Off‐Mount Calibration and One New Potential Pyrrhotite Reference Material for Sulfur Isotope Measurement by Secondary Ion Mass Spectrometry

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 δ 34 S values was negligible when secondary ion mass spectrometry ( SIMS ) analytical settings remained stable. In consequence, an off‐mount calibr...

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Bibliographic Details
Published in:Geostandards and Geoanalytical Research
Main Authors: Li, Rucao, Xia, Xiaoping, Yang, Shenghong, Chen, Huayong, Yang, Qing
Other Authors: National Key R & D Program of China, Guangzhou Municipal Government, Chinese National Basic Research 973-Program
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2018
Subjects:
Northern Finland
Online Access:http://dx.doi.org/10.1111/ggr.12244
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fggr.12244
https://onlinelibrary.wiley.com/doi/pdf/10.1111/ggr.12244
https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ggr.12244
Description
Summary: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 δ 34 S 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. YP 136 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 34 S/ 32 S was 0.3‰ (2 s , n = 318), which is the same as that of the well‐characterised pyrite reference materials PPP ‐1 and UWP y‐1. Its δ 34 S value determined by gas mass spectrometry was 1.5 ± 0.1‰ (2 s , n = 11), which agrees with the SIMS data (1.5 ± 0.3‰, 2 s ) calibrated by pyrrhotite reference material Po‐10. Therefore, YP 136 pyrrhotite is considered a candidate reference material for in situ sulfur isotope determination.

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