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. Author manuscript; available in PMC: 2019 Apr 17.
Published in final edited form as: Chem Erde. 2017 Jan 26;77(2):227–256. doi: 10.1016/j.chemer.2017.01.007

Figure 9.

Figure 9.

Average bulk XANES spectra of IOM from several primitive carbonaceous chondrites: Murchison (CM2), Orgueil (CI1), QUE 99177 (CR2), Tagish Lake (C2, lithology 5b) and ALH 77307 (CO3.0). The C XANES spectra show the greatest variation in functional chemistries between different meteorite groups and petrologic types, but are still very similar. As shown in the representative spectrum from Tagish Lake, the N XANES spectra from primitive IOM are relatively featureless, only containing minor spectral “shoulders” on the main N absorption edge. In addition, IOM O XANES spectra rarely show spectral features other than the main π* and σ* peaks for C=O and C-O bonds, respectively. The C XANES data are taken from De Gregorio et al. (2013), while the data for Tagish Lake are unpublished.