[meteorite-list] Fusion crusts on stony meteorites

From: Kashuba <mary.kashuba_at_meteoritecentral.com>
Date: Thu, 22 Mar 2007 22:05:51 -0700
Message-ID: <007f01c76d08$edee93b0$c9cbbb10$_at_kashuba@verizon.net>

Michael, Darren, Jim and list,

I agree with Jim on this. My slice of the same stone has fragments set in a
clearly bubbly melt. I suggest that this accumulated on the back side of
the stone during oriented flight. Check out my pictures:

http://www.johnkashuba.com/Pages/Meteorite%20Pages/Pictures/NWA2826LL5.htm


Regards,

- John

John Kashuba
Ontario, California

-----Original Message-----
From: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of
jbaxter112 at pol.net
Sent: Thursday, March 22, 2007 9:16 PM
To: meteoriteguy at yahoo.com
Cc: Meteorite-list at meteoritecentral.com
Subject: Re: [meteorite-list] Fusion crusts on stony meteorites

Hi Mike and Darren,

I probably would have had that response too without the benefit of turning
these over in my hands and looking at them in 3 dimensions. I'm 99% sure
that if you held these in your hands, and especially if you looked at them
under the microscope, you would conclude the black areas are crust. This
scan of reverse side of the 28 gram slide may be more convincing:

http://img.photobucket.com/albums/v614/CaneySprings/NWA2826LL528gmMarcinCima
lareversecl.jpg

I also made an oblique photo of the other slice which shows the contiguity
of the area with the fragments(lower right hand corner of the top photo,
lower hand corner left of the lower photo) with the rest of the crust.

http://img.photobucket.com/albums/v614/CaneySprings/NWA282648gmobliqueview-1
.jpg

http://img.photobucket.com/albums/v614/CaneySprings/NWA282648gmobliqueviewre
verse-1.jpg

However, I'm sure I have about a thousandth the expertise of either of you
so I could well be off base.

Best wishes,
Jim

> I agree, I dont think that it is fusion crust, more
> likely a brecciated section on the edge of the
> meteorite.
> Michael Farmer
> --- Darren Garrison <cynapse at charter.net> wrote:
>
>> On Thu, 22 Mar 2007 21:58:51 -0400 (EDT), you wrote:
>>
>> >Hello Berndt et al.,
>> >
>> >I thought you and the list members might find
>> interesting a phenomenon
>> >that was shown to me by Marcin Cimala. In cutting
>> an LL5 he found areas
>> >where thick crust had built up and actually
>> incorporated within the crust
>> >small angular fragments of relatively unaltered
>> meteorite. Here are scans
>> >of a slice I obtained from Marcin:
>> >
>>
>>http://img.photobucket.com/albums/v614/CaneySprings/NWA2826LL528gmMarcinCi
mala.jpg
>> >
>>
>>http://img.photobucket.com/albums/v614/CaneySprings/NWA2826LL528gmMarcinCi
malacloseup.jpg
>> >
>> >I assume that these fragments were dislodged late
>> in flight while the
>> >crust was still liquid but too late to be melted or
>> thermally altered.
>>
>> I would think that is just a darker clast in the
>> rock that happened to be only
>> on the outer edge of that slice.
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Received on Fri 23 Mar 2007 01:05:51 AM PDT