The interaction of magnesium with calcite during crystal growth at 25–90°C and one atmosphere

Katz, Amitai

doi:10.1016/0016-7037(73)90091-4

Cited by 306 publications

(143 citation statements)

References 32 publications

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“…Empirical Sr and Li partition coefficients for O. umbonatus (0.09-0.11 and 0.005-0.0075, respectively) are larger than the inorganic calcite partition coefficients (0.04 and 0.004, Lorens, 1978Lorens, , 1981Elderfield et al, 1996;Okumura and Kitano, 1986), but less than one, consistent with calcification from a semi-enclosed pool that is modified via Rayleigh fractionation. In contrast, Mg and B empirical partition coefficients for O. umbonatus (0.00017-0.00068 and 0.0005-0.0014 respectively) are significantly lower than the inorganic partition coefficients (0.0573 and 0.38-4.0 respectively, Katz, 1973;Gabitov et al, 2011;Hemming et al, 1995). This observation does not preclude a Rayleigh fractionation mechanism in O. umbonatus, but indicates that for Mg and B, either the fractionation factor from the internal pool is significantly smaller than the inorganic partition coefficient, or there are additional mechanisms contributing to the partition coefficients.…”

Section: Rayleigh Fractionationmentioning

confidence: 74%

Relationships between bottom water carbonate saturation and element/Ca ratios in coretop samples of the benthic foraminifera <i>Oridorsalis umbonatus</i>

Dawber

Tripati

2012

Biogeosciences

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Abstract. Elemental ratios in benthic foraminifera have been used to reconstruct bottom water temperature and carbonate saturation ). We present elemental data for the long-ranging benthic foraminifera Oridorsalis umbonatus from sediment core tops that span a narrow range of temperatures and a wide range of saturation states. B/Ca, Li/Ca, Sr/Ca and Mg/Ca ratios exhibit positive correlations with bottom water carbonate saturation. The sensitivity of individual element/calcium ratios to bottom water [CO To assess the fidelity of these relationships and the possibility of applying these relationships to earlier periods of Earth history, we examine the mechanisms governing elemental incorporation into foraminiferal calcite. Empirical partition coefficients for Li and Sr are consistent with Rayleigh fractionation from an internal pool used for calcification. For O. umbonatus and other benthic species, we show that the fraction of Ca remaining in the pool is a function of bottom water [CO 2− 3 ], and can be explained by either a growth rate effect and/or the energetic cost of raising vesicle pH at the site of calcification. Empirical partition coefficients for Mg and B may also be controlled by Rayleigh fractionation, but require that either the fractionation factor from the internal pool is smaller than the inorganic partition coefficient and/or additional fractionation mechanisms. O. umbonatus element ratio data may also be consistent with fractionation according to the surface entrapment model and/or the presence of discrete high-and low-Mg calcite phases. However, at present we are limited in our ability to assess these mechanisms. The new X/Ca data for O. umbonatus provide constraints to test the role of these mechanisms in the future.

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Section: Rayleigh Fractionationmentioning

confidence: 74%

Relationships between bottom water carbonate saturation and element/Ca ratios in coretop samples of the benthic foraminifera <i>Oridorsalis umbonatus</i>

Dawber

Tripati

2012

Biogeosciences

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“…Kinsman and Holland, 1969;Katz, 1973;Mucci, 1987;Oomori et al, 1987). As discussed by Rosenthal et al (1997) and Lea et al (1999) thermodynamic considerations predict that the temperature dependence of Mg uptake into calcite should be exponential, with a sensitivity of around 3% per 1C increase in temperature.…”

Section: Calibration Of Planktonic Foraminiferal Mg/ca Versus Temperamentioning

confidence: 99%

Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum

Barker

Cacho

Benway

et al. 2005

Quaternary Science Reviews

235

163

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As part of the Multi-proxy Approach for the Reconstruction of the Glacial Ocean (MARGO) incentive, published and unpublished temperature reconstructions for the Last Glacial Maximum (LGM) based on planktonic foraminiferal Mg/Ca ratios have been synthesised and made available in an online database. Development and applications of Mg/Ca thermometry are described in order to illustrate the current state of the method. Various attempts to calibrate foraminiferal Mg/Ca ratios with temperature, including culture, trap and core-top approaches have given very consistent results although differences in methodological techniques can produce offsets between laboratories which need to be assessed and accounted for where possible. Dissolution of foraminiferal calcite at the sea-floor generally causes a lowering of Mg/Ca ratios. This effect requires further study in order to account and potentially correct for it if dissolution has occurred. Mg/Ca thermometry has advantages over other paleotemperature proxies including its use to investigate changes in the oxygen isotopic composition of seawater and the ability to reconstruct changes in the thermal structure of the water column by use of multiple species from different depth and or seasonal habitats. Presently available data are somewhat limited to low latitudes where they give fairly consistent values for the temperature difference between Late Holocene and the LGM (2-3.5 1C). Data from higher latitudes are more sparse, and suggest there may be complicating factors when comparing between multi-proxy reconstructions. r

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“…1). Most foraminiferal species incorporate Mg with one to two orders of magnitude lower concentration compared to non-biologically precipitated calcium carbonate (Katz, 1973;Bender et al, 1975;Bentov and Erez, 2006). The concentration of barium, on the other hand, is~10 times higher in foraminiferal calcite (Lea and Boyle, 1991;Lea and Spero, 1992) compared to inorganic precipitation results (Pingitore and Eastman, 1984).…”

Section: Introductionmentioning

confidence: 99%

Biomineralization in perforate foraminifera

Nooijer

Spero

Erez

et al. 2014

Earth-Science Reviews

201

190

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a b s t r a c t a r t i c l e i n f oIn this paper, we review the current understanding of biomineralization in perforate foraminifera. Ideas on the mechanisms responsible for the flux of Ca 2+ and inorganic carbon from seawater into the test were originally based on light and electron microscopic observations of calcifying foraminifera. From the 1980s onward, tracer experiments, fluorescent microscopy and high-resolution test geochemical analysis have added to existing calcification models. Despite recent insights, no general consensus on the physiological basis of foraminiferal biomineralization exists. Current models include seawater vacuolization, transmembrane ion transport, involvement of organic matrices and/or pH regulation, although the magnitude of these controls remain to be quantified. Disagreement between currently available models may be caused by the use of different foraminiferal species as subject for biomineralization experiments and/or lack of a more systematic approach to study (dis)similarities between taxa. In order to understand foraminiferal controls on element incorporation and isotope fractionation, and thereby improve the value of foraminifera as paleoceanographic proxies, it is necessary to identify key processes in foraminiferal biomineralization and formulate hypotheses regarding the involved physiological pathways to provide directions for future research.

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The interaction of magnesium with calcite during crystal growth at 25–90°C and one atmosphere

Cited by 306 publications

References 32 publications

Relationships between bottom water carbonate saturation and element/Ca ratios in coretop samples of the benthic foraminifera <i>Oridorsalis umbonatus</i>

Relationships between bottom water carbonate saturation and element/Ca ratios in coretop samples of the benthic foraminifera <i>Oridorsalis umbonatus</i>

Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum

Biomineralization in perforate foraminifera

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The interaction of magnesium with calcite during crystal growth at 25–90°C and one atmosphere

Cited by 306 publications

References 32 publications

Relationships between bottom water carbonate saturation and element/Ca ratios in coretop samples of the benthic foraminifera &lt;i&gt;Oridorsalis umbonatus&lt;/i&gt;

Relationships between bottom water carbonate saturation and element/Ca ratios in coretop samples of the benthic foraminifera &lt;i&gt;Oridorsalis umbonatus&lt;/i&gt;

Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum

Biomineralization in perforate foraminifera

Contact Info

Product

Resources

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Relationships between bottom water carbonate saturation and element/Ca ratios in coretop samples of the benthic foraminifera <i>Oridorsalis umbonatus</i>

Relationships between bottom water carbonate saturation and element/Ca ratios in coretop samples of the benthic foraminifera <i>Oridorsalis umbonatus</i>