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).
Complex folds in Melas Chasma (Milliken et al. 2007, Fig. 2). The folded layers were tilted and subsequently eroded, making the cross section of the structures visible on the surface. Scale bar 1 km. MOC R1103655 (NASA/JPL/Malin Space...
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References
Allaby M (2013) A dictionary of geology and earth sciences, 4th edn. Oxford University Press, Oxford, UK, p 672
Berberian M (1995) Master “blind” thrust faults hidden under the Zagros folds: active basement tectonics and surface morphotectonics. Tectonophysics 241:193–224
Mangold N, Allemand P (2003) Ductile deformation in hellas floor: salt diapirs or crustal domes? In: The 6th international conference on Mars, Pasadena, Abstract 3047
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 # 3383
Price NJ, Cosgrove JW (1990) Analysis of geological structures. Cambridge University Press, New York, p 502
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, E12
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Hargitai, H. (2014). Disharmonic Folds. In: Encyclopedia of Planetary Landforms. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9213-9_609-1
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DOI: https://doi.org/10.1007/978-1-4614-9213-9_609-1
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