Re: 3-D model shows big body of water in Earth's mantle


Jonathan wrote:
"George" <george@xxxxxxxxxxxxxxx> wrote in message
news:wqczh.2713$B8.876@xxxxxxxxxxxxxxxxxxxxxxxxx
Go to the link to view the graphics:

http://www.physorg.com/news90171847.html


Previous predictions calculated that a cold ocean slab sinking into the
earth at 1,200 to 1,4000 kilometers beneath the surface would release
water
in the rock that would escape the rock and rise up to a region above it,
but this was never previously observed.


I'll be damned!
So it's true after all, the earth is hollow!!!


Jules Verne - Journey to the Center of the Earth

"This underground world is lit by electrically charged gas
at the ceiling, and is filled with a very deep subterranean
ocean, surrounded by a rocky coastline covered in petrified
trees and giant mushrooms. The three travellers build
a raft out of trees and set sail on the ocean."
http://en.wikipedia.org/wiki/Journey_to_the_Center_of_the_Earth


I didn't believe Jules Verne then, and I don't believe
this paper now.



Beijing anomaly

"That is exactly what we show here, the exact depth and high attenuation
amounts right above it," Wysession said. "I call it the Beijing anomaly.
Water inside the rock goes down with the sinking slab and it's quite cold,
but it heats up the deeper it goes, and the rock eventually becomes
unstable and loses its water. The water then rises up into the overlying
region, which becomes saturated with water.

"If you combine the volume of this anomaly with the fact that the rock can
hold up to about 0.1 percent of water, that works out to be about an
Arctic
Ocean's worth of water."

In recent years, seismologists have become excited at the possibility of a
feature like the Beijing anomaly. The availability of vast amounts of
digital seismograms made possible the discovery by Wysession and Lawrence,
who wrote many thousands of lines of computer codes to do the analyses.

Seventy percent of the earth is covered by water, which is very important
for the earth's geology, serving as a lubricant that allows efficient
convection and plate tectonics and the continental collisions that form
mountains.

"Water is like a lubricant, constantly oiling the machine of mantle
convection which then drives plate tectonics and causes the continents to
move about Earth's surface," Wysession said. "Look at our sister planet,
Venus. It is very hot and dry inside Venus, and Venus has no plate
tectonics. All the water probably boiled off, and without water, there are
no plates. The system is locked up, like a rusty Tin Man with no oil."



Yup, ..you can't keep a good rock down. It will arise in some form or
other - particularly if it's dense, like oceanic crust. Two thirds
of the Earth's surface testify to this rubbery bounce quality of
mantle material which has sprung upwards through continental crust

Unless of course it happens to meet a piece of continental lithosphere
which will push it down the gurgler. The continental lithosphere
poses a threat to the mantle everywhere, pushing it back down where it
came from wherever it encounters it. Makes you wonder how, with such
efficacy of push-down, the mantle ever managed to push its way up in
the first place and break through

Well, it makes me wonder anyway. I don't see much other evidence of
wondering around here though - only reading. I wonder if there's a
book somewhere would tell me. All I learn thus far is that descending
slabs (pushed down by the continents) create the dynamics that make
the mantle burst through and break the crust up. That is, just by
sitting there, doing absolutely nothing but just innocently sitting
there, it crreates the dynamics to break itself up. Just goes to
show, ... (something).. (I'm not sure exactly what.) (but it looks
like the Deccan and Ethipian lavas, and those of the Russian Platform
are still waiting to sink back down through it all...) I wonder why
they don't? You'd think with all that grass growing on
them, ..pushing them down,... ........

.

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