The cycle of carbon and the stable carbon isotopes

Details The cycle of carbon and the stable carbon isotopes The cycle of carbon and the stable carbon isotopes

Mar 1956

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1956gecoa...9..136w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 9, Issue 3, pp.136-153

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9

Scientific paper

The following estimates are used: carbonate carbon ( A ) 2420 ± 560 grammes, C 12 / C 13 = 88·55 ± 0·05; organic sedimentary carbon ( B ) between 0·1-0·5 per cent C in shales, C 12 / C 13 = 91·00 ± 0·1 . The concept "crustal carbon" is defined, and based on the measurements of the isotope ratios of thirty-seven diamonds, nineteen carbonates from Ivigtut, some other carbonates and some graphites: the isotope ratio of crustal carbon is estimated to be 89·11 ± 0·05. Using these isotope ratios, the ratio A / B is found to be 3·45 ± 0·55, and B = 700 ± 200 grammes. All weights are referred to cm 2 earth surface, and the isotope ratios to the Stockholm scale.

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