[meteorite-list] Lunar/Martian controversy

From: j.divelbiss_at_att.net <j.divelbiss_at_meteoritecentral.com>
Date: Thu Apr 22 10:18:02 2004
Message-ID: <122020031925.19114.7d3a_at_att.net>

Thanx Eric,

If our max 19 million year CRE ages are correct relative to the carbon
dating, then materials from the ancient impacts are not around, or at least
in space or evident on Earth. Maybe on other planets...maybe.

Q: Does this imply that the Asteroid Belt is "out of bounds" for this
material, and that material released from the inner planets and moons will
only stick around for 20 or 30 million years before being filtered
out/vacuumed up by the the planets and moons inside the Belt? Cool concept
if so!!

Q: Do we think that it is possible for the moon's impact ejecta into space to
escape Earth's gravity? I would think not, or very-very little.

Cautious this time,

John


 
> In a message dated 12/20/2003 8:24:13 AM US Mountain Standard Time,
> j.divelbiss_at_att.net writes:
>
> << Q: When were most space floaters from Mars and the Moon created?
> A: A couple billions of years ago when most of the planetary bombardments
> were occurring. >>
>
> Actually they are much, much younger. The CRE ages (time floating in
> space) for martian meteorites range from 19.8 million years to less than 1
> million years with a group at 10-12 million years and most less than 2 million
> years. The lunar meteorites are practically instantaneous in comparison.
> So the difference is likely the sampling time frame. If the decay to
> being unrecognizable is 50,000 years on earth, then the lunar meteorites are
> resulting from significant impacts during that timeframe. The martian sampling
> timeframe is about 400 times longer giving much more time for significant
> impacts even if they have to be larger impacts. In addition an impact on mars
> will
> continue to drop meteorites for millions of years until they hit a planet,
> burn up in the sun, or get tossed out of the solar system. With lunar
> meteorites it is a shotgun blast and wait for the next impact.
> The longer time frame for Mars and the smaller impacts necessary for the
> moon evidently even things out.
>
> Eric Olson
> ELKK Meteorites
> http://www.star-bits.com
>
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Received on Sat 20 Dec 2003 02:25:00 PM PST