Application of visible and infrared spectroscopy for the evaluation of evolved glauconite

Shovan L. Chattoraj (Corresponding Author), Santanu Banerjee, Freek van der Meer, P.K. Champati Ray

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
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Abstract

The Oligocene Maniyara Fort Formation in western India exhibits two distinct glauconite types with different maturation states, which are characterized by their spectral response in the visible to infrared spectrum of electromagnetic radiation. Spectral signatures of Maniyara Fort glauconites display absorption features at approximately 0.77, 1.08, 1.9, 2.3 μm in the visible-short-wave infrared (SWIR) and 2.8 and 10 μm in the mid-infrared (MIR) region which vary with K 2O content of glauconite. The spectra of glauconite varies significantly as a function of its cationic contents and substitution in different sites. The maturity is found to increase in tandem with the metal–metal charge transfer (CT) and the Fe 2+ dd absorption band respectively at 1.08 and 0.77 μm. H 2O and OH signatures at the NIR region reflect differences in the sensitivity of glauconites with different molecular H 2O content. In the MIR region, a gradual shift of the Si–O stretch at 10 μm towards lower wavelengths indicates the dominance of smectite layers in glauconites. This study demonstrates a strong correlation between the proportion of expandable layers in the glauconite structure with variations in characteristic band position, depth and symmetry in reflectance and emissivity.

Original languageEnglish
Pages (from-to)301-310
Number of pages10
JournalInternational Journal of Applied Earth Observation and Geoinformation (JAG)
Volume64
Early online date23 Feb 2017
DOIs
Publication statusPublished - 1 Feb 2018

Fingerprint

glauconite
infrared spectroscopy
Infrared spectroscopy
Infrared radiation
electromagnetic radiation
emissivity
Electromagnetic waves
smectite
symmetry
Charge transfer
maturation
Oligocene
Absorption spectra
reflectance
substitution
Substitution reactions
Display devices
wavelength
Wavelength
evaluation

Keywords

  • ITC-ISI-JOURNAL-ARTICLE
  • Expandable layers
  • Visible-SWIR
  • Emissivity
  • Glauconite maturity
  • Reflectance

Cite this

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title = "Application of visible and infrared spectroscopy for the evaluation of evolved glauconite",
abstract = "The Oligocene Maniyara Fort Formation in western India exhibits two distinct glauconite types with different maturation states, which are characterized by their spectral response in the visible to infrared spectrum of electromagnetic radiation. Spectral signatures of Maniyara Fort glauconites display absorption features at approximately 0.77, 1.08, 1.9, 2.3 μm in the visible-short-wave infrared (SWIR) and 2.8 and 10 μm in the mid-infrared (MIR) region which vary with K 2O content of glauconite. The spectra of glauconite varies significantly as a function of its cationic contents and substitution in different sites. The maturity is found to increase in tandem with the metal–metal charge transfer (CT) and the Fe 2+ dd absorption band respectively at 1.08 and 0.77 μm. H 2O and OH − signatures at the NIR region reflect differences in the sensitivity of glauconites with different molecular H 2O content. In the MIR region, a gradual shift of the Si–O stretch at 10 μm towards lower wavelengths indicates the dominance of smectite layers in glauconites. This study demonstrates a strong correlation between the proportion of expandable layers in the glauconite structure with variations in characteristic band position, depth and symmetry in reflectance and emissivity.",
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Application of visible and infrared spectroscopy for the evaluation of evolved glauconite. / Chattoraj, Shovan L. (Corresponding Author); Banerjee, Santanu; van der Meer, Freek; Champati Ray, P.K.

In: International Journal of Applied Earth Observation and Geoinformation (JAG), Vol. 64, 01.02.2018, p. 301-310.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Application of visible and infrared spectroscopy for the evaluation of evolved glauconite

AU - Chattoraj, Shovan L.

AU - Banerjee, Santanu

AU - van der Meer, Freek

AU - Champati Ray, P.K.

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N2 - The Oligocene Maniyara Fort Formation in western India exhibits two distinct glauconite types with different maturation states, which are characterized by their spectral response in the visible to infrared spectrum of electromagnetic radiation. Spectral signatures of Maniyara Fort glauconites display absorption features at approximately 0.77, 1.08, 1.9, 2.3 μm in the visible-short-wave infrared (SWIR) and 2.8 and 10 μm in the mid-infrared (MIR) region which vary with K 2O content of glauconite. The spectra of glauconite varies significantly as a function of its cationic contents and substitution in different sites. The maturity is found to increase in tandem with the metal–metal charge transfer (CT) and the Fe 2+ dd absorption band respectively at 1.08 and 0.77 μm. H 2O and OH − signatures at the NIR region reflect differences in the sensitivity of glauconites with different molecular H 2O content. In the MIR region, a gradual shift of the Si–O stretch at 10 μm towards lower wavelengths indicates the dominance of smectite layers in glauconites. This study demonstrates a strong correlation between the proportion of expandable layers in the glauconite structure with variations in characteristic band position, depth and symmetry in reflectance and emissivity.

AB - The Oligocene Maniyara Fort Formation in western India exhibits two distinct glauconite types with different maturation states, which are characterized by their spectral response in the visible to infrared spectrum of electromagnetic radiation. Spectral signatures of Maniyara Fort glauconites display absorption features at approximately 0.77, 1.08, 1.9, 2.3 μm in the visible-short-wave infrared (SWIR) and 2.8 and 10 μm in the mid-infrared (MIR) region which vary with K 2O content of glauconite. The spectra of glauconite varies significantly as a function of its cationic contents and substitution in different sites. The maturity is found to increase in tandem with the metal–metal charge transfer (CT) and the Fe 2+ dd absorption band respectively at 1.08 and 0.77 μm. H 2O and OH − signatures at the NIR region reflect differences in the sensitivity of glauconites with different molecular H 2O content. In the MIR region, a gradual shift of the Si–O stretch at 10 μm towards lower wavelengths indicates the dominance of smectite layers in glauconites. This study demonstrates a strong correlation between the proportion of expandable layers in the glauconite structure with variations in characteristic band position, depth and symmetry in reflectance and emissivity.

KW - ITC-ISI-JOURNAL-ARTICLE

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KW - Visible-SWIR

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KW - Reflectance

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SN - 1569-8432

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