Physics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1505g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 7, pp.1505-1512
Physics
10
Scientific paper
Carbon and oxygen isotopic analyses have been performed on live-stained aragonitic and calcitic benthic foraminifera and dissolved inorganic carbon (DIC) from the Southern California Borderland to examine carbon isotopic fractionation in foraminifera. Temperature, salinity and pH data have also been collected to permit accurate determination of the 13 C of bicarbonate ion and thus aragonite-HCO 3 and calcite-HCO - 3 isotopic enrichment factors ( ar-b and cl-b , respectively). Only species which precipitate in 18 O equilibrium have been considered. ar-b values based on Hoeglundina elegans range from 1.9%. at 2.7°C to 1.1%. at 9.5°C. Only the lower temperature values agree with a tentative carbon isotope equilibrium equation for aragonite based on the data of and (1969) and Emrich et al. (1970). The temperature dependence of ar-b is considerably greater than the equilibrium equation would predict and may be due to a vital effect. The calcitic foraminifera Cassidulina tortuosa, Cassidulina braziliensis , and Cassidulina limbata , Bank and Terrace dwellers, have similar 13 C values and yield an average cl-b value of -0.2 ± .1%. between 8° and 10°C. Calcitic Uvigerina curticosta, Uvigerina peregrina , and megalospheric B. argentea , Slope and Basin dwellers, are -0.7 ± .1%. enriched relative to ambient bicarbonate for 3 to 9°C. No temperature dependence for cl-b was observed for the species in either habitat. The cl-b values for Cassidulina species are close (± 0.3%.) to the values given by the tentative equilibrium curve for calcite, while Uvigerina and Bolivina species give values 0.2-0.8%. less. The cl-b difference between the Cassidulina species and the Uvigerina and Bolivina species is attributed to the incorporation of 13 C-depleted pore water DIC by the latter group rather than to taxonomic or temperature differences.
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