what about the F chonderite inclusions in aubrites, specifically cumberland
falls - is that a xenolith of unrelated material, or is it unmelted
precursor material?
and dont forget chondrules in polymict ureilites! :)
From: [EMAIL PROTECTED]
To: "stan ." <[EMAIL PROTECTED]>,
[EMAIL PROTECTED],[EMAIL PROTECTED],
[email protected]
Subject: Re: [meteorite-list] impact melts
Date: Wed, 06 Apr 2005 20:21:57 +0000
Stan and others,
Acapulcoites, Brachinites, Lodranites, and Winonaites have been thought of
as being "primitive" achondrites that may have chondrules, especially
acapulcoites. I've always thought of these as being "tweeners" in between
chondrites and achondrites....differentiated a lot, but not quite absent of
chondritic characteristics like remnant chondrules. Their age signature is
still from longggg ago.
I agree (IMHO) with others to say that impact melting alone does not make
an achondrite. It is primarily a function of differentiation.
John
-------------- Original message from "stan ." <[EMAIL PROTECTED]>:
--------------
>
>
> >
> >Achondrites - (a-kon-drites) meteorites whose composition has been
> >significantly altered from the early/primative chondritic material.
> >Chondrules are not present.
>
> you cant say that because some achonderites contain chondrules - i have
an
> end cut of dhofar 125, an acapulcoite that has a chondrule or two
visable
>
>
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