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Thermal infrared and Raman microspectroscopy of moganite-bearing rocks
-
Craig Hardgrove
und
A. Deanne Rogers
Veröffentlicht/Copyright:
7. März 2015
Abstract
We present the first thermal infrared reflectance spectral characterization of moganite and mixtures of moganite with microcrystalline quartz. We find that for relatively high (>50%) abundances of moganite, the absolute reflectance for samples is significantly reduced. Using microscopic-Raman (~1 μm/pixel) measurements, we estimate the moganite content for various samples. We then compare Raman-derived moganite abundances with microscopic infrared reflectance (25 μm/pixel) spectra to determine the effects of increasing moganite abundance on thermal infrared spectra. We find that moganite is broadly spectrally similar to quartz with major reflectance maxima located between ~1030 and 1280 cm-1 and ~400 and 600 cm-1; but there are characteristic differences in the peak shapes, peak center positions, and especially the relative peak reflectance magnitudes. For regions with high (>50%) moganite content, the relative magntitudes of the reflectance maxima at 1157 and 1095 cm-1 (R1095/ R1157 band ratio) can be used to estimate the moganite content. This work demonstrates the utility of thermal infrared microspectroscopy in isolating phases that are intimately mixed in a sample, and has applications in planetary science, where constituent phases of quartz-rich sedimentary rocks can be identified using remote or in situ thermal infrared spectroscopy.
Keywords : Moganite; chert; microcrystalline quartz; silica; Raman spectroscopy; infrared spectroscopy; microspectroscopy; Mars
Received: 2012-3-1
Accepted: 2012-8-13
Published Online: 2015-3-7
Published in Print: 2013-1-1
© 2015 by Walter de Gruyter Berlin/Boston
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Schlagwörter für diesen Artikel
Moganite;
chert;
microcrystalline quartz;
silica;
Raman spectroscopy;
infrared spectroscopy;
microspectroscopy;
Mars
Artikel in diesem Heft
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- Coupled H and Nb, Cr, and V trace element behavior in synthetic rutile at 600 °C, 400 MPa and possible geological application
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