New methods for determination of the mass-independent and mass-dependent platinum isotope compositions of iron meteorites by MC-ICP-MS

Abstract

We have developed methods to accurately determine the platinum isotope compositions of iron meteorites. These can be used to investigate processes of planetary formation and evolution, including accretion and core crystallisation.

A new double spike method for the determination of mass-dependent Te isotope compositions of meteorites and terrestrial materials by MC-ICP-MS

“…For samples that harbour such isotope anomalies, the issue can be addressed by carrying out additional analyses of the unspiked sample and application of this isotope data in the double spike data reduction. 13,20…”

“…In order to investigate the impact of potential mass-independent isotope effects on mass-dependent Te isotope compositions, the current study calculated the maximum mass-independent isotope anomalies that can be tolerated for a sample before this has a deleterious impact on the measured δ 130 Te values. 20…”

“…For samples that harbour such isotope anomalies, the issue can be addressed by carrying out additional analyses of the unspiked sample and application of this isotope data in the double spike data reduction. 13,20 In order to investigate the impact of potential massindependent isotope effects on mass-dependent Te isotope compositions, the current study calculated the maximum massindependent isotope anomalies that can be tolerated for a sample before this has a deleterious impact on the measured d 130 Te values. 20 Nucleosynthetic and radiogenic Te isotope anomalies and mass-independent Te isotope fractionations have yet to be unambiguously identied in natural samples.…”

“…13,20 In order to investigate the impact of potential massindependent isotope effects on mass-dependent Te isotope compositions, the current study calculated the maximum massindependent isotope anomalies that can be tolerated for a sample before this has a deleterious impact on the measured d 130 Te values. 20 Nucleosynthetic and radiogenic Te isotope anomalies and mass-independent Te isotope fractionations have yet to be unambiguously identied in natural samples. 2,3,18,[21][22][23] The following calculations therefore employed a theoretical sample, which was assigned nucleosynthetic anomalies on the 126 Te/ 125 Te, 128 Te/ 125 Te and 130 Te/ 125 Te ratios and that correspond to anomalies that would be expected for a small decit of isotopes produced by s-process nucleosynthesis.…”

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

“…Poole et al 182 devised new methods to determine Pt isotope compositions. The study was targeted at both mass-independent and mass-dependent isotope variations in iron meteorites.…”