Hi Pete, Aubrites and enstatite chondrites also plot on the oxygen isotope terrestrial fractionation line (TFL) and up to now they are not proven to be from planets. So being on the TFL doesn't make the meteorite planetary. But I guess it depends on your definition of "planetaries", I would only put lunars and martians in that category, but not HEDs. Last time I checked, 4 Vesta the hypothesized HED parent body, was still an asteroid, not a planet. I see no reason to consider NWA 5400 "planetary". On the other hand, if someone did an age-date on it, and it came up with a crystallization age much more recent than ~4.5 B.Y., then things would get interesting. This is because asteroidal achondrites have ages ~4.5 B.Y., whereas planets tend to have younger basalts. Likewise, the search for meteorites from Mercury or Venus should include igneous crystallization ages as part of the "proof".
Carl Agee Carl B. Agee Director and Curator, Institute of Meteoritics Professor, Earth and Planetary Sciences MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 Tel: (505) 750-7172 Fax: (505) 277-3577 Email: a...@unm.edu http://meteorite.unm.edu/people/carl_agee/ On Mon, Mar 11, 2013 at 2:20 AM, <pshu...@messengersfromthecosmos.com> wrote: > Since this tracks on the terestial O2 line, can this be concidered a > planetary meteorite, along > with the Lunars, Martians, as well as Asteroid 4 vesta? > > Would these be the only 4 planitaries so far or has maybe Mecrury > checked in with a sample of it's own? > > Pete IMCA 1733 > ______________________________________________ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > > -- -- Carl B. Agee Director and Curator, Institute of Meteoritics Professor, Earth and Planetary Sciences MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 Tel: (505) 750-7172 Fax: (505) 277-3577 Email: a...@unm.edu http://meteorite.unm.edu/people/carl_agee/ ______________________________________________ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
