Heterogeneity within refractory organic matter from CM2 Carbonaceous Chondrites: Evidence from Raman spectroscopy

Potiszil, Christian; Montgomery, W J; Sephton, Mark A.

doi:10.1016/j.epsl.2021.117149

Cited by 5 publications

(14 citation statements)

References 48 publications

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“…22,23,27,28 Raman studies of carbonaceous chondrites link lower frequency G band peaks (ω c (G)) accompanied by D bands to high levels of disorder. 19 The most amorphous (disordered) sample in our set is the HAC film, which has the lowest D band position, while the COSmiC nanograins have the highest D band position. This implies that, while disordered, the COSmIC nanograins contain more organized structures than HAC, more akin to soot.…”

Section: Comparison To Meteoritic Iom and Carbonaceous Materialsmentioning

confidence: 93%

“…This implies that, while disordered, the COSmIC nanograins contain more organized structures than HAC, more akin to soot. Two commonly used ratios to probe the degree of disorder present in organic matter are (i) peak intensity ratio of the D and G bands (R1) and (ii) band area ratios as D/[G + D] (R2 19 ). R2 is appropriate for more organized organic matter, becoming more-or-less constant for values near and above 0.6.…”

Section: Comparison To Meteoritic Iom and Carbonaceous Materialsmentioning

confidence: 99%

“…17 The insoluble OM fraction (IOM) is an organic macromolecular ensemble composed of aromatic moieties held together by highly branched aliphatic chains 18 characterized by its aromatic-rich nature and heteroatom-poor content. 19 Given its high D/H ratio (>10000), 20 IOM is very primitive in nature, and it is suggested to be the source of most of the hydrogen, carbon, nitrogen, and noble gases accreted onto the terrestrial planets. 21 Raman spectroscopic studies have investigated IOM across different classes of meteorites and use statistical analysis of the Raman parameters to compare carbonaceous materials (e.g., refs 19 and 22−28).…”

Section: Introductionmentioning

confidence: 99%

“…PAHs are present in the organic matter (OM) of meteorites, particularly in their insoluble fractions . The insoluble OM fraction (IOM) is an organic macromolecular ensemble composed of aromatic moieties held together by highly branched aliphatic chains characterized by its aromatic-rich nature and heteroatom-poor content . Given its high D/H ratio (>10000), IOM is very primitive in nature, and it is suggested to be the source of most of the hydrogen, carbon, nitrogen, and noble gases accreted onto the terrestrial planets .…”

Section: Introductionmentioning

confidence: 99%

“…Given its high D/H ratio (>10000), IOM is very primitive in nature, and it is suggested to be the source of most of the hydrogen, carbon, nitrogen, and noble gases accreted onto the terrestrial planets . Raman spectroscopic studies have investigated IOM across different classes of meteorites and use statistical analysis of the Raman parameters to compare carbonaceous materials (e.g., refs and − ). These include, for example, correlations between band positions and FWHM for the disorder D and graphitic G bands and empirical D/G band strength ratios.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Raman Spectroscopic Study of Pyrene in Cosmic Dust Analogues: Evolution from the Gas to the Solid Phase

Gavilan

Ricketts

Bejaoui

et al. 2022

ACS Earth Space Chem.

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Raman spectroscopy was employed to characterize pyrene (C16H10), the smallest peri-condensed polycyclic aromatic hydrocarbon (PAH), in microcrystals and in pyrene-derived nanograins. Laboratory spectra in the 200–2000 cm–1 Raman shift region were obtained with a 532 nm laser. The spectrum of microcrystalline pyrene consists of narrow bands (FWHM ∼7 cm–1), in good agreement with previous laboratory measurements of single and powder pyrene crystals, and was compared to density functional theory-computed Raman scattering activities of gas phase pyrene monomer and pyrene tetramer clusters, showing that packing in crystals induces shifts in band positions to higher wavenumbers. On the other hand, the spectrum of pyrene-derived nanograins exhibits a broad graphitic G band at 1587 cm–1 (FWHM ∼56 cm–1) and multiple disorder D bands, the largest one at 1388 cm–1 (FWHM ∼101 cm–1), attributed to defects in the carbonaceous structure. When compared to the D-to-G band strength ratios from the insoluble organic matter (IOM) found in various carbonaceous chondrites, the values found for the pyrene nanograins match those from the highly disordered Allende meteoritic IOM best.

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Section: Comparison To Meteoritic Iom and Carbonaceous Materialsmentioning

confidence: 93%

Section: Comparison To Meteoritic Iom and Carbonaceous Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Raman Spectroscopic Study of Pyrene in Cosmic Dust Analogues: Evolution from the Gas to the Solid Phase

Gavilan

Ricketts

Bejaoui

et al. 2022

ACS Earth Space Chem.

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Insoluble macromolecular organic matter in the Winchcombe meteorite

Sephton

Chan

Watson

et al. 2023

Meteorit & Planetary Scien

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The Winchcombe meteorite fell on February 28, 2021 in Gloucestershire, United Kingdom. As the most accurately recorded carbonaceous chondrite fall, the Winchcombe meteorite represents an opportunity to link a tangible sample of known chemical constitution to a specific region of the solar system whose chemistry can only be otherwise predicted or observed remotely. Winchcombe is a CM carbonaceous chondrite, a group known for their rich and varied abiotic organic chemistry. The rapid collection of Winchcombe provides an opportunity to study a relatively terrestrial contaminant‐limited meteoritic organic assemblage. The majority of the organic matter in CM chondrites is macromolecular in nature and we have performed nondestructive and destructive analyses of Winchcombe by Raman spectroscopy, online pyrolysis–gas chromatography–mass spectrometry (pyrolysis–GC–MS), and stepped combustion. The Winchcombe pyrolysis products were consistent with a CM chondrite, namely aromatic and polycyclic aromatic hydrocarbons, sulfur‐containing units including thiophenes, oxygen‐containing units such as phenols and furans, and nitrogen‐containing units such as pyridine; many substituted/alkylated forms of these units were also present. The presence of phenols in the online pyrolysis products indicated only limited influence from aqueous alteration, which can deplete the phenol precursors in the macromolecule when aqueous alteration is extensive. Raman spectroscopy and stepped combustion also generated responses consistent with a CM chondrite. The pyrolysis–GC–MS data are likely to reflect the more labile and thermally sensitive portions of the macromolecular materials while the Raman and stepped combustion data will also reflect the more refractory and nonpyrolyzable component; hence, we accessed the complete macromolecular fraction of the recently fallen Winchcombe meteorite and revealed a chemical constitution that is similar to other meteorites of the CM group.

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The nature of insoluble organic matter in Sutter's Mill and Murchison carbonaceous chondrites: Testing the effect of x‐ray computed tomography and exploring parent body organic molecular evolution

Cody,

Alexander,

Foustoukos

et al. 2023

Meteorit & Planetary Scien

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This study analyzed samples of the Murchison and Sutter's Mill carbonaceous chondrite meteorites in support of the future analysis of samples returned from the asteroid (10155) Bennu by the OSIRIS‐REx (Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer) mission. Focusing specifically on the insoluble organic matter (IOM), this study establishes that a total of 1.3 g of bulk sample from a single chondritic meteorite are sufficient to obtain a wide range of cosmochemical information, including light element analysis (H, C, and N), isotopic analysis (D/H, 13C/12C, and 15N/14N), and x‐ray fluorescence spectroscopy for major elemental abundances. IOM isolated from the bulk meteorite samples was analyzed by light element and isotopic analysis as described above, 1H and 13C solid‐state nuclear magnetic resonance spectroscopy, Raman spectroscopy, and complete noble gas analyses (abundances and isotopes). The samples studied included a pair from Murchison (CM2), one of which had been irradiated with high‐energy x‐rays in the course of computed tomographic imaging. No differences between the irradiated and non‐irradiated Murchison samples were observed in the many different chemical and spectroscopic analyses, indicating that any x‐ray–derived sample damage is below levels of detection. Elemental, isotopic, and molecular spectroscopic data derived from IOM isolated from the Sutter's Mill sample reveals evidence that this meteorite falls into the class of heated CM chondrites.

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Heterogeneity within refractory organic matter from CM2 Carbonaceous Chondrites: Evidence from Raman spectroscopy

Cited by 5 publications

References 48 publications

Raman Spectroscopic Study of Pyrene in Cosmic Dust Analogues: Evolution from the Gas to the Solid Phase

Raman Spectroscopic Study of Pyrene in Cosmic Dust Analogues: Evolution from the Gas to the Solid Phase

Insoluble macromolecular organic matter in the Winchcombe meteorite

The nature of insoluble organic matter in Sutter's Mill and Murchison carbonaceous chondrites: Testing the effect of x‐ray computed tomography and exploring parent body organic molecular evolution

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