Could you explain what you mean by &#x27;or life on Earth in general&#x27;? Kinetic fractionation is a well-known process. Quoting <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Kinetic_fractionation" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Kinetic_fractionation</a> :<p>&gt; Biological processes are generally unidirectional and are very good examples of &quot;kinetic&quot; isotope reactions. All organisms preferentially use lighter isotopic species, because &quot;energy costs&quot; are lower, resulting in a significant fractionation between the substrate (heavier) and the biologically mediated product (lighter). As an example, photosynthesis preferentially takes up the light isotope of carbon 12C during assimilation of an atmospheric CO2 molecule. This kinetic isotope fractionation explains why plant material (and thus fossil fuels, which are derived from plants) is typically depleted in 13C by 25 per mil (2.5 per cent) relative to most inorganic carbon on Earth.<p>That sounds like life on Earth in general can form large geological concentrations of isotopically shifted material, and it&#x27;s well accepted.