New Potential Sphalerite, Chalcopyrite, Galena and Pyrite Reference Materials for Sulfur Isotope Determination by Laser Ablation‐MC‐ICP‐MS

The sulfur isotope system is important in tracing a variety of geochemical processes. However, the availability of matrix‐matched reference materials for in situ sulfur isotope ratio measurement is limited. This study analysed four sulfide specimens to investigate their potential as reference materi...

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Published in:Geostandards and geoanalytical research 2022-09, Vol.46 (3), p.451-463
Main Authors: Lv, Nan, Bao, Zhian, Chen, Kaiyun, Zong, Chunlei, Zhang, Yan, Yuan, Honglin
Format: Article
Language:English
Subjects:
Ablation
Canyons
GC‐1
in situ measurement
Isotopes
Lasers
Mass spectrometry
Mass spectroscopy
matrix‐matched reference material
NWU‐GN
Pyrite
Reference materials
RPPY
S isotopes
Scientific imaging
SPH‐1
Sulfides
Sulfur
Sulfur isotopes
Sulphides
Sulphur
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Summary:The sulfur isotope system is important in tracing a variety of geochemical processes. However, the availability of matrix‐matched reference materials for in situ sulfur isotope ratio measurement is limited. This study analysed four sulfide specimens to investigate their potential as reference materials for in situ sulfur isotope determination, including three natural sulfide minerals (sphalerite SPH‐1, chalcopyrite GC‐1 and galena NWU‐GN), and one resin preserved pyrite powder (RPPY). These four sulfides were analysed independently in four laboratories using both bulk and microbeam analysis techniques, all of which gave equivalent results within uncertainty with comparable accuracy and precision. The sulfur isotopes of these four sulfides are homogeneous based on a large number of isotope determinations by solution nebulisation multi‐collector inductively coupled plasma‐mass spectrometry (MC‐ICP‐MS) and laser ablation (LA) MC‐ICP‐MS. The mean δ34S values for SPH‐1, RPPY, GC‐1 and NWU‐GN determined by gas source isotope ratio mass spectrometry (GS‐IRMS) and solution nebulisation MC‐ICP‐MS are −7.13 ± 0.41‰ (2s), 3.66 ± 0.24‰ (2s), −0.65 ± 0.28‰ (2s), 28.21 ± 0.17‰ (2s) relative to the Vienna‐Canyon Diablo troilite (V‐CDT) reference value, respectively, and which are proposed as potential preferred values. Over 400 spot analyses performed on randomly selected fragments of each sulfide by LA‐MC‐ICP‐MS yielded highly consistent δ34S values with the preferred values. Thus, SPH‐1, GC‐1, NWU‐GN and RPPY are considered a set of candidate matrix‐matched sulfide reference materials for in situ sulfur isotope determination. Key Points Four sulfide minerals are proposed as potential reference materials for in situ sulfur isotope measurement. The sulfur isotopic composition of these reference materials is homogeneous based on a large number of isotope determinations in different laboratories. Reference values of δ34S are provided for the sulfide materials.
ISSN:1639-4488
1751-908X
DOI:10.1111/ggr.12440