Startseite Electrical properties of iron sulfide-bearing dunite under pressure: Effect of temperature, composition, and annealing time
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Electrical properties of iron sulfide-bearing dunite under pressure: Effect of temperature, composition, and annealing time

  • Michael J. Tauber ORCID logo , Suryansh Saxena , Emma S. Bullock , Hélène Ginestet und Anne Pommier
Veröffentlicht/Copyright: 30. November 2023
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 108 Heft 12

Abstract

The detection and quantification of metal sulfides in host rocks by electrical measurements have been priorities for field and laboratory studies, motivated by mineral prospecting and fundamental interest in the mantle structure or core/mantle differentiation, among other reasons. Here, we reanalyze electrical data for a dunite host with added FeS or Fe-S-Ni (Saxena et al. 2021), and report additional experimental runs along with electron microprobe analyses. The applied pressure was 2 GPa; impedance spectra were acquired while annealing at 1023 K (below the metal-sulfide solidus), and while varying temperature from 570 to 1650 K. Addition of 6.5 or 18 vol% FeS strongly enhances conductivity of the bulk sample compared with that of the dunite host, though values are 100–100 000 times less than those of pure FeS. These results indicate that most metal sulfide content is not part of a viable conductive path, even for the 18 vol% quantity. Nevertheless, the relatively high conductivity and weak temperature dependence of the 18 vol% sample reveal that contiguous paths of solid or molten FeS span the electrodes. The sample with 6.5 vol% sulfide also exceeds the percolation threshold for temperatures as low as ~100 K below the eutectic melting point, likely because FeS softens. Conductivity is nearly unchanged upon crossing the eutectic temperature, however a decline over 1400–1500 K reveals that the 6.5 vol% molten FeS forms a fragile electrical network in dunite. Samples with Fe50S40Ni10 or Fe40S40Ni20 (at%) are less conductive than pure dunite at temperatures below ~1450 K. This surprising result, likely caused by a reducing influence of Fe or Ni metal, does not support the use of FeS as an analog for compositions with nickel or excess metal. Our findings suggest that probing the electrical network of metal sulfides as solids complements other studies focused on connectivity of molten metal sulfides.

Keywords: Impedance spectroscopy; electrical conductivity; metal sulfide; xenolith; percolation threshold

Acknowledgments and funding

The authors are grateful to Carnegie-EPL librarians M.A. O’Donnell and Shaun Hardy for their assistance. We thank G. Solferino for an extensive review, as well as L. Dai and three anonymous reviewers for their helpful feedback. A.P. acknowledges support from NSF-CAREER award EAR-1750746 and NSF-NERC grant 1832462. Use of the COMPRES Cell Assembly Project was supported by COMPRES under NSF Cooperative Agreement EAR 1661511. The electrical cell used in these experiments is available via COMPRES.

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Received: 2023-05-07
Accepted: 2023-08-24
Published Online: 2023-11-30
Published in Print: 2023-12-15

© 2023 by Mineralogical Society of America

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  12. In-situ study of microstructures induced by the olivine to wadsleyite transformation at conditions of the 410 km depth discontinuity
  13. Effect of pre-existing crystals and melt homogeneity on the decompression-induced crystallization of hydrous rhyodacite magma
  14. Origin of clinopyroxene-ilmenite symplectites in mafic granulites from eastern parts of the Chotanagpur granite gneissic complex, East Indian shield
  15. Single-crystal analysis of La-doped pyromorphite [Pb5(PO4)3Cl]
  16. Crystal structure of calcium-ferrite type NaAlSiO4 up to 45 GPa
  17. Revision of the CaMgSi2O6-CO2 P-T phase diagram at 3–6 GPa
https://doi.org/10.2138/am-2022-9054
Schlagwörter für diesen Artikel
Impedance spectroscopy; electrical conductivity; metal sulfide; xenolith; percolation threshold

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  10. Efect of faceting on olivine wetting properties
  11. The obscuring efect of magma recharge on the connection of volcanic-plutonic rocks
  12. In-situ study of microstructures induced by the olivine to wadsleyite transformation at conditions of the 410 km depth discontinuity
  13. Effect of pre-existing crystals and melt homogeneity on the decompression-induced crystallization of hydrous rhyodacite magma
  14. Origin of clinopyroxene-ilmenite symplectites in mafic granulites from eastern parts of the Chotanagpur granite gneissic complex, East Indian shield
  15. Single-crystal analysis of La-doped pyromorphite [Pb5(PO4)3Cl]
  16. Crystal structure of calcium-ferrite type NaAlSiO4 up to 45 GPa
  17. Revision of the CaMgSi2O6-CO2 P-T phase diagram at 3–6 GPa
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