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

Publication ,  Journal Article
Henry Towbin, W; Plank, T; Klein, E; Hauri, E
Published in: American Mineralogist
May 1, 2023

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.

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Published In

American Mineralogist

DOI

EISSN

1945-3027

ISSN

0003-004X

Publication Date

May 1, 2023

Volume

108

Issue

5

Start / End Page

928 / 940

Related Subject Headings

  • Geochemistry & Geophysics
  • 0914 Resources Engineering and Extractive Metallurgy
  • 0403 Geology
  • 0402 Geochemistry
 

Citation

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Henry Towbin, W., Plank, T., Klein, E., & Hauri, E. (2023). Measuring H2O concentrations in olivine by secondary ion mass spectrometry: Challenges and paths forward. American Mineralogist, 108(5), 928–940. https://doi.org/10.2138/am-2022-8247
Henry Towbin, W., T. Plank, E. Klein, and E. Hauri. “Measuring H2O concentrations in olivine by secondary ion mass spectrometry: Challenges and paths forward.” American Mineralogist 108, no. 5 (May 1, 2023): 928–40. https://doi.org/10.2138/am-2022-8247.
Henry Towbin W, Plank T, Klein E, Hauri E. Measuring H2O concentrations in olivine by secondary ion mass spectrometry: Challenges and paths forward. American Mineralogist. 2023 May 1;108(5):928–40.
Henry Towbin, W., et al. “Measuring H2O concentrations in olivine by secondary ion mass spectrometry: Challenges and paths forward.” American Mineralogist, vol. 108, no. 5, May 2023, pp. 928–40. Scopus, doi:10.2138/am-2022-8247.
Henry Towbin W, Plank T, Klein E, Hauri E. Measuring H2O concentrations in olivine by secondary ion mass spectrometry: Challenges and paths forward. American Mineralogist. 2023 May 1;108(5):928–940.
Journal cover image

Published In

American Mineralogist

DOI

EISSN

1945-3027

ISSN

0003-004X

Publication Date

May 1, 2023

Volume

108

Issue

5

Start / End Page

928 / 940

Related Subject Headings

  • Geochemistry & Geophysics
  • 0914 Resources Engineering and Extractive Metallurgy
  • 0403 Geology
  • 0402 Geochemistry