Journal
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
Volume 43, Issue 1, Pages 177-187Publisher
WILEY
DOI: 10.1111/ggr.12244
Keywords
off-mount calibration; secondary ion mass spectrometry; pyrrhotite; reference material; sulfur isotopes
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Funding
- Guangzhou municipal government [201607020029]
- Chinese National Basic Research 973-Program [2014CB440802]
- National Key R&D Program of China [2016YFC0600407]
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Sulfur isotope measurements in three sulfide (two pyrite and one pyrrhotite) samples on two epoxy mounts showed that the mount-to-mount variation of raw delta S-34 values was negligible when secondary ion mass spectrometry (SIMS) analytical settings remained stable. In consequence, an off-mount calibration procedure for SIMS sulfur isotope analysis was applied in this study. YP136 is a pyrrhotite sample collected from northern Finland. Examination of thin sections with a polarising microscope, backscattered electron image analyses and wavelength dispersive spectrometry mapping showed that the sample grains display no internal growth or other zoning. A total of 318 sulfur isotope (spot) measurements conducted on more than 100 randomly selected grains yielded highly consistent sulfur isotope ratios. The repeatability of all the analytical results of S-34/S-32 was 0.3 parts per thousand (2s, n = 318), which is the same as that of the well-characterised pyrite reference materials PPP-1 and UWPy-1. Its delta S-34 value determined by gas mass spectrometry was 1.5 +/- 0.1 parts per thousand (2s, n = 11), which agrees with the SIMS data (1.5 +/- 0.3 parts per thousand, 2s) calibrated by pyrrhotite reference material Po-10. Therefore, YP136 pyrrhotite is considered a candidate reference material for in situ sulfur isotope determination.
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