Other
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995natur.373..496g&link_type=abstract
Nature, Volume 373, Issue 6514, pp. 496-499 (1995).
Other
5
Scientific paper
PRIMITIVE meteorites (carbonaceous chondrites and unequilibrated ordinary chondrites) are isotopically heterogeneous, indicating that the material from which the Solar System formed was not com-pletely homogenized1-4. On the other hand, isotopically hetero-geneous material is not expected to survive in thermally 'processed' planetary or asteroidal objects. The achondrite meteorite Acapulco is a remnant of one such object; its petrographic and trace-element characteristics suggest that the parent body experienced pervasive heating and partial melting5. Here we report the discovery of graphite grains in the Acapulco meteorite that have a wide range of carbon and nitrogen isotopic compositions (δ 13C ranging from -34 to -8%o and δ 15N from -154 to -67%o). The graphite is associated with metal, and in some cases, graphite grains associ-ated with the same metal grain have very different isotopic compos-itions. These findings suggest that the graphite grains retain the isotopic signatures of a diverse range of precursor materials, despite the high temperatures reached in the parent asteroid.
Gorosy Ahmed Ei
Marti Kurt
Zinner Ernst
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