Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Disharmonic Folds

Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_609

Definition

Folding style where vertically adjacent sediment layers develop different wavelengths and different amplitudes of folds (Price and Cosgrove 1990, p. 304).

Description

Irregular fold pattern: a fold exhibiting sharp changes in wavelength, symmetry, and shape, as compared to adjacent folds (Allaby 2013).

Interpretation

Rootless folds, dome structures, and disharmonic folding in Candor and Melas Chasma (Fig. 1) are interpreted as similar to salt diapirs and salt domes on Earth (Milliken et al. 2007) or, alternatively, as subaqueous mass movement deposits (Weitz et al. 2003).  Honeycomb terrain in Hellas Basin (Fig. 2) is interpreted as a result of salt diapirism, soft sediment deformation, or crustal doming (Mangold and Allemand 2003).
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References

  1. Allaby M (2013) A dictionary of geology and earth sciences, 4th edn. Oxford University Press, Oxford, UK, p 672Google Scholar
  2. Berberian M (1995) Master “blind” thrust faults hidden under the Zagros folds: active basement tectonics and surface morphotectonics. Tectonophysics 241:193–224CrossRefGoogle Scholar
  3. Mangold N, Allemand P (2003) Ductile deformation in hellas floor: salt diapirs or crustal domes? In: The 6th international conference on Mars, Pasadena, Abstract 3047Google Scholar
  4. Milliken RE, Grotzinger J, Beyer RA, Murchie S, McEwen A et al. (2007) Evidence for salt tectonics in Valles Marineris, Mars. In: Seventh international conference on Mars, Pasadena # 3383Google Scholar
  5. Price NJ, Cosgrove JW (1990) Analysis of geological structures. Cambridge University Press, New York, p 502Google Scholar
  6. Weitz CM, TJ Parker, MH Bulmer, FS Anderson, JA Grant (2003) Geology of the Melas Chasma landing site for the Mars Exploration Rover mission. J Geophys Res 108:8082. doi:10.1029/2002JE002022, E12Google Scholar

Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.NASA Ames Research Center/NPPMoffett FieldUSA