Synchrotron-Based Three-Dimensional Fourier-Transform Infrared Spectro-Microtomography of Murchison Meteorite Grain

Yeşiltaş, Mehmet; Sedlmair, Julia; Peale, Robert E.; Hirschmugl, Carol J.

doi:10.1177/0003702816671072

Cited by 15 publications

(11 citation statements)

References 63 publications

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“…; Yesiltas et al. ), more precisely to gypsum, an anhydrous calcium sulfate (Lane ). This attribution was confirmed by the Raman analyses through the detection of bands at 1015, 490, and 415 cm −1 (Buzgar et al.…”

Section: Resultsmentioning

confidence: 99%

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Organic and mineralogic heterogeneity of the Paris meteorite followed by FTIR hyperspectral imaging

Dionnet

Aléon-Toppani

Baklouti

et al. 2018

Meteorit & Planetary Scien

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Significant compositional and structural heterogeneity at nm to mm scales is an important characteristic of primitive extraterrestrial materials. Here, we report the analysis of high‐resolution Fourier transform IR hyperspectral imaging analytical measurements at the micron scale on a fragment of the Paris carbonaceous chondrite, supported by Raman and SEM‐EDS measurements. The fragment is crushed in a diamond compression cell. The micro‐FTIR analyses are performed in transmission with two setups, an imaging microscope with a matrix detector using a thermal source and a system using a single point detector coupled with the synchrotron source at the SOLEIL synchrotron facility. We obtain the spatial distribution of chemical/mineralogical components. We confirm at a larger scale (10 μm) the presence of hydrated amorphous silicates observed at a smaller scale (1 μm). Based on the relative abundance of different minerals (hydrated amorphous silicate, olivine, diopside, and serpentine), we propose a sequence of aqueous alteration. Considering the spatial correlation of minerals with organic matter, we discuss the effects of aqueous alteration on the organic matter in bulk. In particular, we detect an increase in the CH2/CH3 ratio in the altered zone and present the possible scenarios that led to the observed chain length shortening/cracking of hydrocarbons.

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Section: Resultsmentioning

confidence: 99%

“…The use of FPA matrix detectors on IR microspectroscopy (see Yesiltas et al. for an application to meteorites) has triggered the development of FTIR microtomography (Martin et al. ; Quaroni et al.…”

Section: Introductionmentioning

confidence: 99%

Organic and mineralogic heterogeneity of the Paris meteorite followed by FTIR hyperspectral imaging

Dionnet

Aléon-Toppani

Baklouti

et al. 2018

Meteorit & Planetary Scien

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“…Finally, for the infrared computed tomography (IR‐CT) measurements (Yesiltas et al, 2016), we collected 180 2D hyperspectral maps (projections) in transmission with a pixel size of 0.66 µm (×25 objective in high magnification mode) and a spectral resolution of 4 cm −1 (for further details, see the method described by Dionnet, Brunetto, et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

Multiscale correlated analysis of the Aguas Zarcas CM chondrite

Dionnet

Aléon-Toppani

Brunetto

et al. 2022

Meteorit & Planetary Scien

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In this paper, we report the results of a campaign of measurements on four fragments of the CM Aguas Zarcas (AZ) meteorite, combining X‐ray computed tomography analysis and Fourier‐transform infrared (FT‐IR) spectroscopy. We estimated a petrologic type for our sampled CM lithology using the two independent techniques, and obtained a type CM2.5, in agreement with previous estimations. By comparing the Si‐O 10‐µm signature of the AZ average FT‐IR spectra with other well‐studied CMs, we place AZ in the context of aqueous alteration of CM parent bodies. Morphological characterization reveals that AZ has heterogeneous distribution of pores and a global porosity of 4.5 ± 0.5 vol%. We show that chondrules have a porosity of 6.3 ± 1 vol%. This larger porosity could be inherited due to various processes such as temperature variation during the chondrule formation and shocks or dissolution during aqueous alteration. Finally, we observed a correlation between 3D distributions of organic matter and mineral at micrometric scales, revealing a link between the abundance of organic matter and the presence of hydrated minerals. This supports the idea that aqueous alteration in AZ’s parent body played a major role in the evolution of the organic matter.

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“…While CRM, as a confocal technique, enables confocal depth profiling which involves consecutive acquisition of Raman HSI at varying z-positions, [40][41][42][43] IR spectro-microtomography records HSI as a function of a sample's rotational angle. [44][45][46] Tomographic reconstruction of tilt series of HSIs by different projection methods permits computation of voxel spectra for each spatial [x,y,z] coordinate of a given volume. Hyperspectral imaging from serial sample sections represents the third approach to produce HSV.…”

Section: Spatially Resolved Vibrational Spectroscopymentioning

confidence: 99%

Two-Dimensional Correlation Spectroscopy (2D-COS) for Analysis of Spatially Resolved Vibrational Spectra

2019

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The last two decades have seen tremendous progress in the application of two-dimensional correlation spectroscopy (2D-COS) as a versatile analysis method for data series obtained using a large variety of different spectroscopic modalities, including infrared (IR) and Raman spectroscopy. The analysis technique is applicable to a series of spectra recorded under the influence of an external sample perturbation. Two-dimensional COS analysis is not only helpful to decipher correlations, which may exist between distinct spectral features, but can also be utilized to obtain the sequence of individual spectral changes. The focus of this review article is on the application of 2D-COS for analyzing spatially resolved data with special emphasis on hyperspectral imaging (HSI) study. In this review, we briefly introduce the fundamentals of the generalized 2D-COS analysis approach, discuss specific points of 2D-COS application to spatially resolved spectra and demonstrate essential aspects of data pre-processing for 2D-COS analysis of spatially resolved spectra. Based on illustrative examples, we show that 2D-COS is useful for spectral band assignment in HSI applications and demonstrate its utility for detecting subtle correlations between spectra features, or between features from different imaging modalities in the case of heterospectral (multimodal) HSI. Furthermore, a short overview on existing 2D-COS software tools is provided. It is hoped that this article represents not only a useful guideline for 2D-COS analyses of spatially resolved hyperspectral data but supports also further dissemination of the 2D-COS analysis method as a whole.

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Synchrotron-Based Three-Dimensional Fourier-Transform Infrared Spectro-Microtomography of Murchison Meteorite Grain

Cited by 15 publications

References 63 publications

Organic and mineralogic heterogeneity of the Paris meteorite followed by FTIR hyperspectral imaging

Organic and mineralogic heterogeneity of the Paris meteorite followed by FTIR hyperspectral imaging

Multiscale correlated analysis of the Aguas Zarcas CM chondrite

Two-Dimensional Correlation Spectroscopy (2D-COS) for Analysis of Spatially Resolved Vibrational Spectra

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