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A First Look at Graphite Grains from Orgueil: Morphology, Carbon, Nitrogen and Neon Isotopic Compositions of Individual, Chemically Separated GrainsPresolar graphite in Murchison has been extensively studied. It is characterized by a unique Ne isotopic composition, known as the Ne-E(L) component. According to studies by Huss and Lewis, the concentration of Ne-E(L) in Orgueil is about one order of magnitude higher than in Murchison, when normalized to the matrix. This could be due to a higher presolar graphite abundance in Orgueil, or due to a higher Ne-E concentrations per grain. The Ne isotopic compositions in individual presolar graphite grains from Murchison have been measured before. It was shown, that a third of the grains have detectable excesses in 22Ne, characteristic of the Ne-E(L) component. One grain in a hundred had a Ne-22 concentration two orders of magnitude higher than blank.
Document ID
20040065863
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Pravdivtseva, O.
(Washington Univ. Saint Louis, MO, United States)
Zinner, E.
(Washington Univ. Saint Louis, MO, United States)
Meshik, A. P.
(Washington Univ. Saint Louis, MO, United States)
Hohenberg, C. M.
(Washington Univ. Saint Louis, MO, United States)
Walker, R. W.
(Washington Univ. Saint Louis, MO, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Publication Information
Publication: Lunar and Planetary Science XXXV: Big Dust, Little Dust, and Aerogel
Subject Category
Lunar And Planetary Science And Exploration
Funding Number(s)
CONTRACT_GRANT: NAG5-12776
CONTRACT_GRANT: NAG5-10426
Distribution Limits
Public
Copyright
Public Use Permitted.
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