[meteorite-list] Chelyabinsk - IMB or SMB? The nomenclature of Melts.

From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Wed, 24 Apr 2013 21:00:59 -0400
Message-ID: <CAKBPJW-L6GRmUJPRs7NHc4-WWasGG2FJOsHzWGC3irt5a2cn8g_at_mail.gmail.com>

Hi Mike and List,

Ok, so these nodules were present in the meteoroid before it fell to
Earth. The body contained these nodules, and they separated from the
body during the mid-air explosions. That is where I was confused. I
thought that the nodules were created during the explosions.

Stupid question now - how can we tell if the nodules were present
before the explosions or were created during the explosions?

Best regards,

MikeG



On 4/24/13, Michael Farmer <mike at meteoriteguy.com> wrote:
> The meteorite is an IMB. These nodules being harder than the matrix were
> separated into individuals when the meteorite exploded.
> They are like thousands of Cat Mountains.
> Michael Farmer
>
> Sent from my iPhone
>
> On Apr 25, 2013, at 6:41 AM, "Galactic Stone & Ironworks"
> <meteoritemike at gmail.com> wrote:
>
>> Hi List,
>>
>> We keep hearing about the "IMB nodules" that have been recovered -
>> these have an all-black lithology with no chondrules, shock veins, or
>> grey matrix material.
>>
>> However, these nodules were not created on impact. Had there been
>> such an impact, we would have a visible crater and the nodules would
>> be located in a radius directly adjacent to the crater amidst the
>> ejecta. Instead, these nodules were apparently created during the
>> fragmentation events that took place while the body was still in
>> atmospheric flight.
>>
>> If this is true, shouldn't these nodules be called "shock melt" and
>> not "impact melt" ?
>>
>> Is there any distinction in the official nomenclature between an
>> impact melt and a shock melt?
>>
>> Is it correct to continue using IMB in reference to these Chelyabinsk
>> specimens?
>>
>> Best regards,
>>
>> MikeG
>>
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Received on Wed 24 Apr 2013 09:00:59 PM PDT