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A coupled model of episodic warming, oxidation and geochemical transitions on early Mars

Abstract

Reconciling the geology of Mars with models of atmospheric evolution remains a major challenge. Martian geology is characterized by past evidence for episodic surface liquid water, and geochemistry indicating a slow and intermittent transition from wetter to drier and more oxidizing surface conditions. Here we present a model that incorporates randomized injection of reducing greenhouse gases and oxidation due to hydrogen escape to investigate the conditions responsible for these diverse observations. We find that Mars could have transitioned repeatedly from reducing (hydrogen-rich) to oxidizing (oxygen-rich) atmospheric conditions in its early history. Our model predicts a generally cold early Mars, with mean annual temperatures below 240 K. If peak reducing-gas release rates and background carbon dioxide levels are high enough, it nonetheless exhibits episodic warm intervals sufficient to degrade crater walls, form valley networks and create other fluvial/lacustrine features. Our model also predicts transient build-up of atmospheric oxygen, which can help explain the occurrence of oxidized mineral species such as manganese oxides at Gale Crater. We suggest that the apparent Noachian–Hesperian transition from phyllosilicate deposition to sulfate deposition around 3.5 billion years ago can be explained as a combined outcome of increasing planetary oxidation, decreasing groundwater availability and a waning bolide impactor flux, which dramatically slowed the remobilization and thermochemical destruction of surface sulfates. Ultimately, rapid and repeated variations in Mars’s early climate and surface chemistry would have presented both challenges and opportunities for any emergent microbial life.

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Fig. 1: Observations versus atmospheric evolution model predictions over Mars’s history.
Fig. 2: Integrated duration of warm intervals as a function of hydrogen fluxes into the Martian atmosphere.
Fig. 3: Thermochemical sulfate reduction on Mars in the Noachian period.
Fig. 4: Manganese oxidation on Mars during a late-stage brief warming event.

Data availability

The input data to the model used to produce the plots in this paper are available on GitHub at https://github.com/wordsworthgroup/mars_redox_2021, https://github.com/wordsworthgroup/mars_redox_2021/tree/main/PCM_LBL and https://github.com/wordsworthgroup/crustal-heat, with the exception of the HITRAN data used by the line-by-line radiative–convective model and the one-dimensional regolith heating data, which are available on Zenodo at https://doi.org/10.5281/zenodo.4458673.

Code availability

The stochastic atmospheric evolution model, along with other scripts to reproduce plots in the paper, is available open source on GitHub at https://github.com/wordsworthgroup/mars_redox_2021. The line-by-line radiative–convective model used to produce the climate parameterization (PCM_LBL) is available open source on GitHub at https://github.com/wordsworthgroup/mars_redox_2021/PCM_LBL. The regolith thermal evolution model is available open source on GitHub at https://github.com/wordsworthgroup/crustal-heat. The Geochemist’s Workbench is proprietary software available at https://www.gwb.com/.

References

  1. 1.

    Carr, M. H. & Head, J. W. Geologic history of Mars. Earth Planet. Sci. Lett. 294, 185–203 (2010).

    Article  Google Scholar 

  2. 2.

    Grotzinger, J. P. et al. A habitable fluvio-lacustrine environment at Yellowknife Bay, Gale Crater, Mars. Science 343, 1242777 (2014).

    Article  Google Scholar 

  3. 3.

    Halevy, I., Zuber, M. T. & Schrag, D. P. A sulfur dioxide climate feedback on early Mars. Science 318, 1903–1907 (2007).

    Article  Google Scholar 

  4. 4.

    Tian, F. et al. Photochemical and climate consequences of sulfur outgassing on early Mars. Earth Planet. Sci. Lett. 295, 412–418 (2010).

    Article  Google Scholar 

  5. 5.

    Toon, O. B., Segura, T. & Zahnle, K. The formation of martian river valleys by impacts. Annu. Rev. Earth Planet. Sci. 38, 303–322 (2010).

    Article  Google Scholar 

  6. 6.

    Forget, F. et al. 3D modelling of the early martian climate under a denser CO2 atmosphere: temperatures and CO2 ice clouds. Icarus 222, 81–99 (2013).

    Article  Google Scholar 

  7. 7.

    Haberle, R. M., Catling, D. C., Carr, M. H. & Zahnle, K. J. in The Atmosphere and Climate of Mars (eds Haberle, R. M. et al.) Ch. 17 (Cambridge Univ. Press, 2017).

  8. 8.

    Ramirez, R. M. & Craddock, R. A. The geological and climatological case for a warmer and wetter early Mars. Nat. Geosci. 11, 230–237 (2018).

    Article  Google Scholar 

  9. 9.

    Hoke, M. R. T., Hynek, B. M. & Tucker, G. E. Formation timescales of large martian valley networks. Earth Planet. Sci. Lett. 312, 1–12 (2011).

    Article  Google Scholar 

  10. 10.

    Bishop, J. L. et al. Surface clay formation during short-term warmer and wetter conditions on a largely cold ancient Mars. Nat. Astron. 2, 206–213 (2018).

    Article  Google Scholar 

  11. 11.

    Lapotre, M. G. & Ielpi, A. The pace of fluvial meanders on Mars and implications for the western delta deposits of Jezero Crater. AGU Adv. 1, e2019AV000141 (2020).

  12. 12.

    Olsen, A. A. & Rimstidt, J. D. Using a mineral lifetime diagram to evaluate the persistence of olivine on Mars. Am. Mineral. 92, 598–602 (2007).

    Article  Google Scholar 

  13. 13.

    Ehlmann, B. L. & Edwards, C. S. Mineralogy of the martian surface. Annu. Rev. Earth Planet. Sci. 42, 291–315 (2014).

    Article  Google Scholar 

  14. 14.

    Niles, P. B. et al. Geochemistry of carbonates on Mars: implications for climate history and nature of aqueous environments. Space Sci. Rev. 174, 301–328 (2013).

    Article  Google Scholar 

  15. 15.

    Ehlmann, B. L. et al. Subsurface water and clay mineral formation during the early history of Mars. Nature 479, 53–60 (2011).

    Article  Google Scholar 

  16. 16.

    Bibring, J.-P. et al. Global mineralogical and aqueous mars history derived from OMEGA/Mars Express data. Science 312, 400–404 (2006).

    Article  Google Scholar 

  17. 17.

    Wadhwa, M. Redox state of Mars’ upper mantle and crust from Eu anomalies in shergottite pyroxenes. Science 291, 1527–1530 (2001).

    Article  Google Scholar 

  18. 18.

    Ramirez, R. M. et al. Warming early Mars with CO2 and H2. Nat. Geosci. 7, 59–63 (2014).

    Article  Google Scholar 

  19. 19.

    Wordsworth, R. et al. Transient reducing greenhouse warming on early Mars. Geophys. Res. Lett. 44, 665–671 (2017).

    Article  Google Scholar 

  20. 20.

    Lorand, J.-P. et al. The sulfur budget and sulfur isotopic composition of Martian regolith breccia NWA 7533. Meteorit. Planet. Sci. 55, 2097–2116 (2020).

    Article  Google Scholar 

  21. 21.

    Hurowitz, J. A. et al. Redox stratification of an ancient lake in Gale Crater, Mars. Science 356, eaah6849 (2017).

    Article  Google Scholar 

  22. 22.

    Lanza, N. L. et al. Oxidation of manganese in an ancient aquifer, Kimberley formation, Gale Crater, Mars. Geophys. Res. Lett. 43, 7398–7407 (2016).

    Article  Google Scholar 

  23. 23.

    Hurowitz, J. A., Fischer, W. W., Tosca, N. J. & Milliken, R. E. Origin of acidic surface waters and the evolution of atmospheric chemistry on early Mars. Nat. Geosci. 3, 323–326 (2010).

    Article  Google Scholar 

  24. 24.

    Liu, W. et al. Anoxic photogeochemical oxidation of manganese carbonate yields manganese oxide. Proc. Natl Acad. Sci. USA 117, 22698–22704 (2020).

    Article  Google Scholar 

  25. 25.

    Haberle, R. M., Zahnle, K. J., Barlow, N. G. & Steakley, K. Impact degassing of H2 on early Mars and its effect on the climate system. Geophys. Res. Lett. 46, 13355–13362 (2019).

    Article  Google Scholar 

  26. 26.

    Chassefière, E., Lasue, J., Langlais, B. & Quesnel, Y. Early Mars serpentinization-derived CH4 reservoirs, H2-induced warming and paleopressure evolution. Meteorit. Planet. Sci. 51, 2234–2245 (2016).

    Article  Google Scholar 

  27. 27.

    Tosca, N. J., Ahmed, I. A. M., Tutolo, B. M., Ashpitel, A. & Hurowitz, J. A. Magnetite authigenesis and the warming of early Mars. Nat. Geosci. 11, 635–639 (2018).

    Article  Google Scholar 

  28. 28.

    Jakosky, B. M. et al. Loss of the martian atmosphere to space: present-day loss rates determined from MAVEN observations and integrated loss through time. Icarus 351, 146–157 (2018).

    Article  Google Scholar 

  29. 29.

    Turbet, M., Boulet, C. & Karman, T. Measurements and semi-empirical calculations of CO2 + CH4 and CO2 + H2 collision-induced absorption across a wide range of wavelengths and temperatures. Application for the prediction of early Mars surface temperature. Icarus 346, 113762 (2020).

    Article  Google Scholar 

  30. 30.

    Mangold, N., Adeli, S., Conway, S., Ansan, V. & Langlais, B. A chronology of early Mars climatic evolution from impact crater degradation. J. Geophys. Res. Planets 117, E04003 (2012).

    Article  Google Scholar 

  31. 31.

    Fassett, C. I. & Head, J. W. Sequence and timing of conditions on early Mars. Icarus 211, 1204–1214 (2008).

    Article  Google Scholar 

  32. 32.

    Wordsworth, R. et al. Global modelling of the early martian climate under a denser CO2 atmosphere: water cycle and ice evolution. Icarus 222, 1–19 (2013).

    Article  Google Scholar 

  33. 33.

    Osterloo, M. M., Anderson, F. S., Hamilton, V. E. & Hynek, B. M. Geologic context of proposed chloride-bearing materials on Mars. J. Geophys. Res. Planets 115, E10012 (2010).

    Article  Google Scholar 

  34. 34.

    Hynek, B. M., Osterloo, M. K. & Kierein-Young, K. S. Late-stage formation of martian chloride salts through ponding and evaporation. Geology 43, 787–790 (2015).

    Article  Google Scholar 

  35. 35.

    McLennan, S. M. et al. Provenance and diagenesis of the evaporite-bearing Burns formation, Meridiani Planum, Mars. Earth Planet. Sci. Lett. 240, 95–121 (2005).

    Article  Google Scholar 

  36. 36.

    Halevy, I. & Head, J. W. Episodic warming of early Mars by punctuated volcanism. Nat. Geosci. 7, 865–868 (2014).

    Article  Google Scholar 

  37. 37.

    Gaillard, F., Michalski, J., Berger, G., McLennan, S. M. & Scaillet, B. Geochemical reservoirs and timing of sulfur cycling on Mars. Space Sci. Rev. 174, 251–300 (2013).

    Article  Google Scholar 

  38. 38.

    Wade, J., Dyck, B., Palin, R. M., Moore, J. D. P. & Smye, A. J. The divergent fates of primitive hydrospheric water on Earth and Mars. Nature 552, 391–394 (2017).

    Article  Google Scholar 

  39. 39.

    Milliken, R. E., Fischer, W. W. & Hurowitz, J. A. Missing salts on early Mars. Geophys. Res. Lett. 36, L11202 (2009).

    Article  Google Scholar 

  40. 40.

    Zolotov, M. Y. & Mironenko, M. V. Chemical models for martian weathering profiles: insights into formation of layered phyllosilicate and sulfate deposits. Icarus 275, 203–220 (2016).

    Article  Google Scholar 

  41. 41.

    Sholes, S. F., Smith, M. L., Claire, M. W., Zahnle, K. J. & Catling, D. C. Anoxic atmospheres on Mars driven by volcanism: implications for past environments and life. Icarus 290, 46–62 (2017).

    Article  Google Scholar 

  42. 42.

    Segura, T. L., Toon, O. B., Colaprete, A. & Zahnle, K. Environmental effects of large impacts on Mars. Science 298, 1977–1980 (2002).

    Article  Google Scholar 

  43. 43.

    Steakley, K., Murphy, J., Kahre, M., Haberle, R. & Kling, A. Testing the impact heating hypothesis for early Mars with a 3-D global climate model. Icarus 330, 169–188 (2019).

    Article  Google Scholar 

  44. 44.

    Palumbo, A. M. & Head, J. W. Impact cratering as a cause of climate change, surface alteration, and resurfacing during the early history of Mars. Meteorit. Planet. Sci. 54, 687–725 (2018).

    Article  Google Scholar 

  45. 45.

    Turbet, M. et al. The environmental effects of very large bolide impacts on early Mars explored with a hierarchy of numerical models. Meteorit. Planet. Sci. 54, 687–725 (2018).

    Google Scholar 

  46. 46.

    Mitra, K., Moreland, E. L. & Catalano, J. G. Capacity of chlorate to oxidize ferrous iron: implications for iron oxide formation on Mars. Minerals 10, 729 (2020).

    Article  Google Scholar 

  47. 47.

    Fegley, B., Zolotov, M. Y. & Lodders, K. The oxidation state of the lower atmosphere and surface of Venus. Icarus 125, 416–439 (1997).

    Article  Google Scholar 

  48. 48.

    Wordsworth, R. D. Atmospheric nitrogen evolution on Earth and Venus. Earth Planet. Sci. Lett. 447, 103–111 (2016).

    Article  Google Scholar 

  49. 49.

    Niemann, H. B. et al. The abundances of constituents of Titanas atmosphere from the GCMS instrument on the Huygens probe. Nature 438, 779–784 (2005).

    Article  Google Scholar 

  50. 50.

    Wordsworth, R., Schaefer, L. & Fischer, R. Redox evolution via gravitational differentiation on low-mass planets: implications for abiotic oxygen, water loss, and habitability. Astron. J. 155, 195 (2018).

    Article  Google Scholar 

  51. 51.

    Tremaine, S. & Dones, L. On the statistical distribution of massive impactors. Icarus 106, 335–341 (1993).

    Article  Google Scholar 

  52. 52.

    Werner, S. C. & Tanaka, K. L. Redefinition of the crater-density and absolute-age boundaries for the chronostratigraphic system of Mars. Icarus 215, 603–607 (2011).

    Article  Google Scholar 

  53. 53.

    Mason, B. G., Pyle, D. M. & Oppenheimer, C. The size and frequency of the largest explosive eruptions on Earth. Bull. Volcanol. 66, 735–748 (2004).

    Article  Google Scholar 

  54. 54.

    Cannavò, F. & Nunnari, G. On a possible unified scaling law for volcanic eruption durations. Sci. Rep. 6, 22289 (2016).

    Article  Google Scholar 

  55. 55.

    Grott, M., Morschhauser, A., Breuer, D. & Hauber, E. Volcanic outgassing of CO2 and H2O on Mars. Earth Planet. Sci. Lett. 308, 391–400 (2011).

    Article  Google Scholar 

  56. 56.

    Sleep, N. H. & Zahnle, K. Carbon dioxide cycling and implications for climate on ancient Earth. J. Geophys. Res. 106, 1373–1400 (2001).

    Article  Google Scholar 

  57. 57.

    Papale, P. Global time-size distribution of volcanic eruptions on Earth. Sci. Rep. 8, 6838 (2018).

    Article  Google Scholar 

  58. 58.

    Zahnle, K., Pollack, J. B., Grinspoon, D. & Dones, L. Impact-generated atmospheres over Titan, Ganymede, and Callisto. Icarus 95, 1–23 (1992).

    Article  Google Scholar 

  59. 59.

    McCubbin, F. M. et al. Hydrous melting of the martian mantle produced both depleted and enriched shergottites. Geology 40, 683–686 (2012).

    Article  Google Scholar 

  60. 60.

    Herd, C. D. The oxygen fugacity of olivine-phyric martian basalts and the components within the mantle and crust of Mars. Meteorit. Planet. Sci. 38, 1793–1805 (2003).

    Article  Google Scholar 

  61. 61.

    Phillips, R. J. et al. Ancient geodynamics and global-scale hydrology on Mars. Science 291, 2587–2591 (2001).

    Article  Google Scholar 

  62. 62.

    Chassefière, E., Langlais, B., Quesnel, Y. & Leblanc, F. The fate of early Mars’ lost water: the role of serpentinization. J. Geophys. Res. Planets 118, 1123–1134 (2013).

    Article  Google Scholar 

  63. 63.

    Batalha, N., Domagal-Goldman, S. D., Ramirez, R. & Kasting, J. F. Testing the early Mars H2–CO2 greenhouse hypothesis with a 1-D photochemical model. Icarus 258, 337–349 (2015).

    Article  Google Scholar 

  64. 64.

    Tarnas, J. D. et al. Radiolytic H2 production on Noachian Mars: implications for habitability and atmospheric warming. Earth Planet. Sci. Lett. 502, 133–145 (2018).

    Article  Google Scholar 

  65. 65.

    Etiope, G., Ehlmann, B. L. & Schoell, M. Low temperature production and exhalation of methane from serpentinized rocks on Earth: a potential analog for methane production on Mars. Icarus 224, 276–285 (2013).

    Article  Google Scholar 

  66. 66.

    Lasue, J., Quesnel, Y., Langlais, B. & Chassefière, E. Methane storage capacity of the early martian cryosphere. Icarus 260, 205–214 (2015).

    Article  Google Scholar 

  67. 67.

    Chamberlain, J. W. & Hunten, D. M. Theory of Planetary Atmospheres. An Introduction to Their Physics and Chemistry (Academic Press, 1987).

  68. 68.

    Heavens, N. et al. Hydrogen escape from Mars enhanced by deep convection in dust storms. Nat. Astron. 2, 126–132 (2018).

    Article  Google Scholar 

  69. 69.

    Donahue, T. M. Evolution of water reservoirs on Mars from D/H ratios in the atmosphere and crust. Nature 374, 432–434 (1995).

    Article  Google Scholar 

  70. 70.

    Villanueva, G. L. et al. Strong water isotopic anomalies in the martian atmosphere: probing current and ancient reservoirs. Science 348, 218–221 (2015).

    Article  Google Scholar 

  71. 71.

    Heard, A. & Kite, E. S. A probabilistic case for a large missing carbon sink on Mars after 3.5 billion years ago. Earth Planet. Sci. Lett. 531, 116001 (2020).

    Article  Google Scholar 

  72. 72.

    Mahaffy, P. R. et al. The imprint of atmospheric evolution in the D/H of Hesperian clay minerals on Mars. Science 347, 412–414 (2015).

    Article  Google Scholar 

  73. 73.

    Lunine, J. I., Chambers, J., Morbidelli, A. & Leshin, L. A. The origin of water on Mars. Icarus 165, 1–8 (2003).

    Article  Google Scholar 

  74. 74.

    Kurokawa, H. et al. Evolution of water reservoirs on Mars: constraints from hydrogen isotopes in martian meteorites. Earth Planet. Sci. Lett. 394, 179–185 (2014).

    Article  Google Scholar 

  75. 75.

    Yung, Y. L. et al. HDO in the martian atmosphere: implications for the abundance of crustal water. Icarus 76, 146–159 (1988).

    Article  Google Scholar 

  76. 76.

    Krasnopolsky, V. A., Mumma, M. J. & Gladstone, G. R. Detection of atomic deuterium in the upper atmosphere of Mars. Science 280, 1576–1580 (1998).

    Article  Google Scholar 

  77. 77.

    Carr, M. H. & Head, J. W. Martian surface/near-surface water inventory: sources, sinks, and changes with time. Geophys. Res. Lett. 42, 726–732 (2015).

    Article  Google Scholar 

  78. 78.

    Brain, D. A. et al. The spatial distribution of planetary ion fluxes near Mars observed by MAVEN. Geophys. Res. Lett. 42, 9142–9148 (2015).

    Article  Google Scholar 

  79. 79.

    Lillis, R. J. et al. Characterizing atmospheric escape from Mars today and through time, with MAVEN. Space Sci. Rev. 195, 357–422 (2015).

    Article  Google Scholar 

  80. 80.

    Jakosky, B. M., Pepin, R. O., Johnson, R. E. & Fox, J. L. Mars atmospheric loss and isotopic fractionation by solar-wind-induced sputtering and photochemical escape. Icarus 111, 271–288 (1994).

    Article  Google Scholar 

  81. 81.

    Chassefière, E. & Leblanc, F. Mars atmospheric escape and evolution; interaction with the solar wind. Planet. Space Sci. 52, 1039–1058 (2004).

    Article  Google Scholar 

  82. 82.

    Lammer, H. et al. Outgassing history and escape of the martian atmosphere and water inventory. Space Sci. Rev. 174, 113–154 (2013).

    Article  Google Scholar 

  83. 83.

    Lillis, R. J. et al. Photochemical escape of oxygen from Mars: first results from MAVEN in situ data. J. Geophys. Res. Space Phys. 122, 3815–3836 (2017).

    Article  Google Scholar 

  84. 84.

    Jakosky, B. M. The CO2 inventory on Mars. Planet. Space Sci. 175, 52–59 (2019).

    Article  Google Scholar 

  85. 85.

    Kite, E. S., Williams, J.-P., Lucas, A. & Aharonson, O. Low palaeopressure of the martian atmosphere estimated from the size distribution of ancient craters. Nat. Geosci. 7, 335–339 (2014).

    Article  Google Scholar 

  86. 86.

    Hu, R., Kass, D. M., Ehlmann, B. L. & Yung, Y. L. Tracing the fate of carbon and the atmospheric evolution of Mars. Nat. Commun. 6, 10003 (2015).

    Article  Google Scholar 

  87. 87.

    Burns, R. G. & Fisher, D. S. Rates of oxidative weathering on the surface of Mars. J. Geophys. Res. Planets 98, 3365–3372 (1993).

    Article  Google Scholar 

  88. 88.

    Haberle, R. M. et al. On the possibility of liquid water on present-day Mars. J. Geophys. Res. Planets 106, 23317–23326 (2001).

    Article  Google Scholar 

  89. 89.

    McEwen, A. S. et al. Recurring slope lineae in equatorial regions of Mars. Nat. Geosci. 7, 53–58 (2014).

    Article  Google Scholar 

  90. 90.

    Huguenin, R. L. Photostimulated oxidation of magnetite: 1. Kinetics and alteration phase identification. J. Geophys. Res. 78, 8481–8493 (1973).

    Article  Google Scholar 

  91. 91.

    Wordsworth, R., Forget, F. & Eymet, V. Infrared collision-induced and far-line absorption in dense CO2 atmospheres. Icarus 210, 992–997 (2010).

    Article  Google Scholar 

  92. 92.

    Ding, F. & Wordsworth, R. D. A new line-by-line general circulation model for simulations of diverse planetary atmospheres: initial validation and application to the exoplanet GJ 1132b. Astrophys. J. 878, 117 (2019).

    Article  Google Scholar 

  93. 93.

    Gough, D. O. in Physics of Solar Variations (ed. Domingo, V.) 21–34 (Springer, 1981).

  94. 94.

    Minton, D. A. & Malhotra, R. Assessing the massive young Sun hypothesis to solve the warm young Earth puzzle. Astrophys. J. 660, 1700–1706 (2007).

    Article  Google Scholar 

  95. 95.

    Clifford, S. M. A model for the hydrologic and climatic behavior of water on Mars. J. Geophys. Res. 98, 10973–11016 (1993).

    Article  Google Scholar 

  96. 96.

    Hu, H. & Argyropoulos, S. A. Mathematical modelling of solidification and melting: a review. Model. Simul. Mater. Sci. Eng. 4, 371–396 (1996).

    Article  Google Scholar 

  97. 97.

    Truche, L. et al. Experimental reduction of aqueous sulphate by hydrogen under hydrothermal conditions: implication for the nuclear waste storage. Geochim. Cosmochim. Acta 73, 4824–4835 (2009).

    Article  Google Scholar 

  98. 98.

    Hem, J. D. Rates of manganese oxidation in aqueous systems. Geochim. Cosmochim. Acta 45, 1369–1374 (1981).

    Article  Google Scholar 

  99. 99.

    Morgan, J. J. Kinetics of reaction between O2 and Mn(ii) species in aqueous solutions. Geochim. Cosmochim. Acta 69, 35–48 (2005).

    Article  Google Scholar 

  100. 100.

    Linstrom, P. J. & Mallard, W. G. The NIST Chemistry WebBook: a chemical data resource on the internet. J. Chem. Eng. Data 46, 1059–1063 (2001).

    Article  Google Scholar 

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Acknowledgements

R.W. thanks D. Johnston, K. Loftus, Y. Sekine and K. Zahnle for discussions. We thank N. Lanza for helpful comments on an earlier version of the manuscript. Funding: R.W. and M.B. acknowledge funding from NSF CAREER award AST-1847120 and NASA/VPL grant UWSC10439. J.H. acknowledges support from the Simons Collaboration on the Origin of Life.

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R.W., A.H.K. and J.H. conceived the paper. M.B. performed the one-dimensional regolith heating calculations. K.S. performed the post-impact three-dimensional climate simulations. R.W. performed the rest of the modelling and wrote most of the manuscript. B.L.E. provided ideas and text on surface geochemical evolution, timing and the role of evaporitic versus thermochemical processes. J.W.H. provided input and background on planetary volcanism, impactor and fluvial/lacustrine processes, and geological evolution. All authors discussed the results and provided input on multiple draft versions of the manuscript.

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Correspondence to Robin Wordsworth.

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Peer review informationNature Geoscience thanks David Catling, Edwin Kite and Nicolas Mangold for their contribution to the peer review of this work. Primary Handling Editors: Tamara Goldin; Rebecca Neely

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Wordsworth, R., Knoll, A.H., Hurowitz, J. et al. A coupled model of episodic warming, oxidation and geochemical transitions on early Mars. Nat. Geosci. 14, 127–132 (2021). https://doi.org/10.1038/s41561-021-00701-8

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