Geological evidence for solid-state convection in Europa's ice shell (original) (raw)
- Letter
- Published: 22 January 1998
- J. W. Head1,
- R. Greeley2,
- R. J. Sullivan2,
- C. Pilcher3,
- G. Schubert4,
- W. B. Moore4,
- M. H. Carr5,
- J. M. Moore6,
- M. J. S. Belton7 &
- …
- D. L. Goldsby1
Nature volume 391, pages 365–368 (1998)Cite this article
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Abstract
The ice-rich surface of the jovian satellite Europa is sparsely cratered, suggesting that this moon might be geologically active today1. Moreover, models of the satellite's interior indicate that tidal interactions with Jupiter might produce enough heat to maintain a subsurface liquid water layer2,3,4,5. But the mechanisms of interior heat loss and resurfacing are currently unclear, as is the question of whether Europa has (or had at one time) a liquid water ocean6,7. Here we report on the morphology and geological interpretation of distinct surface features—pits, domes and spots—discovered in high-resolution images of Europa obtained by the Galileo spacecraft. The features are interpreted as the surface manifestation of diapirs, relatively warm localized ice masses that have risen buoyantly through the subsurface. We find that the formation of the features can be explained by thermally induced solid-state convection within an ice shell, possibly overlying a liquid water layer. Our results are consistent with the possibility that Europa has a liquid water ocean beneath a surface layer of ice, but further tests and observations are needed to demonstrate this conclusively.
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References
- Carr, M. H.et al. Evidence for a subsurface ocean on Europa. Nature 391, 363–365 (1998).
Article ADS CAS Google Scholar - Cassen, P. M., Peale, S. J. & Reynolds, R. T. in Satellites of Jupiter (ed. Morrison, D.) 93–128 (Univ. Arizona Press, Tucson, 1982).
Google Scholar - Squyres, S. W., Reynolds, R. T., Cassen, P. & Peale, S. J. Liquid water and active resurfacing on Europa. Nature 301, 225–226 (1983).
Article ADS CAS Google Scholar - Ross, M. & Schubert, G. Tidal heating in an internal ocean model of Europa. Nature 325, 133–134 (1987).
Article ADS Google Scholar - Ojakangas, G. W. & Stevensonn, D. J. Thermal state of an ice shell on Europa. Icarus 81, 220–241 (1989).
Article ADS CAS Google Scholar - Lucchitta, B. K. & Soderblomm, L. A. in Satellites of Jupiter (ed. Morrison, D.) 521–555 (Univ. Arizona Press, Tucson, 1982).
Google Scholar - Carr, M. H. et al. The Galileo Imaging Team plan for observing the satellites of Jupiter. J. Geophys. Res. 100, 18935–18955 (1995).
Article ADS Google Scholar - Greeley, R.et al. Europa triple bands: Galileo images. Lunar Planet. Sci. Conf. Abstr. 28, 455–456 (1997).
ADS Google Scholar - Kargel, J. S. Brine volcanism and the interior structures of asteroids and icy satellites. Icarus 94, 368–390 (1991).
Article ADS CAS Google Scholar - Jenyon, M. K. Salt Tectonics (Elsevier, New York, 1986).
Google Scholar - O'Brien, G. D. Mem. Am. Assoc. Petrol. Geol. 8, 1–9 (1968).
Google Scholar - Schenk, P. & Jackson, M. P. A. Diapirism on Triton: A record of crustal layering and instability. Geology 21, 299–302 (1993).
Article ADS Google Scholar - Schubert, G., Spohn, T. & Reynoldss, R. T. in Satellites (eds Burns, J. A. & Matthews, M. S.) 224–292 (Univ. Arizona Press, Tucson, 1986).
Google Scholar - Reynolds, R. T. & Cassen, P. M. On the internal structure of the major satellites of the outer planets. Geophys. Res. Lett. 6, 121–124 (1979).
Article ADS CAS Google Scholar - Goldsby, D. L. & Kohlstedt, D. L. Flow of ice I by dislocation, grain boundary sliding, and diffusion processes. Lunar Planet. Sci. Conf. Abstr. 28, 429–430 (1997).
ADS Google Scholar - Goldsby, D. L. & Kohlstedt, D. L. Grain boundary sliding in fine-grained ice I. Scripta Mat. 37, 1399–1406 (1997).
Article CAS Google Scholar - Stengel, K. C., Oliver, D. S. & Booker, J. R. Onset of convection in a variable viscosity fluid. J. Fluid Mech. 120, 411–431 (1982).
Article ADS CAS Google Scholar - Mueller, S. & McKinnon, W. B. Three-layered models of Ganymede and Callisto: Compositions, structures, and aspects of evolution. Icarus 76, 437–464 (1988).
Article ADS CAS Google Scholar - Hobbs, P. V. Ice Physics (Clarendon, Oxford, 1974).
Google Scholar - Squyres, S. W. & Croft, S. K. in Satellites (eds Burns, J. A. & Matthews, M. S.) 293–341 (Univ. Arizona Press, Tucson, 1986).
Google Scholar - Greenberg, R., Geissler, P., Pappalardo, R. & Galileo Imagging Team. Long term and ‘diurnal’ tidal stresses on Europa. Lunar Planet. Sci. Conf. Abstr. 28, 457–458 (1997).
ADS Google Scholar - Geissler, P. E.et al. Evidence for non-synchronous rotation of Europa Nature 391, 368–370 (1998).
Article ADS CAS Google Scholar - Ojakangas, G. W. & Stevenson, D. J. Polar wander of an ice shell on Europa. Icarus 81, 242–270 (1989).
Article ADS CAS Google Scholar - Geissler, P. E., Phillips, C. & Denk, T. in Proc. Workshop on Remote Sensing of Planetary Ices: Earth and Other Solid Bodies 8.5 (1997).
Google Scholar - Pappalardo, R.et al. Deformation and properties of Europa's lithosphere. Eos 78, S203 (1996).
Google Scholar - Williams, K. K.et al. Estimates of ice thickness on Europa. Eos 78, F415–F416 (1997).
Google Scholar - McKinnon, W. B. Convective instabilities in Europa's floating ice shell. Bull. Am. Astron. Soc. 29, 984 (1997).
ADS Google Scholar - Anderson, J. D.et al. Europa's differentiated internal structure: Inferences from two Galileo encounters. Science 276, 1236–1239 (1997).
Article ADS CAS Google Scholar - Durham, W. B., Kirby, S. H. & Stern, L. A. Effects of dispersed particulates on the rheology of water ice at planetary conditions. J. Geophys. Res. 97, 20883–20897 (1992).
Article ADS Google Scholar
Acknowledgements
We thank W. McKinnon and N. Sleep for reviews; N. Sherman, L. Prockter and G. Collins for their contributions; and J. Kaufman, K. Magee and K. Klaasen for their efforts in acquisition of the E6 Europa imaging data. This work was supported by NASA's Galileo Project.
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Authors and Affiliations
- Department of Geological Sciences, Brown University, Providence, 02912-1846, Rhode Island, USA
R. T. Pappalardo, J. W. Head & D. L. Goldsby - Department of Geology, Arizona State University, Tempe, 85287-1404, Arizona, USA
R. Greeley & R. J. Sullivan - National Aeronautics and Space Administration Headquarters, 300 East Street SW, DC 20546, Washington, USA
C. Pilcher - Department of Earth and Space Sciences, Institute of Geophysics and Planetary Physics, University of California Los Angeles, 90095-1567, California, USA
G. Schubert & W. B. Moore - United States Geological Survey, 345 Middlefield Road, Menlo Park, 94025, California, USA
M. H. Carr - National Aeronautics and Space Administration, Ames Research Center, Moffett Field, 94035, California, USA
J. M. Moore - National Optical Astronomy Observatories, Tucson, 85726-6732, Arizona, USA
M. J. S. Belton
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Pappalardo, R., Head, J., Greeley, R. et al. Geological evidence for solid-state convection in Europa's ice shell.Nature 391, 365–368 (1998). https://doi.org/10.1038/34862
- Received: 28 May 1997
- Accepted: 03 November 1997
- Issue Date: 22 January 1998
- DOI: https://doi.org/10.1038/34862
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