Geology and mapping of dark terrain on Ganymede and implications for grooved terrain formation

Details Geology and mapping of dark terrain on Ganymede and implications for grooved terrain formation Geology and mapping of dark terrain on Ganymede and implications for grooved terrain formation

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10522519p&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue E9, p. 22519-22540

Mathematics

Logic

10

Planetology: Solid Surface Planets: Surface Materials And Properties, Planetology: Solid Surface Planets: Tectonics, Planetology: Solid Surface Planets: General Or Miscellaneous, Planetology: Solar System Objects: Jovian Satellites

Scientific paper

Geological mapping of regional and high-resolution Galileo images reveals a variety of units and structures within Ganymede's dark terrain. We have made a detailed study of areas within Galileo, Marius, and Nicholson Regiones in order to investigate the style of tectonic deformation experienced by dark terrain adjacent to swaths of grooved terrain. Dark terrain appears to become fractured as a precursor to grooved terrain formation; in places, dark fractured swaths are recognized which have similar characteristics to brighter grooved terrain swaths. Tectonic deformation may be, but is not always, focused through preexisting weaknesses caused by impact craters and furrows. A prominent groove lane, Anshar Sulcus, is inferred to have formed by the process of hanging wall rollover, accompanied by a small amount of right-lateral horizontal shear offset resulting from NE-SW extension.

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