[meteorite-list] xenolithic breccia's?
Jeff Kuyken
info at meteorites.com.au
Mon Jul 11 04:42:04 EDT 2005
Maybe this will help but I'm not sure that it works for all examples. I
think this is something that came from the list a few years back back I
can't remember who posted it. If you're out there... speak up! ;-)
Genomict - A mixing of different petrologic stages of same composition (Eg.
L3.8 and L6)
Monomict - A mixing of the same textures and compositions. (Eg. L6 with L6)
Polymict - A mixing of different textures but the same compositions (Eg. L5
light with L6 dark)
Regolith - Mixing of different compositions and/or petrologic stages with a
fine matrix at the surface of an asteroid, or moon, etc. Measurement of
solar radiation is involved to show surface exposure implying multiple
events at surface. (Eg. H3-6)
All here: http://www.meteorites.com.au/glossary.html
And I guess Xenoliths would be something like "clasts or inclusions which
are unrelated to the host matrix/material".
Cheers,
Jeff Kuyken
I.M.C.A. #3085
www.meteorites.com.au
----- Original Message -----
From: Norm Lehrman
To: Walter Branch ; met list
Sent: Monday, July 11, 2005 12:04 PM
Subject: Re: [meteorite-list] xenolithic breccia's?
All,
Maybe someone can elucidate on the terms specifically
as they are used in meteorites, but in geology
"polymict" implies varied clast composition ("poly" =
many), while "xenolith" (= foreign rock), implies
clasts from an external source.
Cheers,
Norm
(http://tektitesource.com)
--- Walter Branch <branchw at bellsouth.net> wrote:
> What is the difference between a polymict breccia
> and xenolithic breccia?
>
> -Walter Branch
>
>
> ---------------------------------------------
> ----- Original Message -----
> From: "Darren Garrison" <cynapse at charter.net>
> To: "met list" <meteorite-list at meteoritecentral.com>
> Sent: Sunday, July 10, 2005 9:06 PM
> Subject: Re: [meteorite-list] xenolithic breccia's?
>
>
> On Sun, 10 Jul 2005 17:28:34 -0700, "Tom Knudson"
> <peregrineflier at npgcable.com> wrote:
>
> >Hello good people of the list!!! Sure is slow
> today!!! So, what is a
> >xenolithic breccia? What meteorites are considered
> a xenolithic breccia?
>
> http://en.wikipedia.org/wiki/Xenolith
>
> http://en.wikipedia.org/wiki/Breccia
>
>
> >On Google, I only find Ghubara, but that can't be
> the only one.
>
> One of my favorites was just mentioned a few days
> back-- NWA 3119
>
> http://www.meteorites.com.au/features/nwa3119.html
>
> and my much more modest piece
>
>
http://webpages.charter.net/garrison6328/nwa3119_both.jpg
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