[meteorite-list] Mysterious Circular Structure: captions at http://s237.photobucket.com/albums/ff316/endophasy/

From: Thaddeus Besedin <endophasy_at_meteoritecentral.com>
Date: Sat, 13 Oct 2007 02:57:38 -0700 (PDT)
Message-ID: <315663.890.qm_at_web62515.mail.re1.yahoo.com>

You may probably want to know what you are looking at.

-Thaddeus
all images and captions are at
http://s237.photobucket.com/albums/ff316/endophasy/
--- Thaddeus Besedin <endophasy at yahoo.com> wrote:

> List,
> This structure is a spreading zone, in an
> extensional
> basin, and most of its morphology is due to the
> chemult graben fault system, a normal (in geologic
> terms, as opposed to a reverse fault system) fault
> system which makes the structure a horst/volcanic
> arc
> (see calderas in images).
> The Western portion seems to be known as Walker Rim,
> but I could be wrong.
> Spreading of crust allowed basaltic flows to emerge,
> not an impact (the entire Great Basin is
> structurally
> a parallel series of normal faults and Horst/Graben
> blocks). The
> ring of extinct basaltic cones,emerged from a
> single,
> very ancient primary caldera, intruded later during
> a
> second period of volcanic activity, probably
> synchronically corresponding to flood basalt
> extrusion
> on the Columbia Plateau. Palinspastic reconstruction
> may show a rotational tendency for this axial
> structure as a tensional center, erupting as the
> valley floor spread.
> I worked for a few hours in Global Mapper 8.3 on
> these, with most of the time spent waiting for
> photobucket uploads (painfully slow). These are
> digital elevation model images, Landsat 7 images,
> fault and lithologic overlays, topographic profiles,
> and 3D image compilations of the above. Enjoy.
>
http://i237.photobucket.com/albums/ff316/endophasy/ORstruct30m1wlitho.jpg
>
http://i237.photobucket.com/albums/ff316/endophasy/ORstructlandsat7wlitho.jpg
>
http://i237.photobucket.com/albums/ff316/endophasy/vert65withLandsat7andlitho.jpg
>
http://i237.photobucket.com/albums/ff316/endophasy/profileW-E.jpg
>
http://i237.photobucket.com/albums/ff316/endophasy/W-EprofileonLANDSAT7.jpg
>
http://i237.photobucket.com/albums/ff316/endophasy/N-SprofileonLANDSAT-1.jpg
>
http://i237.photobucket.com/albums/ff316/endophasy/N-SprofileonLANDSAT.jpg
>
http://i237.photobucket.com/albums/ff316/endophasy/faultslabelslithoTN.jpg
>
http://i237.photobucket.com/albums/ff316/endophasy/vert65viewS3Dlithofaultslabels.jpg
>
http://i237.photobucket.com/albums/ff316/endophasy/faults30mDEMnolabels.jpg
> -Thaddeus Besedin
> --- Thaddeus Besedin <endophasy at yahoo.com> wrote:
>
> >
> > 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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> > > >
> > > >
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Received on Sat 13 Oct 2007 05:57:38 AM PDT