Jump to main content
Jump to site search


Simultaneous determinations of Sulfur Isotopes and Trace Elements in Pyrite with NanoSIMS 50L

Abstract

Pyrite is a common sulfide mineral involved in formation of various ores and hydrothermal and biogenetic activities, and its S isotopic ratios and trace element contents and their spatial distribution have recorded the processes of these events. We established simultaneous analyses of 34S/32S ratios and trace element contents of pyrite using nanometer-scale secondary ion mass spectrometry (NanoSIMS). Firstly, the images of S (34S-), As (75As-), Se (80Se-), Cu (63Cu32S-), Au (197Au-) and Pb (208Pb32S-) of pyrite were acquired by rastering areas ranging from 20×20 μm2 to 40×40 μm2 using an Cs+ beam of 7–10 pA with a diameter of ~250 nm. Then, the 34S/32S ratios (32S- by Faraday cup and 34S- by electron multiplier) and the concentrations of these trace elements of the individual layers of the zoned pyrite grains were simultaneously measured in spot analysis mode, by rastering the same current over an area of 2x2 μm2. The 34S/32S ratios were calibrated for matrix effect with pyrite standard Balmat or Py1117, and the external reproducibility (1SD) is <0.5‰. The concentrations of trace elements were calibrated using the relative sensitivity factors (RSFs) of As, Se, Cu, Au and Pb, which were determined from pyrite grains with zoning layers. The determined RSFs of As, CuS, Au and PbS are 4.43±0.28, 0.36±0.04, 0.18±0.03 and 38.0±15.1, respectively. Pyrite from Lannigou Carlin type gold deposit was analyzed as example, and the results revealed three main episodes of its formation, with each superposed by micron-width oscillation zonings of trace elements. This method has important potential applications in isotopic and elemental investigation of thin layers of pyrite and other sulfides.

Back to tab navigation

Supplementary files

Publication details

The article was received on 09 Jun 2017, accepted on 27 Oct 2017 and first published on 30 Oct 2017


Article type: Paper
DOI: 10.1039/C7AY01440F
Citation: Anal. Methods, 2017, Accepted Manuscript
  •   Request permissions

    Simultaneous determinations of Sulfur Isotopes and Trace Elements in Pyrite with NanoSIMS 50L

    J. Zhang, Y. Lin, J. Yan, J. Li and W. Yang, Anal. Methods, 2017, Accepted Manuscript , DOI: 10.1039/C7AY01440F

Search articles by author

Spotlight

Advertisements