G'day Mike,
I asked this very same question about a year ago and got some very good
replies. Here are some of them:
http://six.pairlist.net/pipermail/meteorite-list/2010-March/062685.html
http://six.pairlist.net/pipermail/meteorite-list/2010-March/062688.html
http://six.pairlist.net/pipermail/meteorite-list/2010-March/062729.html
http://six.pairlist.net/pipermail/meteorite-list/2010-March/062736.html
Bernd summarised with the following:
"It is likely that the winonaites cooled faster than the silicates in IAB
irons,
which may have been more deeply buried. This is supported by the metallo-
graphic cooling rates of Winona, 200°C/Myr, and IAB irons, 10-50°C/Myr.
So, maybe these metallographic cooling rates can help make a clear(er)
distinction between the two: Silicated IAB's and winonaites."
Cheers,
Jeff Kuyken
Meteorites Australia
www.meteorites.com.au
Vice President - I.M.C.A. Inc.
www.imca.cc
----- Original Message -----
From: "tett" <t...@rogers.com>
To: <meteorite-list@meteoritecentral.com>
Sent: Saturday, February 26, 2011 10:39 PM
Subject: [meteorite-list] Udei Station vs. NWA4024 winonaite types
List,
When stumbling across an ad for NWA4024 I saw pictures of the meteorite
and immediately thought how similar it looks to Udei Station. Comparing
the pics of NWA4024 and my slices of Udei Station reveal very similar
compositions. However, NWA4024 is classiifed as a winonite where as Udei
Station is classified as an IAB iron.
Further research shows that it is likely Udei Station and other IAB irons
along with Winonites come from the same parent body. My question is,
what is the dividing line between Winonites and IAB's? How does one
decide which group the meteorite should fall? Is it %Fe?
Thanks for any help and
Cheers!
Mike Tettenborn
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