[meteorite-list] PORTALES

From: Southwest Meteorite Lab E-mail <meteoritelab_at_meteoritecentral.com>
Date: Thu Apr 22 10:01:31 2004
Message-ID: <001501c20dd4$2e3a5d80$9b0c2aa2_at_kitty>

From: Southwest Meteorite Lab
Sent: Thursday, June 06, 2002 6:45 PM
To: 'meteorite-list-admin_at_meteoritecentral.com'
Subject: RE: [meteorite-list] portales

Dear Dave and list
I like your Portales story, it is my favorite also. If any of you are
interested I have decided to quickly put together a portales page that has a
few photos and a brief retelling of the Meteorite Stuck in the Road Story.
And to answer your question permission was given before the cutting began.
In fact the county road department gave us material to patch the hole in the
road.
Here is the address http://www.meteorite-lab.com/portales.htm
Marvin and Kitty Killgore
Southwest Meteorite Lab
PO Box 95
Payson, AZ 85547
PH.928.474.9515
FAX.928.474.2474
email_at_meteorite-lab.com
meteoritelab_at_cybertrails.com

-----Original Message-----
From: meteorite-list-admin_at_meteoritecentral.com
[mailto:meteorite-list-admin_at_meteoritecentral.com] On Behalf Of David
Freeman
Sent: Wednesday, June 05, 2002 1:41 PM
To: rbourlan_at_evansville.net
Cc: harlan trammell; meteorite-list_at_meteoritecentral.com
Subject: Re: [meteorite-list] portales

Dear Rhett, Harlan, and List;
My portales story is...the neatest piece that I saw was half buried in a
living chunk of asphalt! And I always wondered if it was sawn out first
and permission granted second or was it guarded until saws and a plan
were gathered. This was a most amazing effort at specimen collecting
in the least.

My second portales story, my work associate has a brother that lives
there and they are all now meteorite hunters.
Long Live portales and we need a few more events just like that one!
Best,
Dave F.


Rhett Bourland wrote:
>Hi Harlan,
>First of all, good topic!!! I hope a lot of people post on this one as I'd
>love to hear what everyone has to say on it. I apologize if I get a bit
>wordy but I know a lot of people who may not know very much about
meteorites
>come here to learn so I thought I'd talk a bit. If I'm too far off base on
>any of this I apologize and please let do not hesitate to correct me.
>Before I even start about how I believe it formed, I'll start off with what
>I know about it. It is an H6 chondrite which means that it formed deeper
in
>the asteroid it came from than other H chondrites like H3's, H4's, and
H5's.
>For a good explanation on the formation of asteroids check out "Meteorites
>and Their Parent Planets" by McSween. Almost all asteroids start off as
>"onion shells" with the more metamorphosed grades buried deeper in the
>parent body than the lower grades. This is due to the asteroid's ability
to
>more easily radiate the heat from its outer layers than the more inside
>parts and thus heat is what equilibrated and altered the areas closer to
the
>core more than the regions near the surface. Some asteroids, after being
>formed as an onion shell, will undergo collisions which, depending on their
>severity, will have different effects on different parent bodies. If the
>impact is severe enough then the asteroid will be shattered and pieces of
it
>will go flying off in many directions and not reaccreate. If the impact
>isn't as strong, however, the pieces of it will come back together under
>gravities powers and the various grades (3's, 4's...) will be mixed
>together. The high number of H breccias (like Zag which is an H3-6 or
>Noblesville which is an H4-6) would seem to indicate that the H parent body
>is a rubble pile asteroid. Subsequent heating in the core of the asteroid
>doesn't happen because the nuclear isotopes that caused that heating have
>most likely already ran their course by this time. This would seem to be
>backed up by the reflectance spectra of asteroid 6 Hebe which, depending on
>what area is being imaged, has areas that match the respective grades of
>H's.
>I also know there are large sections of iron in this chondrite that are
>unlike any other meteorite out there. These large sections of irons will
>display a Widmanstatten like most iron meteorites when etched. To be able
>to form the necessary bands in the pattern would require that this
meteorite
>was formed deep within the asteroid so that there would be plenty of
>insulation (in the form of rock) to keep the heat in the inside of the
>asteroid so that the kamacite and taenite would have the needed time to
grow
>large enough to show up when etched. Something that's interesting about
the
>nickel-iron in Portales is that the metal in the veins of this meteorite is
>different from the metal flecks seen in all chondrites (especially the
H's).
>Another unusual thing is that there is less free iron in the silicate areas
>of Portales than in normal H chondrites (about 4% in comparison to the
>normal 15%-19%) even though fayalite values remain pretty much the same as
>other H's (19.3% +/-0.4%). Check out the Met. Bul. containing information
>on this meteorite at
>http://www.uark.edu/campus-resources/metsoc/metbull/mb83.htm
>SOOOOOOOO, to get to the point of this email, how do I think Portales was
>formed? Early in the H parent body's history a pretty good sized impact
>happens on the H parent body. Its powerful enough to disrupt the asteroid
>to its center but not necessarily powerful enough to break up the asteroid.
>When it does this, some of the free metal in this region pools together to
>form the large metal veins. Keep in mind, this is early enough in its
>history that the nuclear isotopes that are heating this asteroid are still
>active. Also, since Portales Valley is an H6 that would mean that is
>towards the core of the asteroid and has plenty insulation in the rocks
>above it to keep it warm enough to sustain the kamacite and taenite growth
>needed to form the Widmanstatten patterns that are seen in the large metal
>areas of Portales Valley.
>My 8 cents,
>Rhett Bourland
>www.asteroidmodels.com
>www.asteroidmodels.com/personal
>www.meteoritecollectors.org
>-----Original Message-----
>From: meteorite-list-admin_at_meteoritecentral.com
>[mailto:meteorite-list-admin_at_meteoritecentral.com]On Behalf Of harlan
>trammell
>Sent: Wednesday, June 05, 2002 11:40 AM
>To: meteorite-list_at_meteoritecentral.com
>Subject: [meteorite-list] portales
>
>
>how do YOU think portales got formed?
>
>
>
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Received on Thu 06 Jun 2002 11:33:53 PM PDT