Carbon isotopic composition of graphite grains in the EL Taco IAB iron meteorite

Details Carbon isotopic composition of graphite grains in the EL Taco IAB iron meteorite Carbon isotopic composition of graphite grains in the EL Taco IAB iron meteorite

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1627z&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 627.

Computer Science

2

Iron Meteorites, Graphite, Meteoritic Composition, Carbon Isotopes, Achondrites, Petrography, In Situ Measurement, Silicates

Scientific paper

Carbon isotopes have been analyzed in individual graphite grains of the El Taco iron meteorite. Graphite is present in four distinct petrographic associations and a total of 28 grains has been analyzed from all areas. The C isotopic composition varies from delta-C-13 = +4 to -29 percent and exhibits well-defined correlations with graphite morphology. The El Taco graphites contain much less N, with CN/C ratios of 0.0027 to 0.005, than graphites from Acapulco or unequilibrated ordinary chondrites. Graphite appears to retain an isotopic record of precursor materials despite high peak temperatures and may be an important tracer of early solar system proceses.

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