Über den Isotopengehalt des Kohlenstoffs in Süsswasser-Kalkablagerungen

Mathematics – Logic

Scientific paper

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Scientific paper

An attempt is made to interpret the observed C 13 / C 12 ratio in fresh-water carbonates in terms of the origin of the carbon and the isotope exchange constants involved. Measurements of the isotope ratio of the inorganically dissolved carbon in hard ground waters are reported. It appears that the average depletion in C 13 content of about 14%0 compared with Solnhofen limestone can be explained quite satisfactorily on this basis. It is shown that the expected isotope ratio of calcium carbonate precipitated from such water is compatible with that of sinter. A few measurements of sinter samples are given and the results on a number of loess samples are discussed. Although considerable caution is necessary when applying isotopic data to geological problems it is felt that with a better understanding of the mechanisms valuable conclusions can be drawn from the C 18 / C 12 ratio of carbonates.

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