@article{Potiszil:2021:10.1016/j.epsl.2021.117149,
author = {Potiszil, C and Montgomery, W and Sephton, M},
doi = {10.1016/j.epsl.2021.117149},
journal = {Earth and Planetary Science Letters},
pages = {1--10},
title = {Heterogeneity within refractory organic matter from CM2 carbonaceous chondrites: evidence from Raman spectroscopy},
url = {http://dx.doi.org/10.1016/j.epsl.2021.117149},
volume = {574},
year = {2021}
}

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TY  - JOUR
AB  - CM2 chondrites experienced widespread aqueous and short term thermal alteration on their parent bodies. Whilst previous Raman spectroscopic investigations have investigated insoluble organic matter (IOM), they have not taken into account the binary nature of IOM.  Studies employing mass spectrometry have indicated that IOM also known as macromolecular organic matter (MOM) is in fact composed of two distinct fractions: labile organic matter (LOM) and refractory organic matter (ROM). The ROM component represents the aromatic rich and heteroatom poor component of IOM/MOM, whilst the LOM fraction represents a more heteroatom and aliphatic rich component. Here we report Raman 2D maps and spectroscopic data for Murchison and Mighei, both before and after chemical degradation, which attacks and liberates LOM. The removal of LOM simulates the effects of aqueous alteration, where ester and ether bonds are broken and is thought to release some components to the soluble organic matter (SOM) fraction, also known as the free organic matter fraction (FOM). Raman spectroscopy can be used to reveal the nature of bonding (sp2 and sp3) within carbonaceous materials such as meteoritic organic matter, through evaluation of the D and G band peak centres and FWHM values from the recorded data. The presence of sp3 orbitals indicates that the organic materials contain aliphatic linkages and/or heteroatoms. Statistical analysis of the Raman parameters obtained here indicates that the organic matter originating the Raman response is indistinguishable between the bulk (chemically untreated) and chemically degraded (treated with KOH and HI) samples. Such an observation indicates that the ROM fraction is the major contributor to the Raman response of meteoritic organic matter and thus Raman spectroscopy is unlikely to record any aqueous alteration processes that have affected meteoritic organic matter. Therefore, studies which use Raman to probe the IOM are investigating just one of the compone
AU  - Potiszil,C
AU  - Montgomery,W
AU  - Sephton,M
DO  - 10.1016/j.epsl.2021.117149
EP  - 10
PY  - 2021///
SN  - 0012-821X
SP  - 1
TI  - Heterogeneity within refractory organic matter from CM2 carbonaceous chondrites: evidence from Raman spectroscopy
T2  - Earth and Planetary Science Letters
UR  - http://dx.doi.org/10.1016/j.epsl.2021.117149
UR  - https://www.sciencedirect.com/science/article/pii/S0012821X21004040?via%3Dihub
UR  - http://hdl.handle.net/10044/1/90847
VL  - 574
ER  - 

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