In-situ mapping of ferric iron variations in lunar glasses using X-ray absorption spectroscopy
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.
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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Artikel in diesem Heft
- Letter
- Chessboard structures: Atom-scale imaging of homologs from the kobellite series
- Special collection: Microporous materials: Crystal-chemistry, properties, and utilizations
- Highlighting the capability of zeolites for agro-chemicals contaminants removal from aqueous matrix: Evidence of 2-ethyl-6-methylaniline adsorption on ZSM-12
- Special collection: Physics and chemistry of earth's deep mantle and core
- Origin and consequences of non-stoichiometry in iron carbide Fe7C3
- Special collection: Isotopes, minerals, and petrology: Honoring John Valley
- Application of mineral equilibria to estimate fugacities of H2O, H2, and O2 in mantle xenoliths from the southwestern U.S.A.
- Review
- Composition, paragenesis, and alteration of the chevkinite group of minerals
- Articles
- Spinel-anorthosites on the Moon: Impact melt origins suggested by enthalpy constraints
- Fast diffusion path for water in silica glass
- Micro- and nano-scale textural and compositional zonation in plagioclase at the Black Mountain porphyry Cu deposit: Implications for magmatic processes
- A XANES and EPMA study of Fe3+ in chlorite: Importance of oxychlorite and implications for cation site distribution and thermobarometry
- Sound velocities across calcite phase transitions by Brillouin scattering spectroscopy
- Trace element distributions in (Cu)-Pb-Sb sulfosalts from the Gutaishan Au-Sb deposit, South China: Implications for formation of high fineness native gold
- A-type carbonate in strontium phosphate apatites
- Discovery of a zinc-rich mineral on the surface of lunar orange pyroclastic beads
- In-situ mapping of ferric iron variations in lunar glasses using X-ray absorption spectroscopy
- Book Review
- Book Review