Startseite Measuring H2O concentrations in olivine by secondary ion mass spectrometry: Challenges and paths forward
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Measuring H2O concentrations in olivine by secondary ion mass spectrometry: Challenges and paths forward

  • W. Henry Towbin ORCID logo , Terry Plank , Emily Klein und Erik Hauri
Veröffentlicht/Copyright: 9. Mai 2023
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 108 Heft 5

Abstract

Trace concentrations of H2O in olivine strongly affect diverse mantle and magmatic processes. H2O in olivine has been difficult to accurately quantify due to challenges in sample preparation and measurement, as well as significant uncertainties in standard calibrations. Here we directly compare secondary-ion mass spectrometry (SIMS) measurements of the olivine standards of Bell et al. (2003, hereafter Bell03) and Withers et al. (2012, hereafter Withers12) upon which most SIMS and Fourier transform infrared (FTIR) spectroscopy analyses are based. In the same SIMS session, we find that the olivine standards from the two studies are offset by ~50%, forming lines of different slope when comparing SIMS measurements to the independent nuclear reaction analysis (NRA) in Bell03 and elastic recoil detection analysis (ERDA) in Withers12. This offset is similar to the ~40% offset that exists in the FTIR absorption coefficients determined by those two studies, and points to the NRAERDA data as the cause for the offset more than different IR absorption characteristics of the different olivines. We find that the Withers12 olivine standards form the most precise calibration line, and that the measured Bell03 olivine standards have issues of reproducibility and accuracy due to the presence of hydrous inclusions (as documented previously by Mosenfelder et al. 2011). Owing to the limited availability of the Withers12 olivine standards, however, we recommend using orthopyroxene standards (Kumamoto et al. 2017) to calibrate H2O in olivine by SIMS due to similar calibration slopes. We revise the reference values of current orthopyroxene standards to account for uncertainties in the Bell et al. (1995) manometry data. With these revised values, the orthopyroxene calibration line is within 12% of the Withers12 olivine line, which is within the long-term uncertainty of the SIMS olivine measurements. We apply our SIMS calibration protocol to revise estimates of the partition coefficients for H2O between olivine and melt, resulting in a value of 0.0009 ± 0.0003 at pressures ~0.2–2 GPa. This brings into closer agreement between the partition coefficients determined from experimental studies and those based on natural studies of olivine-hosted melt inclusions.

Keywords: SIMS; water; olivine; nominally anhydrous minerals; calibration; volatiles; standards

* Present address: Gemological Institute of America, 50 W 47th St. 8th floor, New York, NY 10036, U.S.A.

† Deceased September 5, 2018.

Acknowledgments and Funding

Dr. Erik Hauri collected the new data presented here and performed preliminary data reductions, but did not participate in the writing of this manuscript prior to his passing. Our analysis was guided by our personal communications with him in January of 2018. We are indebted to Anthony Withers who provided to E.H.H. his synthetic olivines. We thank Elizabeth Ferriss and Samer Naif for their work developing and organizing the 2016 Workshop on the Electrical Conductivity of olivine hosted at the Carnegie Institution of Washington with support from the Cooperative Institute for Dynamic Earth Research. That workshop led to the acquisition of the SIMS calibrations studied here. We are grateful for the help and ingenuity of Jianhua Wang while collecting SIMS data at Carnegie over the course of many analytical sessions. We thank Anna Barth and Megan Newcombe for their insights into this subject matter. We are grateful to Rick Hervig, Peter Tollan, and Jed Mosenfelder for their thorough reviews and Anne Peslier for her keen insights and essential guidance as Associate Editor. This work was supported by the National Science Foundation under grant no. EAR-1731784 to T.P. and grant no. DGE 2036197 to W.H.T. under the NSF’s Graduate Research Fellowship Program.

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Received: 2021-08-11
Accepted: 2022-06-17
Published Online: 2023-05-09
Published in Print: 2023-05-25

© 2023 by Mineralogical Society of America

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https://doi.org/10.2138/am-2022-8247
Schlagwörter für diesen Artikel
SIMS; water; olivine; nominally anhydrous minerals; calibration; volatiles; standards

Artikel in diesem Heft

  1. Eu speciation in apatite at 1 bar: An experimental study of valence-state partitioning by XANES, lattice strain, and Eu/Eu* in basaltic systems
  2. The effect of composition on chlorine solubility and behavior in silicate melts
  3. High-temperature phase relations of hydrous aluminosilicates at 22 GPa in the AlOOH-AlSiO3OH system
  4. Crystallization of spinel from coexisting silicate and sulfide immiscible liquids: An equilibrium case with postcumulus reactions
  5. X-ray absorption spectroscopy study of Mn reference compounds for Mn speciation in terrestrial surface environments
  6. Heterogeneous and retarded phase transformation of ferrihydrite on montmorillonite surface: The important role of surface interactions
  7. Atomic-scale characterization of the oxidation state of Ti in meteoritic hibonite: Implications for early solar system thermodynamics
  8. Structural behavior of C2/m tremolite to 40 GPa: A high-pressure single-crystal X-ray diffraction study
  9. Optimizing Raman spectral collection for quartz and zircon crystals for elastic thermobarometry
  10. Measuring H2O concentrations in olivine by secondary ion mass spectrometry: Challenges and paths forward
  11. Arsenic clustering in arsenian pyrite: A combined photoemission and theoretical modeling study
  12. High-pressure electrical conductivity and elasticity of iron-bearing δ-AlOOH
  13. Nudged elastic band calculations of the (4H)XSi hydrogarnet type defect in Mg2SiO4 forsterite
  14. Mn substitution and distribution in goethite and influences on its photocatalytic properties: A combined study using first-principles calculations and photocatalytic experiments
  15. Incorporating previously neglected excess oxygen associated with ferric iron in matrix corrections of microprobe data from cubic and rhombohedral Fe-Ti oxides
  16. Recycled carbonates in the mantle sources of natural kamafugites: A zinc isotope perspective
  17. Raman analysis of octocoral carbonate ion structural disorder along a natural depth gradient, Kona coast, Hawai‘i
  18. Memorial of Charles Wilson Burnham, 1933–2021
  19. Erratum
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