Thermal infrared and Raman microspectroscopy of moganite-bearing rocks

Craig Hardgrove, A. Deanne Rogers

Research output: Contribution to journalArticle

5 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)78-84
Number of pages7
JournalAmerican Mineralogist
Volume98
Issue number1
DOIs
StatePublished - Jan 1 2013
Externally publishedYes

Keywords

  • Chert
  • Infrared spectroscopy
  • Mars
  • Microcrystalline quartz
  • Microspectroscopy
  • Moganite
  • Raman spectroscopy
  • Silica

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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