Ca isotope fractionation on the Earth and other solar system materials

Russell, W. A.; Papanastassiou, D. A.; Tombrello, T. A.

doi:10.1016/0016-7037(78)90105-9

Cited by 913 publications

(647 citation statements)

References 48 publications

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“…Ratios of 143 Nd/ 144 Nd were measured by multicollector-inductively coupled plasma-MS at Institut Français de Recherche pour l'Exploitation de la Mer (Brest, France) with a Thermo Neptune. All 143 Nd/ 144 Nd ratios were corrected for mass discrimination using 146 Nd/ 144 Nd = 0.7219 with an exponential law model (61). La Jolla Nd isotopic standard ( 143 Nd/ 144 Nd = 0.511858) measurements were performed to bracket two unknown samples for result normalization.…”

Section: Methodsmentioning

confidence: 99%

Abrupt drainage cycles of the Fennoscandian Ice Sheet

Soulet

Ménot

Bayon

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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Continental ice sheets are a key component of the Earth's climate system, but their internal dynamics need to be further studied. Since the last deglaciation, the northern Eurasian Fennoscandian Ice Sheet (FIS) has been connected to the Black Sea (BS) watershed, making this basin a suitable location to investigate former icesheet dynamics. Here, from a core retrieved in the BS, we combine the use of neodymium isotopes, high-resolution elemental analysis, and biomarkers to trace changes in sediment provenance and river runoff. We reveal cyclic releases of meltwater originating from Lake Disna, a proglacial lake linked to the FIS during Heinrich Stadial 1. Regional interactions within the climate-lake-FIS system, linked to changes in the availability of subglacial water, led to abrupt drainage cycles of the FIS into the BS watershed. This phenomenon raised the BS water level by ∼100 m until the sill of the Bosphorus Strait was reached, flooding the vast northwestern BS shelf and deeply affecting the hydrology and circulation of the BS and, probably, of the Marmara and Aegean Seas.ice dynamics | meltwater routing | European hydrographic network

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Section: Methodsmentioning

confidence: 99%

Abrupt drainage cycles of the Fennoscandian Ice Sheet

Soulet

Ménot

Bayon

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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“…For Faraday cup measurements of Os, the nine Fara- (Nier, 1937) was used for internal normalization using an exponential law (Russell et al, 1978). All other analytical conditions were the same as those adopted in ion counting mode.…”

Section: Os Measurement Proceduresmentioning

confidence: 99%

Simplified technique for the measurements of Re-Os isotope by multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS)

Liang

et al. 2010

Geochem. J.

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A method for the rapid determination of Re-Os isotopes by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) was developed. For Os measurements, samples were introduced into the plasma through conventional solution mode. The main Os memory occurs in the nebulizer; therefore, the use of a glass nebulizer rather than a Teflon nebulizer leads to a significant reduction in the Os memory effect. The Os memory is quickly and easily eliminated by washing the inlet system with 5% HCl-EtOH. The external reproducibility of the 187 Os/ 188 Os ratio of the Johnson-Matthey Chemical ICP (JMC) Os standard solution, as measured using the multi-ion counter system, is 0.07% (2σ, n = 12) for analyte amounts ranging from 0.1 to 1 ng total Os. Using MC-ICP-MS, the mean values of 187 Os/ 188 Os obtained for standards were found to be within analytical uncertainty of values obtained by negative thermal ionization mass spectrometry (N-TIMS). An improved mass-fractionation correction technique using Ir was applied to the isotopic analysis of Re. The present methods demonstrate the feasibility of MC-ICP-MS for precision measurements of the 187 Re-187 Os isotope system.

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“…Each measurement consisted of 50 consecutive isotope ratio measurements. Systematic isotope fractionation effects in the ion source were corrected by internal normalization technique using an exponential law (Russell et al, 1978 Creatinine analysis. Creatinine concentrations of the urine samples were determined using the method described by Jaffé (1886), which is based on the formation of a colored complex between picric acid (Riedel-de Haën, Buchs, Switzerland) and creatinine.…”

Section: Methodsmentioning

confidence: 99%

Urinary excretion of an intravenous 26Mg dose as an indicator of marginal magnesium deficiency in adults

et al. 2005

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Background: Measurement of magnesium (Mg) status is problematic because tissue Mg deficiency can be present without low serum Mg concentrations. Objective: To evaluate a modified version of the Mg retention test using stable isotopes for the assessment of Mg status in general, and the detection of marginal Mg deficiency in particular. Design: A modified version of the Mg retention test using a small dose of 26 Mg was evaluated for assessment of Mg status in 22 healthy subjects. Muscle Mg concentration was used as reference for Mg status. A muscle biopsy was taken from the lateral portion of the quadriceps muscle from each subject. After 2 to 4 weeks, 11 mg of 26 Mg (as MgCl 2 in 14 ml water) were injected i.v. over a period of 10 min and all urine was collected for the following 24 h. Excretion of the isotopic label was expressed as percentage of the administered dose excreted in urine within 24 h. Results: Mean7s.d. Mg concentration in muscle was 3.8570.17 mmol/100 g fat-free dried solids. Mean7s.d. excretion of the injected dose within 24 h was 7.972.1%. No correlation was found between muscle Mg concentration and excretion of the isotopic label (r 2 ¼ 0.061, P ¼ 0.27). Conclusions: In this study, urinary excretion of an intravenous Mg tracer was not influenced by muscle Mg concentration and its usefulness for the detection of marginal Mg deficiency could therefore not be demonstrated. Sponsorship:

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Ca isotope fractionation on the Earth and other solar system materials

Cited by 913 publications

References 48 publications

Abrupt drainage cycles of the Fennoscandian Ice Sheet

Abrupt drainage cycles of the Fennoscandian Ice Sheet

Simplified technique for the measurements of Re-Os isotope by multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS)

Urinary excretion of an intravenous 26Mg dose as an indicator of marginal magnesium deficiency in adults

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