Secondary Ion Mass Spectrometry Bias on Isotope Ratios in Dolomite-Ankerite, Part II: δ13C Matrix Effects
- Univ. of Wisconsin, Madison, WI (United States); UW-Madison
- Univ. of Wisconsin, Madison, WI (United States)
- Univ. of Wisconsin, Madison, WI (United States); State Univ. of New Jersey, New Brunswick, NJ (United States)
Here, this study is Part II of a series that documents the development of a suite of calibration reference materials for in situ SIMS analysis of stable isotope ratios in Ca-Mg-Fe carbonates. Part I explored the effects of Fe2+ substitution on SIMS δ18O bias measured from the dolomite–ankerite solid solution series [CaMg(CO3)2–CaFe(CO3)2], whereas this complementary work explores the compositional dependence of SIMS δ13C bias (calibrated range: Fe# = 0.004–0.789, where Fe# = molar Fe/(Mg+Fe)). Under routine operating conditions for carbonate δ13C analysis at WiscSIMS (CAMECA IMS 1280), the magnitude of instrumental bias increased exponentially by 2.5–5.5‰ (session-specific) with increasing Fe-content in the dolomite structure, but appeared insensitive to minor Mn substitution [< 2.6 mole % Mn/(Ca+Mg+Fe+Mn)]. The compositional dependence of bias (i.e., the matrix effect) was expressed using the Hill equation, yielding calibration residual values ≤ 0.3‰ relative to CRM NBS-19 for eleven carbonate reference materials (6-μm-diameter spot size measurements). Based on the spot-to-spot repeatability of a drift monitor material that ‘bracketed’ each set of ten sample-spot analyses, the analytical precision was ± 0.6–1.2‰ (2s, standard deviations). The analytical uncertainty for individual sample analyses was approximated by combining the precision and calibration residual values (propagated in quadrature), suggesting an uncertainty of ± 1.0–1.5‰ (2s).
- Research Organization:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)
- Grant/Contract Number:
- FG02-93ER14389
- OSTI ID:
- 1666244
- Journal Information:
- Geostandards and Geoanalytical Research, Journal Name: Geostandards and Geoanalytical Research Journal Issue: 2 Vol. 40; ISSN 1639-4488
- Publisher:
- Wiley - International Association of GeoanalystsCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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