GE 287: Planetary Evolution

24 April 1996

Europa

Pappalardo, R.T. and R.J. Sullivan, Evidence for separation across a gray band on Europa, Icarus, in press, 1996.

The morphology and structure of Thynia Linea suggests a possible resurfacing mechanism for Europa

OBSERVATIONS

Conclusion: No flooded graben, but tensional fractures within the lithosphere, rafted apart

COMPARISON TO OTHER FEATURES

Conclusion: Gray bands and wedge-shaped bands are two manifestations of platelike separation of the europan lithosphere, where 30 km may represent the limit of extension

DISCUSSION

Problem: Where are the partially deformed craters?

Golombek, M.P. and W. Banerdt, Constraints on the subsurface structure of Europa, Icarus, 83, 441-452, 1990.

How can we determine the internal structure of Europa?

Tectonic features can place constraints on the internal structure, temperature gradient and level of differentiation

WEDGE-SHAPED BANDS

MORPHOLOGIC IMPLICATIONS

QUANTITATIVE ASSESSMENT OF TECTONICS & LITHOSPHERIC THICKNESS

QUANTITATIVE ASSESSMENT OF TEMPERATURE GRADIENT

DISCUSSION