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Analyzing Raman - Infrared spectral correlation in the recently found meteorite Csátalja.

A Kereszturi1, I Gyollai2, Zs Kereszty3

  • 1Research Centre for Astronomy and Earth Sciences, Konkoly Thege Miklos Astronomical Institute, H-1121 Budapest, Konkoly Thege Miklós út 15-17, Hungary.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|October 26, 2016
PubMed
Summary
This summary is machine-generated.

This study analyzes shock indicators in the Csátalja meteorite using Raman and infrared spectroscopy. It refines methods for assessing shock impact alteration in minerals, providing new reference spectra for standardization.

Keywords:
FTIRInfrared spectroscopyMeteoriteRaman spectroscopySilicate minerals

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Area of Science:

  • Mineralogy
  • Planetary Science
  • Spectroscopy

Background:

  • Shock impact alteration studies in meteorites have historically underutilized infrared spectro-microscopic analysis.
  • Standardization of measurement techniques for shock indicators is crucial for comparative studies.

Purpose of the Study:

  • To identify and refine shock indicators in minerals using Raman and infrared spectroscopy.
  • To provide reference spectra for the scientific community to standardize Infrared Attenuated Total Reflectance (IR ATR) measurements.
  • To investigate shock impact alteration in the Csátalja ordinary chondrite.

Main Methods:

  • Correlating Raman and infrared spectra with Electron Probe Microanalysis (EPMA) composition data.
  • Utilizing infrared spectro-microscopic analysis and Raman spectroscopy.
  • Applying the Attenuated Total Reflectance (ATR) method for spectral acquisition.

Main Results:

  • Raman spectra of olivine showed shifts and increased Full Width at Half Maximum (FWHM) with increasing shock stage.
  • Infrared spectra revealed correlations between band positions, absorbance, and shock effects, confirming shock-induced disordering.
  • Shocked pyroxenes exhibited peak broadening and shifts beyond chemical alteration effects; specific FTIR bands disappeared at higher shock levels.
  • Maskelynite formation indicated peak shock pressures potentially reaching 20 GPa in localized areas.
  • Heterogeneous shock effects were observed at small spatial scales, with identified shock levels exceeding previous studies.

Conclusions:

  • Infrared spectro-microscopic analysis is a valuable tool for studying shock impact alteration in meteorites.
  • The study provides essential reference spectra and context for standardizing IR ATR measurements.
  • Shock pressures in the Csátalja meteorite ranged from 2-6 GPa to potentially 20 GPa, with significant heterogeneity observed.