MicroRaman Spectroscopy of Carbonaceous Chondrites to Constrain Peak Metamorphic Temperature and MineralogyOPEN ACCESS 

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Lorraine Roselló Del Valle, Kerri L. Donaldson Hanna, Bertrand Chazallon, Cristian Fosca, Claire Pirim and Christopher Bennett

The Planetary Science Journal, Volume 7, Number 8, published: 28 August 2026

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“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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