Science Advances

Supplementary Materials

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  • table S1. Xe isotopic composition of the kerogen isolated from the MGTKS3 black chert sample and from two Paleozoic—so comparatively younger—kerogens (an anthracite and a type III kerogen called Champclauson) by stepwise heating.
  • table S2. Kr isotopic composition of the kerogen isolated from the MGTKS3 black chert sample by stepwise heating.
  • table S3. Ar isotopic composition of the kerogen isolated from the MGTKS3 black chert sample by stepwise heating.
  • fig. S1. Fission spectrum of MGTKS3 kerogen Xe corrected for mass fractionation relative to U-Xe.
  • fig. S2. Comparison of power law/exponential law fit of the literature data see the study of Avice et al. (2) and references therein on the evolution of atmosphere Xe isotope fractionation over geological periods of time.

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