Journal
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
Volume 39, Issue 3, Pages 329-339Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1751-908X.2014.00326.x
Keywords
magnesium; isotope; MC-ICP-MS; sediments; silicate reference materials; stable isotopes
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Funding
- National Science Foundation [EAR-0838227, EAR-1056713, EAR-1340160]
- University of Washington Mary Gates Research Scholarship
- Division Of Earth Sciences
- Directorate For Geosciences [1340160] Funding Source: National Science Foundation
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Magnesium isotopic compositions are reported for twenty-four international geological reference materials including igneous, metamorphic and sedimentary rocks, as well as phlogopite and serpentine minerals. The long-term reproducibility of Mg isotopic determination, based on 4-year analyses of olivine and seawater samples, was 0.07 (2s) for Mg-26 and 0.05 parts per thousand (2s) for Mg-25. Accuracy was tested by analysis of synthetic reference materials down to the quoted long-term reproducibility. This comprehensive dataset, plus seawater data produced in the same laboratory, serves as a reference for quality assurance and inter-laboratory comparison of high-precision Mg isotopic data. Les compositions isotopiques du magnesium sont fournies pour vingt-quatre materiaux geologiques de reference internationaux, comprenant des roches ignees, metamorphiques et sedimentaires, ainsi qu'une phlogopite et des serpentines. La reproductibilite a long terme de la determination isotopique du Mg, basee des analyses sur quatre ans d'echantillons d'olivine et d'eau de mer, etait 0.07% (2s) pour Mg-26 et 0.05% (2s) pour Mg-25. La precision a ete testee par l'analyse de materiaux de reference synthetiques jusqu'a la reproductibilite a long terme indiquee. Cette base de donnees complete, ainsi que des donnees d'eau de mer produites dans le meme laboratoire, servent de reference pour l'assurance qualite et la comparaison inter-laboratoires de haute precision des donnees isotopiques du Mg.
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