[meteorite-list] Chondritic parent bodies

From: Alan Rubin <aerubin_at_meteoritecentral.com>
Date: Wed, 9 Sep 2009 11:37:43 -0700
Message-ID: <DEE9EE95CC2B4E38BB0ABDCA21125120_at_SINOITE>

John Wasson and I classified some meteorites as L/LL because we were
uncertain of their proper classification. Typical for these meteories, some
properties indicate L, some indicate LL, and some could be truly
intermediate between the established ranges. This may mean that they are
anomalous L chondrites, anomalous LL chondrites or, possibly, from a
different parent body entirely that is intermediate in its properties. Of
course, some could be L, some could be LL and some could be intermediate.
One way to decide would be to accumulate a lot of data on these guys and see
if they have a cosmic-ray age peak that matches one of the main ones for L
or LL or if it is unique. This remains to be done.
Alan


----- Original Message -----
From: "Dave Gheesling" <dave at fallingrocks.com>
To: <bernd.pauli at paulinet.de>; <Meteorite-list at meteoritecentral.com>
Sent: Wednesday, September 09, 2009 11:15 AM
Subject: Re: [meteorite-list] Chondritic parent bodies


> Bernd, Alan, and List,
> Thank you both for the diplomatic and informative responses. While we're
> on
> the subject, might one of you (or anyone else) expand on, say, the L/LL6
> classification designation? Holbrook was recently moved from an L6 to
> such
> a classification, and I have a few others in my collection which are not
> breccias (and presumably are entirely from one parent body and not two)
> but
> yet have this classification assigned to them...which, "by definition,"
> would imply connection with both the L and LL parent bodies, presumably
> anyway.
> Thanks, and all best,
> Dave
> www.fallingrocks.com
>
> -----Original Message-----
> From: meteorite-list-bounces at meteoritecentral.com
> [mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of
> bernd.pauli at paulinet.de
> Sent: Wednesday, September 09, 2009 12:47 PM
> To: Meteorite-list at meteoritecentral.com
> Subject: [meteorite-list] Chondritic parent bodies
>
> Hello Dave, Alan, and List,
>
> Here is a paper that may be of interest with regard to LL chondrite parent
> bodies:
>
> Dixon E.T., Bogard D.D. and Garrison D.H. (2002) 40Ar-39Ar Chronology of
> LL
> Chondrites (Lunar and Planetary Science XXXIII, 1114.pdf).
>
> They even discuss *three* models:
>
> 1. The onion-shell model
> 2. The rubble-pile model
> 3. The re-assembly model
>
>
> Best wishes,
>
> Bernd
>
>
>
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Received on Wed 09 Sep 2009 02:37:43 PM PDT