Galileo observations of dark terrain on Ganymede - Geological mapping of the Galileo Regio target site

Details Galileo observations of dark terrain on Ganymede - Geological mapping of the Galileo Regio target site Galileo observations of dark terrain on Ganymede - Geological mapping of the Galileo Regio target site

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1145p&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 145.

Mathematics

Logic

Ganymede, Satellite Surfaces, Dark Matter, Terrain Analysis, Galileo Spacecraft, Planetary Geology, Satellite Imagery, Planetary Mapping, Stratigraphy, Planetary Craters

Scientific paper

Voyager data were interpreted to show that dark terrain (which comprises almost half of the satellite) is a nearly primordial impact-generated surface, consisting of furrow sets, impact craters, dark plains and palimpsests. Initial Galileo images of Galileo Regio show a surprisingly heterogeneous terrain. On the basis of albedo and morphological variations we distinguish several units within those units identified from Voyager data, such as: furrow rims; walls and floors; crater rims; floors and ejecta; dark plains; and palimpsests. We find that the furrow and crater units are in agreement with the Voyager interpretations, while the dark plains can be subdivided into at least three units on the basis of albedo. We also find bright material in the form of isolated knobs and massifs, which are not obviously associated with other units. We present a preliminary geological map of the Galileo G1 target area using data from the G1 and G2 orbits (the G2 data provide stereo coverage over approximately one-third of the G1 target site). We have produced a preliminary map on the basis of stratigraphic relationships within the area and we are calibrating this with crater counts.

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