Quantification of Crystal Chemistry of Fe‐Mg Carbonates by Raman Microspectroscopy 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 remote sensing or Raman spectroscopy. We analyzed a suite of well‐ch...

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Bibliographic Details
Published in:Earth and Space Science
Main Authors: Pierre Beck, Olivier Beyssac, Bernard Schmitt, Clement Royer, Lucia Mandon, Eglantine Boulard, Nicolas Rividi, Edward A. Cloutis
Format: Article
Language:English
Published: American Geophysical Union (AGU) 2024-09-01
Subjects:
Mars
asteroid
carbonate
Raman
infrared
Online Access:https://doi.org/10.1029/2024EA003666
Description
Summary: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 remote sensing or Raman spectroscopy. 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 built 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 spectroscopic 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.
ISSN:2333-5084

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