Startseite Effect of alkalinity on sulfur concentration at sulfide saturation in hydrous basaltic andesite to shoshonite melts at 1270 °C and 1 GPa
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Effect of alkalinity on sulfur concentration at sulfide saturation in hydrous basaltic andesite to shoshonite melts at 1270 °C and 1 GPa

  • Rameses J. D’Souza und Dante Canil EMAIL logo
Veröffentlicht/Copyright: 2. Juli 2018
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 103 Heft 7

Abstract

We have measured the effect of alkalis on S concentration at sulfide saturation (SCSS) in an underexplored compositional space of natural hydrous arc melts (basaltic andesite to shoshonite) at 1270 °C and 1 GPa. At an oxygen fugacity approximately 2.5 log units below the fayalite-magnetite-quartz (FMQ) buffer, SCSS increases with Na2O (562 ppm S/wt% Na2O), K2O (98 ppm S/wt% K2O), and total alkalis (88 ppm S/wt% Na2O+K2O) over the compositional range we have studied (1.6–3.1 wt% Na2O; 0–6.5 wt% K2O; 1.9–6.3 wt% FeOtot). Experiments with ~1.3 wt% H2O show approximately half the increase in SCSS with alkalinity compared to those with ~3.0 wt% H2O. Our results show a possible limit to the increase in SCSS solely by increasing alkali concentration at ~7.5 wt% total alkali concentration. Using our results and published data, we retrained earlier SCSS models to provide a better fit to test data. We also developed a new empirical model using theoretical optical basicity as a compositional parameter that predicts SCSS in the overall data set with slightly better accuracy compared to previous models:

In(SCSSppm)=16.34−5784T−339.4PT+10.85ln(Λ)+3.750XFeO+6.703XH2O

with temperature (T) in Kelvin, pressure (P) in GPa, the optical basicity (Λ) and mole fractions (X) of FeO (calculated from Kress and Carmichael 1991), and H2O in the melt. The discrepancies between observed and predicted SCSS for our experiments of varying alkalinity reflects the heavy bias toward anhydrous, alkali-poor basalt compositions in the underlying data sets on which most models are developed.

Keywords: Sulfur; alkalinity; melts; experiment; Planetary Processes as Revealed by Sulfides and Chalcophile Elements

2 Kuhn, M. Contributions from J. Wing, S. Weston, A. Williams, C. Keefer, A.Engelhardt, T. Cooper, Z. Mayer, B. Kenkel, the R Core Team, M. Benesty, R. Lescarbeau, A. Ziem, L. Scrucca, Y. Tang, C. Candan, and T. Hunt. (2017) caret: Classification and Regression Training. R package version 6.0-77. https://CRAN.R-project.org/package=caret

Acknowledgments

We thank M. Raudsepp (UBC), E. Czech (UBC), and A. Locock (UA) for assistance with EPMA, A. Brolo, A. Wlasenko, and S. Konorov for assistance with the Raman measurements, and L. Coogan for helpful discussions. We are also grateful to E. Cottrell for the use of her FTIR standard glasses in our Raman work. We acknowledge the reviews from P. Jugo and an anonymous reviewer and of J. Wykes on an earlier version of this manuscript. This work was supported by a National Sciences and Engineering Research Council of Canada Discovery Grant to D. Canil.

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Received: 2017-11-22
Accepted: 2018-03-28
Published Online: 2018-07-02
Published in Print: 2018-07-26

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.2138/am-2018-6404
Schlagwörter für diesen Artikel
Sulfur; alkalinity; melts; experiment; Planetary Processes as Revealed by Sulfides and Chalcophile Elements

Artikel in diesem Heft

  1. Highlights and Breakthroughs
  2. Biosilica: Structure, function, science, technology, and inspiration
  4. Gypsum, bassanite, and anhydrite at Gale crater, Mars
  6. Redox-induced nucleation and growth of goethite on synthetic hematite nanoparticles
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  10. Is fibrous ferrierite a potential health hazard? Characterization and comparison with fibrous erionite
  12. Experimental investigation of basalt and peridotite oxybarometers: Implications for spinel thermodynamic models and Fe3+ compatibility during generation of upper mantle melts
  14. Pressure, sulfur, and metal-silicate partitioning: The effect of sulfur species on the parameterization of experimental results
  16. Analysis and visualization of vanadium mineral diversity and distribution
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  22. AMFORM, a new mass-based model for the calculation of the unit formula of amphiboles from electron microprobe analyses
  24. Fe-kaolinite in granite saprolite beneath sedimentary kaolin deposits: A mode of Fe substitution for Al in kaolinite
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  32. Heat capacity measurements of CaAlSiO4F from 5 to 850 K and its standard entropy
  33. Letter
  34. Trace element thermometry of garnet-clinopyroxene pairs, revisited
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Heruntergeladen am 13.10.2025 von https://www.degruyterbrill.com/document/doi/10.2138/am-2018-6404/html?lang=de
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