Mapping of carbon concentrations in the Allende meteorite with the 12C(d,p)13C method

Details Mapping of carbon concentrations in the Allende meteorite with the 12C(d,p)13C method Mapping of carbon concentrations in the Allende meteorite with the 12C(d,p)13C method

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91d.373v&link_type=abstract

Journal of Geophysical Research, Volume 91, Issue B4, p. D373-D377

Physics

Scientific paper

We have ``mapped'' carbon concentrations in a 4.2×4.2 mm area of the Allende meteorite with the 12C(d,p)13C nuclear method. The x,y resolution perpendicular to the deuteron beam was 65 μm the depth resolution was 0.6 μm. The matrix of the meteorite contains about 1 wt% carbon, which is uniformly distributed at the 65-μm level of resolution. The matrix contains most, perhaps close to all, C of this meteorite. The coarse-grained constituents, such as chondrules, show a very strong enhancement of C in the depth range 2 to about 0 μm the matrix does not show this enhancement. The enhancement may be due to contamination of the coarse-grained areas or else to migration of C in solid solution from the interiors of comparatively large crystals to their freshly polished surfaces.

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