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        182Hf-182W chronometry and the early evolution history in the acapulcoite-lodranite parent body

        Lee, D.-C. (The Meteoritical Society, 2008-01-01)
        An acapulcoite, Northwest Africa (NWA) 725, a transitional acapulcoite, Graves Nunataks (GRA) 95209, and a lodranite, NWA 2235, have been studied with the short-lived chronometer 182Hf-182W system in order to better constrain the early evolution history in the acapulcoite-lodranite parent body. Unlike the more evolved achondrites originating from differentiated asteroids--e.g., eucrites and angritesbulk rock acapulcoites and lodranite are characterized by distinct 182W deficits relative to the terrestrial W, as well as to the undifferentiated chondrites, epsilon-w varies from -2.7 to -2.4. This suggests that live-182Hf was present during the formation of acapulcoites and lodranites, and their parent body probably had never experienced a global melting event. Due to the large uncertainties associated with the isochron for each sample, the bulk isochron that regressed through the mineral separates from all 3 samples has provided the best estimate to date for the timing of metamorphism in the acapulcoite-lodranite parent body, 5 (+6/-5) Myr after the onset of the solar system. It is thus inconclusive whether acapulcoites and lodranites have shared the same petrogenetic origin, based on the Hf-W data of this study. Nevertheless, the formation of acapulcoite-lodranite clan appears to have post-dated the metal-silicate segregation in differentiated asteroids. This can be explained by a slower accretion rate for the acapulcoite-lodranite parent body, or that it had never accreted to a critical mass that could allow the metal-silicate segregation to occur naturally.
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        2001 Appreciations

        The Meteoritical Society, 2002-01-01
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        2001 Leonard Medal Citation for Harry Y. McSween, Jr.

        Drake, M. J. (The Meteoritical Society, 2002-01-01)
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        2002 Appreciations

        The Meteoritical Society, 2002-01-01
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        2002 Best Student Paper in Planetary Sciences Award for Nicolas Dauphaus

        Ott, Ulrich (The Meteoritical Society, 2004-01-01)
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        2002 Leonard Medal Citation

        McSween, H. Y. (The Meteoritical Society, 2003-01-01)
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        2002 Nier Prize Citation for Dante Lauretta

        Fegley, Bruce (The Meteoritical Society, 2002-01-01)
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        2003 Best Student Paper in Planetary Sciences Award for Shoichi Itoh

        Ott, Ulrich (The Meteoritical Society, 2005-01-01)
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        2003 Leonard Medal for Herbert Palme

        Wasson, John T. (The Meteoritical Society, 2003-01-01)
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        2003 Nier Prize Citation for Steven J. Desch

        Fegley, Bruce (The Meteoritical Society, 2003-01-01)
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        2004 Leonard Medal Citation for Michael J. Drake

        McSween, H. Y. (The Meteoritical Society, 2005-01-01)
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        2004 Leonard Medal for Michael J. Drake

        McSween, Harry Y. (The Meteoritical Society, 2004-01-01)
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        2004 Nier Prize for Scott R. Messenger

        Nittler, Larry R. (The Meteoritical Society, 2004-01-01)
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        2005 Barringer Medal for Billy P. Glass

        Koeberl, Christian (The Meteoritical Society, 2005-01-01)
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        2005 Leonard Medal for Joseph I. Goldstein

        Rubin, Alan (The Meteoritical Society, 2005-01-01)
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        2005 Nier Prize for Nicolas Dauphas

        Marty, Bernard (The Meteoritical Society, 2005-01-01)
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        2006 Barringer Medal for Robert M. Schmidt

        Melosh, H. J. (The Meteoritical Society, 2006-01-01)
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        2006 Leonard Medal for Michael J. Gaffey

        McCoy, Timothy J. (The Meteoritical Society, 2006-01-01)
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        2006 Nier Prize for Matthieu Gounelle

        Meibom, Anders (The Meteoritical Society, 2006-01-01)
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        2006 Service Award for Jörn Koblitz

        Schlüter, Jochen (The Meteoritical Society, 2006-01-01)
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