Fred, Maurizio, Graham,
On the contrary, it is generally accepted the the vast majority of the
jagged shrapnel fragments found were formed when the larger masses
came into direct contact with permafrost and bedrock. Such is said by
Buchwald, Krinov, and..., well, to be frank, I've gone through
Hi Fred, List,
How does that explain all the shrapnel found in the sides of the trees or holes
straight through standing trees? Surely shrapnel was produced both on the way
down and on impact?
I have pieces that seem to have no sign of ablation, just lots of shear lines.
Graham, Uk
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- Original Message -
From: ensorama...@ntlworld.com
To: meteorite-list@meteoritecentral.com; debf...@att.net; Maurizio
Eltri maurizio.el...@libero.it
Sent: Tuesday, November 17, 2009 11:09 PM
Subject: Re: [meteorite-list] Info on Sikhote Alin's shrapnel
Hi
Hello Graham, All,
On the contrary, the typical pieces of shrapnel found were in my
opinion formed exclusively on impact - the force of the explosive
impacts was certainly adequate to drive sizable fragments through
practically any tree (well, let's exclude things like Sequoias...).
There are
I was under the impression (read it somewhere) that most modern=collected
Sikhote-Alin fragments are rusty and are cleaned in rock tumblers. If so, could
not that dull/round formerly sharp edges and make them look melted?
__
Darren, I just looked at 119 individual pieces of shrapnel fragments under a
microscope. They are rather small and range in size from 30 grams to less than
one gram. It looks to me that every one of them shows some feature of melting.
many have roll over rims, melted grooves, fusion crust
Maurizio, Graham, Jeff, Fred, Darren, All,
I think Darren's hit on the fact of it - as I noted in my original post:
Many batches of shrapnel do appear to be somewhat ablated due to the
method by which they have been cleaned (tumbling with ball bearings
tends to wear corners down and gives the
Amazing piece with bubbles Jason,
Been trying to figure out how that could happen. It does not look like it
happened due to melt during the fall but more like a feature from pre-entry,
exposed after fragmenting.
What are your thoughts...I can't think of any other irons with bubbles.
Regards
Hello Graham, All,
Well, there's always Albion, though that's quite a different beast. I
believe the druzy vugs found in that are accepted to be a product of
impact melting, as per Buchwald.
By the look of the specimen, I think it's safe to say that the bubbles
are the result of an accumulation
Hi all,
I ask to those who are more experienced
than me,clarification about Sikhote Alin's
splinters formation.
In my opinion there can be two ways to
justify the origin of the fragments found in
the vicinity of the largest craters,
1) The kinetic energy released at the contact
surfaces of
I did not know heat was needed at all to form shrapnel...surely it is just due
to shearing of fragments from the dramatic collisions of fragments on impact or
during exposive events on the way down that did not leave enough time for
ablation?
Graham UK
Maurizio Eltri
List, I have searched many Kilos of SA shrapnel without ever finding ONE
without some surface melting. From what I have seen shrapnel is ALL air
shredding with subsequent atmospheric frictional melting.
Cheers, Fred Olsen
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