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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 13.

Figure 13.

Comparison of the IOM compositions from five Tagish Lake lithologies (Herd et al., 2011; Alexander et al., 2014) and the products of hydrothermal experiments on Murchison IOM conducted at three temperatures for 72 hours by Oba and Naraoka (2009). Also shown are the IOM compositions CI, CM, CR, CV and CO chondrites (Alexander et al., 2007b). The experiments parallel the Tagish Lake IOM samples. Both the Tagish Lake samples and experimental products cover wide ranges in H/C. In the case of the Tagish Lake samples, this range is from CR-like to H/C ratios that resemble heated CMs and the least metamorphosed CVs and COs. However, the Tagish Lake and experiment trends do not reproduce the full range of H/C and H isotopic compositions found in carbonaceous and ordinary (Fig. 1) chondrites. It seems likely that neither the experimental conditions nor the conditions experienced by the Tagish Lake lithologies cover the full range of parent body conditions experienced by the chondrites.