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Re: Orgueil and Comets
Hello List and Walter:
Orgueil and most C1 and C2-chondrites are thought to be of cometary origin. This
is not only due the high water content (~20%?) but also the low temperature
aqueous mineral phases to alter (i.e clay minerals). This is probably caused by
the passage of the comet close to the sun where it heats up, ice melts and alters
the minerals. However, most of that water should be evaporated when it passes near
the sun. The C1 and C2 chondrites also appear to resemble the asteroid Ceres in
the spectral patterns. So it is possible that Ceres is a burnt out comet! Cool
eh?!?!
Best,
Matt
--
Matt Morgan
Mile High Meteorites
http://www.mhmeteorites.com
P.O.Box 151293
Lakewood, CO 80215-9293
"For a geologist, life is a field trip"
WBranchsb@aol.com wrote:
> Hello Everyone,
>
> I was just wondering what the general consensus of the list membership is with
> regard to Orgueil being cometary in origin? Other than it's high water
> content, are there factors or characteristics which would suggest that
> Orgueil's parent body was a comet?
>
> Are there any other finds or falls which are thought to be of cometary origin?
> Are all CIs thought to be of cometary origin?
>
> -Walter
>
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