[meteorite-list] Self Proclaimed Pairings Issues (SPPI)
From: David Weir <dgweir_at_meteoritecentral.com>
Date: Fri May 5 17:03:31 2006 Message-ID: <445BBC52.7020405_at_earthlink.net> Hello Rob, I don't believe that a new find can ever be considered absolutely and without a doubt to be paired with another meteorite or group of meteorites that have already been analyzed and classified under a specific name. The best that can be said is that it is "likely" paired. You would have to submit the new material and go through the classification process again, which takes lots of money and may take years, even 5 years as Greg Hupe's anomalous chondrite did. This outlay of resources is the reason for the defensive post by Adam, which I understand. But he is also the one who benefited with the ~$1000/g sales, now reduced to only $15/g. What's not fair? See the following info on pairing: Meteorite Pairing (P. Benoit et al., 2000) PAIRING CRITERIA: Parent body history Bulk elemental and isotopic concentrations Mineral abundance and compositions Petrography (shock, metamorphic, and igneous textures) Stable isotope abundance and formation ages Meteoroid space history Cosmogenic noble gas ratios (cosmic-ray exposure age, shielding, solar gases, thermal history) Natural TL (reheating) Meteorite terrestrial history Geographic proximity Shape and size Number of specimens Terrestrial age Weathering grade Natural TL levels Applying data from these criteria to the formula below, a pairing score and its associated pairing likelihood is obtained. Prel = Prel* ? Pss ? Pbrec ? Pcre ? Psolar ? P3He ? Ptage ? Pweath ? PNatTL where... Prel* = relative abundance by classification Pss = relative abundance by shock stage Pbrec = relative abundance by brecciation Pcre = relative abundance by cosmic-ray exposure age Psolar = relative abundance by solar-gas-bearing meteorites P3He = relative abundance by light noble gas depleted meteorites Ptage = relative abundance by terrestrial age Pweath = relative abundance by weathering factor PNatTL = relative abundance by natural TL levels Pairing score (%) / Pairing likelihood >90_______Likely 80-90_____Probable 70-80_____Possible 50-70_____Potential <50_______Candidate or Unlikely David Received on Fri 05 May 2006 04:57:54 PM PDT |
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