Fractionation of the stable isotopes of carbon and oxygen in marine calcareous organisms--the Echinoidea. Part I. Variation of C 13 and O 18 content within individuals

Details Fractionation of the stable isotopes of carbon and oxygen in marine calcareous organisms--the Echinoidea. Part I. Variation of C 13 and O 18 content within individuals Fractionation of the stable isotopes of carbon and oxygen in marine calcareous organisms--the Echinoidea. Part I. Variation of C 13 and O 18 content within individuals

Jul 1966

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..681w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 30, Issue 7, pp.681-703

Mathematics

Logic

3

Scientific paper

Detailed environmental analysis of ancient carbonate rocks using geochemical criteria such as C 13 -C 12 and O 18 -O 16 ratios is dependent upon an understanding of the relationships between the isotopic composition of modern sediments (and the calcareous organisms which contribute to sediment formation) and the various parameters of the environment. A systematic study of the distribution of C 13 and O 18 in the calcite skeletons of recent sea urchins and sand dollars has demonstrated that these animals fractionate both carbon and oxygen isotopes to a considerable extent. Systematic variation of C 13 within a single skeleton may amount to as much as 13 per mil. In general, the coronal plates of the test are greatly enriched in C 12 with respect to the spines, but the isotopic compositions of the spines are similar to those of most other marine invertebrates, such as the molluscs, foraminifera etc. The different morphological parts of the echinoid lantern differ in C 13 and O 18 values to the extent of several per mil; C 13 and O 18 for these parts are strongly correlated, suggesting incorporation of varying amounts of CO 3 post|staggered|2- of different isotopic composition from different sources, perhaps from mixtures of metabolic CO 2 and seawater bicarbonate in varying proportions. Variation in the degree of isotope fractionation during growth appears to be relatively small.

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