[meteorite-list] Fwd: analytical classification

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From: Jeff Grossman <jgrossman_at_meteoritecentral.com>
Date: Thu Apr 22 10:20:59 2004
Message-ID: <5.1.0.14.2.20030706184549.01d700f8_at_gsvaresm02.er.usgs.gov>

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Of course you have to analyze more than one grain to characterize a
sample.  I'm sure that most analysts do at least 5-10 analyses per
sample even on equilibrated chondrites.  If a chondrite turns out to
be type 3, you'd probably want at least a few dozen. 
At 05:23 PM 7/6/2003 -0400, GT40dawg_at_aol.com wrote: 
<blockquote type=cite class=cite cite>To all: 
Dean- 
       Thanks for all of your patience in
my recent e-mails concerning the abovementioed subject. 
       Below is the reply I received from
Jeff, with my initial e-mail to him attached.  Analyzing the
olivines in a meteorite sample will not be an issue.  So, if
olivines are the main mineral phase of concern for H/L/LL classification,
I can be of help to you also. 
       LIke I said earlier, 2 analyses
would be $100 
                       
4 analyses would be $150 
                       
6 analyses would be $200 
       These analyses can be multiple
analyses on one sample, or single analyses on several samples (i.e. 6
olivine and/or pyroxene analyses on one NWA or one olivine analyses on 6
seperate NWAs, or any combination thereof). 
       Hopefully, this has cleared the
issue up for everybody involved.  In summary, I can classify a
sample as an H, L, or LL using the method discussed in Jeff's e-mail, I
can get results to you faster than the institutions, and all sample
material will be returned to you if so desired.  Metamorphic grade,
howver, will only be an estimate. 
       Any further thoughts? 
Hopefully, all of this info will persuade some of you to send some work
my way.  Please let me know what you think. 
 
Sincerely, 
Randy in N.O. 
Return-Path: <jgrossman_at_usgs.gov> 
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Date: Sun, 06 Jul 2003 15:13:35 -0400 
To: GT40dawg_at_aol.com 
From: Jeff Grossman <jgrossman_at_usgs.gov> 
Subject: Re: analytical classifiucation 
In-Reply-To: <42.3a59e0a5.2c39cbb4_at_aol.com> 
Mime-Version: 1.0 
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For a proper classification of ordinary chondrites, one would normally
make a quantitative analysis of the Fe/(Fe+Mg) ratio in olivine. This
allows separation of H, L, and LL groups.  We also do expect at
least a rough estimation of metamorphic grade. One could also use
pyroxene compositions, but the most comprehensive studies of ordinary
chondrites focus on olivine, and so this is what everybody uses for
classification.  It's also a very simple mineral to
analyze. 
jeff 
At 03:00 PM 7/6/2003 -0400, you wrote: 
<blockquote type=cite class=cite cite>Dr.
Grossman- 
I am sure that you have recieved some e-mails concerning my
classification of meteorites via electron microprobe.  My approach
is to differentiate between H and L chondrites, based on the presence of
either bronzite or hypersthene pyroxene.  Does this sound
acceptable?  Most schemes I've seen use this nomenclature.  Of
course, this does not cover the problem of metamorphic grade, but I want
to classify between Hs or Ls based on this information. 
It sounds like there is a lot of potential to do so, and it would help me
immensely if I could get this approved for the ordinary chondrites. 
As far as my background, I have a BS and MS in Geology (geochemistry and
petrology) and a vast amount of experience with the equipment. 
Any thoughts? 
 
Randy in N.O. </blockquote> 
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 
</blockquote>
<x-sigsep></x-sigsep>
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 
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Received on Sun 06 Jul 2003 06:53:22 PM PDT

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