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Simultaneous measurement of sulfide Re–Os and S isotopic compositions using a Carius tube digestion-based N–TIMS and MC–ICP–MS approach

Abstract

This study reports an improved procedure for the simultaneous determination of the Re–Os and S isotopic compositions of sulfur-bearing minerals using negative thermal ionization mass spectrometry (N–TIMS) and multicollector–inductively coupled plasma–mass spectrometry (MC–ICP–MS), respectively. This approach uses a Carius tube digestion technique combined with inverse aqua regia to avoid the incomplete decomposition of sulfide minerals and the partial loss of S and Os during acid digestion. The sequential separation and purification of S and Re from sample matrix elements is undertaken after Os separation by CCl4 "end Subscript" solvent extraction and utilizes a two-stage tandem column setup using cation and anion exchange resins. Sulfur is not absorbed into either of the cation or anion exchange resin columns and can be directly eluted using 0.1 mol/L HNO3 "end Subscript", whereas Re is absorbed onto the anion exchange resin column. This approach allowed the quantitative recovery of S (99.8%) and Re (99.7%), and the efficient removal of matrix elements from the final purified sample. The δ 34S values of IAEA S-2, S-3, and IAPSO seawater standards determined during this study (calibrated using the IAEA S-1 standard) are consistent with certified values and are of higher precision than values obtained using conventional analytical techniques. Our approach can also be used with different kinds of sulfide minerals. This combined Re–Os–S isotopic analysis provides useful information on the timing of ore deposit formation and constrains the source of ore-forming fluid material. This approach also allows the determination of the Re–Os and S isotopic compositions of single sample digestion, thereby avoiding problems with sample heterogeneity that can arise when comparing S and Re–Os isotopic data generated by conventional approaches.

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Publication details

The article was received on 16 Jan 2018, accepted on 26 Apr 2018 and first published on 27 Apr 2018


Article type: Paper
DOI: 10.1039/C8JA00014J
Citation: J. Anal. At. Spectrom., 2018, Accepted Manuscript
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    Simultaneous measurement of sulfide Re–Os and S isotopic compositions using a Carius tube digestion-based N–TIMS and MC–ICP–MS approach

    S. Sun, J. Li, L. Zhang, L. Yin and J. Zhang, J. Anal. At. Spectrom., 2018, Accepted Manuscript , DOI: 10.1039/C8JA00014J

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