Uranium distribution and 'excessive' U-He ages in iron meteoritic troilite

Details Uranium distribution and 'excessive' U-He ages in iron meteoritic troilite Uranium distribution and 'excessive' U-He ages in iron meteoritic troilite

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985metic..20...37f&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 20, March 31, 1985, p. 37-41. NASA-supported research.

Computer Science

Abundance, Iron Meteorites, Meteoritic Composition, Nuclear Fission, Troilite, Uranium, Graphite, Helium, Particle Tracks, Meteorites, Samples, Meteorite, Uranium, Distribution, Abundance, Ages, Isotopic Ratios, Dating Methods, Iron Meteorites, Troilite, Procedure, Fission Tracks, Analysis, Graphite, Heterogeniety, Grains, Pattern

Scientific paper

Fission tracking techniques were used to measure the uranium distribution in meteoritic troilite and graphite. The obtained fission tracking data showed a heterogeneous distribution of tracks with a significant portion of track density present in the form of uranium clusters at least 10 microns in size. The matrix containing the clusters was also heterogeneous in composition with U concentrations of about 0.2-4.7 ppb. U/He ages could not be estimated on the basis of the heterogeneous U distributions, so previously reported estimates of U/He ages in the presolar range are probably invalid.

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