HR: 0830h
AN: P41A-0397    [PDF]
TI: Strike-Slip Faulting on Ganymede
AU: * Pappalardo, R T
EM: robert.pappalardo@colorado.edu
AF: LASP, Univeristy of Colorado, Box 392, Boulder, CO 80309 United States
AU: DeRemer, L C
EM: deremer@vgr.colorado.edu
AF: LASP, Univeristy of Colorado, Box 392, Boulder, CO 80309 United States
AB: Galileo spacecraft images of Ganymede have revealed that strike-slip tectonism is common. We recognize three manifestations of strike-slip faulting, in both bright and dark terrains: (1) en echelon structures, (2) strike-slip duplexes, and (3) offset pre-existing features. We infer that en echelon structures link together as the degree of lateral offset increases, and that strike-slip zones in dark terrain may evolve into bright en echelon swaths with increased offset. Mapping of duplexes and duplex-like structures suggests a sequence of events in their progressive development, in which originally discontinuous structures link together and then their interiors imbricate to create mature duplexes; this may be an evolutionary sequence related to the transition from dark to bright grooved terrain. Evidence of offset pre-existing features furthers the case for common strike-slip deformation. In some structurally complex regions, these three elements of strike-slip faulting are all inferred, at various stages. Overall, strike-slip tectonism appears to be an integral part of the grooved terrain formation process, including the transition from dark to bright terrain.
DE: 6218 Jovian satellites
SC: Planetary Sciences [P]
MN: 2003 Fall Meeting