[meteorite-list] Monthly Favourite - September 2007

From: Jeff Kuyken <info_at_meteoritecentral.com>
Date: Mon, 17 Sep 2007 19:08:04 +1000
Message-ID: <001d01c7f90a$43a451e0$4001a8c0_at_mandin4f89ypwu>

Hi Bernd,

I'm really glad you threw in your observations on this meteorite and asked
about the DI's. Ironically, I've been meaning to ask you about it actually!
I'm currently building a page on DI's which should hopefully be ready in a
couple of weeks when I have a bit more time. I've been reading through
numerous abstracts from the past 20 odd years and it's been very surprising
as to the possible creation origins for these enigmatic features. And it
seems there are also a number of 'different' types of DI's possible in the
same meteorite.

John Kashuba has even sent me some great pics for my page including a DI in
thin-section. If anyone else has pics of specimens displaying DI's they'd
like to share, I'd certainly appreciate it.

Cheers,

Jeff


----- Original Message -----
From: bernd.pauli at paulinet.de
To: meteorite-list at meteoritecentral.com
Sent: Monday, September 17, 2007 5:33 AM
Subject: Re: [meteorite-list] Monthly Favourite - September 2007


www.meteorites.com.au/favourite/september2007.html


This is surely an awesome CV3 chondrite that is full of surprises
and I am glad I purchased 6 specimens, 4 of which have these DI's.

Of special interest is the DI in Jeff's 1.55-gram complete slice.
Like my 4.97-gram specimen, it shows a comminuted matrix of very
small, distorted chondrules and mineral fragments and a medium-gray
rim that maybe represents shock-melted material. This rim is virtually
devoid of chondrules and only shows tiny mineral debris.

Jeff, have you already emailed Ted Bunch? Does he have some thoughts
on these DI's?

BTW, my 11.51-gram NWA 3118 features one of the most massive CAI's
(9.5 x 4 mm) I've ever seen in any of my carbonaceous chondrites with
the exception of the ones Eric Olsen sold some time ago - NWA 2140 ...
unfortunately not classified yet. One of the pieces from Eric has a CAI
measuring even 9.5 x 7.5 mm!

Another interesting feature of my 11.51-gram slice is that both chondrules
+ massive CAI show what is called "preferred orientation" and almost all
these chondrules are - just like this CAI - slightly or perceptibly oval.

Cheers,

Bernd


To: info at meteorites.com.au
    meteorite-list at meteoritecentral.com

______________________________________________
Meteorite-list mailing list
Meteorite-list at meteoritecentral.com
http://six.pairlist.net/mailman/listinfo/meteorite-list
Received on Mon 17 Sep 2007 05:08:04 AM PDT