Coprecipitation of strontium with marine Ca-Mg carbonates.

Ohde, Shigeru; Kitano, Yasushi

doi:10.2343/geochemj.18.143

Cited by 25 publications

(15 citation statements)

References 16 publications

(7 reference statements)

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“…The average Sr/Ca ratio of our oyster material of 0.82 mmol/mol ( n = 271) compares well with data published for oyster shell material of Malleus albus (0.81 mmol/mol, n = 1), C. gigas (0.83 mmol/mol, n = 268), Crassostrea virginica (0.86 mmol/mol, n = 10), and Saxostrea gigas (1.06 mmol/mol, n = 1) [ Lerman , ; Ohde and Kitano , ; Almeida et al ., ]. Weak negative correlations of Sr/Ca ratios with oxygen isotope values (Figure b) indicate that seasonal effects may play a role in the incorporation of Sr into the shell of C. gigas .…”

Section: Discussionmentioning

confidence: 99%

The Giant Pacific Oyster (Crassostrea gigas) as a modern analog for fossil ostreoids: Isotopic (Ca, O, C) and elemental (Mg/Ca, Sr/Ca, Mn/Ca) proxies

Ullmann

Böhm

Rickaby

et al. 2013

Geochem Geophys Geosyst

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[1] Modern analogs are an essential part of palaeoclimate studies, because they provide the basis for the understanding of geochemical signatures of fossils. Ostreoids are common in many sedimentary sequences and because of their fast growth, high temporal resolution sampling of past seasonal variability is possible. Here, two shell structures of modern Giant Pacific Oysters (Crassostrea gigas), the chalky substance and foliate layers, have been sampled for trace element distributions (Mg, Sr, Mn) and stable isotope variability (C, O, Ca). Oxygen isotopes exhibit a clear seasonal signature. Mean carbon isotope values of different oysters agree within 0.1%, but ontogenic variability is complicated by shell growth patterns and potential small vital effects. The calcium isotope ratios are found to be constant throughout ontogeny within analytical precision at a value of 44/40 Ca ¼ 0.68 6 0.16% (2 sd) SRM-915a which is consistent with other bivalve species. Calcium isotope ratios in oyster shell material might thus be a possible proxy for palaeo seawater calcium isotope ratios. Element/Ca ratios are significantly higher in the chalky substance than in the foliate layers and especially high Sr/Ca and Mn/Ca ratios are observed for the first growth season of the oysters. Mg/Ca ratios in the chalky substance show a negative correlation with 18 O values, compatible with a temperature dependence, whereas this correlation is absent in the foliate layers. Seasonal changes of Sr/Ca are controlled by metabolic processes, whereas for Mn/Ca an additional environmental control is evident.

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Section: Discussionmentioning

confidence: 99%

The Giant Pacific Oyster (Crassostrea gigas) as a modern analog for fossil ostreoids: Isotopic (Ca, O, C) and elemental (Mg/Ca, Sr/Ca, Mn/Ca) proxies

Ullmann

Böhm

Rickaby

et al. 2013

Geochem Geophys Geosyst

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“…A large body of work exists describing potential controls on the Sr/Ca in inorganic calcite. It has been observed that Sr/Ca ratios increase with precipitation rate (Lorens, 1981;Mucci and Morse, 1983;Morse and Bender, 1990;Tesoriero and Pankow, 1996), with the Sr/Ca ratio of the solution from which precipitation occurs (Mucci and Morse, 1983;Pingitore and Eastman, 1986;Carpenter and Lohmann, 1992) and with increasing Mg concentration of the solution and solid mineral phases, since higher Mg concentrations increase mineral solubility and the incorporation of other elements by distorting the mineral lattice (Mucci and Morse, 1983;Ohde and Kitano, 1984;Morse and Bender, 1990;Carpenter and Lohmann, 1992). Mineral precipitation rates also currently are seen as a major control of biogenic Sr/Ca ratios in foraminifera , coccoliths (Stoll and Schrag, 2000;Rickaby et al, 2002) and bivalves, e.g.…”

Section: Shell Sr/ca Ratios In P Maximus Shellsmentioning

confidence: 98%

Environmental and biological controls on elemental (Mg/Ca, Sr/Ca and Mn/Ca) ratios in shells of the king scallop Pecten maximus

Freitas

Clarke

Kennedy

et al. 2006

Geochimica et Cosmochimica Acta

154

161

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“…and H. depressa follows the pure inorganic fractionation. Mucci and Morse (1983) and Ohde and Kitano (1984) showed that higher Mg/Ca Cc and Mg/Ca sw also favours Sr incorporation into CaCO 3 . This may explain some of the variation in D Sr in our Heterostegina experiments, which showed an increase with increasing Mg/Ca Cc (Fig.…”

Section: Possible Role Of Mg/ca Sw On Mg and Sr Incorporationmentioning

confidence: 99%

Incorporation of Mg and Sr in calcite of cultured benthic foraminifera: impact of calcium concentration and associated calcite saturation state

et al. 2010

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Abstract.We investigated the effect of the calcium concentration in seawater and thereby the calcite saturation state ( ) on the magnesium and strontium incorporation into benthic foraminiferal calcite under laboratory conditions. For this purpose individuals of the shallow-water species Heterostegina depressa (precipitating high-Mg calcite, symbiont-bearing) and Ammonia tepida (low-Mg calcite, symbiont-barren) were cultured in media under a range of [Ca 2+ ], but similar Mg/Ca ratios. Trace element/Ca ratios of newly formed calcite were analysed with Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) and normalized to the seawater elemental composition using the equation D TE =(TE/Ca calcite )/(TE/Ca seawater ). The culturing study shows that D Mg of A. tepida significantly decreases with increasing at a gradient of −4.3×10 −5 per unit. The D Sr value of A. tepida does not change with , suggesting that fossil Sr/Ca in this species may be a potential tool to reconstruct past variations in seawater Sr/Ca. Conversely, D Mg of H. depressa shows only a minor decrease with increasing , while D Sr increases considerably with at a gradient of 0.009 per unit. The different responses to seawater chemistry of the two species may be explained by a difference in the calcification pathway that is, at the same time, responsible for the variation in the total Mg incorporation between the two species. Since the Mg/Ca ratio in H. depressa is 50-100 times higher than that of A. tepida, it is suggested that the latter exhibits a mechanism that deCorrespondence to: M. Raitzsch (raitzsch@uni-bremen.de) creases the Mg/Ca ratio of the calcification fluid, while the high-Mg calcite forming species may not have this physiological tool. If the dependency of Mg incorporation on seawater [Ca 2+ ] is also valid for deep-sea benthic foraminifera typically used for paleostudies, the higher Ca concentrations in the past may potentially bias temperature reconstructions to a considerable degree. For instance, 25 Myr ago Mg/Ca ratios in A. tepida would have been 0.2 mmol/mol lower than today, due to the 1.5 times higher [Ca 2+ ] of seawater, which in turn would lead to a temperature underestimation of more than 2 • C.

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Coprecipitation of strontium with marine Ca-Mg carbonates.

Cited by 25 publications

References 16 publications

The Giant Pacific Oyster (Crassostrea gigas) as a modern analog for fossil ostreoids: Isotopic (Ca, O, C) and elemental (Mg/Ca, Sr/Ca, Mn/Ca) proxies

The Giant Pacific Oyster (Crassostrea gigas) as a modern analog for fossil ostreoids: Isotopic (Ca, O, C) and elemental (Mg/Ca, Sr/Ca, Mn/Ca) proxies

Environmental and biological controls on elemental (Mg/Ca, Sr/Ca and Mn/Ca) ratios in shells of the king scallop Pecten maximus

Incorporation of Mg and Sr in calcite of cultured benthic foraminifera: impact of calcium concentration and associated calcite saturation state

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