HR: 1400h
AN: P33A-03    [Abstracts]
TI: Geological Mapping of Tectonized Terrains in the Trailing Hemisphere of Enceladus
AU: * Crow-Willard, E N
EM: Emma.N.Crow-Willard@jpl.nasa.gov
AF: NASA-Jet Propulsion Lab, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Pappalardo, R T
EM: Robert.Pappalardo@jpl.nasa.gov
AF: NASA-Jet Propulsion Lab, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AB: Saturn's moon Enceladus has a currently active South Polar Terrain (SPT) that is intensely tectonized. Other portions of the surface of Enceladus, specifically the trailing hemisphere, have also been intensely tectonized, inviting comparisons to the SPT. Through geological mapping, we recognize seven different geological units and their relative ages on the trailing hemisphere. From oldest to youngest, they are: (1) heavily cratered terrain, at the northern edge of the tectonized region; (2) moderately cratered terrain, to the northeast and northwest of the tectonized region; (3) finely striated ridge and trough terrain, which make up the bulk of Sarandib and Diyar Planitiae; (4) boundary curved terrain, which is similar in shape to the southern curved terrain that comprises the northern edge of the SPT, but with more subdued topography, and is composed of Samarkand, Hamah, and Harran Sulci; (5) ridged terrain, composed of the Cufa Dorsa and Ebony Dorsum, which probably formed through deformation of older finely striated ridge and trough terrain; (6) terrain with linear, widely spaced, smooth depressions, comprising the southern portion of the trailing hemisphere's tectonized region; (7) southern curved terrain of Cashmere Sulci, which forms the northern boundary of the SPT. Fractures that are younger than or contemporaneous with the SPT's southern curved terrain (including Labtayt Sulci and Khorasan Fossa) cut across the trailing hemisphere. We will present a geological map of the region, along with interpretations of the stratigraphy and geological history that our mapping implies. We will address geological and age comparisons relative to the SPT, with implications for whether similar or different processes have shaped the SPT and the tectonized trailing hemisphere.
DE: 0706 Active layer
DE: 5220 Hydrothermal systems and weathering on other planets
DE: 5475 Tectonics (8149)
DE: 6055 Surfaces
DE: 8015 Local crustal structure
SC: Planetary Sciences [P]
MN: 2009 Joint Assembly