Mg/Ca composition of benthic foraminifera Miliolacea as a new tool of paleoceanography

Sadekov, Aleksey; Bush, Flora; Kerr, Joanna; Ganeshram, Raja S.; Elderfield, Henry

doi:10.1002/2014pa002654

Cited by 15 publications

(13 citation statements)

References 53 publications

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“…are in the range of 0.015 and 0.045, increasing significantly with decreasing Mg/Ca sw . These coefficients are similar to those of previously analyzed porcelaneous foraminifera (Maeda et al, ; Raja et al, ; Sadekov et al, ; Toyofuku et al, ). In species in which magnesium is incorporated at high concentrations (>100 mmol/mol Ca), Mg/Ca cc increases linearly with temperature with a sensitivity of 1.6‐2.9 mmol/mol Mg/Ca increase for every degree of temperature increase (Maeda et al, ; Toyofuku et al, ; Toyofuku & Kitazato, ;).…”

Section: Discussionsupporting

confidence: 89%

The Impacts of Seawater Mg/Ca and Temperature on Element Incorporation in Benthic Foraminiferal Calcite

Nooijer

Dijk

Toyofuku

et al. 2017

Geochem Geophys Geosyst

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On geological timescales, oceanic [Mg2+] and [Ca2+] vary with changing rates of weathering, seafloor spreading and dolomite formation. Accurate reconstruction of the ratio between [Mg2+] and [Ca2+] in seawater (Mg/Casw), may potentially be reconstructed using foraminiferal Mg/Ca ratios. Since both temperature and seawater Mg/Ca impact foraminiferal Mg/Ca, successful reconstruction of Mg/Casw requires quantification of both these parameters independently on foraminiferal Mg/Ca, as well as their combined effect on Mg‐incorporation. Here we present the combined and isolated impacts of temperature and Mg/Casw on Mg incorporation in two model species, the benthic hyaline (i.e., perforate) foraminifer Elphidium crispum and porcelaneous (i.e., miliolid) foraminifer Quinqueloculina sp. using controlled growth experiments. Specimens of these two species were kept at four different temperatures (ranging from 10 to 27°C) and three Mg/Casw's (3.4, 6.4 and 8.5 mol/mol), resulting in 12 experimental conditions. Newly grown calcite was analyzed for a number of elements (Na, Mg and Sr) by laser ablation‐ICP‐MS. Results show that although the Mg/Ca varied by more than an order of magnitude between species, the sensitivity of Mg incorporation with respect to temperature appeared not to be influenced by Mg/Casw. By extension, these results may also help improving accuracy in the reconstruction of past Mg/Casw based on foraminifera with contrasting Mg/Ca.

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Section: Discussionsupporting

confidence: 89%

The Impacts of Seawater Mg/Ca and Temperature on Element Incorporation in Benthic Foraminiferal Calcite

Nooijer

Dijk

Toyofuku

et al. 2017

Geochem Geophys Geosyst

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“…Generally, concentrations for these elements correlate within taxa and hence species incorporating relatively much Mg also have high (for example) Sr / Ca, B / Ca and Na / Ca. Miliolids and many large benthic foraminifera (LBF) produce calcite with Mg / Ca of up to 100-150 mmol mol −1 (Toyofuku et al, 2000;Dueñas-Bohórquez et al, 2011;Sadekov et al, 2014;Evans et al, 2015), while most planktonic and symbiont-barren benthic foraminifera produce test calcite with Mg / Ca values ranging from 1 to 10 mmol mol −1 (e.g., Nürnberg et al, 1996;Elderfield et al, 2002;Lear et al, 2010;Wit et al, 2012;De Nooijer et al, 2014b). The same distinction is observed for B / Ca (compare, for example, Allen et al, 2012, andKazcmarek et al, 2015), Li / Ca (Lear et al, 2010, versus Evans et al, 2015, Na / Ca (Wit et al, 2013, versus Evans et al, 2015 and Sr / Ca (e.g., Dueñas-Bohórquez et al, 2011).…”

Section: Biomineralization and Element Incorporationmentioning

confidence: 99%

“…Ba / Ca in planktonic species may be used to reconstruct (changes in) open ocean alkalinity (Lea, 1995), whereas those published for benthics may be more suitable to reconstruct salinity in coastal and shelf seas (Weldeab et al, 2007(Weldeab et al, , 2014Bahr et al, 2013). The range in Mg / Ca is known particularly for benthic foraminifera (e.g., Toyofuku et al, 2011;Sadekov et al, 2014) and interspecies variability in Ba incorporation may therefore hamper application of (benthic) foraminiferal Ba / Ca. Here we present results from a culture study using the larger benthic foraminifera, Amphistegina lessonii and Heterostegina depressa, two species with different Mg / Ca (∼ 50 mmol mol −1 ; Segev and Erez, 2006 and ∼ 120 mmol mol −1 ; Dueñas-Bohórquez et al, 2011, respectively).…”

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confidence: 99%

Ba incorporation in benthic foraminifera

et al. 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.

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“…Generally, concentrations for these elements correlate within taxa and hence species incorporating relatively much Mg, also have high (for example) Sr/Ca, B/Ca and Na/Ca. Miliolids and many 'Large Benthic Foraminifera' (LBF) produce calcite with Mg/Ca up to 100-150 mmol/mol (Toyofuku et al, 2000;Dueñas-Bohórquez et al, 2011;Sadekov et al, 2014;Evans et al, 2015), while most planktonic and symbiont-barren benthic foraminifera produce test calcite with Mg/Ca values ranging from 1-10 mmol/mol (e.g. Nürnberg et al, 1996;Elderfield et al, 2002;Lear et al, 2010;Wit et al, 2012;De Nooijer et al, 2014b).…”

Section: Biomineralization and Element Incorporationmentioning

confidence: 99%

Ba incorporation in benthic foraminifera

Nooijer¹,

Brombacher²,

Mewes³

et al. 2017

Preprint

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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 where 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 2&#8211;3 fold 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 developing new applications of trace elements in foraminiferal calcite in reconstructing past seawater chemistry.

show abstract

Mg/Ca composition of benthic foraminifera Miliolacea as a new tool of paleoceanography

Cited by 15 publications

References 53 publications

The Impacts of Seawater Mg/Ca and Temperature on Element Incorporation in Benthic Foraminiferal Calcite

The Impacts of Seawater Mg/Ca and Temperature on Element Incorporation in Benthic Foraminiferal Calcite

Ba incorporation in benthic foraminifera

Ba incorporation in benthic foraminifera

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