Quantification of water in majoritic garnet

Thomas, Steven; Wilson, K.; Koch‐Müller, Monika; Hauri, E. H.; McCammon, Catherine; Jacobsen, S. D.; Lazarz, John D.; Rhede, Dieter; Ren, Minghua; Blair, Neal E.; Lenz, Swantje

doi:10.2138/am-2015-5136

Cited by 16 publications

(15 citation statements)

References 68 publications

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“…Previous studies testing the use of Raman spectroscopy to determine the water content in nominally anhydrous minerals concentrated on garnet and enstatite (Thomas et al 2008b(Thomas et al , 2015; Bolfan-Casanova et al…”

Section: Discussionmentioning

confidence: 99%

“…Arredondo and Rossman 2002). In previous works, the detection limits were occasionally rather high (~ 1000 ppm), however, recent studies showed that detection of water contents down to ~ 3 ppm is possible (Arredondo and Rossman 2002;Thomas et al 2008bThomas et al , 2009Thomas et al , 2015Bolfan-Casanova et al 2014). The detection of very low water contents in garnets (3 to 50 ppm H 2 O), however, required a high laser power (1 W, 140 mW on the sample; see Thomas et al 2008b).…”

Section: Spectral Quality and Detection Limitmentioning

confidence: 99%

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Hydrogen analysis in nominally anhydrous minerals by transmission Raman spectroscopy

2018

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We present a new approach for the analysis of water in nominally anhydrous minerals using transmission Raman spectroscopy. Using this approach, the laser was shone through thin, nearly transparent samples of clinopyroxene, garnet and synthetic rhyolite glass. To remove mineral-induced background and to improve the quality of the OH spectral region, specifically for clinopyroxene, a reference spectrum of a dehydrated crystal was measured and subtracted. Water contents of all clinopyroxene samples were previously determined by Fourier transformed infrared spectroscopy (FTIR). The application of transmission Raman spectroscopy and a reference spectrum of a dry sample revealed a noticeable improvement in the quality of spectra and thus the detection limit, compared to the standard backscattering configurations. We show that the quality of transmission spectra and the detection limit depend on the sample thickness, and that the thickness has to be taken into account when measuring and comparing OH-integrated intensity and water content if the results are used for OH quantification.

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Section: Discussionmentioning

confidence: 99%

Section: Spectral Quality and Detection Limitmentioning

confidence: 99%

Hydrogen analysis in nominally anhydrous minerals by transmission Raman spectroscopy

2018

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“…When comparing IR to NMR in this work, it is also important to have in mind that the OH stretching mode absorption coef-cients for different species can be signicantly different. 11,19,67 Interestingly, evidence exists showing that the absorption coefficient is an extremely sensitive probe for the local structure around an OH bond, while the frequency is also strongly inuenced by longer range interactions in the water network. 34 Here, we shall not attempt to quantify absolutely the different species observed.…”

Section: Rsc Advances Papermentioning

confidence: 99%

Structural evolution of water and hydroxyl groups during thermal, mechanical and chemical treatment of high purity natural quartz

et al. 2020

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“…As numerous factors may affect the measurement efficiency (such as variation of focusing depth or surface quality), using the ratio of the OH band area over that of silica bands area reduces the data dispersion or scatter, as both regions are equally affected by focusing or surface variations. Calibrations of the method have been proposed by Thomas et al (2008 and for garnet, Bolfan-Casanova et al (2014) for olivine, Thomas et al (2015) for ringwoodite, and Weis et al (2018) for orthopyroxene (this last study having used also forward-scattering).…”

Section: Introductionmentioning

confidence: 99%

Water quantification in olivine and wadsleyite by Raman spectroscopy and study of errors and uncertainties

Martinek

Bolfan-Casanova

2021

American Mineralogist

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The study of nominally anhydrous minerals with vibrational spectroscopy, despite its sensitivity, tends to produce large uncertainties (in absorbance or intensity) if the observed dispersion of the values arising from the anisotropy of interaction with light in non-cubic minerals is not assessed. In this study, we focused on Raman spectroscopy, which allows the measurement of crystals down to few micrometers in size in back-scattered geometry, and with any water content, down to 200 ppm by weight of water. Using synthetic hydrous single-crystals of olivine and wadsleyite, we demonstrate that under ideal conditions of measurement and sampling, the data dispersion reaches ±30% of the average (at 1σ) for olivine, and ±32% for wadsleyite, mostly because of their natural anisotropy. As this anisotropy is linked to physical properties of the mineral, it should not be completely considered as error without treatment. By simulating a large number of measurements with a 3D model of the OH/Si spectral intensity ratio for olivine and wadsleyite as a function of orientation, we observe that although dispersion increases when increasing the number of measured points in the sample, analytical error decreases, and the contribution of anisotropy to this error decreases. With a sufficient number of This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America. The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Quantification of water in majoritic garnet

Cited by 16 publications

References 68 publications

Hydrogen analysis in nominally anhydrous minerals by transmission Raman spectroscopy

Hydrogen analysis in nominally anhydrous minerals by transmission Raman spectroscopy

Structural evolution of water and hydroxyl groups during thermal, mechanical and chemical treatment of high purity natural quartz

Water quantification in olivine and wadsleyite by Raman spectroscopy and study of errors and uncertainties

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