[meteorite-list] Chondritic parent bodies

From: Dave Gheesling <dave_at_meteoritecentral.com>
Date: Wed, 9 Sep 2009 01:20:35 -0400
Message-ID: <9E13859409384A09B3E1EC2103908A12_at_meteorroom>

PS - Darren has been kind enough to send some great resources along off
list. I can't recall where the notion of separate parent bodies denoted by
alteration first hit my screen, but I'm rather certain it was here on the
list. Having previously assumed three parent bodies (H, L, and amphoterite)
all along, that one hit me by surprise. The rapid movement in meteoritics
must have taken my threshold of assumption with it. Reminiscent of looking
for my sunglasses all over the house last weekend, only to realize the
search was being conducted through them...on my face. Anyway, one of these
days I might know enough to read and actually comprehend more than half the
articles in MAPS, but until then this list is one fantastic resource -- even
for dumb questions (which, at the end of the day, are the ones which aren't
asked). Thanks again, Darren!
DG

-----Original Message-----
From: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Dave
Gheesling
Sent: Tuesday, September 08, 2009 11:40 PM
To: 'Meteorite List'
Subject: [meteorite-list] Chondritic parent bodies

All,
Pete's question re: pallasites reminds me of one I've been meaning to throw
out to the group for a while. I believe that, by definition, L6's come from
one parent body and L5's, say, come from another. It's clear why breccias
might simply be an association of the two. But I've seen cross section
illustrations of hypothetical asteroids more than once which indicate a
transitional progression from L3 material at the exterior/crust through L4,
then L5, and eventually to L6 at the center/core. Presumably this is due to
insulative properties and the like towards the interior which allow more
heat from radioactivity to build up, etc, but this also seems to indicate a
single parent body. I'm sure Sterling & Co. might have a field day with
this one, and I'm looking forward to any responses out there...
Thanks much,
Dave

Dave Gheesling
IMCA #5967
www.fallingrocks.com

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Received on Wed 09 Sep 2009 01:20:35 AM PDT