[meteorite-list] Shirokovsky authenticity questions? (and Stable Isotopes)

From: mafer <mafer_at_meteoritecentral.com>
Date: Thu Apr 22 10:13:11 2004
Message-ID: <008e01c30d17$1a5b3620$6501a8c0_at_vs.shawcable.net>

I should think a petrological anyalysis would be able to determine that and
avoid the expense of a radio-isotope analysis. Especially since the
"olivine" xtals are so prominant.

Mark
----- Original Message -----
From: Paul Heinrich <lenticulina1_at_yahoo.com>
To: <meteorite-list_at_meteoritecentral.com>
Sent: Sunday, April 27, 2003 4:35 PM
Subject: [meteorite-list] Shirokovsky authenticity questions? (and Stable
Isotopes)


> On Sun, 27 Apr 2003 13:41:53 -0500
> Rosemary Hackney wrote:
>
> >I bought a small piece of Shirokiovsky ( .2 g )
> >was not so expensive.. ( 11.00 I think ) anyway.
> >it has metal and olivine crystals and looked to
> >me like Brahin. Just wondered. If it indeed
> >is Shirokovsky, It looks like a pallasite to my
> >ignorant eyes.
>
> and on 27 Apr 2003 19:01:38 UT and
> in "Shirokovsky", bernd.pauli_at_paulinet wrote:
>
> >When I got my slice some time ago, I didn't know
> >anything about it possibly being a "doubtful
> >case", but this was exactly my very first
> >thought: This looks suspiciously like Brahin -
> >though on a smaller, more delicate scale. I
> >still like my wafer-thin slice even if it is
> >not what it is supposed to be.
>
> I have to wonder if stable isotope ratios could
> not only be used to differentiate meteorites from
> various terrestrial materials, but also determine
> if pieces came from the same meteorite. One would
> expect stable isotope values, e.g, oxygen isotopes
> from meteorites to cluster within a range.
> However, do oxygen isotope values from different
> meteorites vary enough within that range where
> different meteorites would have slightly but
> distinctly different values and samples from
> the same meteorite have exactly the same value?
> If this is the case, a person can take samples
> from an alleged Shirokiovsky and a Brahin
> and see if the values differ enough for them
> to be from different meteorites or whether they
> are exactly the same and likely from the same
> meteorite.
>
> Using other stable isotopes, e.g., hydrogen, the
> cross-plotting of data might one be able to
> determine whether individual fragments came from
> the same meteorite?
>
> Just Some Thoughts
>
> Paul
> Baton Rouge, LA
>
>
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Received on Sun 27 Apr 2003 07:45:06 PM PDT