Redox constraints on a Cenozoic imbalance in the organic carbon cycle

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ID: 305006
2020
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Abstract
Over geological timescales, variations in atmospheric O~2~ are typically attributed to the imbalance between the weathering of organic carbon (OC) and reduced sulfur on land, the major sink terms for atmospheric O~2~, and the burial of OC and reduced sulfur in marine sediments, the major source terms of O~2~ to the atmosphere. But the Fe cycle matters too. Using a compilation of C, Fe, S and H fluxes between the Earth9s exosphere, continents, and mantle reservoirs, I demonstrate that hydrothermal weathering of the oceanic lithosphere and volcanic degassing of SO~2~ have acted as net sinks of O~2~, amounting to *ca*. 2.7 ± 1.1 Tmol O~2~/y, over the Cenozoic. Near constancy of atmospheric oxygen concentrations over the same interval of time suggests that this igneous sink is compensated by the sedimentary cycles of C, S and Fe. The net subduction and accretion of OC likely made the dominant contribution and, therefore, operated as a net source of atmospheric O~2~ over the last 50-60 Myr. This result implies that redox steady-state in the Cenozoic is dynamically maintained by a net input of solar (photosynthetic) energy, ∼ 0.8 to 2 EJ/y, into the lithospheric cycles of C, S and Fe.
Reference Key
openalex_W3107065456 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Matthieu E. Galvez
Journal american journal of science
Year 2020
DOI
10.2475/10.2020.03
URL
https://doi.org/10.2475/10.2020.03
Keywords Keywords not found

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