Carbon isotopic variation within individual diamonds

Details Carbon isotopic variation within individual diamonds Carbon isotopic variation within individual diamonds

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.303..793s&link_type=abstract

Nature (ISSN 0028-0836), vol. 303, June 30, 1983, p. 793-795. Research supported by the Science and Engineering Research Council

Other

21

Abundance, Carbon Isotopes, Diamonds, Geochemistry, Carbon Dioxide, Carbon 12, Carbon 13, Chemical Fractionation, Crystal Growth, Impurities, Isotopic Enrichment, Laser Cutting

Scientific paper

The intra-specimen distribution of carbon isotope abundance in type I diamonds was studied by a sealed tube technique. The cores of the diamonds were found to be isotopically light, i.e., enriched in C-12, while the isotopic mass increased outwards. The variations amounted to 4 parts per thousand for carbon liberated above 600 C. Further studies were performed with 47 laser-cut samples to determine the concentrations of other impurities, with the finding of no definite pattern of other distribution anomalies. It is suggested that the skewed delta C-13 distribution arose from injection of carbon from isotopically distinct reservoirs. The data are consistent with a carbon dioxide source with formation occurring according to a Rayleigh distribution process.

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