Figure 21.

FTIR vibrational modes for IOM from Ryugu particles and Orgueil (CI1) from this study, isolated via HCl/HF demineralization, and type 1, 2 and 3 carbonaceous chondrites from the literature.⁷²⁾ The groups A to D refer to: A). Type 1 and 2 carbonaceous chondrites that are most representative of their original organic precursors, B). Carbonaceous chondrites that have undergone either low-temperature oxidation or low-grade thermal metamorphism, C). Intense thermal metamorphism with low H₂O activity and D). Intense thermal metamorphism with high H₂O activity. Note that the particle names have the first two zeros removed and aliphatics refers to the sum of the CH_x band intensities.