Re 2: [meteorite-list] PUTORANA not PURTARANO

From: j.divelbiss_at_att.net <j.divelbiss_at_meteoritecentral.com>
Date: Thu Apr 22 10:29:54 2004
Message-ID: <20030912014040.6247353565_at_pairlist.net>

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 09:40:32 PM PDT