Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.p41a0397p&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #P41A-0397
Physics
6218 Jovian Satellites
Scientific paper
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.
Deremer L. C.
Pappalardo Robert T.
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