[meteorite-list] Shirokovsky statement from NomCom

From: Adam Hupe <adamhupe_at_meteoritecentral.com>
Date: Thu Apr 22 10:22:33 2004
Message-ID: <009101c3292c$8f77d180$b4dbe60c_at_attbi.com>

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Hello Howard and List,

Your question was, what kind of effects would sitting at the bottom of a =
reservoir have on the Isotope tests?

The technique used at Carnegie is to first etch off the external =
portions of the test sample with acid. This gets rid of most of the =
effects caused by weathering. The equipment is then calibrated each =
time using terrestrial garnets. A laser is then used to vaporize the =
sample so that the isotopes can separated and measured in a series of =
long tubes. Usually several test samples of the same material are run to =
increase accuracy and to recheck results.

If weathering had any kind of an effect on the tests it still would not =
plot on the terrestrial line unless it was from the Earth or the Moon. =
The effect would be a blend of both extraterrestrial and terrestrial =
isotopes plotting somewhere other than the Earth/Moon line. The =
terrestrial contamination then could be calculated out to find the =
samples parent body.=20

As far as the AL26 tests go, there should have been something measurable =
if this object spent any length of time at all in space.

I am sure scientists have spent enough time on this pseudo meteorite. =
Too bad this time could not have been spent on the real thing as lab =
time is very limited and this kind of testing delays other projects.

All the best,

Adam Hupe
The Hupe Collection
IMCA 2185


      =20
  ----- Original Message -----=20
  From: Howard Wu=20
  To: Jeff Grossman ; meteorite-list_at_meteoritecentral.com=20
  Sent: Monday, June 02, 2003 9:41 AM
  Subject: Re: [meteorite-list] Shirokovsky statement from NomCom


  Here's a weird spin on this. If this rock has been sitting at the =
bottom of a reservoir for half a century as claimed, what effects would =
that have on isotope tests.

  Howard Wu

  Jeff Grossman <jgrossman_at_usgs.gov> wrote:
    Hi all,

    The Nomenclature Committee has issued the following statement on the =

    "Shirokovsky pallasite."

    http://meteoriticalsociety.org/bulletin/shirokovsky.pdf

    Much of this is based on what many of you have already seen on the =
Russian=20
    web site.

    Bottom line: There is at present no evidence other than the recovery =
story=20
    to suggest that this is a meteorite. Mineralogy, chemistry, oxygen=20
    isotopes, and noble gases all favor a terrestrial origin.

    jeff

    Dr. Jeffrey N. Grossman
    Chair, Meteorite Nomenclature Committee (Meteoritical Society)
    US Geological Survey
    954 National Center
    Reston, VA 20192, USA
    Phone: (703) 648-6184 fax: (703) 648-6383



    ______________________________________________
    Meteorite-list mailing list
    Meteorite-list_at_meteoritecentral.com
    http://www.pairlist.net/mailman/listinfo/meteorite-list





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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Hello Howard and List,</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Your question was, what kind of effects =
would=20
sitting at the bottom of a reservoir have on the Isotope =
tests?</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>The technique used at Carnegie is to =
first etch off=20
the external portions of the test sample with acid.&nbsp; This gets rid =
of most=20
of the effects caused by weathering.&nbsp; The equipment is then =
calibrated each=20
time using terrestrial garnets.&nbsp; A laser is then used to vaporize =
the=20
sample so that the isotopes can separated and measured&nbsp;in a series =
of long=20
tubes.&nbsp;Usually several test samples of the same material are run to =

increase accuracy and to recheck results.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>If weathering had&nbsp;any kind of an =
effect on the=20
tests it still would not plot on the terrestrial line unless it was from =
the=20
Earth or the Moon.&nbsp; The effect would be a blend of both =
extraterrestrial=20
and terrestrial isotopes plotting somewhere other than the Earth/Moon=20
line.&nbsp; The terrestrial contamination then could be calculated out =
to find=20
the samples parent body.&nbsp;</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>As far as the AL26 tests go, there =
should have been=20
something measurable&nbsp;if this object spent any length of time at all =
in=20
space.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I am sure scientists have spent enough =
time on this=20
pseudo meteorite.&nbsp; Too bad this time could not have been spent on =
the real=20
thing as lab time is very limited and this kind of testing delays other=20
projects.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>All the best,</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Adam Hupe</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>The Hupe Collection</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>IMCA 2185</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>&nbsp;</DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A href=3D"mailto:freewu2000_at_yahoo.com" =
title=3Dfreewu2000_at_yahoo.com>Howard Wu</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
href=3D"mailto:jgrossman_at_usgs.gov"=20
  title=3Djgrossman_at_usgs.gov>Jeff Grossman</A> ; <A=20
  href=3D"mailto:meteorite-list_at_meteoritecentral.com"=20
  =
title=3Dmeteorite-list_at_meteoritecentral.com>meteorite-list@meteoritecentr=
al.com</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, June 02, 2003 =
9:41 AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [meteorite-list] =
Shirokovsky=20
  statement from NomCom</DIV>
  <DIV><BR></DIV>
  <DIV>Here's a weird spin on this. If this rock has been sitting at the =
bottom=20
  of a reservoir for half a&nbsp;century as claimed,&nbsp;what effects =
would=20
  that have on isotope tests.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Howard Wu<BR><BR><B><I>Jeff Grossman &lt;<A=20
  href=3D"mailto:jgrossman_at_usgs.gov">jgrossman@usgs.gov</A>&gt;</I></B>=20
  wrote:</DIV>
  <BLOCKQUOTE=20
  style=3D"BORDER-LEFT: #1010ff 2px solid; MARGIN-LEFT: 5px; =
PADDING-LEFT: 5px">Hi=20
    all,<BR><BR>The Nomenclature Committee has issued the following =
statement on=20
    the <BR>"Shirokovsky pallasite."<BR><BR><A=20
    =
href=3D"http://meteoriticalsociety.org/bulletin/shirokovsky.pdf">http://m=
eteoriticalsociety.org/bulletin/shirokovsky.pdf</A><BR><BR>Much=20
    of this is based on what many of you have already seen on the =
Russian=20
    <BR>web site.<BR><BR>Bottom line: There is at present no evidence =
other than=20
    the recovery story <BR>to suggest that this is a meteorite. =
Mineralogy,=20
    chemistry, oxygen <BR>isotopes, and noble gases all favor a =
terrestrial=20
    origin.<BR><BR>jeff<BR><BR>Dr. Jeffrey N. Grossman<BR>Chair, =
Meteorite=20
    Nomenclature Committee (Meteoritical Society)<BR>US Geological =
Survey<BR>954=20
    National Center<BR>Reston, VA 20192, USA<BR>Phone: (703) 648-6184 =
fax: (703)=20
    =
648-6383<BR><BR><BR><BR>______________________________________________<BR=
>Meteorite-list=20
    mailing=20
    =
list<BR>Meteorite-list_at_meteoritecentral.com<BR>http://www.pairlist.net/ma=
ilman/listinfo/meteorite-list</BLOCKQUOTE>
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Received on Mon 02 Jun 2003 01:29:45 PM PDT


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