Fw: [meteorite-list] The Massive, Sudbury Impact Structure

From: Rob Wesel <*Nakhladog_at_meteoritecentral.com*> Date: Thu Apr 22 10:00:04 2004 Message-ID: <004001c2212c$5ffa9310$4e9fe70c_at_GOLIATH> · Nakhladog_at_meteoritecentral.com

--
Rob Wesel
------------------
We are the music makers...and we are the dreamers of the dreams.
Willy Wonka, 1971
----- Original Message -----
From: "robert szep" <zeprox_at_albedo.net>
To: "Rob Wesel" <Nakhladog_at_attbi.com>
Sent: Sunday, June 30, 2002 11:38 PM
Subject: Re: [meteorite-list] The Massive, Sudbury Impact Structure
> Hi Rob, Yes, feel free to post this reply...
>
>
> I am a list member BUT when I post anything to the list it simply does not
> show up. This is quite discouraging so I just stopped sending stuff to the
> list. I did a great little story about the Southampton Pallasite, I sent
it
> to the list hours before the big news of it's discovery started flooding
the
> list. I had a major inside scoop and it ended up in cyber-limbo. ANYWAY,
now
> about Sudbury...
>
> There is a large boulder of Black Onaping near the Kentland Structure in
> Indiana. It was carried there by glaciers. There are likely target rock
> fragments on the MOON!
>
> Much of the original crater has indeed been weathered away and what is
> presently seen at the surface is basically the bottom of what was once a
> much larger and deeper bowl shape structure.
>
> I have personally sampled specimens of impact melt-glass displaying
obvious
> glacial striation features and then sampled the same type of material only
a
> few feet away with absolutely no evidence of glacial activity visable on
the
> surface of the specimen.
>
> As for the small metallic fragments in the fallback breccia and droplets
in
> the melt-glass, these haven't rusted away because they were 'sealed'
within
> the host rock. When sawing nuggets to make slices the sawblade quite often
> cuts through some very interesting inclusions of metal - more than just
> grains - and dark green micro tektites often rimmed by metal grains and
> solidified dust.
>
> I  have also observed what appears to be a breccia within a breccia within
> another breccia in some slices. Interesting and baffling at the same time.
>
> The most intreaging material is found in what is left of the original
crater
> wall... at the higher elevations.
>
> Best regards.
>
>
>
> > ----- Original Message -----
> > From: "Mark Fox" <unclefireballmtf_at_yahoo.com>
> > To: <meteorite-list_at_meteoritecentral.com>
> > Sent: Sunday, June 30, 2002 12:55 PM
> > Subject: [meteorite-list] The Massive, Sudbury Impact Structure
> >
> >
> > > June 30, 2002
> > >
> > > Greetings Meteorite Enthusiasts!
> > >
> > > I have recently read about the famous Sudbury impact
> > > structure, located in Ontario, Canada.  It is the
> > > second largest impact listed in the, "Rocks From
> > > Space" crater list ---a gargantuan 155 miles wide!
> > > It is also listed as being visible from the surface
> > > and is commonly attributed to be roughly 1.87 billion
> > > years old, making it the second oldest impact recorded
> > > to date!  Also astonishing is the fact that metallic
> > > iron nickel grains have been found in some of the
> > > impact breccias associated with the massive
> > > devastation it caused.  These grains are thought to
> > > be pieces from the actual impactor!  Amazing!
> > >
> > > Thus, knowing this, some gnawing questions have come
> > > up.
> > >
> > > Firstly, where has the farthest piece of Sudbury
> > > impact breccia been found?  Could there be pieces
> > > blown away as far as the Lower Peninsula of Michigan
> > > or dragged there by glaciers?
> > >
> > > Also, doesn't it seem rather odd for such a supposedly
> > > ancient crater as the Sudbury Structure to be still
> > > visible from the surface today?  If it is indeed as
> > > old as it has been assumed, then it would have had to
> > > survive the erosion caused by the ancient shallow seas
> > > that likely covered the area for many, many years.
> > > Then of course, it would have had to likewise endure
> > > the glaciers that probably swept over the area with
> > > their demolishing movements.  It seems hard to imagine
> > > that such an impact structure could be as well
> > > preserved as it sounds like today, including being
> > > discernible from the ground.
> > >
> > > Lastly, this brings up another question, one
> > > concerning the iron-nickel grains.   Wouldn't one
> > > think that most of it should have rusted away during
> > > the length of time that they are said to have been
> > > here, including possibly being submerged in salt
> > > water?  I am mainly addressing the grains located near
> > > the crater, at the earth's surface (that is, if there
> > > are any found there).
> > >
> > > Please correct me if I'm wrong with any of the above
> > > statements!
> > >
> > > Long strewn fields!
> > >
> > > Mark Fox
> > > Newaygo, MI USA
> > >
> > > __________________________________________________
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>
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