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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)


Journal of Sedimentary Petrology
Vol. 51 (1981)No. 2. (June), Pages 459-465

Stable Isotope Composition of Benthic Calcareous Algae from Bermuda

Gerold Wefer, Wolfgang H. Berger


Carbonate secreted by benthic algae from Bermuda (5 genera, 3 phyla) can be grouped into four types according to the ^dgr18O and ^dgr13C composition: a "heavy" and a "light" set for oxygen, and a "large-variability" and a "small-variability" set for carbon. The sets are not congruent. In one alga, different parts of the same skeleton belong to different oxygen sets. Vital effects, which are tied to developmental stages as well as to environmental response, are predominant in producing the observed isotopic variations.

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