This analysis reports new spinel materials for oxygen isotopic measurements, suggesting improved standards for geochemical studies.
Three natural spinels—MadSP (Mg₀. 75 Fe₀. 25 Al 2 O 4 ), TanzSP-1, and TanzSP-2 (both MgAl 2 O 4 )—are reported as SIMS oxygen isotope reference materials. Their recommended δ 18 O values are 11.94 ± 0.43‰, 23.40 ± 0.20‰, and 13.29 ± 0.48‰, respectively.
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Li et al. (2026) studied this question.
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