[meteorite-list] Stony-iron Parent Bodies

From: Robert Verish <bolidechaser_at_meteoritecentral.com>
Date: Thu Apr 22 09:43:33 2004
Message-ID: <20010721185032.75429.qmail_at_web10402.mail.yahoo.com>

Speaking of "unique parent bodies", what is the
general consensus on the number of parent bodies to
account for all the various stony-irons? Is this new
classification scheme developing because of new
pairings?

Bob V.

---------- Original Message ---------------
Subject: Re: [meteorite-list] Mt. Egerton

David Weir dgweir_at_earthlink.net
Sat, 21 Jul 2001 14:21:53 -0400

Hello Dave and Mike,

I think it's also practical to rethink the terms
chondrite and achondrite as useful classification
parameters. We now have the achondrite acapulcoite NWA
725 (Tissemoumine) which has distinct chondrules,
along with relict chondrules in Monument Draw. And
there are
a few carbonaceous chondrites that have experienced
complete aqueous alteration of their chondrules to the
point of obliteration (an aqueous achondrite?). And
what about chondrites that have not experienced
igneous conditions, but instead have been totally
recrystallized by the heat of impact, sometimes
classified as petrologic grade 7 (an impact
achondrite?).

But just as we can choose to use the relatively
general term mesosiderite, it's really a matter of how
detailed the information is that you wish to convey. A
simple division into stones, irons, and stony-irons
may suffice for some situations, but even the option
to
split the classification scheme into unique parent
bodies is becoming more possible each year.

Regards,

David


__________________________________________________
Do You Yahoo!?
Make international calls for as low as $.04/minute with Yahoo! Messenger
http://phonecard.yahoo.com/
Received on Sat 21 Jul 2001 02:50:32 PM PDT