MicroRaman Spectroscopy of Carbonaceous Chondrites to Constrain Peak Metamorphic Temperature and Mineralogy
Abstract
We utilized confocal microRaman spectroscopy to examine the organic and mineral phases in seven carbonaceous chondrite meteorites: Allende (CV3), Ivuna (CI1), Jbilet Winselwan (CM2), Murchison (CM2), Northwest Africa (NWA) 10675 (CO3), NWA 12328 (CM1), and Tagish Lake (C2-ungrouped). Two of these meteorites (NWA 10675 and NWA 12328) had yet to be examined using this technique. Using the full width at half-maximum (FWHM) of the polyaromatic carbonaceous matter defect (D) band, we estimated their peak metamorphic temperature (PMT). The PMTs show that Allende and NWA 10675 have experienced the highest temperatures, while Ivuna and Tagish Lake experienced the lowest temperatures, consistent with their petrologic classifications. In addition to the carbonaceous matter, we examined the following mineral phases in detail: olivine and pyroxene. For olivine, we calculated the forsterite number (Fo#, a measure of the Mg content) using the doublet peak located in the 800–860 cm −1 region. Finally, we show that the D3 band is well correlated with the PMT, opening the possibility for a new Raman thermometer.
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BibTeX
@article{valle2026microraman,
title = {{MicroRaman Spectroscopy of Carbonaceous Chondrites to Constrain Peak Metamorphic Temperature and Mineralogy}},
author = {Lorraine Roselló del Valle and Kerri Donaldson Hanna and Bertrand Chazallon and Cristian Focsa and Claire Pirim and Christopher Bennett},
journal = {The Planetary Science Journal},
year = {2026},
month = aug,
doi = {10.3847/psj/ae96b5},
url = {https://hal.science/hal-05829152v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - MicroRaman Spectroscopy of Carbonaceous Chondrites to Constrain Peak Metamorphic Temperature and Mineralogy
AU - Lorraine Roselló del Valle
AU - Kerri Donaldson Hanna
AU - Bertrand Chazallon
AU - Cristian Focsa
AU - Claire Pirim
AU - Christopher Bennett
PY - 2026
DA - 2026/08/28
JO - The Planetary Science Journal
DO - 10.3847/psj/ae96b5
UR - https://hal.science/hal-05829152v1
AB - We utilized confocal microRaman spectroscopy to examine the organic and mineral phases in seven carbonaceous chondrite meteorites: Allende (CV3), Ivuna (CI1), Jbilet Winselwan (CM2), Murchison (CM2), Northwest Africa (NWA) 10675 (CO3), NWA 12328 (CM1), and Tagish Lake (C2-ungrouped). Two of these meteorites (NWA 10675 and NWA 12328) had yet to be examined using this technique. Using the full width at half-maximum (FWHM) of the polyaromatic carbonaceous matter defect (D) band, we estimated their peak metamorphic temperature (PMT). The PMTs show that Allende and NWA 10675 have experienced the highest temperatures, while Ivuna and Tagish Lake experienced the lowest temperatures, consistent with their petrologic classifications. In addition to the carbonaceous matter, we examined the following mineral phases in detail: olivine and pyroxene. For olivine, we calculated the forsterite number (Fo#, a measure of the Mg content) using the doublet peak located in the 800–860 cm −1 region. Finally, we show that the D3 band is well correlated with the PMT, opening the possibility for a new Raman thermometer.
SN - 2632-3338
ER -