Formation of bright terrain bands on Ganymede by unstable lithosphere extension

Details Formation of bright terrain bands on Ganymede by unstable lithosphere extension Formation of bright terrain bands on Ganymede by unstable lithosphere extension

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept...30z&link_type=abstract

In NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984 p 30-32 (SEE N85-23474 13-91)

Mathematics

Logic

Brightness, Flyby Missions, Ganymede, Lithosphere, Structural Properties (Geology), Terrain, Voyager Project, Elastic Properties, Interfacial Tension, Space-Time Functions, Stability, Stratigraphy, Tectonics, Topography

Scientific paper

The surface of Ganymede, as seen in Voyager images, was greatly modified by tectonic activity. Geologic evidence is consistent with the formation of younger bright terrain by the emplacement of icy material into rift zones formed in the older dark terrain. To better understand the formation of both terrestrial rift zones and bright terrain bands on Ganymede, the mechanics of rift initiation by the growth of necking instabilities in an extending lithosphere are studied. In particular, how an initial, small perturbation in lithosphere thickness at the lithosphere/asthenosphere boundary is amplified by uniform horizontal extension is studied. The lithosphere is treated as a layer of power-law viscous fluid of thickness H overlying a weaker, viscous mantle substrate. In order to assess the relative importance of buoyant upwelling and mechanical instability in rift formation, both density and strength stratification were incorporated into the model.

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