Startseite In-situ mapping of ferric iron variations in lunar glasses using X-ray absorption spectroscopy
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In-situ mapping of ferric iron variations in lunar glasses using X-ray absorption spectroscopy

  • Molly C. McCanta EMAIL logo , M. Darby Dyar , Antonio Lanzirotti , Matthew Newville und Laura B. Breitenfeld
Veröffentlicht/Copyright: 26. Februar 2019
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Abstract

This paper presents a new X-ray absorption spectroscopy (XAS) method for making two-dimensional maps of Fe3+ in-situ in polished glass samples, which opens the door to study redox changes associated with magmatic processes such as crystallization, assimilation, ascent, and eruption. Multivariate analysis (MVA) allows selection of specific channels in a spectrum to inform predictions of spectral characteristics. Here, the sparse model of the least absolute shrinkage and selection operator (Lasso) is used to select key channels in XAS channels that can be used to predict accurate in-situ Fe3+ analyses of silicate glasses. By tuning the model to use only six channels, analytical time is decreased enough to allow mapping of Fe3+ variations in samples by making gridded point analyses at the scale of the XAS beam (1–2 μm). Maps of Fe3+ concentration can then be constructed using freely available, open source software (http://cars.uchicago.edu/xraylarch/). This result shows the enormous potential of using MVA to select indicative spectral regions for predicting variables of interest across a wide variety of spectroscopic applications. Redox gradients in lunar picritic glass beads first observed with point analyses are confirmed through this XAS mapping and suggest degassing processes during ascent and eruption are responsible for the range of Fe3+ values measured in these samples.

  1. Funding This research was supported by NASA grant NNX16AR18G to M.C.M., NSF grants EAR-1219761 to M.D.D. and EAR-1219850 to M.C.M., and RIS4E, SEEED, and VORTICES nodes of NASA SSERVI.

Acknowledgments

We thank J. Boesenberg and A. Patchen for their assistance with electron microprobe analyses. The authors also thank the NASA Curation and Analysis Planning Team for Extraterrestrial Materials (CAPTEM) and M. Rutherford for access to the lunar glass beads used in this study.

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Received: 2018-10-29
Accepted: 2018-12-06
Published Online: 2019-02-26
Published in Print: 2019-03-26

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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