Other
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997m%26ps...32..863g&link_type=abstract
Meteoritics & Planetary Science, vol. 32, no. 6, pages 863-868
Other
5
Scientific paper
The carbon contents and isotopic compositions of four eucrites, four diogenites and two howardites have been determined. Stepped heating in an oxygen atmosphere was employed to convert selectively different carbonaceous materials to carbon dioxide gas at various temperatures. This technique successfully distinguishes between terrestrial contaminants and indigenous carbon. With the exception of the Kapoeta howardite, the HEDs contain ~ 10-30 ppm indigenous carbon with d13C between u29e and u19e. Kapoeta (a regolith breccia) has an elevated carbon content and d13C, due to the presence of 13C-enriched carbonate minerals (d13C ~ +20e) in CM2- or CR2-like clasts. The range in d13C displayed by HED samples is similar to that of other solar system basalts, such as lunar rocks and martian meteorites, but distinctly different from that of the terrestrial mantle. The diogenites have a slightly lower total carbon yield and higher (13C than the eucrites, a result of degassing of trapped CO/CO2/CO32- from the silicate lattice during metamorphism or annealing. However, three out of the four diogenites studied appear to contain a discrete component, possibly of graphitic carbon coating silicate grains, seemingly unaffected by the extended annealing period experienced by the diogenites. It is possible that this component might host the indigenous primitive xenon recently identified in diogenites.
Grady Monica M.
Pillinger Colin T.
Wright Ian P.
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