Journal
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
Volume 37, Issue 1, Pages 19-33Publisher
WILEY
DOI: 10.1111/j.1751-908X.2012.00188.x
Keywords
secondary ion mass spectrometry; multicollection; reference materials; mass-independent fractionation; sulfides
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High spatial resolution multiple sulfur isotope studies undertaken by multi-collector secondary ion mass spectrometry (SIMS) commonly use well-characterised sulfide reference materials that do not (or are assumed not to) exhibit mass-independent fractionation in S-33 and S-36, taking advantage of the three-isotope plot to evaluate the extent of such fractionation in unknown targets. As a result, few studies to date have used a mass independently fractionated reference sulfide to demonstrate accuracy of measurement and/or data reduction procedures. This article evaluates two mass independently fractionated sulfides, a pyrite from the 3.7 Ga Isua greenstone belt and a pyrrhotite from a 2.7 Ga gold deposit in Minas Gerais, Brazil, which may be used to provide additional confidence in the obtained multiple sulfur isotope data. Additionally, the article presents a method for measuring quadruple sulfur isotopes by SIMS at a comparable spatial and volume resolution to that typically employed for triple sulfur isotopes. This method has been applied to the Isua pyrite as well as to a sample of 2.5 Ga pyrite from the Campbellrand, Transvaal, South Africa, previously investigated using SIMS for triple sulfur isotopes, illustrating its potential for quadruple sulfur investigations.
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