Fehrenbacher, Jennifer; Russell, Ann D; Davis, Catherine V; Spero, Howard J; Chu, Edward; Hönisch, Bärbel (2018): Barium/calcium ratios in planktic foraminifer Neogloboquadrina dutertrei [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.895794, Supplement to: Fehrenbacher, J et al. (2018): Ba/Ca ratios in the non-spinose planktic foraminifer Neogloboquadrina dutertrei: Evidence for an organic aggregate microhabitat. Geochimica et Cosmochimica Acta, 236, 361-372, https://doi.org/10.1016/j.gca.2018.03.008
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Abstract:
Dataset contains seawater and foraminiferal chemical composition from the paper referenced above. Paper abstract: Ba/Ca ratios in many non-spinose planktic foraminifera are markedly higher than those observed in spinose planktic species, but the cause for these high Ba/Ca ratios is not understood. A better understanding of this geochemical anomaly could provide insights into the habitat and/or controls over Ba incorporation in these species and expand their utility in paleoclimate research. In spinose species, shell Ba/Ca depends only on the Ba/Ca ratio of seawater. Proposed explanations for high non-spinose Ba/Ca include (1) the empirical partition coefficient, DBa, differs from the spinose species, (2) shell Ba varies with seawater temperature and pH, or (3) non-spinose foraminifers have a preference for prey that has elevated Ba. We performed laboratory culture experiments to determine DBa for the thermocline-dwelling non-spinose planktic foraminifer Neogloboquadrina
dutertrei. We find that the Ba/Ca ratio of foraminiferal calcite secreted in the laboratory varies linearly with the Ba/Ca ratio of the seawater. The DBa for this species, 0.11 ± 0.008 (2SE; 95% CL), is similar to the DBa for spinose species (0.13 ± 0.004, 2SE; 95% CL). As in spinose species, the Ba/Ca ratio of cultured specimens of N. dutertrei is not influenced by
culture temperature (12-22 °C) or seawater pHNBS (range 7.8-8.3). However, the Ba/Ca ratio of individual plankton-tow N. dutertrei specimens that completed their lifecycle in the ocean exceeds the Ba/Ca ratio of cultured specimens by up to three orders of magnitude. It is unlikely this difference between cultured specimens and ocean-grown specimens is due to seawater [Ba] variability, since seawater Ba/Ca ratios calculated using our DBa are much higher than exist in the ocean. Rather, we suggest that elevated shell Ba/Ca in plankton tow and fossil N. dutertrei is due to calcification in the microenvironment of marine organic aggregates such as marine snow, where [Ba] is elevated as a result of Ba release from biogenic particulates.
Coverage:
Median Latitude: 33.488950 * Median Longitude: -118.442375 * South-bound Latitude: 33.468600 * West-bound Longitude: -118.456500 * North-bound Latitude: 33.550000 * East-bound Longitude: -118.400000
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
4 datasets
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Datasets listed in this publication series
- Fehrenbacher, J; Russell, AD; Davis, CV et al. (2018): Barium/calcium and strontium/calcium ratios in planktic foraminifer Neogloboquadrina dutertrei from San Pedro Basin. https://doi.org/10.1594/PANGAEA.895793
- Fehrenbacher, J; Russell, AD; Davis, CV et al. (2018): Average barium/calcium ratios of cultured foraminifer specimens of Neogloboquadrina dutertrei, listed by experiment. https://doi.org/10.1594/PANGAEA.895792
- Fehrenbacher, J; Russell, AD; Davis, CV et al. (2018): Seawater trace element data and pre- and post-foraminifer experiment alkalinity and pH. https://doi.org/10.1594/PANGAEA.895791
- Fehrenbacher, J; Russell, AD; Davis, CV et al. (2018): Seawater chemistry in San Pedro Basin. https://doi.org/10.1594/PANGAEA.895790