[meteorite-list] Cometary meteorites

[E.P. Grondine]

Hi Larry - 

And when I started on this list there were no major differentiated parent bodies for other meteorites (following McSween), and now we have what, at least five?

I suppose that if we knew what comets were, then there wouldn't be any need to spend any money finding out what they are. And then there is that tricky problem of the source for C, B, G (and maybe D) asteroids.

E.P.

--- On Tue, 11/23/10, lebofsky at lpl.arizona.edu <lebofsky at lpl.arizona.edu> wrote:

> From: lebofsky at lpl.arizona.edu <lebofsky at lpl.arizona.edu>
> Subject: Re: [meteorite-list] Cometary meteorites
> To: "E.P. Grondine" <epgrondine at yahoo.com>
> Cc: warnerem at astro.umd.edu, meteorite-list at meteoritecentral.com
> Date: Tuesday, November 23, 2010, 3:48 PM
> Hi:
> 
> I have said this to you before that there is about zero
> evidence that
> carbonaceous chondrites are from comets. There is only
> minimal evidence
> that there are hydrated silicates in comets and at least
> the CI and CM CCs
> very much aqueously altered and are consistent with an
> origin from C, B,
> and G (and maybe D) asteroids.
> 
> Larry
> 
> > Hello Elizabeth, all -
> >
> > The general informal consensus within the meteorite
> community has been
> > that carbonaceous meteorites are cometary in origin.
> That being the case,
> > a few questions:
> > 1) At what compression/temperature will CO2 dissociate
> into Carbon and
> > Oxygen?
> > 2) Will Epoxi provide fine spectra data for trace
> elements such as calcium
> > and aluminum? Platinum Group Elements?
> >
> > E.P. Grondine
> > Man and Impact in the Americas
> >
> >
> >
> >
> >
> > ______________________________________________
> > Visit the Archives at
> > http://www.meteoritecentral.com/mailing-list-archives.html
> > Meteorite-list mailing list
> > Meteorite-list at meteoritecentral.com
> > http://six.pairlist.net/mailman/listinfo/meteorite-list
> >
> 
> 
>