Issue 9, 2024

A potential natural chalcopyrite reference material for in situ copper, iron, and sulfur isotope measurements

Abstract

Chalcopyrite has been extensively utilized for tracing geological processes through its Cu, Fe and S isotopic compositions. However, the matrix-matched reference materials for micro-analysis are lacking. This study focused on assessing the feasibility of a natural chalcopyrite specimen (IGGCcp-1) as a matrix-matched reference material for in situ micro-analysis of Cu, Fe, and S isotopes. Electron probe microanalysis validated the uniform distribution of major elements within chalcopyrite grains, with no evidence of growth zoning. Random spot isotopic measurements using LA-MC-ICP-MS demonstrated remarkable consistency in δ65Cu, δ56Fe and δ34S. These results indicated that the IGGCcp-1 specimen exhibited its suitability as a reference material. Using SN-MC-ICP-MS technique, the δ65Cu value was accurately determined to be 0.43 ± 0.05‰ (2S, N = 30). Furthermore, the δ56FeIRMM-014 and δ57FeIRMM-014 values were recorded as −0.24 ± 0.04‰ (2S, N = 18) and −0.36 ± 0.09‰ (2S, N = 18), respectively. Additionally, the δ34SVCDT measurement, performed with EA-IRMS, yielded a value of −0.28 ± 0.60‰ (2S, N = 10). These precisely measured isotope ratios established the recommended reference values for the IGGCcp-1 sample in future applications of Cu, Fe, and S isotope micro-analysis.

Graphical abstract: A potential natural chalcopyrite reference material for in situ copper, iron, and sulfur isotope measurements

Supplementary files

Article information

Article type
Paper
Submitted
18 Apr 2024
Accepted
09 Jul 2024
First published
12 Jul 2024

J. Anal. At. Spectrom., 2024,39, 2207-2219

A potential natural chalcopyrite reference material for in situ copper, iron, and sulfur isotope measurements

L. Xie, H. Fan, H. Yu, C. Huang, L. Xu, Y. Yang, S. Wu and H. Wang, J. Anal. At. Spectrom., 2024, 39, 2207 DOI: 10.1039/D4JA00147H

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