[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> This is a multi-part message in MIME format. ------=_NextPart_000_008E_01C328F1.E2D5D600 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 -------------------------------------------------------------------------= ----- Yahoo! Plus - For a better Internet experience ------=_NextPart_000_008E_01C328F1.E2D5D600 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content=3D"text/html; charset=3Diso-8859-1" = http-equiv=3DContent-Type> <META content=3D"MSHTML 5.00.2919.6307" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>Hello Howard and List,</FONT></DIV> <DIV> </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> </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. This gets rid = of most=20 of the effects caused by weathering. The equipment is then = calibrated each=20 time using terrestrial garnets. A laser is then used to vaporize = the=20 sample so that the isotopes can separated and measured in a series = of long=20 tubes. 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> </DIV> <DIV><FONT face=3DArial size=3D2>If weathering had 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. The effect would be a blend of both = extraterrestrial=20 and terrestrial isotopes plotting somewhere other than the Earth/Moon=20 line. The terrestrial contamination then could be calculated out = to find=20 the samples parent body. </FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>As far as the AL26 tests go, there = should have been=20 something measurable if this object spent any length of time at all = in=20 space.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>I am sure scientists have spent enough = time on this=20 pseudo meteorite. 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> </DIV> <DIV><FONT face=3DArial size=3D2>All the best,</FONT></DIV> <DIV> </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> </DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial=20 size=3D2> </FONT> </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 century as claimed, what effects = would=20 that have on isotope tests.</DIV> <DIV> </DIV> <DIV>Howard Wu<BR><BR><B><I>Jeff Grossman <<A=20 href=3D"mailto:jgrossman_at_usgs.gov">jgrossman@usgs.gov</A>></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> <P> <P><BR> <HR SIZE=3D1> <A=20 = href=3D"http://uk.rd.yahoo.com/evt=3D8613/*http://uk.yahoo.com/mail/tagli= ne_plus/?http://uk.promotions.yahoo.com/yplus/yoffer.html"><B><FONT=20 face=3DArial size=3D2>Yahoo! Plus - For a better Internet=20 experience</FONT></B></A><BR></BLOCKQUOTE></BODY></HTML> ------=_NextPart_000_008E_01C328F1.E2D5D600-- Received on Mon 02 Jun 2003 01:29:45 PM PDT |
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