Jarosite as an indicator of water-limited chemical weathering on Mars

Abstract

The Mars Exploration Rover Opportunity identified the ferric sulphate mineral jarosite and possible relicts of gypsum at the Meridiani Planum landing site1. On Earth, jarosite has been found to form in acid mine drainage environments, during the oxidation of sulphide minerals2, and during alteration of volcanic rocks by acidic, sulphur-rich fluids near volcanic vents3. Jarosite formation is thus thought to require a wet, oxidizing and acidic environment. But jarosite on Earth only persists over geologically relevant time periods in arid environments because it rapidly decomposes to produce ferric oxyhydroxides in more humid climates4. Here we present equilibrium thermodynamic reaction-path simulations that constrain the range of possible conditions under which such aqueous alteration phases are likely to have formed on Mars. These calculations simulate the chemical weathering of basalt at relevant martian conditions. We conclude that the presence of jarosite combined with residual basalt at Meridiani Planum indicates that the alteration process did not proceed to completion, and that following jarosite formation, arid conditions must have prevailed.

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Figure 1: Predicted alteration minerals, reported as weight per cent of alteration assemblage at a water:rock ratio of 1:1.
Figure 2: Eh–pH phase diagram of the Fe-S-Ca-Na-HCO3-H2O system at 298 K.

References

  1. 1

    Morris, R. et al. A first look at the mineralogy and geochemistry of the MER-B landing site in Meridiani Planum. Lunar Planet. Sci. Conf. XXXV, abstract 2179 (2004)

  2. 2

    Herbert, R. Properties of goethite and jarosite precipitated from acidic groundwater, Darlarna, Sweden. Clays Clay Miner. 45, 261–273 (1997)

  3. 3

    Fulignati, P., Sbrana, A., Luperini, W. & Greco, V. Formation of rock coatings induced by the acid fumarole plume of the passively degassing volcano of la Fossa (Volcano Island, Italy). J. Volcanol. Geotherm. Res. 115, 397–410 (2002)

  4. 4

    Langmuir, D. Aqueous Environmental Geochemsitry (Prentice Hall, Upper Saddle River, New Jersey, 1996)

  5. 5

    Gooding, J. Soil mineralogy and chemistry on Mars: possible clues from salts and clays in SNC meteorites. Icarus 99, 28–41 (1992)

  6. 6

    Bridges, J. et al. Alteration assemblages in Martian meteorites: implications for near-surface processes. Space Sci. Rev. 96, 365–392 (2001)

  7. 7

    Clark, B. & Van Hart, D. The salts of Mars. Icarus 45, 370–378 (1981)

  8. 8

    Wanke, H. et al. Chemical composition of rocks and soils at the Pathfinder site. Space Sci. Rev. 96, 317–330 (2001)

  9. 9

    Clark, B. & Baird, A. Is the Martian lithosphere sulphur rich? J. Geophys. Res. 84, 8395–8403 (1979)

  10. 10

    Settle, M. Formation and deposition of volcanic sulphate aerosols on Mars. J. Geophys. Res. 84, 8343–8354 (1979)

  11. 11

    Banin, A., Han, F. X., Kan, I. & Cicelsky, A. Acidic volatiles and the Mars soil. J. Geophys. Res. 102, 13341–13356 (1997)

  12. 12

    Catling, D. A chemical model for evaporites on early Mars: possible sedimentary tracers of the early climate and implications for exploration. J. Geophys. Res. 104, 16453–16469 (1999)

  13. 13

    Farquhar, J., Saravino, J., Jackson, T. & Thiemens, M. Evidence of atmospheric sulphur in the Martian regolith from sulphur isotopes in meteorites. Nature 404, 50–52 (2000)

  14. 14

    Marion, G., Catling, D. & Kargel, J. Modelling aqueous ferrous iron chemistry at low temperatures with application to Mars. Geochim. Cosmochim. Acta 67, 4251–4266 (2003)

  15. 15

    Clark, B. Geochemical components in Martian soil. Geochim. Cosmochim. Acta 57, 4575–4581 (1993)

  16. 16

    Gooding, J. Chemical weathering on Mars. Icarus 33, 483–513 (1978)

  17. 17

    Pollack, J., Kasting, J., Richardson, S. & Poliakoff, K. The case for a wet, warm climate on early Mars. Icarus 71, 203–224 (1987)

  18. 18

    Bethke, C. Geochemical Reaction Modelling: Concepts and Applications (Oxford Univ. Press, New York, 1996)

  19. 19

    Rosenbauer, R., Bischoff, J. & Radtke, A. Hydrothermal alteration of graywacke and basalt by 4 molal NaCl. Econ. Geol. 78, 1701–1710 (1983)

  20. 20

    Owen, T. in Mars (eds Kieffer, H., Jakosky, B., Snyder, C. & Matthews, M.) 818–834 (Univ. Arizona Press, Tucson, 1992)

  21. 21

    Linke, W. Solubilities of Inorganic and Metal Organic Compounds Vol. I, 3rd edn (Am. Chem. Soc., Washington DC, 1958)

  22. 22

    Barth, C. The Photochemistry of Atmospheres 337–392 (Academic, New York, 1985)

  23. 23

    Hemley, J. J., Cygan, G. & d'Angelo, W. Effect of pressure on ore mineral solubilities under hydrothermal conditions. Geology 14, 377–379 (1986)

  24. 24

    Kraft, M., Michalski, J. & Sharp, T. Effects of pure silica coatings on thermal emission spectra of basaltic rocks: Considerations for Martian surface mineralogy. Geophys. Res. Lett. 30, doi:10.1029/2003GL018848 (2003)

  25. 25

    Ziegler, K. et al. Halloysite as kinetically controlled end product of arid-zone basalt weathering. Chem. Geol. 202, 461–478 (2003)

  26. 26

    Fieldes, M. & Claridge, G. in Soil Components Vol. 2 Inorganic ComponentsM (ed. Gieseking, J.) 351–393 (Springer, New York, 1975)

  27. 27

    Jakosky, B., Henderson, B. & Mellon, M. Chaotic obliquity and the nature of the martian climate. J. Geophys. Res. 100, 1579–1584 (1995)

  28. 28

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

  29. 29

    Chyba, C., Owen, T. & Ip, W. in Hazards Due to Comets and Asteroids (ed. Gehrels, T.) 9–58 (Univ. Arizona Press, Tucson, 1994)

  30. 30

    McSween, H. Jr & Keil, K. Mixing relationships in the Martian regolith and the composition of globally homogeneous dust. Geochim. Cosmochim. Acta 64, 2155–2166 (2000)

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Acknowledgements

M.E.E.M. thanks J. Jerden for assistance in the early stages of the project and A. Madden for discussions. M.E.E.M. and R.J.B. thank H. McSween for comments on early interpretations. This project was partially funded by a grant to R.J.B. from the NSF.Authors' contributions M.E.E.M. conducted the modelling with advice from R.J.B. and J.D.R. Interpretations were a result of collaborations between M.E.E.M., R.J.B. and J.D.R. The manuscript was written by M.E.E.M. with input from R.J.B. and J.D.R.

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Correspondence to M. E. Elwood Madden.

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Elwood Madden, M., Bodnar, R. & Rimstidt, J. Jarosite as an indicator of water-limited chemical weathering on Mars. Nature 431, 821–823 (2004). https://doi.org/10.1038/nature02971

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