Crystal chemistry of Fe-Mg carbonates retrieved through Raman and near-infrared remote sensing

Publication

Reference: Beck P., Beyssac O., Schmitt B., Brown A. J., Royer C., Mandon L., Boulard E., Rividi N. (2024). Crystal chemistry of Fe-Mg carbonates retrieved through Raman and near-infrared remote sensing. Earth Space Sci., submitted for publication.

Names

Title: Crystal chemistry of Fe-Mg carbonates retrieved through Raman and near-infrared remote sensing
Abstract: On Earth carbonate minerals are widely used as recorders of the geological environments in which they formed. Here we present a method designed to retrieve the crystal chemistry of Fe-Mg carbonate minerals using infrared or Raman remote sensing. We analyzed a suite of well-characterized Fe-Mg carbonate minerals for which Raman spectra were obtained in two different laboratories, and IR spectra were measured in reflectance and transmission from the visible range to 25-µm. We build calibration lines for the dependence of fundamental and harmonic vibrational modes position to the Mg# (defined as Mg#=100*Mg/(Mg+Fe+Ca+Mn)). These calibrations should enable retrieval of Mg# based on remote sensing observations with a typical accuracy of 10. We discuss the framework of applicability of these calibrations and apply them to a typical CRISM spectrum of carbonates from the Nilli Fossae region of Mars.
Keywords: spectroscopy, reflectance, transmission, Raman spectroscopy, Vis, NIR, MIR, FIR, KBr pellet, band position, band attribution, minerals, composition, carbonate, magnesite, siderite, MgCO3, FeCO3, Fe, Mg, Planetary Science, Mars, Asteroid
Content: band list data, spectral data, planetary sciences