[meteorite-list] Mysterious Circular Structure Near Chemult, Oregon

From: Thaddeus Besedin <endophasy_at_meteoritecentral.com>
Date: Fri, 12 Oct 2007 21:02:24 -0700 (PDT)
Message-ID: <948524.84575.qm_at_web62515.mail.re1.yahoo.com>

 
I'm downloading DOQQ and DEM data from the USGS
seamless server (I was going to make some 3D images of
Mt. Hood for a friend anyway). I'll try to post links
to my images, including a simple profile analysis and
vertically exaggerated 3D images. I hope that the data
is available in 1/3-arc second resolution. At 3-arc
second resolution, the structure does have a prominent
sidewall, but is still, according to a lithological
GIS layer I have currently loaded, within the
boundaries of "mafic volcanic flow," e.g. basalts, and
not material associated with pyroclastic, siliceous
lavas (dacite, andesite) that form the Cascade
stratovolcanoes. Mt. Mazama, the name given to the
former stratovolcano that currently we call crater
lake, was radically altered by its last major
eruption, 7,627 BP
(http://geology.geoscienceworld.org/cgi/content/abstract/27/7/621).
Its tephra layer is an important chronological
constraint in geochronology and in archaeology, and is
present in various thicknesses (following monotonic
decrement, but distributed much more extensively NNE)
from Northern California to Saskatchewan to Montana.
... off to work.
Thaddeus --- Jerry <grf2 at verizon.net> wrote:

> Cool news ie. impact causing HOT SPOT. Sooooo Cool.
> If we generalize [which
> I presume we must not without scientific data to
> support the supposition]
> Yellowstone, Sunset Crater, etc. are all impact
> sites caused when the crust
> was so deeply wounded the mantle material persists
> in melting whatever
> crustal material attempts to scab the wound!
> SUPER COOL!!
> Jerry Flaherty
> ----- Original Message -----
> From: <pkmorgan at ctcweb.net>
> To: "Stefan Brandes" <brandes at gmx.at>
> Cc: <meteorite-list at meteoritecentral.com>
> Sent: Friday, October 12, 2007 5:01 PM
> Subject: Re: [meteorite-list] Mysterious Circular
> Structure Near Chemult,
> Oregon
>
>
> > Looks like something fun to check out either way.
> I've been meaning to
> > get over and explore that general area. Of course
> it would have to be
> > pretty obvious for me to notice anything :-)
> >
> > By the way, I have heard a theory that there was a
> large strike at some
> > point in central Oregon causing a "hot spot" in
> the mantle (?) which has
> > since migrated through the Snake River plain in
> southern Idaho and now
> > lies beneath Yellowstone National Park resulting
> in all of the geothermal
> > activity in that area.
> >
> > Thanks for sharing!
> >
> > Phil
> >
> >
> >> Interesting formation :
> >>
> >>
>
http://epod.usra.edu/archive/epodviewer.php3?oid=382976
> >>
> >> any ideas?
> >>
> >> Stefan
> >> ______________________________________________
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Received on Sat 13 Oct 2007 12:02:24 AM PDT