High-precision measurement of magnesium isotopes by multiple-collector inductively coupled plasma mass spectrometry

Galy, Αlbert; Belshaw, N.S.; Halicz, Ludwik; O’Nions, R.K.

doi:10.1016/s1387-3806(01)00380-3

Cited by 227 publications

(251 citation statements)

References 32 publications

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“…48 Ca 2+ , 48 Ti 2+ , 50 Ti 2+ , 50 V 2+ , 50 Cr 2+ , and 52 Cr 2+ ) was minimal. Galy et al (2001), however, demonstrated that the presence of Na + and other species within the sample matrix could also result in mass bias effects. Consequently all samples were chemically purified prior to Mg isotope analysis via cation exchange chromatography.…”

Section: Magnesium Isotope Analysesmentioning

confidence: 99%

“…Complete recovery of Mg from the columns, which is essential to avoid isotopic fractionation (Chang et al, 2003;Teng et al, 2007) was confirmed by replicate passes of samples with different matrices through the resin column (Pearce et al, 2009). A single pass was generally sufficient to reduce the cation/Mg ratio in the sample to <0.05, thereby avoiding potential interferences during mass spectrometry analysis (Galy et al, 2001).…”

Section: Magnesium Isotope Analysesmentioning

confidence: 99%

“…All solutions were prepared in 0.32 M HNO 3 and were introduced into the Ar plasma using a standard spray chamber. Instrumental mass fractionation effects were corrected via sample-standard bracketing, and all results are presented in delta notation with respect to the DSM3 international reference material (Galy et al, 2001;Goldstein et al, 2003):…”

Section: Magnesium Isotope Analysesmentioning

confidence: 99%

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Magnesium isotope fractionation during hydrous magnesium carbonate precipitation with and without cyanobacteria

Mavromatis

Pearce

Shirokova

et al. 2012

Geochimica et Cosmochimica Acta

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How to cite:Mavromatis, Vasileios; Pearce, Christopher R.; Shirokova, Liudmila S.; Bundeleva, Irina A.; Pokrovsky, Oleg S.; Benezeth, Pascale and Oelkers, Eric H. (2012) AbstractThe hydrous magnesium carbonates, nesquehonite (MgCO 3 Á3H 2 O) and dypingite (Mg 5 (CO 3 ) 4 (OH) 2 Á5(H 2 O)), were precipitated at 25°C in batch reactors from aqueous solutions containing 0.05 M NaHCO 3 and 0.025 M MgCl 2 and in the presence and absence of live photosynthesizing Gloeocapsa sp. cyanobacteria. Experiments were performed under a variety of conditions; the reactive fluid/bacteria/mineral suspensions were continuously stirred, and/or air bubbled in most experiments, and exposed to various durations of light exposure. Bulk precipitation rates are not affected by the presence of bacteria although the solution pH and the degree of fluid supersaturation with respect to magnesium carbonates increase due to photosynthesis. Lighter Mg isotopes are preferentially incorporated into the precipitated solids in all experiments. Mg isotope fractionation between the mineral and fluid in the abiotic experiments is identical, within uncertainty, to that measured in cyanobacteriabearing experiments; measured d 26 Mg ranges from À1.54& to À1.16& in all experiments. Mg isotope fractionation is also found to be independent of reactive solution pH and Mg, CO 3 2À , and biomass concentrations. Taken together, these observations suggest that Gloeocapsa sp. cyanobacterium does not appreciably affect magnesium isotope fractionation between aqueous fluid and hydrous magnesium carbonates.

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Section: Magnesium Isotope Analysesmentioning

confidence: 99%

Section: Magnesium Isotope Analysesmentioning

confidence: 99%

Section: Magnesium Isotope Analysesmentioning

confidence: 99%

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Magnesium isotope fractionation during hydrous magnesium carbonate precipitation with and without cyanobacteria

Mavromatis

Pearce

Shirokova

et al. 2012

Geochimica et Cosmochimica Acta

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“…Following chemical separation, all samples were dissolved in 0.3N HNO 3 and centrifuged before introduction into the mass spectrometer. High-precision Mg isotopic abundances were obtained with a Nu-instruments MC-ICPMS (Galy et al, 2001). All samples and standards were introduced into the plasma torch through an Aridus desolvating nebulizer.…”

Section: Magnesium Isotopic Analysismentioning

confidence: 99%

Primordial compositions of refractory inclusions

Grossman

Simon

Vinai

et al. 2008

Geochimica et Cosmochimica Acta

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Bulk chemical and oxygen, magnesium and silicon isotopic compositions were measured for each of 17 Types A and B refractory inclusions from CV3 chondrites. After bulk chemical compositions were corrected for non-representative sampling in the laboratory, the Mg and Si isotopic compositions of each inclusion were used to calculate its original chemical composition assuming that the heavy-isotope enrichments of these elements are due to Rayleigh fractionation that accompanied their evaporation from CMAS liquids. The resulting pre-evaporation chemical compositions are consistent with those predicted by equilibrium thermodynamic calculations for high-temperature nebular condensates but only if different inclusions condensed from nebular regions that ranged in total pressure from 10 -6 to 10 -1 bar, regardless of whether they formed in a system of solar composition or in one enriched in OC dust relative to gas by a factor of ten relative to solar composition. This is similar to the range of total pressures predicted by dynamic models of the solar nebula for regions whose temperatures are in the range of silicate condensation temperatures. Alternatively, if departure from equilibrium condensation and/or non-representative sampling of condensates in the nebula occurred, the inferred range of total pressure could be smaller. Simple kinetic modeling of evaporation successfully reproduces observed chemical compositions of most inclusions from their inferred pre-evaporation compositions, suggesting that closed-system isotopic exchange processes did not have a significant effect on their isotopic compositions. Comparison of pre-evaporation compositions with observed ones indicates that 80% of the enrichment in refractory CaO + Al 2 O 3 relative to more volatile MgO + SiO 2 is due to initial condensation and 20% due to subsequent evaporation for both Type A and Type B inclusions.

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“…There is some evidence in the literature of isotopic fractionation in both chlorophyll-a and -b (Galy et al, 2001). Young and Galy (2004) However, the magnesium-isotopic composition of the culture medium from which the spinach was grown was not known, as they used chlorophylls from a commercial source for their study.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of magnesium-isotope fractionation in chlorophyll-a photosynthesis

Black

Yin

Casey

2006

Geochimica et Cosmochimica Acta

115

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High-precision measurement of magnesium isotopes by multiple-collector inductively coupled plasma mass spectrometry

Cited by 227 publications

References 32 publications

Magnesium isotope fractionation during hydrous magnesium carbonate precipitation with and without cyanobacteria

Magnesium isotope fractionation during hydrous magnesium carbonate precipitation with and without cyanobacteria

Primordial compositions of refractory inclusions

An experimental study of magnesium-isotope fractionation in chlorophyll-a photosynthesis

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