ba incorporation in benthic foraminifera
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ID: 187779
2017
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Abstract
Barium (Ba) incorporated in the calcite of many foraminiferal species is
proportional to the concentration of Ba in seawater. Since the open ocean
concentration of Ba closely follows seawater alkalinity, foraminiferal
Ba ∕ Ca can be used to reconstruct the latter. Alternatively, Ba ∕ Ca
from foraminiferal shells can also be used to reconstruct salinity in coastal
settings in which seawater Ba concentration corresponds to salinity as rivers
contain much more Ba than seawater. Incorporation of a number of minor and
trace elements is known to vary (greatly) between foraminiferal species, and
application of element ∕ Ca ratios thus requires the use of
species-specific calibrations. Here we show that calcite Ba ∕ Ca
correlates positively and linearly with seawater Ba ∕ Ca in cultured
specimens of two species of benthic foraminifera: Heterostegina
depressa and Amphistegina lessonii. The slopes of the regression,
however, vary two- to threefold between these two species (0.33 and 0.78,
respectively). This difference in Ba partitioning resembles the difference in
partitioning of other elements (Mg, Sr, B, Li and Na) in these foraminiferal
taxa. A general trend across element partitioning for different species is
described, which may help develop new applications of trace elements in
foraminiferal calcite in reconstructing past seawater chemistry.
| Reference Key |
nooijer2017biogeosciencesba
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|---|---|
| Authors | ;L. J. de Nooijer;A. Brombacher;A. Brombacher;A. Mewes;G. Langer;G. Nehrke;J. Bijma;G.-J. Reichart;G.-J. Reichart |
| Journal | tetrahedron letters |
| Year | 2017 |
| DOI |
10.5194/bg-14-3387-2017
|
| URL | |
| Keywords |
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