Re-examining deep time sulfur isotope records from a micro-scale perspective

Paiste, Kärt; Mayika, Karen Bakakas; Fike, David A.; Kirsimäe, Kalle; Moussavou, Mathieu; Wood, R.; Anderton, Christopher R.; Prave, Anthony R.; Lepland, Aivo

doi:10.46427/gold2022.11172

Goldschmidt2022 Abstracts 2022

DOI: 10.46427/gold2022.11172

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Re-examining deep time sulfur isotope records from a micro-scale perspective

Kärt Paiste¹,

Karen Bakakas Mayika²,

David A. Fike³

et al.

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2023

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“…Sulfur (S), iron (Fe) and copper (Cu) are ubiquitous elements with different oxidation states that are heterogeneously distributed throughout reservoirs (Sawaki et al 2018, Paiste et al 2022, Smith et al 2022, McLoughlin et al 2023. The S-Fe-Cu isotope systems in sulfides have been well proven to be excellent geochemical tracers in diverse fields of geoscience, such as research on planetary evolution events, mineralisation mechanisms, hydrothermal activity and bioenvironmental processes (Li et al 2010, Marin-Carbonne et al 2014, Mount et al 2022, Hiebert et al 2016, Brzozowski et al 2021, Yu et al 2021, Lehmann et al 2022, Zhao et al 2022.…”

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New Potential Sulfide Reference Materials for Microbeam S‐Fe‐Cu Isotope Measurements

Feng,

Zhang,

et al. 2023

Geostandard Geoanalytic Res

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S‐Fe‐Cu isotope systems are powerful tracers for revealing geochemical processes. However, the microanalysis of S‐Fe‐Cu isotopes is critically limited by the lack of suitable reference materials. Herein, we present three potential reference materials Ll‐Cpy (chalcopyrite), Ll‐Po (pyrrhotite) and Ll‐Sp (sphalerite) for in situ S‐Fe‐Cu isotope measurements. Numerous in situ S‐Fe‐Cu isotope measurements were performed over two years to assess isotopic homogeneity. The bulk S isotopic compositions were determined independently in seven laboratories by isotope ratio mass spectrometry (IRMS); the preferred δ34SV‐CDT for Ll‐Cpy, Ll‐Po, Ll‐Sp are 6.13 ± 0.37‰ (2s), 6.42 ± 0.37‰ (2s) and 6.28 ± 0.38‰ (2s), respectively. The bulk Fe isotope ratios in Fe‐bearing Ll‐Cpy and Ll‐Po were determined using solution nebulisation multi‐collector inductively coupled plasma‐mass spectrometry, and the obtained δ56FeIRMM‐014 values are 0.57 ± 0.07‰ (2s) and ‐0.62 ± 0.07‰ (2s), respectively. The mean bulk δ65CuNIST SRM 976 value of Ll‐Cpy is 0.57 ± 0.06‰ (2s). All the bulk values are in good agreement with the long‐term statistical results of laser ablation‐MC‐ICP‐MS and proposed as the recommended values. These sulfides are well characterised and isotopically homogeneous (at 30–40 μm spatial resolution), and can be used as potential calibration materials for in situ S‐Fe‐Cu isotope measurements.

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mentioning

confidence: 99%

New Potential Sulfide Reference Materials for Microbeam S‐Fe‐Cu Isotope Measurements

Feng,

Zhang,

et al. 2023

Geostandard Geoanalytic Res

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Re-examining deep time sulfur isotope records from a micro-scale perspective

Cited by 1 publication

References 0 publications

New Potential Sulfide Reference Materials for Microbeam S‐Fe‐Cu Isotope Measurements

New Potential Sulfide Reference Materials for Microbeam S‐Fe‐Cu Isotope Measurements

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