The isotopic fractionation of carbon in geological processes

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Abstract
Stability of the isotopic composition of carbon in endogenic terrestrial substances, as well as in meteorites, consistently lower in C13 than the biogenic marine carbonates, suggests both presence and stability of a certain zone under the crust of the earth in which the C systems are maintained at certain equilibria, at different levels, typical of certain geological processes operative therein. Isotopic exchanges and recurrent fractionations of the C isotopes, in the course of the migrations of carbon, are indicated by the available evidence, the net result of which is an impoverishment of C13 in living substance and in its derivatives (oils, coals, etc.), and its enrichment in the biogenic residual carbonates. – IGR Staff.

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