT!

I'm not arguing that the ice is more dense than the water. Of course it is
not. It is less dense. And that's the point. It can be made to sink all
the way to the bottom of the glass despite being less dense ***exactly***
because the weight of the additional ice overcomes the buoyancy. And this
is exactly what happens at subduction zones. In fact, it is what happens at
all thrust zones. The thrusting in the Himalayas has caused the base of
those mountains to reach deep into the Earth (at least 75km).

http://www.nature.com/nature/journal/v435/n7046/full/nature03678.html

Now, slabs are not "crowded" in the mantle. So if they are really less
dense than the mantle they won't sink. I order to sink they must be
denser. Period.

If you will check my posts you will note that I have stated a number of
times, but particularly in detail last night that after the subducted slab
undergoes partial melting, the residual slab IS denser because it contains
mostly dense refractory minerals. But the less dense oceanic slab got down
to where it can undergo partial melting in the first place because of both
vertical and horizontal compression as the two plates converge. Period.

George


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