| Institution: | 1. Isotope Laboratory, Department of Earth and Space Sciences, University of Washington, Seattle, WA, USA;2. Isotope Laboratory, Department of Geosciences, University of Arkansas, Fayetteville, AR, USA;3. CAS Key Laboratory of Crust‐Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China;4. State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing, China;5. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;6. School of Earth and Space Sciences, Peking University, Beijing, China;7. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China;8. Department of Geology, University of Maryland, College Park, MD, USA;9. Origins Laboratory, Department of the Geophysical Sciences, The University of Chicago, Chicago, IL, USA;10. Department of Earth Sciences, University of Hong Kong, Hong Kong, China |
| Abstract: | 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 δ26Mg and ≤ 0.05‰ (2s) for δ25Mg. 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. |
