[meteorite-list] xenolithic breccia's?

From: Jeff Grossman <jgrossman_at_meteoritecentral.com>
Date: Mon Jul 11 08:19:54 2005
Message-ID: <6.2.1.2.2.20050711081646.01dcb2e8_at_gsvaresm02.er.usgs.gov>

Some of you may enjoy reading this document on the subject of nomenclature
of impactites:

http://www.bgs.ac.uk/scmr/docs/paper_12/scmr_paper_12_1.pdf

jeff

At 04:42 AM 7/11/2005, Jeff Kuyken wrote:
>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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Dr. Jeffrey N. Grossman phone: (703) 648-6184
US Geological Survey fax: (703) 648-6383
954 National Center
Reston, VA 20192, USA
Received on Mon 11 Jul 2005 08:19:47 AM PDT