Fractionation of carbon isotopes in Methanosarcina barkeri

Feedback of the metamorphic changes on the subducting processes

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Many large-scale dynamic processes, from continental rifting to plate subduction, are intimately linked to metamorphic reactions. These sources may include abiotic CO 2 reduction, thermogenic cracking of hydrocarbons, microbial production by Euryarchaeota, and direct CH 4 emissions by terrestrial plants (Keppler et al, 2006). For example, during the subduction-collision processes, rocks will be exposed to changing temperature, pressures and stress regimes.

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“…These sources may include abiotic CO 2 reduction, thermogenic cracking of hydrocarbons, microbial production by Euryarchaeota, and direct CH 4 emissions by terrestrial plants (Keppler et al, 2006). Despite this, there is little quantitative understanding of the various methane sources to the atmosphere and hydrosphere.…”