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Re: Water in the solar system - was Re: halite in Monahans
- To: meteorite-list@meteoritecentral.com
- Subject: Re: Water in the solar system - was Re: halite in Monahans
- From: Geoffcin@aol.com
- Date: Wed, 22 Jul 1998 21:25:09 EDT
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In a message dated 98-07-22 12:31:27 EDT, Jim Hurley writes:
<<
It is thought that in the presolar nebula, at about 5 AU, there would be
a slush zone, where temperatures would be cool enough for water-ice to form.
This could be a reason why Jupiter formed there.
The asteroids in the far region of the belt are assumed to have once
contained quite a lot of water and from these we get the CI-type meteorites.
There are some samples of asteroids out there that appear reddish or orange
and we have no known samples of that type of rock - expected to have lots of
organics.
Farther out in the solar system, water mixed with a little ammonia forms
a melt at quite low temperatures and a little pressure. This can cause
the water-based differentiation of the moons of Jupiter and Saturn.
The process is interesting, at a pressure of 2-kbar water mixed with ammonia
can melt in a satellite composed of mixed water-ice and rock. A thin zone
forms
underground where the water becomes liquid and the rock and mud settle
downward.
The region starts to grow and widen. Eventually the surface ruptures - from a
collision event or whatever, and all the water gushed out in a geyser. The
surface
sinks and mixes with the unmelted core. Then the process begins anew.
Eventually
all the rock settles to the core and the water-ice ammonia solution is at the
surface.
>>
Jim,
WOW! These is some of the most astonishing things I've ever read here!
You are saying that the most likely place to look for the water that deposited
the halite in Monahans is in the outer regions by the orbits of Jupiter and
Saturn. This makes good sence to me, as it would explain the complete lack
of similar meteoritic material hitting the earth, as most of that comes from
the asteriod belt and the apollo asteriods.
Regards,
Geoff Cintron
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