[meteorite-list] Snow and Mars water and meteorites

From: John Divelbiss <j.divelbiss_at_meteoritecentral.com>
Date: Thu Apr 22 10:18:29 2004
Message-ID: <002401c2da22$e41c5340$0e135a0c_at_0m824>

Pictures I've seen from the rover that was on Mars makes it look like the
typical rocks are weathered to a rusty brown color...like many
olivine/pyroxene (w/iron) rich rocks here on earth.

Can anyone tell me if this is thought to be the case, and do any of the Mars
meteorites found show any signs of weathering from it's existence on Mars?


John


----- Original Message -----
From: "Francis Graham" <francisgraham_at_rocketmail.com>
To: <meteorite-list_at_meteoritecentral.com>
Sent: Friday, February 21, 2003 10:28 AM
Subject: [meteorite-list] Snow and Mars water and meteorites


> Mike Reynolds forwarded an interesting article about
> Snow pack providing the pressure for Mars water to
> exist and form gullies.
> If this is true, since snow (sublimated frost) can
> form anywhere on Mars, there ought to be more gullies
> in the lower elevations (say, the rim of the Hellas
> Basin) than in the higher elevations (Tharsis
> plateau), at similar distances from the equator.
> This is because the pressure on Mars is near the
> Triple Point pressure, and a similar amount of snow in
> either place ought to produce more gullies in the
> place where the air pressure "helps" most.
> There are some assumptions here, and certainly the
> gulley system shows a wide range of ages. One must not
> be too hasty in jumping to conclusions, but a
> superficial glance does show more larger gullies at
> lower elevations. A precise count and control for age
> from crater counts may be helpful.
> Further, there should be some variation in the
> alteration of same-age Martian meteorites originating
> from high elevation on Mars to low elevations. As the
> Morroccans busily increase the sample (and
> non-Morrocans like Mr Verish :), we will see.
>
> Francis Graham
>
>
>
>
> __________________________________________________
> Do you Yahoo!?
> Yahoo! Tax Center - forms, calculators, tips, more
> http://taxes.yahoo.com/
>
> ______________________________________________
> Meteorite-list mailing list
> Meteorite-list_at_meteoritecentral.com
> http://www.pairlist.net/mailman/listinfo/meteorite-list
>
Received on Fri 21 Feb 2003 10:31:29 PM PST