Re 2: [meteorite-list] PUTORANA not PURTARANO

From: Matt Morgan <mmorgan_at_meteoritecentral.com>
Date: Thu Apr 22 10:29:54 2004
Message-ID: <DJEHIHPEEMGNJLMPFAEIIEDHCPAA.mmorgan_at_mhmeteorites.com>

John:
For starters read the article at the bottom of the page here..
http://www.mhmeteorites.com/pubs/news.htm

This may help you see why and how things got "strange" with this rock.
Matt Morgan

-----Original Message-----
From: meteorite-list-admin_at_meteoritecentral.com
[mailto:meteorite-list-admin_at_meteoritecentral.com]On Behalf Of
j.divelbiss_at_att.net
Sent: Thursday, September 11, 2003 7:41 PM
To: j.divelbiss_at_att.net
Cc: Steve Arnold, Chicago!!!; meteorite-list_at_meteoritecentral.com
Subject: Re 2: [meteorite-list] PUTORANA not PURTARANO


List members,

I'll respond to my own thread by going one step further...recognizing that
eucrites and terrestrial basalts are chemically about the same. However,
looking at the few eucrites I have, they are much finer grained and less
colorful than the Putorana basalt. The plagioclase needles are much larger
and more prevalent in the Putorana sample I have when compared to the
eucrites I have. Putorana looks something like the terrestrial basalt photo
on page 154 of the Cambridge Encylcopedia of Meteorites by Norton. The
Putorana is even more colorful and is loaded with twinnig plag needles and
moderately sized pheoncrysts of pyroxene and olivine than that basalt
picture
on 154.

Putorana does look like a couple sections I have, but they are terrestrial
gabbros...one being a plain old (but beautiful) diabase and the other is a
modified(cooked) gabbro called metadiabase. The diabase and Putorana look
very much alike in thin section ...minus the metal seen in Putorana.

Even my Zagami section, a Mars basalt, looks nothing like Putorana in thin
section. See 169 for sample of it.

So, can anyone tell us that they have seen a eucrite that looks like
Putorana
in thin section? Maybe I'll get someone to post some of my pictures on their
site to compare. I'll also contact Jeff Rowell for his take on this
issue...he has a number of sections including Putorana and several eucrites.

John



> Steve and others,
>
> A few months ago I posted a thread to the list that basically said that
while
> the Putorana looks like a mesosiderite...that when I compared it to Vaca
> Muerta in thin section, they look nothing alike at all. Plain and simple
the
> Putorana looks like the basalt that it has been identified as.
>
> My question to others is "why did it take so long to figure that out when
it
> seems so obvious to a novice like me...in thin section?".
>
> Are there other mesosiderites that look like basalt in thin section? If
so,
> which ones? If not...were the researchers considering it to be a new type?
>
> Also noteworthy is that Ivan (finmet) is selling Putorana again, and his
> description is alluding to it being considered to be extraterrestrial
again,
> because in his/others words...such a rock cannot exist on earth (native
iron
> separated within a rock). Does anyone know what is going on with the
research
> of this material. Is it really being considered to from out of this world
> again?
>
> Putorana sure looks like basalt to me...and it does not like any eucrite
or
> diogentite that I've seen in thin section...which are the known rock parts
of
> mesosiderites.
>
> Puzzled again,
>
> John
> > Wow what a beautiful piece of earth rock.It is so hard to believe that
> > this is not a meteorite, in stead of meteorwrong.I want to thank matt
> > morgan for letting me purchase a piece of PURTARANO.I just got a 219
gram
> > slice.This thing is gorgeous.It looks so much like a stony iron.It looks
> > alot like morristown.Thanks again to matt for letting me have this great
> > looking slice.
> >
> > steve arnold
> >
> > =====
> > Steve R.Arnold, Chicago, IL, 60120
> > I. M. C. A. MEMBER #6728
> > Illinois Meteorites
> > website url http://stormbringer60120.tripod.com
> > http://members.ebay.com/aboutme/illinoismeteorites/
> >
> >
> >
> >
> >
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Received on Thu 11 Sep 2003 11:05:46 PM PDT


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