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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu


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Volume 103, Issue 8

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Accurate predictions of microscale oxygen barometry in basaltic glasses using V K-edge X-ray absorption spectroscopy: A multivariate approach

Antonio Lanzirotti / M. Darby Dyar
  • Department of Astronomy, Mount Holyoke College, South Hadley, Massachusetts 01075, U.S.A.
  • Planetary Science Institute, 1700 E. Fort Lowell, Tucson, Arizona 85719, U.S.A.
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/ Stephen Sutton
  • Center for Advanced Radiation Sources, The University of Chicago, Argonne, Illinois 60439, U.S.A.
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/ Matthew Newville
  • Center for Advanced Radiation Sources, The University of Chicago, Argonne, Illinois 60439, U.S.A.
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/ Elisabet Head
  • Department of Earth Science, Northeastern Illinois University, Chicago, Illinois 60625, U.S.A.
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/ CJ Carey
  • College of Information and Computer Sciences, University of Massachusetts, Amherst, Massachusetts 01003, U.S.A.
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/ Molly McCanta
  • Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee 37996, U.S.A.
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/ Lopaka Lee
  • U.S. Geological Survey, Hawaii Volcano Observatory, MS964, Hawaii National Park, Hawaii, 96718, U.S.A.
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/ Penelope L. King
  • Research School of Earth Sciences, Australian National University, Canberra, ACT 2601, Australia
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/ John Jones
Published Online: 2018-07-30 | DOI: https://doi.org/10.2138/am-2018-6319

Abstract

Because magmatic oxygen fugacity (fO2) exerts a primary control on the discrete vanadium (V) valence states that will exist in quenched melts, V valence proxies for fO2, measured using X-ray absorption near-edge spectroscopy (XANES), can provide highly sensitive measurements of the redox conditions in basaltic melts. However, published calibrations for basaltic glasses primarily relate measured intensities of specific spectral features to V valence or oxygen fugacity. These models have not exploited information contained within the entire XANES spectrum, which also provide a measure of changes in V chemical state as a function of fO2. Multivariate analysis (MVA) holds significant promise for the development of calibration models that employ the full XANES spectral range. In this study, new calibration models are developed using MVA partial least-squares (PLS) regression and least absolute shrinkage and selection operator (Lasso) regression to predict the fO2 of equilibration in glasses of basaltic composition directly. The models are then tested on a suite of natural glasses from mid-ocean ridge basalts and from Kilauea. The models relate the measured XANES spectral features directly to buffer-relative fO2 as the predicted variable, avoiding the need for an external measure of the V valence in the experimental glasses used to train the models. It is also shown that by predicting buffer-relative fO2 directly, these models also minimize temperature-relative uncertainties in the calibration. The calibration developed using the Lasso regression model, using a Lasso hyperparameter value of α = 0.0008, yields nickel-nickel oxide (NNO) relative fO2 predictions with a root-mean-square-error of ±0.33 log units. When applied to natural basaltic glasses, the V MVA calibration model generally yields predicted NNO-relative fO2 values that are within the analytical uncertainty of what is calculated using Fe XANES to predict Fe3+/ΣFe. When applied to samples of natural basaltic glass collected in 2014 from an active lava flow at Kilauea, a mean fO2 of NNO-1.15 ± 0.19 (1σ) is calculated, which is generally consistent with other published fO2 estimates for subaerial Kilauea lavas. When applied to a sample of pillow-rim basaltic glass dredged from the East Pacific Rise, calculated fO2 varies from NNO-2.67 (±0.33) to NNO-3.72 (±0.33) with distance from the quenched pillow rim. Fe oxybarometry in this sample provides an fO2 of NNO-2.54 ± 0.19 (1σ), which is in good agreement with that provided by the V oxybarometry within the uncertainties of the modeling. However, the data may indicate that V XANES oxybarometry has greater sensitivity to small changes in fO2 at these more reduced redox conditions than can be detected using Fe XANES.

Keywords: XANES; vanadium; valence; oxygen fugacity; basalts; multivariate analysis

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About the article

Received: 2017-09-28

Accepted: 2018-04-27

Published Online: 2018-07-30

Published in Print: 2018-08-28


Citation Information: American Mineralogist, Volume 103, Issue 8, Pages 1282–1297, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2018-6319.

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