[meteorite-list] Re: Fr. Steve Arnold - The Brenham Story

From: Jeff Kuyken <info_at_meteoritecentral.com>
Date: Fri Nov 18 01:55:54 2005
Message-ID: <002501c5ec0d$1e5b5840$55558b90_at_mandin4f89ypwu>

G'day Darren, Geoff & all,

>Anyway, you're right, it is kinda similar in that respect to Seymchan.

Don't forget Glorieta Mountain. The transitional slices from that find are
stunning. And there are quite a few siderites from that find too. In fact if
all Pallasites had a large enough TKW which was subsequently recovered, I
would probably not be surprised to find siderites among them all.

>However you look at it, it's pretty cool to find an iron and a pallasite in
the same field!

Yep. That's also why I like the Pigick
(http://www.meteorites.com.au/favourite/march2005.html) find from my state
even more. Eight individuals were found while ploughing a field and by sheer
chance alone two other unrelated Individuals were also turned up. These two
became known as the Rainbow carbonaceous CO3.2 chondrite.

Cheers,

Jeff


----- Original Message -----
From: Notkin
To: Meteorite List
Sent: Friday, November 18, 2005 5:36 PM
Subject: [meteorite-list] Re: Fr. Steve Arnold - The Brenham Story


Darren posted:

> So, is this likely a seperate fall found in the same strewnfeild or a
> piece of Brenham? Are there
> other Brenham pieces that are all iron?


Hi Darren:

Good question. I believe there are several known pure Brenham irons
(i.e with absolutely no olivine). I'm sure Steve would answer himself
if he dropped that annoying AOL so he could post to the List : )

One iron was found quite close to the big pallasite. IMO they are
definitely from the same fall -- they were at similar depths, and show
comparable weathering. I discussed this with Steve at some length while
we were hunting.

I once saw a Brenham that had been prepared by Allan Lang. It was a
beautiful big slice that was about 95% iron with a little bit of
olivine right at the edge. So, it would seem that the original intact
Brenham mass might have incorporated a zone where an all-metal matrix
met a pallasitic area.

I wondered how it could be that you'd find an all-iron meteorite next
to an all-pallasite meteorite, and clever Steve pointed out that the
pallasitic masses are probably much more fragile. Therefore, is it
reasonable to assume that if/when the main mass exploded, in flight and
under atmospheric pressure, it might have split along the
iron/pallasite boundary -- thereby delivering to us some pallasites,
some irons, and maybe some mixed?

Anyway, you're right, it is kinda similar in that respect to Seymchan.

However you look at it, it's pretty cool to find an iron and a
pallasite in the same field!


Best,

Geoff N.

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Received on Fri 18 Nov 2005 01:55:49 AM PST