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On the origins of band topography, Europa

Nimmo, F. and Pappalardo, R. T. and Giese, B. (2003) On the origins of band topography, Europa. Icarus, 166 (1), pp. 21-32. Elsevier. doi: 10.1016/j.icarus.2003.08.002. ISSN 0019-1035.

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We use stereo-derived topography of extensional bands on Europa to show that these features can be elevated by 100–150 m with respect to the surroundings, and that the positive topography sometimes extends beyond the band margins. Lateral variations in shell thickness cannot maintain the observed topography for timescales greater than 0.1 Myr. Lateral density variations can maintain the observed topography indefinitely; mean density contrasts of 5 and 50 kg m-3 are required for shell thicknesses of 20 and 2 km, respectively. Density variations caused by temperature contrasts require either present-day heating or that bands are young features (<1 Myr old). Stratigraphic analyses suggest that these mechanisms are unlikely. The observation that bands form from ridges may be explained by an episode of shear-heating on ridges weakening the ridge area, and leading to strain localization during extension. Fracture porosity is likely to persist over Myr timescales in the top one-third to one-quarter of the conductive part of the ice shell. Lateral variations in this porosity (of order 20%) are the most likely mechanism for producing band topography if the ice shell is thin (approximate2 km); porosity variations of 2% or less are required if the shell is thicker (approximate20 km). If the ice shell is thick, lateral variations in salt content are a more likely mechanism. Warm ice will tend to lose dense, low-melting temperature phases and be buoyant relative to colder, salt-rich ice. Thus, lateral density variations will arise naturally if bands have been the sites of either localized heating or upwelling of warm ice during extension.

Item URL in elib:https://elib.dlr.de/10886/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2003,
Title:On the origins of band topography, Europa
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Nimmo, F.Dept. of Earth Sci., University College London, UKUNSPECIFIEDUNSPECIFIED
Pappalardo, R. T.Lab. for Atm. and Space Physics, Univ. of Colorado, Boulder, USAUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 21-32
Keywords:Satelites of Jupiter, tectonics, ices, geological processes
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Vergleichende Planetologie (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Pieth, Susanne
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 16:26

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