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" <[email protected]>
To: <[email protected]>; <[email protected]>
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: [email protected]
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: Wednesday, September 09, 2009 12:47 PM
To: [email protected]
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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