Abstract
Oxygenation of Earth’s atmosphere and oceans played a pivotal role in the evolution of the surface environment and life. It is thought that the rise in oxygen over Earth’s history was driven by an increasing availability of the photosynthetic limiting nutrient phosphate combined with declining oxygen-consuming inputs from the mantle and crust. However, it has been difficult to assess whether these processes alone can explain Earth’s oxygenation history. Here we develop a theoretical framework for the long-term global oxygen, phosphorus and carbon cycles, incorporating potential trajectories for the emergence of continents, the degassing of mantle volatiles and the resulting increase in the size of the crustal carbonate reservoir. We find that we can adequately simulate the Earth’s oxygenation trajectory in both the atmosphere and oceans, alongside reasonable reconstructions of planetary temperature, atmospheric carbon dioxide concentration, phosphorus burial records and carbon isotope ratios. Importantly, this is only possible when we include the accumulation of carbonates in the crust, which permits ever-increasing carbon recycling rates through weathering and degassing. This carbonate build-up is a missing factor in models of Earth’s coupled climate, nutrient and oxygen evolution and is important for reconstructing Earth’s history and potential exoplanet biogeochemistry.
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Main
Understanding Earth’s gradual oxygenation tests the planetary boundary conditions that permit intelligent life. Earth’s oxygenation included at least two broad steps: the Great Oxidation Event (GOE; 2.4–2.2 Ga (refs. 1,2)) and the Paleozoic Oxygenation Event (~450–400 Ma (refs. 3,4)) with mixed evidence for an intermediate step or period of instability during the Neoproterozoic Era (~800–540 Ma (refs. 5,6)). Studies have investigated the drivers of these events and to what degree they were driven by biological or geodynamic changes (for example, refs. 7,8).
The trajectory towards an oxygenated surface environment must have been driven by a rise in molecular oxygen (O2) production or a decline in its consumption or a combination of both. Long-term photosynthetic oxygen production depends on the availability of the limiting nutrient phosphate9, therefore increasing bioavailable phosphorus fluxes from the continents to the oceans are widely postulated to have driven oxygenation, for example, due to increasingly exposed continental landmass (for example, ref. 10) or enhanced weathering driven by the evolution of land plants (for example, ref. 11). A decline in reductant availability on Earth’s surface is also a potential driver of oxygenation, either in discrete steps through volcanic regime changes12 or changes in the oxidation state of volcanic and hydrothermal outputs1.
The above source and sink arguments are reasonable and self-consistent, but the roles they play relative to each other in the combined carbon, oxygen and phosphorus cycles has not been established. Recent modelling shows that the broad oxygenation history of Earth can be suitably reproduced by either increasing the oxygen source or decreasing oxygen sinks over Earth’s history7.
Developing a theoretical understanding of the combined atmospheric and oceanic oxygen sources and sinks over Earth’s history is challenging. One challenge is the regulation of surface temperature and CO2 by temperature-dependent silicate weathering13. Here the global weathering rate adjusts to match the rate of CO2 degassing, but this potentially results in extreme silicate weathering rates on the early Earth (if degassing rates were high) and a high rate of phosphate delivery and O2 production.
A further complication is the carbonate δ13C isotope record. This isotopic ratio is a product of changing carbon inputs and burial rates of inorganic and organic carbon. The record shows relative stability through all of Earth’s history, with no large secular trends, invoking relatively invariable organic carbon burial and oxygen production1,14, potentially requiring a decline in O2 sink fluxes to explain oxygenation12,15. However, recent work determines that input of the lighter isotope would have been curtailed through restricted organic matter weathering on the anoxic ancient Earth; thus, the static δ13C record may be reconciled with rising primary productivity over Earth’s history16,17,18.
Given recent advances, a consistent quantitative model for the evolution of Earth’s carbon, oxygen and phosphorus cycles seems possible. In this Article, we develop a version of this (Fig. 1). The structure of this model is based on the five-box ocean and atmosphere model of Alcott et al.7, with additions of an inorganic carbon cycle and simple climate based on the carbon, oxygen, phosphorus, sulfur and evolution (COPSE) model19,20, allowing the model to dynamically calculate surface temperature, continental weathering rates and carbon isotope ratios. This new model does not permit fixing major components of the oxygen cycle, which are instead determined by the underlying tectonics and model climate (see Supplementary Information for the model description).
Modelling the Earth system
Our model produces an emergent planetary state based on a small set of boundary conditions (Fig. 2). These initially include tectonic degassing of CO2, exposure of the continents and possible biotic enhancement of weathering from the Paleozoic-present due to plant colonisation (Fig. 2a–c). Most studies propose a decline in degassing rates over Earth’s history due to mantle cooling21. We use the estimate of Hayes and Waldbauer22, with a 25–200% uncertainty window. Several different reconstructions are proposed for the exposure of subaerial landmass throughout Earth’s history23,24,25, so we adopt the Monte-Carlo parameter range used by Krissansen-Totten et al.26 and add possible high-landmass options for the Archean. Increasing weathering efficiency due to the rise of land plants is also poorly constrained, and we also use the Monte-Carlo range of this parameter from Krissansen-Totten et al.26, with the maximum change following the COPSE model19 and the minimum assuming no enhancement.
We also vary the extent of phosphorus recycling in anoxic marine settings, testing C:P ratios of sedimentary organic matter overlain by anoxic water between 106 and 1,100, representing either no release or substantial preferential release27 of phosphorus from these sediments and generally proposed to be associated with ferruginous or euxinic settings, respectively. Higher biomass C:P ratios (up to 300 (ref. 28)) may potentially occur under P-limited conditions during the Proterozoic, but we do not consider this independently. The model is run 1,000 times, subject to a random distribution of these parameter choices and initially using only forcings from Fig. 2a–c, with results shown in Fig. 3. Despite some encouraging results, such as the stability of carbonate δ13C, several major issues arise where the model cannot fit the long-term geological record.
These effects are generally caused by elevated carbon outgassing22 and rapid weathering of fossil organic carbon (due to high O2 and organic C burial), which together lead to higher CO2 and surface temperature than the proxies suggest26,29. The uncertainty window does allow for static degassing rates over time30, which is still insufficient to bring the model in line with the geological record. While such high temperatures are incompatible with the evidence for glaciation in the Archean and Paleoproterozoic, they are potentially supported by evidence for low-viscosity Archean oceans31 and silicon isotopes32, so they are not sufficient alone to falsify the model over long timescales. Our model uses a simple dimensionless climate approximation, but the CO2–temperature relationships are broadly similar to climate models for the Archean33, which were tested up to 0.2 bar CO2. For CO2 levels above this, our estimates become less accurate, and falsifying the results becomes more difficult.
A clearer mismatch between the model and data is atmospheric oxygen. There is strong evidence for less than 1 ppm atmospheric O2 during the Archean34, which is sufficient to falsify this version of the model. While a more accurate approximation of temperature may act to change the model oxygen level in the Archean, we can see that even when considering the lower end of the uncertainty range (which is supported by the GCM simulations), there are no low-oxygen solutions. A very high Archean reductant flux could potentially make this model consistent with the oxygenation record7, but such high fluxes are contentious29.
Introducing a crustal carbonate reservoir
We now explore an important mechanism that has not been included in coupled climate–oxygen–nutrient models for Earth’s history. The primordial Earth had a silicate crust, but continual degassing of CO2 and reactions with these silicate minerals has caused build-up of crustal carbonates over time, and they are now the largest store of crustal carbon23,35. An important consequence of this carbonate build-up is that continental rifts and arcs mobilize more carbon through metamorphism (hence why their activity has been linked to greenhouse–icehouse climate cycles during the Phanerozoic36). Thus, an increasing crustal carbonate reservoir could imply a rising rate of CO2 degassing, even if the mantle heat flow were to decrease substantially, or stay static, over time. This mechanism has been hypothesized to promote oxygenation22,37, and previous modelling implied a trend towards oxygenation before the model breaks down8, but it has not been included in a coupled model including carbon, nutrients and climate or been tested against combined geological data.
We parameterize carbonate build-up in our model using reconstructions of crustal sedimentary rocks38,39. The overall trends in crustal rock area, volume and lithological proportions with age in the reconstruction by Ronov38 compare remarkably well with recent North American and global estimates from the Macrostrat geospatial database40,41. However, these databases do not track diffuse carbonate in siliciclastic sediments, which was probably more important in the past42. We also do not include carbonization of the seafloor43,44 in our carbonate reservoir.
The model results with an accumulating crustal carbonate reservoir, in combination with the previously described input parameters, are shown in Fig. 4. This addition makes a critical difference to all model processes by gradually increasing the rate of carbon cycling through the ocean–atmosphere–crust system over geological time, thus reducing the carbon fluxes on the early Earth when compared with our previous model in Fig. 3. Here lower CO2 degassing rates on the early Earth result in lower atmospheric CO2 and temperature and reduced silicate weathering rates and nutrient delivery. This leads to lower rates of organic carbon burial and lower atmospheric O2. Over long timescales, this also leads to less weathering of fossil organic carbon, further lowering CO2 and maintaining carbonate δ13C values close to zero.
We compare the model to the geological record to assess the reproduction of billion-year trends in multiple data sets—atmospheric and marine oxygen, atmospheric CO2, average surface temperature, carbon isotopes and sedimentary phosphorus abundance. The long timeframes result in greater data-model mismatch than is typical in studies of shorter timescales, however this multiproxy comparison remains a substantial challenge that has not previously been met. The billion-year δ13C trend is famously invariant45, and we consider our model output to be a good representation of this record, despite not producing large shorter-term excursions in the Paleoproterozoic and Phanerozoic, which are probably driven by mechanisms on shorter timescales than we consider. Similarly, the billion-year trend of the geological record of P in shales towards higher values28 is now broadly captured.
A ‘GOE’ occurs in the model between ~3.5 and 2 Ga when reduced gas input is overwhelmed by oxygen production, and the primary regulation of oxygen switches to oxidative weathering7,16. This is a wide timeframe but covers the GOE interval at ~2.4 to 2.2 Ga (ref. 2), which is consistent with the billion-year evolution of the Earth. Subsequently, atmospheric oxygen concentrations in the Proterozoic and early Phanerozoic are between ~0.1% PAL (present atmospheric level) and ~75% PAL, before the advent of land plants. With the rise of land plants O2 is regulated close to present day levels3,4. Oceanic oxygen rises follow those of the atmosphere with an anoxic ([O2] < 1 μmol l−1 in our model) deep ocean possible until the early Phanerozoic land plant colonization5.
The modelled anoxic fraction of shelf seafloor has values of 20–90% for the Proterozoic and early Phanerozoic, with 30–80% anoxic for the Archean (Supplementary Fig. 1). Independent modelling suggests that ~15–50% of the surface ocean demonstrated quantifiable oxygen concentrations during the Archean46, but these O2 levels were low, and the simple Phanerozoic-based approximation we use for calculating anoxia proabably underestimates the degree of anoxia for the Archean. We run a separate model where the anoxic fraction is fixed (Supplementary Fig. 2) to ensure this does not bias other model results. We do not simulate a ‘Neoproterozoic Oxygenation Event’ in either the atmosphere or ocean, but it is possible to have a stepwise shift in surface O2 levels or a series of oxygen pulses within our model uncertainty range. The range permits an approximate fivefold increase in atmospheric O2 during the Neoproterozoic and at least an order of magnitude increase in ocean oxygen content. However, much recent work is moving away from the idea of a stepwise change in Neoproterozoic oxygen levels5,20,47.
Modelled CO2 concentration falls within previously derived bounds29 and global average surface temperature is between ~0 °C and ~30 °C over most of Earth’s history. We produce very low surface temperatures in the Eoarchean due to crustal carbonate degassing tending to zero at this time. This is an interesting problem in itself and may simply be solved by the inclusion of other greenhouses gases, such as CH4 (ref. 33), but the Eoarchean in general is outside the scope of the analysis in this paper, given the uncertainty about early tectonics and metabolisms.
In Supplementary Information we explore the model ‘burial efficiency’ of organic carbon (Supplementary Fig. 4), denoted here as the fraction of export production that is ultimately buried. We generally predicted this to be higher than present during the Precambrian due to lower O2 levels and restricted respiration (Supplementary Fig. 4). Altering the model respiration rates allows us to explore changes in the burial efficiency. We find that a large range of marine oxygen levels is possible in this way (following Zhao et al.48), but the atmospheric oxygen levels are much less affected because high burial efficiencies remove more phosphorus and, therefore, act to lower export production, buffering against the increased carbon burial (Supplementary Fig. 5). We do not impose an accumulation of organic carbon in the crust or track the size of the buried organic carbon reservoir. In Supplementary Figs. 6 and 7, we plot organic carbon burial and weathering fluxes and show that our model suggests a rise in crustal organic carbon over time. Recycling of organic carbon to the surface consumes O2, so the build-up of organic carbon slightly counteracts the build-up of carbonates in this way. We also consider what happens in the model if we prescribe an an empty crustal carbonate reservoir that does not accumulate over time (Supplementary Fig. 9). In line with the results shown in Figs. 3 and 4, the model with no carbonate accumulation maintains low degassing rates, low surface temperature and very low oxygen levels, which is a poor match to the geological record.
We have chosen to neglect other previously discussed mechanisms in our modelling, and we defend those assumptions here. First, the process of hydrogen escape may have been vital in driving the GOE by changing the redox balance of Earth’s surface15. However, after the GOE, the ozone layer would have greatly inhibited this process, so it should make little difference during most of the Proterozoic and the Phanerozoic and cannot drive progressive oxygenation in the way carbonate build-up can. Nevertheless, including this within the model may change the dynamics of the GOE. Second, input of phosphorus from seafloor weathering is not considered in the model runs shown here. While P is released from basalt during submarine weathering in both oxic and anoxic environments48, modern day oxic hydrothermal systems constitute an overall sink for P due to combination with iron or carbonate minerals28. It is unclear if anoxic hydrothermal systems are net producers or removers of P, especially as P drawdown has been widely documented in combination with iron minerals in anoxic settings49. Given this uncertainty, we model seafloor weathering as neither a source or sink of P in the manuscript, and we experiment instead with adding a maximum P flux from seafloor weathering in Supplementary Information (Supplementary Fig. 8), showing that this addition does not invalidate our conclusions. Finally, at the present day, anoxygenic photosynthesis contributes approximately 0.17% towards total productivity, but this may have been more important in the deep past50. We do not include the process here as it is generally believed that oxygenic photosynthesis had evolved before the GOE34, but future work might uncover interesting dynamics associated with anoxygenic photosynthesis51. Finally, aside from the evolution of plants, we do not consider potential evolutionary mechanisms that may have altered the relationship between atmospheric CO2, nutrient inputs and carbon burial. We assume a phosphate-limited photosynthetic biosphere throughout the entire model run. This is in line with most global biogeochemical models for these timeframes7,9,16,49, but we hope that this work can contribute to subsequent investigation of alternative ideas. Clearly, without oxygenic photosynthesis, atmospheric O2 would have remained low in the Hadean even under high nutrient inputs.
Implications for Earth’s history
To summarize, we have constructed a self-consistent long-term model of the evolution of Earth’s carbon, oxygen and phosphorus cycles, which is capable of reproducing the broad observed changes in atmosphere and ocean O2 levels, atmospheric CO2, carbonate carbon isotopes, global average surface temperature and phosphorus burial rates over Earth’s history. This has not been done before, and by conducting this analysis, we have discovered that a critical missing component in models of the long-term Earth system is the build-up of carbonate minerals in Earth’s crust, which results in increasing rates of carbon recycling over billion-year timescales. An increasing rate of carbon recycling resolves a problematic issue with quantitative reconstruction of Earth’s key biogeochemical cycles over deep time, and it allows for constantly increasing rates of nutrient delivery from weathering, as well as a broadly static input rate of CO2 into the surface system, despite a cooling mantle.
According to our numerical work, complete oxygenation of the Earth’s surface was inevitable as soon as recycling of carbon was established, and oxygenic photosynthesis evolved. Continual degassing of the mantle CO2 and deposition of carbonates has resulted in ever-increasing rates of carbon and nutrient cycling between the hydrosphere and crust22, gradually increasing O2 levels in the atmosphere and oceans. The observed step-change at the GOE is not clearly constrained in time by our work but must occur once the O2 sources overwhelm sinks. We do not predict a distinct Neoproterozoic oxygenation, but the sporadic oxygenation observed in the geochemical record20 and in independent modelling studies6 is clearly possible within this framework, and even a relatively large step-change is possible within our model uncertainty envelope. The evolution of land plants acts to increase O2 levels in our model. However, it appears that the continual burial and recycling of carbonates may have eventually led to a high-oxygen world without them.
This work has both positive and negative implications for the likelihood of aerobic, complex life existing on other worlds. On one side, we can create an oxygenated world in our model without needing a succession of specific tectonic or biological events to do so, meaning that one might expect more photosynthetic Earth-like planets, with an atmosphere, ocean and active crustal recycling, to be oxygen-rich. However, the long timeframe of carbonate build-up on Earth implies that an oxygen-dependent biosphere could have been stymied on a similar sized rocky planet until billions of years after planetary formation, thus it may be more probable that intelligence is restricted to older worlds or those with styles of crustal recycling permissive to more rapid build-up of crustal carbon inventories.
Methods
The model developed here comprises the carbon, oxygen and phosphorus cycles across a five-box ocean and atmosphere system. The organic portion of this model is based on the model presented in Alcott et al.7, while the inorganic carbon cycle is predominantly based on the COPSE family of models19,20. The framework of Alcott et al.7 is retained with a four-box ocean and one-box atmosphere structure. The addition of the inorganic carbon cycle allows for simulation of atmospheric CO2 concentrations, global average surface temperature and dynamic weathering fluxes for silicates, carbonates and phosphorus and fossil organic matter. This model is forced by a small set of key geological processes and tested by 1,000 Monte-Carlo simulations, with the maximum and minimum values defined by the geological record. The parameters varied include reduced gas flux22, crustal carbonate carbon build-up38,39, fraction of exposed landmass26, anoxic sediment P recycling rate (denoted by Corg:Porg (ref. 27)) and land plant weathering enhancement19 (Fig. 1). The full model description and equations can be found in Supplementary Information, and the code can be downloaded at ref. 58.
Data availability
Model data can be downloaded at GitHub (https://github.com/lalcott/d13Ctemp_2023) (ref. 58).
Code availability
Model code can be downloaded at GitHub (https://github.com/lalcott/d13Ctemp_2023) (ref. 58).
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Acknowledgements
L.J.A.’s contribution was funded by a Hutchinson Environmental Postdoctoral Fellowship. C.W. acknowledges funding from the NOMIS Foundation and the Leverhulme Centre for Life in the Universe. N.J.P. acknowledges support from the Alternative Earths NASA ICAR award. B.J.W.M. acknowledges support from UKRI project NE/X011208/1.
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L.J.A. and B.J.W.M. designed the research and conducted the modelling. All authors contributed to writing and reviewing the manuscript.
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Alcott, L.J., Walton, C., Planavsky, N.J. et al. Crustal carbonate build-up as a driver for Earth’s oxygenation. Nat. Geosci. 17, 458–464 (2024). https://doi.org/10.1038/s41561-024-01417-1
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DOI: https://doi.org/10.1038/s41561-024-01417-1