Abstract Old dark terrains on both Ganymede and Callisto were affected by similar endogenic processes, volcanic and (on Ganymede) extensional tectonic modification of multiringed impact structures. The two bodies' evolutions subsequently diverged when younger grooved and light terrains formed only on Ganymede. On the basis of the morphology and geometry of Ganymede's tectonic features, it is inferred that this divergence occurred as the interior of that satellite warmed from an initially cold, undifferentiated state. At least two paradigms of the origin of the divergence are consistent with the interpretations and inferences summarized herein: Ganymede possessed an “accretional trigger” which Callisto did not, or Ganymede's style of mantle convection changed radically as the satellite warmed but Callisto's style of convection did not.
The geologic evolution of Ganymede and its implications for the origin of the Ganymede-Callisto “dichotomy”
Advances in Space Research ; 10 , 1 ; 183-186
1989-01-01
4 pages
Article (Journal)
Electronic Resource
English
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